CN108246490A - A kind of high ferrosilite chromium depleted zone stone puies forward Fe and reducing Si beneficiation method - Google Patents
A kind of high ferrosilite chromium depleted zone stone puies forward Fe and reducing Si beneficiation method Download PDFInfo
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- CN108246490A CN108246490A CN201810000670.1A CN201810000670A CN108246490A CN 108246490 A CN108246490 A CN 108246490A CN 201810000670 A CN201810000670 A CN 201810000670A CN 108246490 A CN108246490 A CN 108246490A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 22
- 239000011651 chromium Substances 0.000 title claims abstract description 22
- 239000004575 stone Substances 0.000 title claims abstract description 21
- 229910052635 ferrosilite Inorganic materials 0.000 title claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 104
- 238000007885 magnetic separation Methods 0.000 claims abstract description 57
- 239000012141 concentrate Substances 0.000 claims abstract description 51
- 229910052742 iron Inorganic materials 0.000 claims abstract description 44
- 238000012216 screening Methods 0.000 claims abstract description 34
- 239000011435 rock Substances 0.000 claims abstract description 15
- 238000000227 grinding Methods 0.000 claims description 23
- 238000003860 storage Methods 0.000 claims description 19
- 238000000926 separation method Methods 0.000 claims description 17
- 239000006148 magnetic separator Substances 0.000 claims description 16
- 230000002411 adverse Effects 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 9
- 238000005065 mining Methods 0.000 claims description 7
- 239000004035 construction material Substances 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 5
- 230000005389 magnetism Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 3
- 238000004094 preconcentration Methods 0.000 claims description 3
- 235000019580 granularity Nutrition 0.000 claims 5
- 239000011148 porous material Substances 0.000 claims 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 9
- 238000012545 processing Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000000428 dust Substances 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 17
- 229910052500 inorganic mineral Inorganic materials 0.000 description 17
- 239000011707 mineral Substances 0.000 description 17
- 230000008569 process Effects 0.000 description 10
- 239000010453 quartz Substances 0.000 description 9
- 235000012239 silicon dioxide Nutrition 0.000 description 9
- 238000012546 transfer Methods 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 5
- 239000002223 garnet Substances 0.000 description 4
- WMSLVFFFKYWWSG-UHFFFAOYSA-N iron silicic acid Chemical compound [Fe].O[Si](O)(O)O WMSLVFFFKYWWSG-UHFFFAOYSA-N 0.000 description 4
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 4
- 238000003801 milling Methods 0.000 description 4
- 229910052611 pyroxene Inorganic materials 0.000 description 4
- 230000008719 thickening Effects 0.000 description 4
- 230000032258 transport Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000000498 ball milling Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052626 biotite Inorganic materials 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 3
- 239000011028 pyrite Substances 0.000 description 3
- 229910052683 pyrite Inorganic materials 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910021532 Calcite Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910052595 hematite Inorganic materials 0.000 description 2
- 239000011019 hematite Substances 0.000 description 2
- 229910052892 hornblende Inorganic materials 0.000 description 2
- YPJCVYYCWSFGRM-UHFFFAOYSA-H iron(3+);tricarbonate Chemical compound [Fe+3].[Fe+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O YPJCVYYCWSFGRM-UHFFFAOYSA-H 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 150000004760 silicates Chemical class 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 229910052833 almandine Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052612 amphibole Inorganic materials 0.000 description 1
- 229910052586 apatite Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- -1 hypersthene Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
- 229910052655 plagioclase feldspar Inorganic materials 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000010333 wet classification Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Fe and reducing Si beneficiation method is put forward the invention discloses a kind of high ferrosilite chromium depleted zone stone, using broken-screening, fine crushing, dry type tailings discarding by preconcentration-high pressure roller mill, magnetic cobbing, magnetic cobbing concentrate corase grinding-low intensity magnetic separation flow, coarse crushing is located in the ground, in, fine crushing be set on ground, it is rationally distributed, orderly, floor space is advantageously reduced, and is convenient for ore from underground transportation, promoted；Centering is broken, it is fine crushing after sieve under, oversize carries out dry type and throws tail in advance, it dishes out mixed barren rock, it not only dishes out and has recycled the thick tailing as building material product, block tailing in advance, restore and improve the Iron grade of follow-up sorting operation, greatly reduce the ore amount for feeding subsequent job, it is truly realized " early receipts can be received, early lose can be lost "；High pressure roller mill feeding granularity is up to 30mm, has broken previous precedent, the characteristics of having given full play to high-pressure roller mill low energy consumption, processing capacity is big, does not set product ore deposit heap in design, reduces floor space and dust pollution.
