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High-temperature molten steel slag treating method

A technology of liquid steel slag and a treatment method, which is applied in the field of waste steel slag recycling, can solve the problems of inability to use liquid steel slag for atomization treatment, unable to adjust the fluidity of steel slag, etc., and achieves wide source of raw materials, good steel slag stability, and improved application range. Effect

Inactive Publication Date: 2012-07-04
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This steel slag modifier cannot adjust the fluidity of steel slag, and it cannot be atomized with liquid steel slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The original steel slag is selected from the steel slag of Jinan Iron and Steel Group, and its chemical composition is CaO 38.96%, SiO 2 13.27%, Fe 2 o 3 22.62%, FeO 9.17%, Al 2 o 3 1.59%, MgO 6.68%, free calcium oxide 2.6%, free magnesium oxide 6.68%, other 6.52%.

[0022] According to the composition of steel slag: CaO: SiO 2 = =3.15:1;

[0023] CaO: SiO 2 :Al 2 o 3 = ;

[0024] In 1000kg steel slag, CaO: 1000000×0.3896 / 56=6957 (mol);

[0025] SiO 2 :1000000×0.1327 / 60=2211.7 (mol);

[0026] Given the slag content and CaO:SiO 2 =2.5-3:1 is the closest, so the configuration of improver should be based on this. The target ratio is 3:1, and the amount of improver added is 1% of the mass of steel slag, which is 10kg.

[0027] Calculate the CaO and SiO that need to be added in 1000kg steel slag 2 The masses are 2624g and 7376g respectively.

[0028] Weigh 2624g CaO and 7376g SiO 2 , were crushed to below 5 mesh, and then mixed evenly and ...

Embodiment 2

[0031] The chemical composition of the original steel slag is CaO 40.32%, SiO 2 28.32%, FeO8.2%, Al 2 o 3 2.21%, MgO 5.0%, free calcium oxide 12.3%, free magnesium oxide 3.5%, other 1.5%.

[0032] According to the composition of steel slag: CaO: SiO 2 = =1.53:1;

[0033] CaO: SiO 2 :Al 2 o 3 = ;

[0034] In 1000kg steel slag, CaO: 1000000×0.4032 / 56=7200 (mol);

[0035] SiO 2 :1000000×0.2832 / 60=4720 (mol);

[0036] Al 2 o 3 : 1000000×0.024 / 102=235.3 (mol);

[0037] Given the slag content and CaO:SiO 2 :Al 2 o 3 =25-30: 15-25:1 is the closest, so the target ratio is set to CaO:SiO 2 :Al 2 o 3 =30:21:1, the amount of modifier added is 5% of the steel slag mass, which is 50kg;

[0038] Calculate the CaO and SiO that need to be added in 1000kg steel slag 2 and Al 2 o 3 The masses are 16750g, 31762g and 1488g respectively;

[0039] Weigh 16750g CaO, 31762g SiO 2 and 1488g Al 2 o 3 , were crushed to less than 5 mesh, and then ...

Embodiment 3

[0042] The chemical composition of the original steel slag is CaO 39.5%, SiO 2 16.8%, FeO17.2%, Al 2 o 3 2.4%, MgO 6.8%, free calcium oxide 10.3%, free magnesium oxide 6.5%, others, 0.5%.

[0043] According to the composition of steel slag: CaO: SiO 2 = =2.52:1;

[0044] CaO: SiO 2 :Al 2 o 3 = ;

[0045] In 1000kg steel slag, CaO: 1000000*0.395 / 56=7053.6 (mol);

[0046] SiO 2 :1000000×0.168 / 60=2800 (mol);

[0047] Al 2 o 3 : 1000000×0.024 / 102=235.3 (mol);

[0048] For raw steel slag CaO: SiO 2 :Al 2 o 3 =30: 11.9:1 and CaO: SiO 2 =2.52:1, so the selected target ratio is CaO:SiO 2 =2.4:1, the amount of modifier added is 2.5% of the steel slag mass, which is 25kg.

[0049] Calculate the CaO and SiO that need to be added in 1000kg steel slag 2 and Al 2 o 3 The masses of are 11518g and 13482g respectively;

[0050] Weigh 11518g CaO and 13482g SiO 2 , crushed to less than 5 meshes, and then mixed uniformly to make a modifier for use; take 1000kg of liq...

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Abstract

The invention relates to a high-temperature molten steel slag treating method. A modifying agent with main components containing calcium oxide, silicon oxide and aluminum oxide is added, therefore the molar ratio of calcium oxide, silicon oxide and aluminum oxide in modified steel slag meets one or two kinds of CaO:SiO2=2.5-3:1 or CaO:SiO2:Al2O3=25-30:15-22:1, and the steel slag forms a stable spinel structure. In the method, the raw materials of the modifying agent of the steel slag have wide sources, the cost is low, the manufacture process is simple, and the method is suitable for converters, main frequency furnaces and arc furnaces to produce various kinds of steel slag. The steel slag is modified, the stability of the steel slag is good, and free calcium oxide and aluminum oxide in the steel slag can be preferentially reduced. The steel slag forms the stable spinel structure, so that the application scope of the steel slag is expanded.

Description

technical field [0001] The invention relates to the technical field of waste steel slag recycling, in particular to a method for treating high-temperature liquid steel slag. Background technique [0002] Steel slag is a by-product of the steelmaking process, and the discharge of steel slag accounts for about 15%-20% of the steel product volume. In 2011, the total amount of steel slag in the country reached 350 million tons. A large amount of steel slag is discarded and piled up, which pollutes the environment and takes up a lot of land. At the same time, it causes waste of resources, causes huge damage to the ecological environment, and affects the sustainable development of the steel industry. It is one of the important issues facing my country's iron and steel industry to study the comprehensive utilization of high-quality and high-value steel slag and realize the efficient recycling of steel slag. [0003] The composition of steel slag is very complex, containing ...

Claims

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Application Information

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IPC IPC(8): C21B3/06
CPCY02W30/50
Inventor 闫焉服陈新芳闫红星王敏陈柯朱锦洪
Owner HENAN UNIV OF SCI & TECH
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