CN106391298A - Closed circuit ore grinding classification method - Google Patents
Closed circuit ore grinding classification method Download PDFInfo
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- CN106391298A CN106391298A CN201610831145.5A CN201610831145A CN106391298A CN 106391298 A CN106391298 A CN 106391298A CN 201610831145 A CN201610831145 A CN 201610831145A CN 106391298 A CN106391298 A CN 106391298A
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- sand return
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- 238000000227 grinding Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000004576 sand Substances 0.000 claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 238000012216 screening Methods 0.000 claims description 31
- 230000005484 gravity Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 17
- 239000011707 mineral Substances 0.000 abstract description 17
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000011362 coarse particle Substances 0.000 abstract 4
- 239000010419 fine particle Substances 0.000 abstract 3
- 238000007873 sieving Methods 0.000 abstract 1
- 238000003801 milling Methods 0.000 description 8
- 238000010334 sieve classification Methods 0.000 description 6
- 235000019580 granularity Nutrition 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000010298 pulverizing process Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 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
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- 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
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/48—Washing granular, powdered or lumpy materials; Wet separating by mechanical classifiers
- B03B5/52—Spiral classifiers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention discloses a closed circuit ore grinding classification method and belongs to the field of mineral resource exploitation. The method comprises the steps of feeding a qualified ore grinding raw material into ore grinding equipment, and carrying out ore grinding to produce ore pulp; feeding the produced ore pulp into a spiral classifier, and treating by using the spiral classifier to produce fine particle overflow and coarse particle sand return; enabling the produced overflow to directly enter subsequent production, feeding the produced coarse particle sand return into sieving equipment to sieve and classify to produce undersize fine particles and oversize coarse particles; and enabling the undersize fine particles and the produced overflow to simultaneously enter subsequent production, and returning the oversize coarse particles serving as final sand return to a grinding machine to regrind. The method disclosed by the invention is easily realized on the existing basis, is economic and reasonable in technology and has the characteristics of simple process and high benefit.
Description
Technical field
The present invention relates to exploitation of mineral resources field, particularly a kind of closed circuit grinding classification method.
Background technology
Grind grading process is one of important production process in ore dressing plant, and the production efficiency in ore dressing plant is limited by ore grinding workshop section
System, its energy consumption accounts for the 40%～60% of whole ore dressing process, and it plays a part to form a connecting link it is often more important that its reasonability and steady
The qualitative quality being directly connected to subsequent handling whether stable operation and its sorting index.The Technological Economy weighing grind grading refers to
Mark mainly has two aspects：One is the disposal ability of grinding-classification operation, and the overall throughput in ore dressing plant is generally by grind grading
Workshop section controls, and big grind grading disposal ability is undoubtedly conducive to selecting the raising of factory's economic indicator；Two is that grind grading workshop section produces
The quality of product, preferable ore milling product is good and overground phenomenon does not occur for degree of dissociation of mineral monomer.The monomer dissociation of ore milling product
The parameters such as degree, size distribution to follow-up sorting operation impact very big, grinding machine exclusion ore pulp Minerals particle size range width, one
As cannot directly enter and subsequently sort production, need supporting corresponding classifying equipoment to form so-called grinding-classification operation, produce
In should prevent ore particle from crossing the generation of pulverizing as far as possible, ore milling product carries out classification process, and coarse fraction returns grinding machine and regrinds, fine fraction
Enter subsequent production.In production, the classifying equipoment supporting with ore grinding has spiral classifier, sieve classification machine, hydrocyclone.
Spiral classifier is classifying equipoment the most traditional, and its principle is to carry out gravitational settling classification in graded region ore particle, tool
Have the advantages that stable, production capacity is big, sand return automatic lifting, a general grinding machine is equipped with a single-screw or double helix divides
Level machine can meet production requirement, but spiral classifier classification efficiency is low（＜ 40%）, in coarse grain sand return, fine-grained heavy minerals are carried secretly sternly
Weight, returns after grinding machine is regrinded and easily produced pulverizing, deteriorate follow-up sorting, and substantial amounts of sand return governs grind grading work
The raising of section production capacity, so that the technical-economic index of whole factory cannot improve；Hydrocyclone is in centrifugal force and weight
It is classified in power compound force field, classification efficiency is higher（＞ 70%）, in current production especially large-scale select factory application very general
And, but high energy consumption, serious wear in producing, coarse-grained material easily blocks, and spigot cleaning is difficult, and fine-grained heavy minerals are easily pressed from both sides simultaneously
Miscellaneous entrance sand setting, sand setting return grinding machine is regrinded and was easily produced pulverizing, is unfavorable for follow-up sorting operation；Sieve classification is according to ore particle
Physical dimension be classified, fine mineral preferentially enters fine fraction product, can avoid spiral classifier and hydrocyclone
In production, fine-grained heavy minerals enter " heavy mineral returns enrichment phenomenon " of sand setting, mineral can be prevented overground, decreasing sand return amount has
Beneficial to mitigation mill load, but screening machine disposal ability is relatively small, and under big load operation, easily blocking causes screening effect unstable
Fixed, it is rarely employed screening plant in actual production directly supporting with ore grinding.