Description
Technical field
The invention belongs to iron ore dressing technical fields, and in particular to a kind of beneficiation method of magnetic iron ore, it is particularly suitable
Silicic acid iron content >=6% that produces in underground mine, country rock incorporation rate are in 8~15%, Iron grade in 28~32% ranges
The energy saving ore dressing of chromium depleted zone stone.
Background technology
China's iron ore is mainly characterized by " poor ", " thin ", " miscellaneous ", average Iron grade 32%, lower than world average grade
11 percentage points.Wherein 97% iron ore needs ore dressing to handle, and the ratio that the hematite of complicated difficult choosing accounts for is big, accounts for about iron
The 20.8% of ore reserve.
Chromium depleted zone stone has the characteristics that Beneficiation Feed Grade is low, ratio of concentration is big, relatively difficult tribulation is selected, resource utilization is low, adds
Upper ore is inevitably mixed into a certain number of country rocks and horsestone, particularly underground mining in recovery process, and country rock is mixed into
Rate is typically up to 10%~20%, so as to reduce milling ore grade.According to traditional ore-dressing technique, whole ore-rocks are into selected
The processing of ore deposit main flow, ton concentrate ore dressing processing charges are very high.The beneficiation cost of chromium depleted zone how is reduced, preferably adapts to market
Price fluctuation is the key that in bargh's production and operation.
Magnetite beneficiation process is mainly made of several processes such as crushing and screening, mill choosing filtering, tailings discharging and stockpilings.It is broken
Broken screening is the preparatory process of ore-dressing practice, and shared beneficiation cost weight is relatively low, and ore grinding and the follow-up expense for sorting process
Proportion is larger in ore dressing processing cost.In order to improve milling ore grade, reduce into ore grinding amount, reduce ore dressing plant energy
Consumption, according to the ore dressing principle of " much broken and lessmill can throw early throwing ".
For this purpose, Chinese patent ZL200910116431.3 discloses " a kind of pre-selection method of low-ore grade magnetic iron ore ", magnetic
Raw iron ores are transported to ultrafine grinding operation after carse, medium and small broken operation crushes, and after high-pressure roller mill crushes, crush product
Wet drum sieve is fed to break up；The upper part of drum sieve sieve carries out wet classification by Belt Conveying to vibrating screen；Vibration Screen top
Divide by Belt Conveying to dry-type magnetic extractor throw and give up, the concentrate of dry-type magnetic extractor returns to high-pressure roller mill and crushed again；It shakes
Dynamic sieve lower part of screen point, drum sieve lower part of screen are given carries out magnetic separation throwing tail into wet type coarse grain midfield intensity magnetic separator；Midfield intensity magnetic separator
Rough concentrate feed mill technique selected to be sorted.The present invention has to be dished out a large amount of qualified tailings before ore grinding by wet magnetic separation,
It reduces into mill amount, reduce ore grinding energy consumption, the advantages that system processing power is high.But the patent is to ultrafine grinding operation (high pressure roller mill
Machine crushes) after screening product carry out carry out dry type magnetic separation-midfield high intensity magnetic separation and throw tail, still do not accomplish " can throw morning throw, energy
The energy saving principle of the early receipts of receipts ", and factory is selected to take up a large area.
Invention content
The purpose of the present invention provides a kind of good energy-conserving effect, fits aiming at the above-mentioned problems in the prior art
The wet tailing yield of Ying Xingqiang, particulate is few and the high ferrosilite chromium depleted zone stone of small accommodation area puies forward Fe and reducing Si beneficiation method.
