Technology for recovering iron ore concentrate and coke powder from blast furnace gas dust or gas sludge

A technology for blast furnace gas ash and gas mud is applied in the field of comprehensive utilization of mineral resources and solid waste, and achieves the effects of simple and continuous process, strong industrial promotion prospects and high recovery rate

Inactive Publication Date: 2012-03-28
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the technology or process for separating and recovering iron and coke from gas ash (mud) using self-reduction has not been reported yet.

Method used

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  • Technology for recovering iron ore concentrate and coke powder from blast furnace gas dust or gas sludge
  • Technology for recovering iron ore concentrate and coke powder from blast furnace gas dust or gas sludge
  • Technology for recovering iron ore concentrate and coke powder from blast furnace gas dust or gas sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Table 1-1 lists the main chemical components of gas ash from blast furnace solid waste from a steel company. TFe is 31%, carbon content is 33.6%, and SiO 2 It is 5.87%, CaO is 4.35%, and the content of S, Zn, and Pb is also relatively high.

[0016] Table 1-1 The main chemical composition of gas ash in a steel company / %

[0017]

[0018] According to the above analysis, the particle size of gas ash -0.074mm accounts for about 40%. It is sent to the rotary kiln for drying, preheating, magnetization roasting, roasting temperature is about 800℃, roasting time 45min, roasted mineral water quenched and sent to wet type The grinding particle size of the ball mill is -0.074mm, which accounts for about 65%; the fine-grained mineral material is mixed with tap water to form a slurry with a slurry concentration of 25%. The slurry is sent to a wet drum weak magnetic separator, and iron concentrate is obtained by weak magnetic separation (0.12T) Mine and primary tailings to obtain iron c...

Embodiment 2

[0023] Table 2-1 shows the main chemical composition of gas mud from blast furnace solid waste of a steel company. The main minerals of gas mud are hematite and magnetite, and the minor minerals are olivine, feldspar silicate minerals, coke powder and a small amount. quartz. The content of hematite is 45%-50%, the maximum particle size is 0.07mm, mostly 0.03-0.05mm, mostly hematite single crystal, and a small amount of hematite is distributed in the silicate cement phase.

[0024] Table 1-2 The main chemical components of blast furnace gas mud in a steel company

[0025]

[0026] The process of recovering iron ore and carbon powder is as follows: the gas mud is directly sent to the boiling furnace for drying, preheating, magnetized roasting, the roasting temperature is about 750℃, and the roasting time is 15-30 minutes, and the roasted mineral water is quenched and sent directly to the wet ball mill Grinding particle size -0.074mm accounts for 70%; obtain fine-grained mineral mate...

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Abstract

The invention relates to a technology for recovering iron ore concentrate and coke powder from blast furnace gas dust or gas sludge, characterized by using coke carried by the gas dust (sludge) as a reducing agent, carrying out magnetization roasting on the gas dust (sludge), converting the weak magnetic iron ore in the gas dust (sludge) into strongly magnetic mineral, then recovering through magnetic separation, and recovering excess carbon powder through flotation. The technology comprises the following main steps: 1) sending the dried gas dust (sludge) in a furnace, and carrying out reduction magnetization roasting; 2) carrying out wet grinding and weak magnetic separation on the roasted gas dust (sludge) to obtain the iron ore concentrate; and 3) carrying out flotation on the magnetically selected tailings to obtain the coke powder. The technology has the advantages of simple and continuous process, low energy consumption, and high recovery rate of iron and carbon, and realizes the comprehensive utilization of the gas dust (sludge).

Description

Technical field [0001] The invention relates to a process for recovering iron concentrate and coke powder from blast furnace gas ash or gas mud, and belongs to the field of comprehensive utilization of mineral resources and solid waste. Background technique [0002] With the rapid economic development of our country this year, our country's demand for iron ore is increasing day by day. At present, the self-sufficiency rate of iron ore required by my country’s iron and steel industry is only about 46%. The domestic iron ore resource is severely shorted, which has become a bottleneck restricting the development of my country’s iron and steel enterprises. Therefore, it is necessary to expand the development and utilization of my country’s iron ore and secondary iron. Utilization of mineral resources. Among them, iron-containing dust is one of the main solid wastes produced by the modern steel industry, generally containing 30% to 70% of iron, accounting for 8% to 12% of steel output...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B1/02B03C1/015B03C1/02B03D1/00
CPCY02P10/20
Inventor 张邦文赵瑞超布林朝克
Owner INNER MONGOLIA UNIV OF SCI & TECH
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