CN104828877A - Method for recycling ferric oxide in converter steel slag - Google Patents
Method for recycling ferric oxide in converter steel slag Download PDFInfo
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- CN104828877A CN104828877A CN201510282540.8A CN201510282540A CN104828877A CN 104828877 A CN104828877 A CN 104828877A CN 201510282540 A CN201510282540 A CN 201510282540A CN 104828877 A CN104828877 A CN 104828877A
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Abstract
The invention relates to a converter steel slag recycling method for improving recycling rate, in particular to a method for recycling ferric oxide in converter steel slag. By the method, waste like the converter steel slag can be utilized fully, CO2 emission can be reduced, and exploitation of existing mine resources can be reduced. The method mainly includes the following steps: a, in a stable liquid-state steel slag state, blowing blast furnace gas or coke oven gas into liquid-state steel slag, and enabling oxidation reaction to last 15-35min; b, when temperature reaches 1300-1400 DEG C, increasing content of carbon dioxide in blast furnace gas or coke oven gas until highest temperature reaches 1400-1600 DEG C; c, cooling the liquid-state steel slag to be cake-shaped at a cooling rate of 1-8K/min; d, performing separation deep-processing on the steel slag after being cooled through recycling processes like breaking, screening and magnetic separation. By the method, utilization of waste slag can be realized well, and requirements of recycling economy are met; the method is suitable for recycling ferric iron in the converter steel slag.
Description
Technical field
The present invention relates to a kind of raising and reclaim bessemer furnace slag recovery method, the recovery method of ferric oxide in especially a kind of bessemer furnace slag.
Background technology
Bessemer furnace slag is the molten slag that in converter, slagging process produces, temperatures as high 1600 DEG C, the mainly progressively dissolution process of lime in slag, and the final silicate slag obtained containing a large amount of solid solution phase SS (solid matters of one or more solutes).
In fusion process, require to add the slag making materialses such as a certain amount of lime according to process for making, silicate containing gelling property in the bessemer furnace slag of final generation, but due to each oxide components content and the cement property of there are differences, comprise moulding process difference, silicate content and quality are all not as good as cement clinker.Wherein, tricalcium silicate (C3S) content (3 ~ 5%) comparatively grog is low by 50%, causes early strength low; Dicalcium Phosphate (Feed Grade) (C2S) content (40%), higher than cement clinker (20%), makes the later strength of slag higher than cement clinker; Wustite and SS phase, up to 50%, affect its gelling.And cement sintering process is that obtaining through 1300-1450 DEG C of high-temperature calcination take Calucium Silicate powder as the grog (tricalcium silicate, Dicalcium Phosphate (Feed Grade), tricalcium aluminate, tetracalcium aluminoferrite) of main component with Wingdale and clay for main raw material.Therefore bessemer furnace slag belongs to " burning low-quality grog ".Containing a certain amount of silicate in bessemer furnace slag, but because CaO content is few, Fe2O3 is on the high side, cause C3S on the low side, and C2S and SS phase is too much; In addition in converter, major part is in liquid phase state, and crystallization velocity is very fast and grow and all comparatively complete, and makes active reduction.In addition, containing higher ferric oxide in slag, Fe2O3 reaches more than 25%, by magnetic separation process choosing to the greatest extent, and cannot run off with slag, defines the waste of iron resources.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of waste materials such as bessemer furnace slag that make and obtains whole utilizations, saves CO2 discharge, reduces the recovery method of ferric oxide in the bessemer furnace slag to the exploitation of existing mine resources.