Above-mentioned purpose to realize the present invention, a kind of high ferrosilite chromium depleted zone stone of the present invention put forward Fe and reducing Si beneficiation method
Using following technique, step：
1) it crushes
Underground mining and the chromium depleted zone stone for being mixed into country rock are 300~0mm through jaw crusher coarse crushing to granularity, it
Afterwards by skip bucket from main shaft hooist to skip bucket ore storage bin, workshop fine crushing in being transported to by ribbon conveyer, then in be crushed to 0~75mm；In
Broken product is transported to the distribution ore storage bin of screening workshop through another ribbon conveyer；The jaw crusher is arranged on underground hole
It is indoor；
2) screening, fine crushing, dry type tailings discarding by preconcentration
The middle crushed product of step 1) is fed into screening operation by dosing sealing-tape machine, undersize is obtained, sieves and produce
Product, the screening operation use vibrating screen, and screen size is 29~31mm；
Undersize carries out dry type magnetic separation by the dry-type magnetic extractor that field strength is 25~30KA/m, obtains the lower dry separation concentrate of sieve,
Thick tailing of dishing out is sold as construction material；The lower dry separation concentrate of sieve is transported to transfer station, then led to by transfer station by ribbon conveyer
It crosses ribbon conveyer and is transported to 1# cylinder ore storage bins；The rational field strength of dry-type magnetic extractor is 27~28KA/m, most preferably
27.85kA/m。
Oversize is transported to lump ore dry type magnetic separation workshop by ribbon conveyer, by the dry type magnetic separation that field strength is 26~30KA/m
Machine carries out dry type magnetic separation, obtains the upper dry separation concentrate of sieve, and block tailing of dishing out is sold as construction material；Dry separation concentrate is by belt on sieve
Conveyer is transported to ore pocket fine crushing, then by gyratory crusher it is fine crushing after, be discharged into ribbon conveyer and feed screening operation again and formed
It is closed circuit；
3) high pressure roller mill, magnetic cobbing, magnetic cobbing concentrate corase grinding
Dry separation concentrate feeds sealing-tape machine through heavy-duty plate feeder by 1# cylinders ore storage bin and is transported to height under the sieve that step 2) obtains
Pressure roller grinds workshop, through high-pressure roller mill roll-in is fine crushing, cylinder beater is broken up, then feeds wet screening operation, wet screening
Screen size is 3.1~3.3mm, is preferred with 3.1~3.2mm, preferably 3.15mm；The oversize of wet screening passes through adhesive tape
Machine is concentrated, and 2# cylinder ore storage bins are transported to, then feed sealing-tape machine by heavy-duty plate feeder and be transported in high pressure roller mill workshop by sealing-tape machine
High-pressure roller mill, formed it is closed circuit；
The undersize of wet screening feeds the adverse current type permanent-magnet drum type magnetic separator that field strength is 30~33kA/m and carries out coarse grain
Tail operation is thrown in magnetic separation, obtains magnetic cobbing concentrate, magnetic cobbing tailing of dishing out；Magnetic cobbing tailing passes through classification operation,
Thin tailings is obtained to sell as building sand product, and the wet tailing of particulate of dishing out；Magnetic cobbing concentrate directly flows automatically to dewatering screen
Industry is allocated as, the oversize for being dehydrated screening operation feeds one section of grate ball mill and roughly ground, the ore discharge and dewatering screen of corase grinding
The undersize for being allocated as industry feeds to one section of cyclone group and is classified, and the sand setting of one section of cyclone group returns to corase grinding operation and formed
Closed circuit, the overflow of one section of cyclone group feeds the low intensity magnetic separation flow of hypomere；The adverse current type permanent-magnet drum type magnetic separator it is reasonable
Field strength range is 31~32kA/m, is preferred with 31.83kA/m.
4) low intensity magnetic separation flow
The overflow for one section of cyclone group that step 3) obtains feeds the adverse current type permanent-magnet chamber type that field strength is 14~17kA/m
Weak magnetic separator carries out one section of low intensity magnetic separation, one section of wet tailing of low intensity magnetic separation of dishing out, and one section of weak magnetic concentrate selection of acquisition feeds two sections of eddy flows
Device group is classified, and the sand setting of two sections of cyclone groups feeds secondary grinding operation, and the ore discharge of secondary grinding returns to two sections of eddy flows
Device group forms closed circuit；The overflow of two sections of cyclone groups obtains final weak magnetic separation iron concentrate, divides by two stages of magnetic separation, three stages of magnetic separation
It Pai Chu not the wet tailing of one section of low intensity magnetic separation, two sections of wet tailings of low intensity magnetic separation；Two stages of magnetic separation, three stages of magnetic separation use the integrated permanent magnetism bitubular
Magnetic separator, field strength are 13~15kA/m；The secondary grinding operation is advisable using overflowball mill；The adverse current type of use is forever
The zone of reasonableness of the field strength of magnetic cylinder formula weak magnetic separator is 15~16kA/m, most preferably 15.12kA/m；The permanent magnetism bitubular magnetic separation of use
The reasonable field strength range of machine is 13~14kA/m, most preferably 13.52kA/m.
Classification operation in step 3) is preferred using the group technology of hydrocyclone and linear vibrating screen, described
The screen size of linear vibrating screen is 0.3~0.5mm, is preferred with 0.3~0.35mm.
Described one section of cyclone group control overflow granularity control is advisable in the range of -0.074mm85~100%, with -
The range of 0.074mm90~100% is preferred；Two sections of cyclone groups control overflow granularity is controlled in -0.048mm70~85%
Range is advisable, and is preferred with the range of -0.048mm70~80%.
