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Modified steel slag based on steel dust mud and red mud as well as preparation method and application of modified steel slag

A technology of steel slag and dust sludge, applied in the field of comprehensive utilization of resources, can solve the problems of low comprehensive utilization rate of red mud, less than 40% comprehensive utilization rate, and less than output, and achieve large-scale utilization, improve gelling activity, The effect of high economic value

Active Publication Date: 2022-01-28
CHINA RAILWAY CONSTR GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The annual production of steel slag in my country is about 80 million tons, and the accumulated stockpile is about 500 million tons, and the comprehensive utilization rate is less than 40%.
Although red mud has been widely used in these fields, compared with its output, the comprehensive utilization rate of red mud in my country is still quite low, less than 20% of the output

Method used

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  • Modified steel slag based on steel dust mud and red mud as well as preparation method and application of modified steel slag
  • Modified steel slag based on steel dust mud and red mud as well as preparation method and application of modified steel slag
  • Modified steel slag based on steel dust mud and red mud as well as preparation method and application of modified steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The invention uses industrial solid waste to modify steel slag, the modified steel slag includes steel slag and a composite modifier, the composite modifier includes coal gasification residue, red mud and steel dust, and the steel slag and composite modified The mass ratio of the agent is 65:35; the mass ratio of coal gasification residue, red mud and steel dust in the composite modifier is 1:2.5:3.5.

[0044] The mass percentage of each component in the steel slag mentioned above is SiO 2 10~20%, Al 2 o 3 1~7%, Fe 2 o 3 2~33%, MgO 3~12%, CaO 30~50%, FeO 3~15%, Na 2 O 0.01~3%, K 2 O 0.01~3%, SO 3 0.26%, P 2 o 5 1~6%, the mass percentage of each component in the gas residue is SiO 2 30~60%, Al 2 o 3 14~21%, Fe 2 o 3 12~24%, MgO 2~6%, CaO 8~20%, K 2 O 1~3%, Na 2 O 1~3%, SO 3 0.1~2%, P 2 o 5 0.01~1%, TiO 2 0.1~2%, loss on ignition 10~40%, the mass percentage of each component in the red mud is SiO 2 5~30%,Al 2 o 3 15~30%, Fe 2 o 3 10~40%, MgO 0...

Embodiment 2

[0062] The invention uses industrial solid waste to modify steel slag, the modified steel slag includes steel slag and a composite modifier, and the composite modifier includes coal gasification residue, red mud and steel dust; the steel slag and composite modified The mass ratio of the agent is 70:30; the mass ratio of coal gasification residue, red mud and steel dust in the composite modifier is 2:2:3.

[0063] The mass percent of each component in the steel slag is SiO 2 10~20%, Al 2 o 3 1~7%, Fe 2 o 3 2~33%, MgO 3~12%, CaO 30~50%, FeO 3~15%, Na 2 O 0.01~3%, K 2 O 0.01~3%, SO 3 0.26%, P 2 o 5 1~6%, the mass percentage of each component in the gas residue is SiO 2 30~60%, Al 2 o 3 14~21%, Fe 2 o 3 12~24%, MgO 2~6%, CaO 8~20%, K 2 O 1~3%, Na 2 O 1~3%, SO 3 0.1~2%, P 2 o 5 0.01~1%, TiO 2 0.1~2%, loss on ignition 10~40%, the mass percentage of each component in the red mud is SiO 2 5~30%,Al 2 o 3 15~30%, Fe 2 o 3 10~40%, MgO 0.1~2%, CaO 10~20%, K 2...

Embodiment 3

[0081] The invention uses industrial solid waste to modify steel slag, the modified steel slag includes steel slag and a composite modifier, and the composite modifier includes coal gasification residue, red mud and steel dust; the steel slag and composite modified The mass ratio of the modifier is 75:25; the mass ratio of coal gasification residue, red mud and steel dust in the composite modifier is 1.5:3:4.

[0082] The mass percent of each component in the steel slag is SiO 2 10~20%, Al 2 o 3 1~7%, Fe 2 o 3 2~33%, MgO 3~12%, CaO 30~50%, FeO 3~15%, Na 2 O 0.01~3%, K 2 O 0.01~3%, SO 3 0.26%, P 2 o 5 1~6%, the mass percentage of each component in the gas residue is SiO 2 30~60%, Al 2 o 3 14~21%, Fe 2 o 3 12~24%, MgO 2~6%, CaO 8~20%, K 2 O 1~3%, Na 2 O 1~3%, SO 3 0.1~2%, P 2 o 5 0.01~1%, TiO 2 0.1~2%, loss on ignition 10~40%, the mass percentage of each component in the red mud is SiO 2 5~30%,Al 2 o 3 15~30%, Fe 2 o 3 10~40%, MgO 0.1~2%, CaO 10~20%,...

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Abstract

The invention discloses modified steel slag based on steel dust and mud and red mud as well as a preparation method and application of the modified steel slag, wherein the modified steel slag comprises steel slag and a composite modifier, and the composite modifier comprises coal gasification residues, the red mud and the steel dust mud; the preparation method comprises the following steps: pretreatment of steel slag, pretreatment of the coal gasification residues, pretreatment of the red mud, pretreatment of the steel dust mud, ball-milling mixing, compression molding, sintering modification and blast quenching. According to the modified steel slag and the preparation method and application thereof, the problems that steel slag, steel dust mud, red mud and coal gasification residues cannot be effectively utilized and pollute the environment can be solved, so that the steel slag, the coal gasification residues, the steel dust mud and the red mud are effectively utilized, and the gelling activity and stability of the steel slag are improved; and meanwhile, waste is turned into wealth, large-scale utilization of waste is achieved, high economic value is generated, and the purposes of green sustainable development, energy conservation, environmental protection and resource utilization of solid waste are achieved.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of resources, in particular to a modified steel slag based on steel dust and red mud and its preparation method and application. Background technique [0002] Steel slag is a bulk industrial solid waste obtained by cooling the remaining steelmaking slag. According to the smelting method, it can be divided into open-hearth furnace slag, electric furnace slag and converter steel slag. Its emission is about 12-20% of crude steel output. The annual production of steel slag in my country is about 80 million tons, and the accumulated stockpile is about 500 million tons, and the comprehensive utilization rate is less than 40%. Most iron and steel enterprises only store the remaining steel tailings after crushing and magnetic separation to recover iron, which has caused serious problems of land occupation and environmental pollution. The mineral composition of steel slag is greatly affe...

Claims

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Application Information

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IPC IPC(8): C04B18/14C21B3/06C21B13/00C22B1/16C22B1/24C22B1/248
CPCC04B40/0046C21B3/06C21B13/008C22B1/248C22B1/2406C22B1/16C04B18/142C04B18/065C04B18/0409Y02P10/20Y02W30/50Y02W30/91
Inventor 翟玉新王长龙王飞张凯帆田小平陈敬亮李鑫荊牮霖平浩岩马锦涛张鸿泽杨丰豪曲俞董磊史乐贤
Owner CHINA RAILWAY CONSTR GROUP
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