The technical solution adopted for the present invention to solve the technical problems is: the recovery method of ferric oxide in bessemer furnace slag,
When slag is solid states, comprise the following steps:
A, first cooled steel-making slag powder is worn into specific surface area and be greater than 100m
2the fine powder of/kg, then be pressed into pancake shape;
B, above-mentioned pancake shape slag is machined to stable liquid steel slag state, in liquid steel slag, blast furnace gas or coke-oven gas is blown into the flow velocity of 100-500ml/min, the oxidation reaction process carried out continues 15-35min, and oxidizing reaction can be accelerated along with the rising of temperature thereupon;
C, when temperature reaches 1300-1400 DEG C, increase the content of carbonic acid gas in blast furnace gas or coke-oven gas, and reduce oxygen content with inhibited oxidation speed, continue sustained reaction 1-2h, until temperature is up to 1400-1600 DEG C;
D, through above-mentioned steps, substantially complete FeO to Fe
3o
4oxidation, also need simultaneously stop Fe
3o
4to Fe
2o
3further oxidation, thus avoid Fe
3o
4reoxidize, meanwhile, with the rate of cooling of 1-8K/min, liquid steel slag is cooled to pie;
E, by recovery process such as fragmentation, screening, magnetic separation, sorting deep processing is carried out to cooled slag;
When slag is liquid condition, comprise the following steps:
A, under stable liquid steel slag state, in liquid steel slag, be blown into blast furnace gas or coke-oven gas with the flow velocity of 100-500ml/min, the oxidation reaction process carried out continues 15-35min, and oxidizing reaction can be accelerated along with the rising of temperature thereupon;
B, when temperature reaches 1300-1400 DEG C, increase the content of carbonic acid gas in blast furnace gas or coke-oven gas, and reduce oxygen content with inhibited oxidation speed, continue sustained reaction 1-2h, until temperature is up to 1400-1600 DEG C;
C, through above-mentioned steps, substantially complete FeO to Fe
3o
4oxidation, also need simultaneously stop Fe
3o
4to Fe
2o
3further oxidation, thus avoid Fe
3o
4reoxidize, meanwhile, with the rate of cooling of 1-8K/min, liquid steel slag is cooled to pie;
D, by recovery process such as fragmentation, screening, magnetic separation, sorting deep processing is carried out to cooled slag.
Further, the coke-oven gas described in step a is formed primarily of hydrogen and methane, and containing a small amount of carbon monoxide, carbon dioxide and oxygen.
The invention has the beneficial effects as follows: the present invention take bessemer furnace slag as main raw material, the ferric oxide of nonmagnetic or weak magnetic and iron protoxide is changed into tool magnetic Z 250 by oxygenizement under liquid condition, separate by conventional magnetic separation process or the oxide compound of method and recyclable magnetic separation iron and be used again, magnetic separation iron can be used for sintering, and remaining non magnetic slag then can be applied in cement better.This application can make the waste materials such as bessemer furnace slag obtain whole utilizations, saves CO
2discharge, reduces the exploitation to existing mine resources.Adopt the present invention can realize the utilization of waste residue preferably, meet recycling economy, among the recovery process being particularly useful for reclaiming ferric oxide in bessemer furnace slag.
Embodiment
The recovery method of ferric oxide in bessemer furnace slag, is characterized in that:
When slag is solid states, comprise the following steps:
A, first cooled steel-making slag powder is worn into specific surface area and be greater than 100m
2the fine powder of/kg, then be pressed into pancake shape;
B, above-mentioned pancake shape slag is machined to stable liquid steel slag state, in liquid steel slag, blast furnace gas or coke-oven gas is blown into the flow velocity of 100-500ml/min, the oxidation reaction process carried out continues 15-35min, and oxidizing reaction can be accelerated along with the rising of temperature thereupon;
C, when temperature reaches 1300-1400 DEG C, increase the content of carbonic acid gas in blast furnace gas or coke-oven gas, and reduce oxygen content with inhibited oxidation speed, continue sustained reaction 1-2h, until temperature is up to 1400-1600 DEG C;
D, through above-mentioned steps, substantially complete FeO to Fe
3o
4oxidation, also need simultaneously stop Fe
3o
4to Fe
2o
3further oxidation, thus avoid Fe
3o
4reoxidize, meanwhile, with the rate of cooling of 1-8K/min, liquid steel slag is cooled to pie;
E, by recovery process such as fragmentation, screening, magnetic separation, sorting deep processing is carried out to cooled slag;
When slag is liquid condition, comprise the following steps:
A, under stable liquid steel slag state, in liquid steel slag, be blown into blast furnace gas or coke-oven gas with the flow velocity of 100-500ml/min, the oxidation reaction process carried out continues 15-35min, and oxidizing reaction can be accelerated along with the rising of temperature thereupon;
B, when temperature reaches 1300-1400 DEG C, increase the content of carbonic acid gas in blast furnace gas or coke-oven gas, and reduce oxygen content with inhibited oxidation speed, continue sustained reaction 1-2h, until temperature is up to 1400-1600 DEG C;
C, through above-mentioned steps, substantially complete FeO to Fe
3o
4oxidation, also need simultaneously stop Fe
3o
4to Fe
2o
3further oxidation, thus avoid Fe
3o
4reoxidize, meanwhile, with the rate of cooling of 1-8K/min, liquid steel slag is cooled to pie;
D, by recovery process such as fragmentation, screening, magnetic separation, sorting deep processing is carried out to cooled slag.