Compared with prior art, a kind of high ferrosilite chromium depleted zone stone of the present invention carry Fe and reducing Si beneficiation method have it is following
Advantageous effect：
(1) extraction raw ore lumpiness is 0-800mm, using Three stage crushing with single closed circuit stage sieving circuit, finished breaking product granularity
For 30~0mm, reduction ratio is up to 26.67；Coarse crushing is located in the ground, in, fine crushing be set on ground, it is rationally distributed, orderly, favorably
In reduction floor space, and it is convenient for ore from underground transportation, is promoted.
(2) centering it is broken, it is fine crushing after sieve under, oversize carry out dry type throw tail in advance, mixed barren rock of dishing out not only is thrown
Go out and recycled the thick tailing as building material product in advance, block tailing, restore and improve the Iron grade of follow-up sorting operation, and
And the ore amount for feeding subsequent job is greatly reduced, it is truly realized " early receipts can be received, early lose can be lost ".
(3) high pressure roller mill feeding granularity is up to 30mm, has broken previous precedent, has given full play to high-pressure roller mill energy consumption
Low, the characteristics of processing capacity is big.
(4) high pressure roller mill undersize is final muck product, and granularity is 3.15~0mm, and roll-in granularity is smaller, to high pressure
Roller mill undersize carries out wet type magnetic cobbing, and to throw tail effect good, also the control for subsequent mill feed size, enter to grind carrying for grade
Height creates advantage.According to traditional high pressure roller instead of fine crushing, reduction ratio is inadequate, and granularity influences to throw useless effect compared with conference
Rate, and then restrict the treating capacity and concentrate quality of follow-up mill choosing.
(5) technological process that the present invention uses throws useless-high pressure roller for broken (coarse crushing operation is in underground)-screening-pre-selection
Mill-stage grinding-low intensity magnetic separation flow, the ore dressing plant of 5,500,000 tons/year for the treatment of capacities, mill are elected to be industry and are divided into 2 series；Two sections dry
It throws, the design of one section of wet throwing is greatly improved into mill grade, meets the principle of ore dressing " can receive early receipts, can lose early lose ", also body
Reveal the efficient production of " much broken and lessmill " of knowing clearly, do not set product ore deposit heap in design, not only reduce floor space, but also reduce dust
Pollution.
Description of the drawings
Fig. 1 carries Fe and reducing Si beneficiation method process flow chart for a kind of high ferrosilite chromium depleted zone stone of the present invention.
Specific embodiment
For the description present invention, iron is carried to a kind of high ferrosilite chromium depleted zone stone of the present invention with reference to the accompanying drawings and examples
Drop silicon beneficiation method is described in further details.
A kind of high ferrosilite chromium depleted zone stone of the present invention puies forward Fe and reducing Si beneficiation method in Anhui Ma Gang Zhang village mining industry
Co., Ltd's practical application.
Mine uses underground mining, mixes and carries using ore-rock, if producing 5000000 t of iron ore per year, produces grade 31.27%,
Produce 800~0mm of lumpiness；It is mixed simultaneously to put forward 500,000 t of country rock, country rock grade 15.14%.Coarse crushing equipment uses jaw crusher,
Underground is located at, raw ore granularity after coarse crushing is 300~0mm, by main shaft skip hoisting to skip bucket ore storage bin, then uses belt conveying
Machine is transported to workshop fine crushing in ore dressing plant.Main shaft skip bucket ore storage bin dischargeable capacity is 1180m3, about 2.88 hours ore deposit amounts can be stored.Mine
365 days working times of year, daily 3 classes, per tour 8 hours, underground coarse crushing and ore lifting system equipment operation time are year work
Work 330 days, daily 3 classes, per tour 6 hours.
Main valuable mineral is magnetic iron ore in ore, and content 25.54% separately has a small amount of bloodstone, martite；It is main
Gangue mineral is wanted as quartz, secondly content 35.77% is the silicates mineral such as pyroxene, garnet, total amount 30.74%.
It is divided by ore natural type：
(1) quartz type magnetic iron ore：Major metal mineral are magnetic iron ore；Gangue mineral is based on quartz, wherein between once in a while
The granular pyroxene of miscellaneous embedding cloth, garnet etc..
(2) quartz~pyroxene type magnetic iron ore：Major metal mineral are magnetic iron ore, a small amount of pyrite etc..Main gangue ore deposit
Object is quartz, and secondary gangue is pyroxene, separately containing the silicates ore such as a small amount of hornblend.
(3) garnet, biotite, quartzy hybrid magnetic iron ore：Major metal mineral are magnetic iron ore, and main gangue mineral is
Secondly garnet is quartz, biotite.
(4) quartz, amphibole type hematite：Major metal mineral are martite, separately there is a small amount of half illusion ore deposit.Mainly
Gangue mineral is quartz and hornblende.
