CN103160683A - Roasting pretreatment method of iron ore containing high crystal water - Google Patents
Roasting pretreatment method of iron ore containing high crystal water Download PDFInfo
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- CN103160683A CN103160683A CN2011104185446A CN201110418544A CN103160683A CN 103160683 A CN103160683 A CN 103160683A CN 2011104185446 A CN2011104185446 A CN 2011104185446A CN 201110418544 A CN201110418544 A CN 201110418544A CN 103160683 A CN103160683 A CN 103160683A
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- iron ore
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- high crystal
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 239000013078 crystal Substances 0.000 title claims abstract description 54
- 238000002203 pretreatment Methods 0.000 title claims abstract description 9
- 239000008188 pellet Substances 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 22
- 238000005453 pelletization Methods 0.000 claims description 14
- 238000005245 sintering Methods 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 238000012216 screening Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 2
- 238000007873 sieving Methods 0.000 abstract 2
- 238000004901 spalling Methods 0.000 description 12
- 238000000354 decomposition reaction Methods 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 238000004880 explosion Methods 0.000 description 4
- 125000005587 carbonate group Chemical group 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 150000002505 iron Chemical class 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 206010019332 Heat exhaustion Diseases 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006253 efflorescence Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
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Abstract
The invention provides a roasting pretreatment method of iron ore containing high crystal water, which mainly comprises the following steps: 1) pre-screening: sieving iron ore containing high crystal water, and paving a bottom and side material groove on a conveyor belt type roasting machine with the size larger than 20 mm; 2) laying a bottom and paving edges: before the green pellets are paved, feeding the iron ore containing high crystal water in a material groove for paving the bottom and the edges to a trolley for paving the bottom and the edges; 3) roasting: roasting the bottom edge material and the green pellets on a pellet trolley of a belt type roasting machine; 4) screening: and sieving the roasted massive iron ore and the roasted pellets together, wherein the size of the roasted massive iron ore and the size of the roasted pellets are larger than 9mm, and the size of the roasted massive iron ore and the size of the roasted pellets are directly supplied to a blast furnace for smelting, and the size of the roasted massive iron ore and the size of the roasted pellets are smaller than 9mm and are used. The invention can remove the harmful substances such as crystal water, carbonate and the like in the ore from the iron ore containing high crystal water, improve the metallurgical performance, increase the charging proportion to more than 20 percent, improve the pellet production rate and reduce the production cost.
Description
Technical field
The invention belongs to the technical field of blast furnace ironmaking of ferrous metallurgy, particularly for improving into the stove ratio containing the roasting pretreatment method of high crystal water massive iron ore.
Background technology
Massive iron ore (abbreviation lump ore) is the important iron-bearing material that blast furnace uses, and it has consisted of the iron-containing charge structure of blast furnace together with high basicity sinter and acidic oxidation pellet, for the blast furnace burden reasonableness has been established important basis.
Generally crystal water content is called high crystal water content iron ore greater than 8% natural lump ore.According to traditional BF Burden Materials Preparation theory, should improve as far as possible " the grog rate " of blast furnace feeding iron-bearing material, namely want multiplex agglomerate and pellet.Therefore, domestic blast furnace " grog rate " generally surpasses 85% for a long time, even all uses the blast furnace of agglomerate and pellet quite a few.With respect to " grog " that process through the high temperature agglomeration process---for agglomerate and pellet, directly belong to " raw material " with the normal temperature physical method from mining massive iron ore out.Obviously, slave unit investment, energy consumption and environment protection equal angles are set out, and it is useful that blast furnace directly uses part higher-grade lump ore.On the other hand, on price, imported lump ore is than imported pellet considerably cheaper.Obviously, in the situation that satisfy the blast furnace demand, suitable multiplex lump ore helps the blast furnace reduction of ore deposit cost.Therefore, inquiring into blast furnace lump ore volume operation technique, is the important topic that the ironmaking worker earnestly pays close attention to.
Learn as can be known according to blast furnace ironmaking, the decomposition of iron ore crystal water and the decomposition of carbonate are all thermo-negative reaction, the heat exhaustion that can increase blast-furnace smelting.In addition, the decomposition of crystal water makes ore generate pore, and this can cause the decline of iron ore physical strength and efflorescence, affects the ventilation property of upper blast furnace.The decline degree of physical strength is estimated with iron ore thermal spalling index.Thermal spalling is that the phenomenon of fragmentation occurs due to the effect of thermal stresses in temperature-rise period after adding blast furnace lump ore.
