Method for treating titanium-containing red mud

A red mud and treatment process technology, applied in the field of solid waste treatment, can solve the problems of low titanium content, increase the difficulty of recycling other elements such as iron, and low utilization value, reduce temperature and time, and achieve comprehensive recycling. , the effect of reducing the dosage

Pending Publication Date: 2017-10-20
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The content of titanium in red mud is relatively high. If it is directly processed by pyrotechnics, the content of titanium in the obtained slag is low, and its use value is not great.
At the same time, the presence of titanium in red mud increases the difficulty of recycling other elements such as iron

Method used

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  • Method for treating titanium-containing red mud

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Effect test

Embodiment 1

[0038] The titanium-containing red mud with a titanium content of 8.25wt%, an iron content of 30.52wt%, and an aluminum content of 24.24wt% was leached with a hydrochloric acid solution, the concentration of the hydrochloric acid solution was 4mol / L, the leaching time was 60min, and the leaching temperature was 60°C to obtain a leaching residue and leachate.

[0039]Al 2 o 3 , Fe 2 o 3 etc., and recover the hydrochloric acid obtained by evaporation, and use it in the leaching process of titanium-containing red mud for recycling. Take 100 parts by weight of the mixture, add 6 parts by weight of additives and 25 parts by weight of reducing agent, mix evenly, and press into blocks to obtain green balls. After the green balls are dried, reduction and melting treatment are carried out, the reduction temperature is controlled at 1150°C, the reduction time is 25 minutes, the melting temperature is 1450°C, and the melting time is 40 minutes to obtain molten iron and aluminum-rich ...

Embodiment 2

[0042] The titanium-containing red mud with a titanium content of 15.26wt%, an iron content of 28.28wt%, and an aluminum content of 20.85wt% was leached with a hydrochloric acid solution, the concentration of the hydrochloric acid solution was 5mol / L, the leaching time was 60min, and the leaching temperature was 70°C to obtain a leaching residue and leachate.

[0043] Al 2 o 3 , Fe 2 o 3 etc., and recover the hydrochloric acid obtained by evaporation, and use it in the leaching process of titanium-containing red mud for recycling. Take 100 parts by weight of the mixture, add 6 parts by weight of additives and 25 parts by weight of reducing agent, mix evenly, and press into blocks to obtain green balls. After the green balls are dried, reduction and melting treatment are carried out, the reduction temperature is controlled at 1180°C, the reduction time is 30 minutes, the melting temperature is 1500°C, and the melting time is 50 minutes to obtain molten iron and aluminum-ric...

Embodiment 3

[0046] The titanium-containing red mud with a titanium content of 18.06wt%, an iron content of 27.86wt%, and an aluminum content of 18.15wt% was leached with a hydrochloric acid solution, the concentration of the hydrochloric acid solution was 6mol / L, the leaching time was 90min, and the leaching temperature was 70°C to obtain a leaching residue and leachate.

[0047] Al 2 o 3 , Fe 2 o 3 etc., and recover the hydrochloric acid obtained by evaporation, and use it in the leaching process of titanium-containing red mud for recycling. Take 100 parts by weight of the mixture, add 6 parts by weight of additives and 25 parts by weight of reducing agent, mix evenly, and press into blocks to obtain green balls. After the green balls are dried, reduction and melting treatment are carried out, the reduction temperature is controlled at 1200°C, the reduction time is 30 minutes, the melting temperature is 1500°C, and the melting time is 50 minutes to obtain molten iron and aluminum-ric...

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Abstract

The invention relates to a method for treating titanium-containing red mud. The method comprises the steps that after the titanium-containing red mud is leached through a hydrochloric acid solution, leaching residues and a leaching solution are obtained; and the treatment process of the leaching residues comprises the steps that the leaching residues are further leached by a sulfuric acid solution, and titanium dioxide is obtained through hydrolysis and roasting treatment. The treatment process of the leaching solution comprises the steps that the leaching solution is evaporated and roasted, a mixture is obtained, a reducing agent and an additive are added to the mixture, briquetting forming is conducted, a green ball is obtained, reduction and melt separation treatment are conducted on the green ball, and melt iron and aluminum-rich slag are obtained. By the adoption of the method for treating the titanium-containing red mud, effective separation and extraction of titanium, iron and aluminum can be achieved, the economic value of aluminum extraction from the aluminum-rich slag is increased, the energy consumption is lower, and the production cost is saved.

Description

technical field [0001] The invention relates to the field of solid waste treatment, in particular to a method for treating titanium-containing red mud. Background technique [0002] Red mud is the waste produced in the process of refining alumina from bauxite, and it is named for its red mud. Under normal circumstances, the average production of 1 ton of alumina will produce 1 to 2 tons of red mud by-product. With the rapid development of my country's and the global alumina industry, from 2005 to 2015, my country's alumina production has grown from 8.59 million tons per year to 58.98 million tons per year, and global alumina production has grown from 56.16 million tons per year to 124.71 million tons per year. 10,000 tons / year. The annual growth of alumina red mud in my country can reach more than 70 million tons, and the cumulative historical stockpile has exceeded 350 million tons. Red mud contains a large amount of iron, aluminum, sodium, calcium and other metals. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B1/248C22B34/12C22B21/02
CPCC22B1/02C22B1/2406C22B1/248C22B7/007C22B21/0023C22B21/02C22B34/1218C22B34/1245Y02P10/20
Inventor 王福佳古明远王敏吴佩佩王键月吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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