1) raw ore chemical composition
Experiment raw ore chemistry multielement, Fe clusters analysis result are shown in Table 1,2.
Raw ore chemistry multielement analysis table 1
| Element | TFe | SFe | FeO | S | P |
| Content (%) | 29.59 | 24.39 | 16.28 | 0.32 | 0.094 |
| Element | CaO | MgO | SiO2 | Al2O3 | Burning subtracts |
| Content (%) | 3.57 | 3.17 | 49.93 | 3.31 | 0.37 |
Raw ore Fe clusters analytical table 2
| Mineral name | Content (%) | Ratio (%) |
| Magnetic iron ore | 18.28 | 61.78 |
| Martite | 2.01 | 6.79 |
| Hematite-limonite | 1.77 | 5.98 |
| Ferric carbonate | 0.83 | 2.80 |
| Ferrosilite | 6.42 | 21.70 |
| Pyrite | 0.28 | 0.95 |
| It is total | 29.59 | 100.00 |
Find out from table 1, table 2, ore is mainly based on magnetic iron ore, Armco magnetic iron distributive law 68.57%, silicic acid iron content compared with
Height accounts for the 21.70% of full iron, according to《Iron, manganese, chrome ore geological exploration norm》(DZ/T0200-2002), ferrosilite in ore
(siFe), when the mass fraction of iron sulfide (sfFe) and ferric carbonate (cFe) is more than the sum of 3% or three more than 3%, Armco magnetic iron
Occupation rate be：ω (mFe)/ω (Tfe-siFe-sfFe-cFe)=91.98%>85%.
2) mineral composition of raw ore
Metalliferous mineral：Magnetic iron ore, martite, bloodstone, limonite, ilmenite, pyrite, magnetic iron ore, brass
Ore deposit.
Gangue mineral：Quartz, hypersthene, biotite, hornblende, almandine, plagioclase, clay, carbonate
(calcite, ferroan calcite), apatite.
3) ore mineral content
The content of each mineral is listed in table 3.
Mineral content table table 3
Therefore, iron ore concentrate Iron grade how is improved in ore dressing, improves magnetic iron recovery, reduces titanium dioxide in iron ore concentrate
If silicone content by the Design of beneficiation process of existing silicic acid iron ore, crushes and three sections of broken two sections of throwings tails is selected when throwing useless system
Traditional dry separation craft be put into mill and select system, it is simple that this throws tail process, it is impossible to carry out fully dissociating and throwing tail.It can cause in this way
Ore enters to grind that grade is low, and granularity is big, and the later stage when carrying out mill and selecting, restricts Ball mill throughput, increase mill choosing time and
Power consumption, increases beneficiation cost, and the rate of recovery of silicic acid iron ore, 65% or so, concentrate grade can only achieve 65% left side
The right side, concentration ratio is also low, and the content height of ferrosilite also results in final concentrate impurity silicone content height in raw ore.
Fe and reducing Si beneficiation method technological process is proposed with reference to a kind of high ferrosilite chromium depleted zone stone of the present invention shown in FIG. 1
Figure, a kind of high ferrosilite chromium depleted zone stone of the present invention put forward Fe and reducing Si beneficiation method concrete technology in practical applications, step
For：
1) it crushes
Underground mining and the chromium depleted zone stone for being mixed into country rock are through jaw crusher coarse crushing to granularity in the cavern of underground
300~0mm, later by skip bucket from main shaft hooist to skip bucket ore storage bin, workshop fine crushing in being transported to by ribbon conveyer, then in be crushed to
0~75mm；In crush product through another ribbon conveyer be transported to screening workshop distribution ore storage bin；
2) screening, fine crushing, dry type tailings discarding by preconcentration
The middle crushed product of step 1) is fed into screening operation by dosing sealing-tape machine, undersize is obtained, sieves and produce
Product, the screening operation use vibrating screen, screen size 30mm；
Undersize carries out dry type magnetic separation by the dry-type magnetic extractor that field strength is 27.85KA/m, obtains the lower dry separation concentrate of sieve, throws
Go out thick tailing and transfer station be transported to, then be transported to thick tailings stack by ribbon conveyer by the transfer station by ribbon conveyer,
Thick tailing is sold as construction material；The lower dry separation concentrate of sieve is transported to another transfer station, then by the transfer station by ribbon conveyer
1# cylinder ore storage bins are transported to by ribbon conveyer；
Oversize is transported to lump ore dry type magnetic separation workshop by ribbon conveyer, by the dry type magnetic separation that field strength is 27.85KA/m
Machine carries out dry type magnetic separation, obtains the upper dry separation concentrate of sieve, and block tailing of dishing out is transported to transfer station transhipment, then have band via ribbon conveyer