Lump ore thermal spalling behavior can be estimated by measuring its thermal spalling index (DI).Generally speaking, it is higher that lump ore contains crystal water, and the ability of bearing thermal stresses is less, and the tendency that explosion namely occurs because being heated is more serious, and thermal spalling index (DI) is just larger.
Describe the content of crystal water in iron ore on metallurgy with the extent of hydration of lump ore, the content of crystal water and the thermal spalling of lump ore are closely related, and the thermal spalling characteristic is to estimate blast furnace one of index of lump ore self-characteristic.
In addition, the decomposition of carbonate on the one hand can water down Deoxidation Atmosphere in Furnace, decomposes in higher temperature region and also can cause the deteriorated etc. of coke.
The evaporation of furnace charge mechanical water is very little on the impact of blast furnace ironmaking process, and the decomposition of furnace charge crystal water just can be carried out under comparatively high temps due to need, thereby blast-furnace smelting is had a negative impact.
In a word, the mechanism of thermal spalling occurs as can be known according to aforesaid lump ore in blast furnace, the extent of hydration of lump ore has a significant impact for its thermal spalling index, and along with the increase of extent of hydration, the thermal spalling index of lump ore raises.For example: the limonite that extent of hydration is larger---the thermal spalling index of raising the enlightening lump ore is higher.Thermal spalling occurs in, crystal water characteristics of decomposition unconspicuous lump ore hardly very little as for extent of hydration.
The existing pretreatment process that contains high crystal water iron ore is: at the iron ore bedding plant, iron ore is carried out simple sizing, sift out powder less than 8～10mm for sintered material, directly flow to blast furnace greater than the massive iron ore of 8～10mm and smelt.All the time, lump ore is smelted directly into stove with many denouncing, and crystal water content generally is no more than 5% greater than 8% natural lump ore directly into the blast-furnace smelting ratio, and the iron ore lump ore that contains low crystal water (less than 2%) enters the stove ratio and can reach 20%.Therefore, the stove ratio that enters that contains high crystal water iron ore is very limited.
Can infer in conjunction with above understanding: blast furnace is using " raw material "---should weaken as far as possible or avoid the generation of explosion situation during lump ore.Therefore, how entering the stokehold at lump ore removes these and causes the crystal water preconditioning technique of explosion to seem most important to blast-furnace smelting.
Summary of the invention
The object of the invention is to overcome the deficiency that above-mentioned prior art exists, a kind of roasting pretreatment method that contains high crystal water iron ore is provided, contain high crystal water iron ore with solution and enter the restricted problem of stove ratio.
During existing belt type roasting machine explained hereafter pelletizing; belt machine chassis both sides ball layer burns thoroughly and bottom is crossed wet phenomenon and protects chassis sideboard and grid section in order to solve; the extension device life-span; all adopt shop fixtures to spread the limit method; namely on bogie grates and avris first spread the ripe pelletizing of skim finished product (be called for short base material), again carry out roasting together with the green pellets of rear paving.Technical solution of the present invention is mainly to utilize this shop fixtures paving limit technology, the iron ore that will contain high crystal water substitutes the ripe pelletizing of finished product on shop fixtures paving limit, realizes roasting pretreatment to containing high crystal water iron ore.
The roasting pretreatment method that the present invention contains high crystal water iron ore comprises following concrete steps:
(1) pre-screening: the iron ore size composition that has good ventilation property and high crystal water for assurance ball layer is even, at first the iron ore that contains high crystal water is sieved, the screen cloth diameter is 20mm, and the shop fixtures of the massive iron ore that contains high crystal water greater than 20mm that sieves out being delivered on burning machine by haulage system spreads the rim charge groove;
(2) shop fixtures paving limit: by valve, shop fixtures is spread the iron ore that contains high crystal water in the rim charge groove and be given to and carry out shop fixtures paving limit on chassis, the grate-layer material layer thickness is 75～200mm, and paving rim charge layer thickness is 75～120mm, then spreads green pellets;
(3) roasting: be opposite to and contain high crystal water iron ore base material on belt machine pelletizing chassis, carry out roasting together with green pellets, in the pellet roasting process, the base material will experience temperature variation sharply in the short period of time, removing of crystal water can occur in this course, the decomposition of carbonate, the series of physicals such as the explosion of rawore, chemical reaction, thus the performance of lump ore is changed;
(4) screening: the massive iron ore that does not contain high crystal water after calcination process sieves at the roasting tail together with agglomerates, massive iron ore and pelletizing greater than 9mm are directly supplied with blast-furnace smelting, send sintering process to be used as raw materials for sintering less than the powder of 9mm.