For improving disposal ability and the product quality of grind grading workshop section, the research work piece for grind grading is unequal to
Lift.Ore milling product is directly carried out regrinding as sand return on sieve classification sieve by ZL201410073761.X, and sieve is lower to enter next work
Section, ore milling product directly is carried out entering spiral classifier classification, screw classifying on sieve classification sieve by ZL201110095733.4
Coarse fodder returns grinding machine and regrinds, and classification efficiency has obtained a certain degree of raising, but screening plant production capacity is less, if selecting factory complete
The ore pulp in portion all needs through screening process, then need the screening plant that number of matches is more or large-scale, and floor space is big, and large-scale
Screening plant short life, remains in some problems in manufacturing process and manufacture means, and therefore, sieve classification is unfavorable for selecting factory to give birth to
The raising of production capacity power.ZL201410013253.2 directly coordinates ball mill using hydrocyclone, and ZL201310010477.3 will
Sieve after ore milling product sieve classification lower feed hydrocyclone, meet, improve classification efficiency to reduce hydrocyclone, but reflecting
Problem in aspects such as equipment production stability, production cost, disposal abilities is not widely applied.
Content of the invention
It is an object of the invention to provide a kind of closed circuit grinding classification method, specifically include following steps：
（1）Qualified ore grinding raw material is fed grinding attachment, output ore pulp after processing through ore grinding；
（2）By step（1）The ore pulp producing feeds spiral classifier, output overflow and sand return after processing through spiral classifier（Spiral shell
Rotation grader classification efficiency is not high, still contains the qualified particulate of many granularities in sand return）；
（3）By step（2）The overflow producing feeds subsequent production, by step（2）The sand return producing feeds screening plant and is sieved
Classification, particulate and sieve above coarse grain under the qualified sieve of output after screened classification；
（4）By step（3）Sieve under particulate together with step（2）The overflow of output feeds subsequent production together, by step（3）Sieve
Upper coarse grain returns grinding machine and regrinds.
Preferably, step of the present invention（3）Described in screening plant feed port height be less than step（2）Described in
Spiral classifier sand return discharge gate, make aborning spiral classifier sand return gravity flow enter screening plant.
Preferably, step of the present invention（3）Described in the sieve of screening plant on coarse grain grinding machine is returned by belt-conveying.
Preferably, step of the present invention（3）Described in the screening plant course of work in add water shower.
Preferably, step of the present invention（3）Described in screening plant be vibratory sieve, screen-aperture be 0.05 ~ 4mm, vibration
Frequency is 1000 ~ 4000 beats/min.
Preferably, step of the present invention（3）Described in screening plant quantity according to produce needs configured, can be by one
Or multiple stage sieve composition, can be multi-deck screen can also be single-deck screen.
Beneficial effects of the present invention：
（1）The problem of spiral classifier sand return entrained fines heavy mineral is overcome after the screened classification of sand return of spiral classifier,
The qualified grade of granularity is separated in time, and classification efficiency is greatly improved, and on the one hand avoids fine-grained heavy minerals ore grinding again
Produced pulverizing, deteriorated follow-up sorting operation, the sand return amount on the other hand decreasing entrance grinding machine was conducive to raising ore grinding to divide
The production capacity of level workshop section.
（2）Screening plant compensate for spiral classifier and produces unstable defect, especially changes in original ore property
When increasing as the content than heavy mineral big in ore, in spiral classifier coarse grain sand return fine-grained heavy minerals carry phenomenon secretly will be more prominent
Go out, the classification of mineral physical dimension is pressed in screening, its classification efficiency is not affected the ore milling product it is ensured that stable by ore particle proportion
Quality.
（3）The coarse grain sand return water content that screw classifying produces is low, can be directly entered screening process it is not necessary to concentrating or adding
Water, therefore this technique do not introduce other extra handling process or equipment, and flow process is simple；This technique has also played screw classifying
The sand return of the big advantage of machine disposal ability, only spiral classifier enters screening plant and will not bring excessive work to screening plant
Load.
（4）This technique is easily achieved in existing technology and equipment, and screening plant energy consumption is low, easy to operate,
And hardly increase the production cost selecting factory.