Formula conveyer transports to block tailings stack, and block tailing is sold as construction material；Dry separation concentrate is transported to carefully by ribbon conveyer on sieve
Broken ore pocket, then by gyratory crusher it is fine crushing after, be discharged into ribbon conveyer feed again screening operation formed it is closed circuit；
3) high pressure roller mill, magnetic cobbing, magnetic cobbing concentrate corase grinding
Dry separation concentrate feeds sealing-tape machine through heavy-duty plate feeder by 1# cylinders ore storage bin and is transported to height under the sieve that step 2) obtains
Pressure roller grinds workshop, and after high-pressure roller mill roll-in is fine crushing, product is transported to transfer station by sealing-tape machine and transports, then is transported to by sealing-tape machine
Main building is distributed to ball milling fine ore bin；The material of ball milling fine ore bin feeds cylinder beater by frequency conversion feed sealing-tape machine and breaks up, then
Wet screening operation is fed, the screen size of wet screening is 3.15mm；The oversize of wet screening is concentrated by sealing-tape machine,
2# cylinder ore storage bins are transported to by sealing-tape machine, then the high pressure roller that sealing-tape machine is transported in high pressure roller mill workshop is fed by heavy-duty plate feeder
Grinding machine is formed closed circuit；
The undersize of wet screening feeds the adverse current type permanent-magnet drum type magnetic separator that field strength is 31.83kA/m and carries out coarse grain magnetic
Tail operation is thrown in choosing, obtains magnetic cobbing concentrate, magnetic cobbing tailing of dishing out；Magnetic cobbing tailing passes through hydrocyclone and straight line
The composition classification operation of vibrating screen, the thin tailings of oversize transport to transfer station, then transported to by sealing-tape machine by sealing-tape machine concentration
Stockyard is stacked, and thin tailings is sold as building sand product, hydrocyclone overflow and undersize as the wet tailing of particulate oneself
It flows in 50 meters of Tailing thickening machines of Φ；Magnetic cobbing concentrate directly flows automatically to dewatering screen and is allocated as industry, and dehydration screening operation is using single
Layer linear vibrating screen, oversize are concentrated via sealing-tape machine, are transported through sealing-tape machine, are fed one section of grate ball mill and are carried out slightly
Mill, that roughly grinds that ore discharge and undersize flow automatically to one section of cyclone group gives ore deposit pump pond, and one section of cyclone group is transported to through Pulp pump
It is classified, the sand setting of one section of cyclone group flows automatically to one section of grate ball mill and forms closed circuit, the overflow of one section of cyclone group
Feed the low intensity magnetic separation flow of hypomere.The overflow Control granularity of one section of cyclone group is 0-0.074mm (- 200 mesh).
4) low intensity magnetic separation flow
It is weak that the overflow for one section of cyclone group that step 3) obtains flows automatically to the adverse current type permanent-magnet chamber type that field strength is 15.12kA/m
Magnetic separator carries out one section of low intensity magnetic separation, one section of wet tailing of low intensity magnetic separation of dishing out, and one section of weak magnetic concentrate selection gravity flow of acquisition enters two sections of rotations
It flows device group and pumps pond to ore deposit, two sections of cyclone groups are delivered to by Pulp pump and are classified；The sand setting gravity flow of two sections of cyclone groups is fed
Secondary grinding operation, what the ore discharge gravity flow of secondary grinding entered two sections of hydrocyclone groups gives ore deposit pump pond, is returned to by Pulp pump
Two sections of cyclone groups form closed circuit；The overflow of two sections of cyclone groups obtains final weak magnetic separation iron by two stages of magnetic separation, three stages of magnetic separation
Concentrate discharges the wet tailing of one section of low intensity magnetic separation, two sections of wet tailings of low intensity magnetic separation respectively；Two stages of magnetic separation, three stages of magnetic separation are using integrated
Permanent magnetism bitubular magnetic separator, field strength 3.52kA/m；The secondary grinding operation uses overflowball mill.One section, two sections, three
Stages of magnetic separation tailing is flowed automatically in 50 meters of Tailing thickening machines of Φ.Described two sections of cyclone groups control overflow granularity control-
The range of 0.048mm70~80%.