Adopt the technology of the present invention, make the iron ore lump ore that contains high crystal water experience the high temperature oxidation roasting of 900～1280 ℃ in the pellet roasting process, the objectionable impuritiess such as crystal water in the ore and carbonate have been removed, improved the metallurgical performance burst index index of iron ore, solved the restriction lump ore and entered the bottleneck of stove ratio, thereby the stove ratio that enters of the iron ore lump ore that contains high crystal water is brought up to more than 20% by 5% left and right in past.Simultaneously, substitute the finished product pellet as the limit bed material with the iron ore that contains high crystal water, make the pellet formation rate increase, the fuel consumption of pelletizing operation reduces, thereby has reduced production cost.
Description of drawings
Accompanying drawing 1 is the schematic diagram on shop fixtures paving of the present invention limit.In figure, 1 is trolley breast plate, and 2 is bogie grates, 3 for as the paving rim charge contain the natural massive iron ore of high crystal water, 4 for as the natural massive iron ore of containing of grate-layer material of high crystal water.
Embodiment
The present invention is further illustrated below by embodiment.
Embodiment 1
The iron ore that contains high crystal water is sieved in advance, and the screen cloth diameter requires greater than green-ball pelletizing diameter, and green-ball pelletizing diameter is generally 16mm, will spread the rim charge groove greater than the shop fixtures that the massive iron ore that contains high crystal water of 20mm is delivered on burning machine.Then be given to by valve and carry out shop fixtures paving limit on chassis, grate-layer material thickness is 80mm, and paving rim charge thickness is 80mm, then spreads green pellets.Carry out again roasting (the sinter process system sees Table 1) together with green pellets.Sieve at the roasting tail at last, will directly supply with blast-furnace smelting greater than massive iron ore and the pelletizing of 9mm, send sintering process to be used as raw materials for sintering less than the powder of 9mm.
Table 1 embodiment 1 sinter process system
The chemical composition of iron ore that embodiment uses sees Table 2.This iron ore is that Australia produces, and its crystal water content is 10.20%.Relatively see Table 3 without calcination process and through lump ore burst index, low temperature reduction degradation index after roasting.
Table 2 embodiment 1 lump ore chemical composition/%
Table 3 embodiment 1 lump ore burst index and low temperature reduction degradation index
The iron ore that contains high crystal water is sieved in advance, and the screen cloth diameter requires greater than green-ball pelletizing diameter, and green-ball pelletizing diameter is generally 16mm, will spread the rim charge groove greater than the shop fixtures that the massive iron ore that contains high crystal water of 20mm is delivered on burning machine.Then be given to by valve and carry out shop fixtures paving limit on chassis, grate-layer material thickness is 180mm, and paving rim charge thickness is 110mm, then spreads green pellets.Carry out again roasting (the sinter process system sees Table 4) together with green pellets.Sieve at the roasting tail at last, will directly supply with blast-furnace smelting greater than massive iron ore and the pelletizing of 9mm, send sintering process to be used as raw materials for sintering less than the powder of 9mm.
Table 4 embodiment 2 sinter process systems
The chemical composition of iron ore that embodiment uses sees Table 5.This iron ore is that Australia produces, and its crystal water content is 8.95%.Relatively see Table 6 without calcination process and through lump ore burst index, low temperature reduction degradation index after roasting.
Table 5 embodiment 2 lump ore chemical composition/%
Table 6 embodiment 2 lump ore burst index and low temperature reduction degradation indexs
From lump ore burst index and the low temperature reduction degradation index detected result that table 3 and table 6 provide, obviously improve through the iron ore metallurgical performance index (burst index and low temperature reduction degradation index) that contains high crystal water of calcination process.
