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A modified steel slag based on steel dust and red mud, its preparation method and application

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

Active Publication Date: 2022-05-06
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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  • A modified steel slag based on steel dust and red mud, its preparation method and application
  • A modified steel slag based on steel dust and red mud, its preparation method and application
  • A modified steel slag based on steel dust and red mud, its preparation method and application

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 a modified steel slag based on steel dust and red mud and its preparation method and application. The modified steel slag includes steel slag and a composite modifier, and the composite modifier includes coal gasification residue, red mud and Steel dust sludge; the preparation method includes the following steps: steel slag pretreatment, coal gasification residue pretreatment, red mud pretreatment, steel dust sludge pretreatment, ball mill mixing, compression molding, sintering modification, blast quenching. The modified steel slag and its preparation method and application can solve the problem that steel slag, steel dust, red mud and coal gasification residue cannot be effectively utilized and pollute the environment, thereby achieving the goal of effectively utilizing steel slag, coal gasification residue, steel dust and red mud At the same time improve the gelling activity and stability of steel slag, turn waste into treasure, realize large-scale utilization of waste, generate high economic value, and realize the purpose of green sustainable development of solid waste, energy saving and environmental protection, and resource utilization .

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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Patent Type & Authority Patents(China)
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