Final weak magnetic separation iron concentrate, which is raised to send to concentrate by Pulp pump, filters workshop, by field strength
The half adverse current type permanent-magnet drum type magnetic separator of 23.87kA/m carries out thickening, and final weak magnetic separation iron concentrate warp is complete certainly
Dynamic ceramic filter filtering, concentrate filter cake enter concentrate store, by grab bucket dress automobile outward transport；Magnetic tailing is concentrated through tailing chute collection
In, into tailings pump pond, Tailing thickening machine is transported to by Pulp pump, filter overflow, which flows automatically to pump pond, is raised by Pulp pump and send to dense
Contracting magnetic separator, filter filtrate flow automatically to ore dressing plant return water system；The total tailing of main building flows automatically to a high-efficiency concentrator and carries out
Concentration, all tailing underflows after concentration are sent by Sending tailings to the processing of tailing filling system.
The rear specific workshop arrangement benefit analysis of design of new processes optimization：
Workshop facilities at present, the product of Zhang village iron ore is single iron ore concentrate, and entire ore dressing plant is arranged in the west of main shaft
Southern side, the west side of 105 national highways is compact-sized, and ore dressing plant is substantially that level land is founded the factory.In view of surrounding enviroment, production is not set in design
Product ore deposit heap, not only reduces floor space, but also reduce dust pollution.The balance of system production is adopted, selected to adjust, and is removed and is adopted in design
Outside the skip bucket ore storage bin of ore deposit setting, centering is fine crushing, sieves, is provided with ore storage bin before high pressure roller mill and ball milling.Undersize directly exists
It sieves workshop and carries out dry type magnetic separation throwing tail, fine ore dry separation ore deposit workshop is separately provided.Filtering workshop divides multi-layer configuration, will concentrate magnetic separation
Upper strata is arranged on, filter plant is in auxiliary equipment such as middle level, vacuum pumps in lower floor, and ore pulp pipeline connects simplicity, and pipeline is short.Concentrate
Storehouse is located in workshop, and automobile shipment concentrate is fed with grab bucket (bridge crane).It is 66.00% to determine iron concentrate grade, to entering
Select the raw ore rate of recovery 70.00% or so.
Ore dressing plant Preliminary design products scheme and number quality index are shown in Table 4.
The number quality index table table 4 of ore dressing plant products scheme and design
Explanation：5,000,000 tons of milling ore, mixed to carry 500,000 tons of barren rock, barren rock grade 15.14% brings amount of metal into ore
It is 4.84%, therefore is calculated according to ore, the amount of metal into Crushing System of Concentrator is 104.84%.If according into ore dressing
The amount of metal of factory is 100.00%, and result of calculation is the most rank rear of table.
After being improved according to above-mentioned process optimization, actual production current year can 5,500,000 tons of milling ore (containing barren rock).It is practical raw
Head grade is 29% or so in production, and iron concentrate grade is up to more than 66%, and concentration ratio is up to 2.28, and magnetic iron recovery is up to
98.5%, ferrosilite removal efficiency is up to more than 95%, achieves unexpected technique effect.
At present, since iron ore price significantly drops, lead to the subway mine loss of enterprise of more than 80% country, and
Anhui Ma Gang Zhang village Mining Limited Company can produce nearly 1,800,000 tons, grade every year as a result of beneficiation method of the present invention
Outside up to more than 66% iron ore concentrate, for building block of tailing, thick tailings, thin tailings product nearly 145 of market welcome are also produced
It ten thousand tons, does not lose not only, but also gets a profit more than 100,000,000 yuan every year, achieve unexpected economic effect.
Claims (5)
1. a kind of high ferrosilite chromium depleted zone stone puies forward Fe and reducing Si beneficiation method, it is characterised in that using following technique, step：
1) it crushes
Underground mining and the chromium depleted zone stone for being mixed into country rock are 300~0mm, Zhi Houyou through jaw crusher coarse crushing to granularity
Skip bucket is from main shaft hooist to skip bucket ore storage bin, workshop fine crushing in being transported to by ribbon conveyer, then in be crushed to 0~75mm；In crush
Product through another ribbon conveyer be transported to screening workshop distribution ore storage bin；The jaw crusher is arranged on underground cavern
It is interior；
2) screening, fine crushing, dry type tailings discarding by preconcentration
The middle crushed product of step 1) is fed into screening operation by dosing sealing-tape machine, obtains undersize, oversize, institute
Screening operation is stated using vibrating screen, screen size is 29~31mm；
Undersize carries out dry type magnetic separation by the dry-type magnetic extractor that field strength is 25~30KA/m, obtains the lower dry separation concentrate of sieve, dishes out
Thick tailing is sold as construction material, is sieved lower dry separation concentrate and is transported to 1# cylinder ore storage bins by ribbon conveyer；