Claims (3)
1. roasting pretreatment method that contains high crystal water iron ore, it is characterized in that comprising the following steps: 1) pre-screening---the iron ore that contains high crystal water is sieved, will spread the rim charge groove greater than the shop fixtures that the massive iron ore of 20mm is delivered on belt type roasting machine through haulage system; 2) shop fixtures paving limit---before the paving green pellets, by valve, shop fixtures is spread the iron ore that contains high crystal water in the rim charge groove and be given to and carry out shop fixtures paving limit on chassis; 3) roasting---the base material that is opposite on belt type roasting machine pelletizing chassis carries out calcination process together with green pellets; 4) screening---the massive iron ore that does not contain high crystal water after calcination process sieves at the roasting tail together with agglomerates, massive iron ore and pelletizing greater than 9mm are directly supplied with blast-furnace smelting, send sintering process to be used as raw materials for sintering less than the powder of 9mm.
2. the roasting pretreatment method that contains high crystal water iron ore according to claim 1, is characterized in that in described iron ore, crystal water quality percentage composition is greater than 8%.
3. the roasting pretreatment method that contains high crystal water iron ore according to claim 1 is characterized in that the grate-layer material layer thickness on described shop fixtures paving limit is 75～200mm, and paving rim charge layer thickness is 75～120mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104185446A CN103160683A (en) | 2011-12-14 | 2011-12-14 | Roasting pretreatment method of iron ore containing high crystal water |
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| CN2011104185446A CN103160683A (en) | 2011-12-14 | 2011-12-14 | Roasting pretreatment method of iron ore containing high crystal water |
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| CN103160683A true CN103160683A (en) | 2013-06-19 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017140861A1 (en) * | 2016-02-19 | 2017-08-24 | Outotec (Finland) Oy | Method and apparatus for charging pallet cars of a traveling grate for the thermal treatment of bulk materials |
| CN109436864A (en) * | 2018-12-12 | 2019-03-08 | 中冶焦耐(大连)工程技术有限公司 | A kind of electric-melting magnesium production furnace vehicle bottom material laying device and method |
| CN112176177A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Pretreatment method of natural lump ore |
| CN112176178A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Method for improving thermal decrepitation of natural block ore |
| CN112176176A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Method for improving reducibility of natural lump ore |
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|---|---|---|---|---|
| US4321085A (en) * | 1979-02-06 | 1982-03-23 | Loussavaara-Kiirunavaara Aktiebolag | Method of sintering pellets |
| SU1482965A1 (en) * | 1987-07-02 | 1989-05-30 | Всесоюзный научно-исследовательский институт металлургической теплотехники | Method of loading pellets onto firing cars of conveyer machines |
| CN1429920A (en) * | 2001-12-31 | 2003-07-16 | 新疆钢铁研究所 | Application of limonite as bedding material in method for producing pellet agglomerate |
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2011
- 2011-12-14 CN CN2011104185446A patent/CN103160683A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4321085A (en) * | 1979-02-06 | 1982-03-23 | Loussavaara-Kiirunavaara Aktiebolag | Method of sintering pellets |
| SU1482965A1 (en) * | 1987-07-02 | 1989-05-30 | Всесоюзный научно-исследовательский институт металлургической теплотехники | Method of loading pellets onto firing cars of conveyer machines |
| CN1429920A (en) * | 2001-12-31 | 2003-07-16 | 新疆钢铁研究所 | Application of limonite as bedding material in method for producing pellet agglomerate |
Non-Patent Citations (1)
| Title |
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| 张一敏: "《球团矿生产技术》", 31 August 2005, 冶金工业出版社 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017140861A1 (en) * | 2016-02-19 | 2017-08-24 | Outotec (Finland) Oy | Method and apparatus for charging pallet cars of a traveling grate for the thermal treatment of bulk materials |
| US10234205B2 (en) | 2016-02-19 | 2019-03-19 | Outotec (Finland) Oy | Method and apparatus for charging pallet cars of a traveling grate for the thermal treatment of bulk materials |
| CN109436864A (en) * | 2018-12-12 | 2019-03-08 | 中冶焦耐(大连)工程技术有限公司 | A kind of electric-melting magnesium production furnace vehicle bottom material laying device and method |
| CN109436864B (en) * | 2018-12-12 | 2024-03-12 | 中冶焦耐(大连)工程技术有限公司 | Furnace wagon bottom material paving device and method for producing electric smelting magnesium |
| CN112176177A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Pretreatment method of natural lump ore |
| CN112176178A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Method for improving thermal decrepitation of natural block ore |
| CN112176176A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Method for improving reducibility of natural lump ore |
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Application publication date: 20130619 |