Method for treating steel slag

A technology of steel slag and converter steel slag, which is applied in the field of steel slag treatment, can solve the problems of low utilization value, inability to separate iron oxide, and inability to recycle phosphorus, so as to avoid the pressure of environmental protection, reduce costs, and use high value-added effects

Inactive Publication Date: 2019-08-16
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metallurgical slag mainly includes blast furnace slag and converter slag (steel slag), and blast furnace slag has basically realized resource utilization; however, converter slag has relatively complex characteristics and high value-added resource utilization rate has been low. How to treat steel slag efficiently and environmentally friendly has become the current pressing issues
[0003] At present, steel slag treatment processes include hot pouring method, hot braising method, wind quenching method, drum method, etc. The above processes can only separate metallic iron from steel slag, but cannot separate iron oxide. The use of tailings (the treated tailings are mainly used for foundation treatment of the project, and the utilization value is not high)
In addition, resources such as waste heat and phosphorus in steel slag cannot be recycled.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take conventional converter slag as an example:

[0031] The invention provides a method for processing steel slag, comprising the steps of:

[0032] S1, will contain the mass percentage to be 1.7%P 2 o 5 , and the liquid converter steel slag with an alkalinity of 3 is tapped, and then the furnace is protected by slag splashing;

[0033] S2. Pour the liquid steel slag obtained in step S1 into a submerged arc furnace of 45MVA, add coke powder at 120kg / t slag and silica at 300kg / t slag to carry out reduction smelting, when the Tfe quality in the slag of reduction smelting is 100 When the iron content is less than 1% and the alkalinity is 1.2, slag removal is carried out to obtain reduced slag, which is quenched in water to form slag, which is then recovered; when the reduced molten iron (containing P 2.1%) in the furnace reaches 80 tons After that, iron tapping is carried out to obtain reduced molten iron;

[0034] S3, to step S2 obtained reduced molten iron, add the ...

Embodiment 2

[0039] Take dephosphorization converter slag as an example:

[0040] The invention provides a method for processing steel slag, comprising the steps of:

[0041] S1, will contain the mass percent content as 5%P 2 o 5 , and the liquid converter steel slag with an alkalinity of 2 is tapped, and then the furnace is protected by slag splashing;

[0042] S2. Pour the liquid steel slag obtained in step S1 into a submerged arc furnace of 45MVA, add coke powder at 100kg / t slag and silica at 150kg / t slag to carry out reduction smelting, when the Tfe quality in the slag of reduction smelting is 100 When the iron content is less than 1% and the alkalinity is 1.0, slag removal is carried out to obtain reduced slag, which is quenched in water to form slag, which is then recovered; when the reduced molten iron (containing P 7.7%) in the furnace reaches 80 tons After that, iron tapping is carried out to obtain reduced molten iron;

[0043] S3, to step S2 obtained reduced molten iron, add...

Embodiment 3

[0048] Take decarburized converter slag as an example:

[0049] S1, will contain the mass percentage to be 1.4%P 2 o 5 , and the liquid converter steel slag with an alkalinity of 3 is tapped, and then the furnace is protected by slag splashing;

[0050]S2, pour the liquid steel slag gained in step S1 into a submerged arc furnace of 45MVA, add anthracite at 120kg / t slag and iron-containing tailings at 300kg / t slag, carry out reduction smelting, when the Tfe in the slag of reduction smelting When the mass percent content is less than 1%, and the basicity is 1.5, slagging is carried out to obtain reduced slag, and the reduced slag is water-quenched to form slag, which is then recovered; when the reduced molten iron (containing P 2.1%) in the furnace reaches After 80 tons, iron is tapped to obtain reduced molten iron;

[0051] S3, to step S2 obtained reduced molten iron, add the sodium carbonate of 140kg / t · molten iron and 30m 3 / t. Oxygen in molten iron, desulfurization and / ...

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PUM

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Abstract

The invention relates to a method for treating steel slag, and belongs to the technical field of steel slag treatment. The method comprises the following steps that 1, liquid-state converter steel slag is discharged, and operation of slag splashing for converter protection is conducted; 2, reduction smelting is conducted on the liquid-state steel slag obtained in the step 1, slag discharging is conducted, reduced slag is obtained, iron discharging is conducted, reduced molten iron is obtained, and the reduced slag is recycled; 3, the reduced molten iron obtained in the step 2 is subjected to desulfuration and / or desilicication and / or dephosphorization operation, purified molten iron and slag are obtained, and the purified molten iron is smelted and then recycled; 4, the slag obtained in the step 3 is cooled with water and then filtered, filtrate and filter residues are obtained, and the filter residues are dried, smelted and recycled; 5, acid is added into the filtrate obtained in thestep 4 till the PH is neutral, precipitates and gas are produced, the precipitates are filtered and recycled, and filtrate obtained through filtering is retained for use; and 6, the gas and the filtrate which are obtained in the step 5 are treated through a FeCl3 solution. The method for treating the steel slag has the characteristics of being high in efficiency and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of steel slag processing, and in particular relates to a method for processing steel slag. Background technique [0002] With the implementation of the "Environmental Protection Tax Law" from January 1, 2018, the environmental protection tax on metallurgical slag is 25 yuan / t. Metallurgical slag mainly includes blast furnace slag and converter slag (steel slag), and blast furnace slag has basically realized resource utilization; however, converter slag has relatively complex characteristics and high value-added resource utilization rate has been low. How to treat steel slag efficiently and environmentally friendly has become the current problems that urgently need to be resolved. [0003] At present, steel slag treatment processes include hot pouring method, hot braising method, wind quenching method, drum method, etc. The above processes can only separate metallic iron from steel slag, but cannot separate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B11/10C21C1/02C21C1/04
CPCC21B3/06C21B11/10C21C1/02C21C1/04Y02P10/20Y02W30/50
Inventor 吉立鹏张卫东刘清梅武建龙陈辉张丙龙曾卫民吴耀春赵长亮秦登平黄财德杨晓山关顺宽苏震霆陈虎王飞
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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