Traditional fusion process, can require to add the slag making materialses such as a certain amount of lime according to process for making, and the silicate containing gelling property in the bessemer furnace slag finally produced, but due to each oxide components content and the cement property of there are differences, comprise moulding process difference, silicate content and quality are all not as good as cement clinker.Wherein, tricalcium silicate (C
3s) comparatively grog is low by 50% for content (3 ~ 5%), causes early strength low; Dicalcium Phosphate (Feed Grade) (C
2s) content (40%) is higher than cement clinker (20%), makes the later strength of slag higher than cement clinker; Wustite and SS phase, up to 50%, affect its gelling.And cement sintering process is that obtaining through 1300-1450 DEG C of high-temperature calcination take Calucium Silicate powder as the grog (tricalcium silicate, Dicalcium Phosphate (Feed Grade), tricalcium aluminate, tetracalcium aluminoferrite) of main component with Wingdale and clay for main raw material.Therefore bessemer furnace slag belongs to " burning low-quality grog ".Containing a certain amount of silicate in bessemer furnace slag, but because CaO content is few, Fe
2o
3on the high side, cause C
3s is on the low side, and C
2s and SS phase is too much; In addition in converter, major part is in liquid phase state, and crystallization velocity is very fast and grow and all comparatively complete, and makes active reduction.In addition, containing higher ferric oxide in slag, Fe
2o
3reach more than 25%, by magnetic separation process choosing to the greatest extent, and cannot run off with slag, define the waste of iron resources.
The present invention looks for another way, the ferric oxide of nonmagnetic or weak magnetic and iron protoxide is changed into tool magnetic Z 250 by oxygenizement under liquid condition, separate by conventional magnetic separation process or the oxide compound of method and recyclable magnetic separation iron and be used again, magnetic separation iron can be used for sintering, and remaining non magnetic slag then can be applied in cement better.
In addition, the coke-oven gas described in step a is formed primarily of hydrogen and methane, and containing a small amount of carbon monoxide, carbon dioxide and oxygen, ensures the carrying out of oxidation.
Embodiment
Under stable liquid steel slag state, (wherein combustiblecomponents CO content accounts for about 25%, H to be blown into blast furnace gas wherein with the flow velocity of 220ml/min
2, CH
4content little, CO
2, N
2content account for 15%, 55% respectively), oxidation reaction process continues 30min, along with temperature rising oxidation accelerates thereupon.1400 DEG C time, suitably increase the content of carbonic acid gas in coal gas, reduce oxygen content with inhibited oxidation speed, sustained reaction 1h, temperature is up to 1550 DEG C, now substantially completes FeO to Fe
3o
4oxidation, stop Fe simultaneously
3o
4to Fe
2o
3further oxidation, thus avoid Fe
3o
4reoxidize, finally with the rate of cooling of 5K/min, liquid steel slag is cooled to pie.
In addition, the basicity of slag is higher, is more conducive to FeO to Fe
3o
4oxidation, Fe
3o
4content higher.Cooled slag can carry out sorting deep processing, and reclaim steel slag magnetically dressing by techniques such as fragmentation, screening, magnetic separation and be used for sintering, tailings is then for cement or concrete blended material.