In sum, this methods described carries out composite ratings to ore milling product, reduces the derichment of fine fraction heavy mineral,
Have that equipment is simple and convenient to operate, is easily achieved, classification efficiency is high, production capacity is big, that product quality is high and stable is excellent
Point.
Brief description
Fig. 1 is the process chart of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further detail, but protection scope of the present invention be not limited to described interior
Hold.
Embodiment 1：Yunnan tin ore ore dressing plant is entered with φ 1500 duplex-spiral classifier using φ 2100 × 3000 ore mill
Row closed circuit grinding classification, ore discharge granularity 0.3mm, mog -200 mesh accounts for 60%, and classification efficiency is 46%, -200 mesh folder in sand return
Band about 8%, in sand return, entrained fines lead to classification efficiency low, grinding classification system are carried out using existing equipment using the present invention
Transformation.
Improved grinding grading technique is：Combined by spiral classifier and vibrosieve grader and process grinding machine ore discharge
The ore pulp that grinding machine is discharged is fed spiral classifier by ore pulp first, then feeds the coarse grain sand return that spiral classifier produces
Vibratory sieve, vibratory sieve is placed in spiral classifier side, and its material inlet is less than the gape of spiral classifier sand return, spiral classifier
Sand return feeds vibratory sieve through feed launder gravity flow, and on the sieve that vibratory sieve produces, coarse grain returns grinding machine through belt-conveying and regrinds, and sieve is lower to be produced
Product gravity flow feeds next production process after entering spiral classifier overflow mixing.
Equipment used is made up of spiral classifier and vibrosieve grader, spiral classifier be placed in grinding machine side with former
Produce configuration identical, vibratory sieve is placed in spiral classifier side, vibratory sieve length, width and height a size of 1000 × 750 × 900mm, vibration
The upper sieve of sieve adopts the polyurethane sieve plate that aperture is 5mm, and lower floor adopts the abrasion-proof stainless steel screen cloth that aperture is 0.3mm, shakes
The dynamic frequency is 1600 beats/min.Spiral classifier sand return gape is higher than the material inlet of Vibration Screen, and sand return gravity flow enters vibration
Sieve, on Vibration Screen, discharge gate is configured with belt, and on sieve, coarse grain returns grinding machine by belt-conveying, in the screening plant course of work
Add water shower.
By the present invention to grind grading transformation after and put into production, the qualified grain size in sand return is effectively controlled, and returns
Sand amount reduces, and the overground phenomenon of mineral reduces, and reduces ore grinding energy consumption, increases the disposal ability of grind grading.Classification efficiency is same
Ratio improves about 15 percentage points, and grinding machine equipment hour efficiency improves about 3.5%, and ore grinding power consumption reduces by 3%, and ore grinding cost reduces by 4%, effect
Significantly.
Embodiment 2：Yunnan processes 1500 tons of copper ore dressing factories using φ 2700 × 3600 ore mill and φ 2000 couples one day
Spiral classifier carries out closed circuit grinding classification, ore discharge granularity 0.3mm, and mog -200 mesh accounts for 60%, and classification matter efficiency is 45%,
In sand return, -200 mesh carry about 12% secretly, and in sand return, entrained fines lead to classification efficiency low, the stage division being used and device and reality
Apply example 1 identical.
Vibratory sieve length, width and height a size of 1100 × 800 × 900mm, the upper sieve of vibratory sieve adopts the poly- ammonia that aperture is 6mm
Fat sieve plate, lower floor adopts the abrasion-proof stainless steel screen cloth that aperture is 0.35mm, and the vibration frequency is 1500 beats/min.Spiral classifier
Sand return gape is higher than the material inlet of Vibration Screen, and sand return gravity flow enters vibratory sieve, and on Vibration Screen, discharge gate is configured with skin
Band, on sieve, coarse grain returns grinding machine by belt-conveying, and add water in the screening plant course of work shower.
Through selecting the continuous post-installation review of factory and index test, the classification matter efficiency of 0.3mm calculating pressed by screening spiral classifier
Reach 70%, grinding machine equipment hour efficiency improves about 2%, ore grinding power consumption reduces by 3.5%, ore grinding cost reduces by 5%, has reached expected use
Effect.
Embodiment 3：Certain selects factory's designed productive capacity is 1000t/d, ore grinding uses MQG2740 grate ball mill
One, classification adopts FLGT-2000 high weir spiral classifier one, ore discharge granularity 0.3mm, and mog -200 mesh accounts for 60%,
Classification efficiency is 62%, and in sand return, -200 mesh carry about 10% secretly.Grinding classification system is carried out using existing equipment using the present invention
Transformation, the stage division being used and device are same as Example 1.