Oversize is transported to lump ore dry type magnetic separation workshop by ribbon conveyer, by field strength be 26~30KA/m dry-type magnetic extractor into
Row dry type magnetic separation, obtains the upper dry separation concentrate of sieve, and block tailing of dishing out is sold as construction material；Dry separation concentrate is by belt conveying on sieve
Machine is transported to ore pocket fine crushing, then by gyratory crusher it is fine crushing after, be discharged into ribbon conveyer feed again screening operation formed it is closed circuit；
3) high pressure roller mill, magnetic cobbing, magnetic cobbing concentrate corase grinding
Dry separation concentrate feeds sealing-tape machine through heavy-duty plate feeder by 1# cylinders ore storage bin and is transported to high pressure roller under the sieve that step 2) obtains
Workshop is ground, through high-pressure roller mill roll-in is fine crushing, cylinder beater is broken up, then feeds wet screening operation, the sieve pore of wet screening
Size is 3.1~3.3mm；The oversize of wet screening is concentrated by sealing-tape machine, and 2# cylinder ore storage bins are transported to by sealing-tape machine, then by
Heavy-duty plate feeder feeds the high-pressure roller mill that sealing-tape machine is transported in high pressure roller mill workshop, is formed closed circuit；
The undersize of wet screening feeds the adverse current type permanent-magnet drum type magnetic separator that field strength is 30~33kA/m and carries out magnetic cobbing
Tail operation is thrown, obtains magnetic cobbing concentrate, magnetic cobbing tailing of dishing out；Magnetic cobbing tailing passes through classification operation, obtains
Thin tailings is sold, and the wet tailing of particulate of dishing out as building sand product；Magnetic cobbing concentrate directly flows automatically to dewatering screen and is allocated as
Industry, the oversize for being dehydrated screening operation feed one section of grate ball mill and are roughly ground, and the ore discharge and dewatering screen of corase grinding are allocated as
The undersize of industry feeds to one section of cyclone group and is classified, and the sand setting of one section of cyclone group returns to corase grinding operation formation and closes
Road, the overflow of one section of cyclone group feed the low intensity magnetic separation flow of hypomere；
4) low intensity magnetic separation flow
The overflow for one section of cyclone group that step 3) obtains feeds the adverse current type permanent-magnet chamber type weak magnetic that field strength is 14~17kA/m
Machine is selected to carry out one section of low intensity magnetic separation, one section of wet tailing of low intensity magnetic separation of dishing out, one section of weak magnetic concentrate selection of acquisition feeds two sections of cyclone groups
It is classified, the sand setting of two sections of cyclone groups feeds secondary grinding operation, and the ore discharge of secondary grinding returns to two sections of cyclone groups
It is formed closed circuit；The overflow of two sections of cyclone groups obtains final weak magnetic separation iron concentrate, arranges respectively by two stages of magnetic separation, three stages of magnetic separation
Go out the wet tailing of one section of low intensity magnetic separation, two sections of wet tailings of low intensity magnetic separation；Two stages of magnetic separation, three stages of magnetic separation use integrated permanent magnetism bitubular magnetic separation
Machine, field strength are 13~15kA/m.
2. a kind of high ferrosilite chromium depleted zone stone as described in claim 1 puies forward Fe and reducing Si beneficiation method, it is characterised in that：
Classification operation in step 3) is using hydrocyclone and the group technology of linear vibrating screen, the sieve of the linear vibrating screen
Pore size is 0.3~0.5mm.
3. a kind of high ferrosilite chromium depleted zone stone as claimed in claim 1 or 2 puies forward Fe and reducing Si beneficiation method, feature exists
In：Secondary grinding operation in step 4) uses overflowball mill.
4. a kind of high ferrosilite chromium depleted zone stone as claimed in claim 3 puies forward Fe and reducing Si beneficiation method, it is characterised in that：One
Section cyclone group control overflow granularity is -0.074mm85~100%, two sections of cyclone groups control overflow granularities for -
0.048mm70~85%.
5. a kind of high ferrosilite chromium depleted zone stone as described in claim 1 puies forward Fe and reducing Si beneficiation method, it is characterised in that：
Classification operation in step 3) is using hydrocyclone and the group technology of linear vibrating screen, the sieve of the linear vibrating screen
Pore size is 0.3~0.35mm；One section of cyclone group controls overflow granularity as -0.074mm90~100% in step 4), two sections
Cyclone group control overflow granularity is -0.048mm70~80%；The field strength of dry-type magnetic extractor in step 2) is 27~28KA/
M, magnetic cobbing throws the field strength of adverse current type permanent-magnet drum type magnetic separator that tail operation uses as 31~32kA/m in step 3)；Step 4)
The middle field strength of adverse current type permanent-magnet chamber type weak magnetic separator used for 15~16kA/m, the field strength of permanent magnetism bitubular magnetic separator for 13~
14kA/m。
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