Claims (2)
1. the recovery method of ferric oxide in bessemer furnace slag, is characterized in that:
When slag is solid states, comprise the following steps:
A, first cooled steel-making slag powder is worn into specific surface area and be greater than 100m
2the fine powder of/kg, then be pressed into pancake shape;
B, above-mentioned pancake shape slag is machined to stable liquid steel slag state, in liquid steel slag, blast furnace gas or coke-oven gas is blown into the flow velocity of 100-500ml/min, the oxidation reaction process carried out continues 15-35min, and oxidizing reaction can be accelerated along with the rising of temperature thereupon;
C, when temperature reaches 1300-1400 DEG C, increase the content of carbonic acid gas in blast furnace gas or coke-oven gas, and reduce oxygen content with inhibited oxidation speed, continue sustained reaction 1-2h, until temperature is up to 1400-1600 DEG C;
D, through above-mentioned steps, substantially complete FeO to Fe
3o
4oxidation, also need simultaneously stop Fe
3o
4to Fe
2o
3further oxidation, thus avoid Fe
3o
4reoxidize, meanwhile, with the rate of cooling of 1-8K/min, liquid steel slag is cooled to pie;
E, by recovery process such as fragmentation, screening, magnetic separation, sorting deep processing is carried out to cooled slag;
When slag is liquid condition, comprise the following steps:
A, under stable liquid steel slag state, in liquid steel slag, be blown into blast furnace gas or coke-oven gas with the flow velocity of 100-500ml/min, the oxidation reaction process carried out continues 15-35min, and oxidizing reaction can be accelerated along with the rising of temperature thereupon;
B, when temperature reaches 1300-1400 DEG C, increase the content of carbonic acid gas in blast furnace gas or coke-oven gas, and reduce oxygen content with inhibited oxidation speed, continue sustained reaction 1-2h, until temperature is up to 1400-1600 DEG C;
C, through above-mentioned steps, substantially complete FeO to Fe
3o
4oxidation, also need simultaneously stop Fe
3o
4to Fe
2o
3further oxidation, thus avoid Fe
3o
4reoxidize, meanwhile, with the rate of cooling of 1-8K/min, liquid steel slag is cooled to pie;
D, by recovery process such as fragmentation, screening, magnetic separation, sorting deep processing is carried out to cooled slag.
2. the recovery method of ferric oxide in bessemer furnace slag as claimed in claim 1, is characterized in that: the coke-oven gas described in step a is formed primarily of hydrogen and methane, and containing a small amount of carbon monoxide, carbon dioxide and oxygen.
Priority Applications (1)
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|---|---|---|---|
| CN201510282540.8A CN104828877A (en) | 2015-05-28 | 2015-05-28 | Method for recycling ferric oxide in converter steel slag |
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|---|---|---|---|
| CN201510282540.8A CN104828877A (en) | 2015-05-28 | 2015-05-28 | Method for recycling ferric oxide in converter steel slag |
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| CN104828877A true CN104828877A (en) | 2015-08-12 |
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ID=53807137
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106854407A (en) * | 2017-01-09 | 2017-06-16 | 娄底市湖泉亿达工贸有限公司 | A kind of method of comprehensive utilization of converter slag |
| CN110550663A (en) * | 2019-09-30 | 2019-12-10 | 北方民族大学 | method for recycling iron oxide in steel slag |
| CN110698087A (en) * | 2019-11-05 | 2020-01-17 | 中国科学院过程工程研究所 | Device and method for comprehensively utilizing thermal-state steel slag |
| CN114716169A (en) * | 2022-05-09 | 2022-07-08 | 山西太钢不锈钢股份有限公司 | Method for reducing content of high-activity alkaline oxides in steel slag |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106854407A (en) * | 2017-01-09 | 2017-06-16 | 娄底市湖泉亿达工贸有限公司 | A kind of method of comprehensive utilization of converter slag |
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| CN110550663A (en) * | 2019-09-30 | 2019-12-10 | 北方民族大学 | method for recycling iron oxide in steel slag |
| CN110698087A (en) * | 2019-11-05 | 2020-01-17 | 中国科学院过程工程研究所 | Device and method for comprehensively utilizing thermal-state steel slag |
| CN110698087B (en) * | 2019-11-05 | 2020-11-10 | 中国科学院过程工程研究所 | Device and method for comprehensively utilizing thermal-state steel slag |
| CN114716169A (en) * | 2022-05-09 | 2022-07-08 | 山西太钢不锈钢股份有限公司 | Method for reducing content of high-activity alkaline oxides in steel slag |
| CN114716169B (en) * | 2022-05-09 | 2023-06-23 | 山西太钢不锈钢股份有限公司 | Method for reducing high activity alkaline oxide content in steel slag |
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Effective date of abandoning: 20180105 |