Vibratory sieve length, width and height a size of 1000 × 750 × 900mm, the upper sieve of vibratory sieve adopts the poly- ammonia that aperture is 4mm
Fat sieve plate, lower floor adopts the abrasion-proof stainless steel screen cloth that aperture is 0.3mm, and the vibration frequency is 1800 beats/min.Spiral classifier returns
Sand gape is higher than the material inlet of Vibration Screen, and sand return gravity flow enters vibratory sieve, and on Vibration Screen, discharge gate is configured with belt,
On sieve, coarse grain returns grinding machine by belt-conveying, and add water in the screening plant course of work shower.
Transformation reprocessing rate increases to l 050t/d by original 900t/d, improves 16%, and classification efficiency is by transforming it
Front 62% brings up to 80%, and sand return is reduced to 70% than by 240% before transforming, and has reached expected using effect.
In a word, the transformation of this grind grading decreases classification sand return to greatest extent and carries qualified products secretly, it is to avoid qualified product
Product return ball mill, can effectively improve classification efficiency and ball mill productivity ratio, create conditions for " energy-saving, cost efficiency ".
Claims (6)
1. a kind of closed circuit grinding classification method is it is characterised in that specifically include following steps：
（1）Qualified ore grinding raw material is fed grinding attachment, output ore pulp after processing through ore grinding；
（2）By step（1）The ore pulp producing feeds spiral classifier, output overflow and sand return after processing through spiral classifier；
（3）By step（2）The overflow producing feeds subsequent production, by step（2）The sand return producing feeds screening plant and is sieved
Classification, particulate and sieve above coarse grain under the qualified sieve of output after screened classification；
（4）By step（3）Sieve under particulate together with step（2）The overflow of output feeds subsequent production together, by step（3）Sieve
Upper coarse grain returns grinding machine and regrinds.
2. closed circuit grinding classification method according to claim 1 it is characterised in that：Step（3）Described in screening plant
Feed port height be less than step（2）Described in spiral classifier sand return discharge gate, make screw classifying aborning
Machine sand return gravity flow enters screening plant.
3. closed circuit grinding classification method according to claim 1 it is characterised in that：Step（3）Described in screening plant
Sieve on coarse grain grinding machine is returned by belt-conveying.
4. closed circuit grinding classification method according to claim 1 it is characterised in that：Step（3）Described in screening plant
Add water in the course of work shower.
5. closed circuit grinding classification method according to claim 1 it is characterised in that：Step（3）Described in screening plant
For vibratory sieve, screen-aperture is 0.05 ~ 4mm, vibration frequency is 1000 ~ 4000 beats/min.
6. closed circuit grinding classification method according to claim 1 it is characterised in that：Step（3）Described in screening plant can
Be made up of one or more sieve, can be multi-deck screen can also be single-deck screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610831145.5A CN106391298A (en) | 2016-09-20 | 2016-09-20 | Closed circuit ore grinding classification method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610831145.5A CN106391298A (en) | 2016-09-20 | 2016-09-20 | Closed circuit ore grinding classification method |
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Family
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109894254A (en) * | 2017-12-11 | 2019-06-18 | 南京梅山冶金发展有限公司 | A method of it is dehydrated for middle fine tailings |
| CN111905917A (en) * | 2020-08-04 | 2020-11-10 | 安徽马钢矿业资源集团姑山矿业有限公司 | System and method for high production efficiency of two-stage grinding of magnetic ore |
| CN112090579A (en) * | 2020-09-16 | 2020-12-18 | 安徽马钢张庄矿业有限责任公司 | Efficient iron concentrate powder sorting process |
| CN113634353A (en) * | 2021-07-31 | 2021-11-12 | 栾川鑫曙博远选矿有限公司 | Ore grinding device with regrinding mechanism |
| CN113908619A (en) * | 2021-09-24 | 2022-01-11 | 清远市博发环保科技有限公司 | Production method and device for preparing liquid environment-friendly alkali from carbide slag |
| CN114405660A (en) * | 2022-01-28 | 2022-04-29 | 江苏金红新材料股份有限公司 | Ore grinding process capable of reducing excessive crushing of product |
| CN114932009A (en) * | 2022-04-26 | 2022-08-23 | 武汉理工大学 | Comprehensive utilization method of low-grade large-scale graphite ore |
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| CN113908619A (en) * | 2021-09-24 | 2022-01-11 | 清远市博发环保科技有限公司 | Production method and device for preparing liquid environment-friendly alkali from carbide slag |
| CN114405660A (en) * | 2022-01-28 | 2022-04-29 | 江苏金红新材料股份有限公司 | Ore grinding process capable of reducing excessive crushing of product |
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Application publication date: 20170215 |