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Method for recovering titanium from red mud leachate

A technology for leaching liquid and recovering titanium, which is applied in the direction of improving process efficiency, etc., can solve problems such as complex process and difficult separation of titanium, and achieve the effects of simple operation, increased hydrolysis rate, and environmental friendliness

Inactive Publication Date: 2021-07-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature (Zhu Guohai, Wang Keqin, Wang Hao, etc. Nonferrous Metals (Smelting Part), 2012, 7:23-26) reported that sulfuric acid was used to leaching red mud slag to recover titanium dioxide, and then obtain titanium dioxide products through multi-stage extraction-back extraction, hydrolysis and calcination , but there are problems such as complex process and difficult separation of titanium in this process, it is urgent to develop a short process with simple process and high recovery rate of titanium

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  • Method for recovering titanium from red mud leachate

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Embodiment 1

[0038] This embodiment provides a method for recovering titanium from red mud leachate, the method comprising the following steps:

[0039] (1) Mix the heated 1000mL red mud leaching solution with 2.76g iron powder, and the Fe in the red mud leaching solution 3+ reduced to Fe 2+ , the reduction temperature is 65°C and the time is 120min;

[0040] (2) Using ammonia water to adjust the pH of the red mud leachate after reduction in step (1) to 1.8;

[0041] (3) Heating the red mud leaching solution after the pH adjustment in step (2), adding metatitanic acid seed crystals at 100°C for 180 minutes of reaction, the concentration of metatitanic acid crystals added is 10g / L, and solid-liquid separation obtains filtrate and Metatitanic acid;

[0042] (4) Calcining the metatitanic acid obtained in step (3) at 500° C. for 60 minutes to obtain titanium dioxide.

[0043] Among them, the above-mentioned red mud leachate contains 5.44g / L aluminum, 2.01g / L titanium, 5.51g / L iron, 3.14g / L...

Embodiment 2

[0047] This embodiment provides a method for recovering titanium from red mud leachate, the method comprising the following steps:

[0048] (1) Mix the heated 1000mL red mud leaching solution with 4.14g iron powder, and the Fe in the red mud leaching solution 3+ reduced to Fe 2+ , the reduction temperature is 70°C and the time is 120min;

[0049] (2) Using ammonia water to adjust the pH of the red mud leachate after reduction in step (1) to 2.0;

[0050] (3) Heating the red mud leaching solution after pH adjustment in step (2), adding metatitanic acid seed crystals at 100°C for 150 minutes of reaction, the concentration of metatitanic acid crystals added was 15g / L, and solid-liquid separation obtained filtrate and Metatitanic acid;

[0051] (4) Calcining the metatitanic acid obtained in step (3) at 500° C. for 60 minutes to obtain titanium dioxide.

[0052] Among them, the above-mentioned red mud leachate contains 5.44g / L aluminum, 2.01g / L titanium, 5.51g / L iron, 3.14g / L s...

Embodiment 3

[0056] This embodiment provides a method for recovering titanium from red mud leachate, the method comprising the following steps:

[0057] (1) Mix the heated 1000mL red mud leaching solution with 1.38g iron powder, and the Fe in the red mud leaching solution 3+ reduced to Fe 2+ , the reduction temperature is 60°C and the time is 90min;

[0058] (2) using ammonia water to adjust the pH of the red mud leachate after reduction in step (1) to 1.6;

[0059] (3) Heating the red mud leaching solution after pH adjustment in step (2), adding metatitanic acid seed crystals at 100°C for reaction for 240 minutes, the concentration of metatitanic acid crystals added is 5g / L, and solid-liquid separation obtains filtrate and Metatitanic acid;

[0060] (4) Calcining the metatitanic acid obtained in step (3) at 400° C. for 120 minutes to obtain titanium dioxide.

[0061] Among them, the above-mentioned red mud leachate contains 5.44g / L aluminum, 2.01g / L titanium, 5.51g / L iron, 3.14g / L sod...

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Abstract

The invention provides a method for recovering titanium from red mud leachate. The method for recovering the titanium from the red mud leachate comprises the following steps of (1) mixing the heated red mud leachate with a reducing agent, and reducing Fe < 3 + > in the red mud leachate into Fe < 2 + >; (2) regulating the pH value of the red mud leachate reduced in the step (1) by using a pH regulator; and (3) heating the red mud leachate with the pH adjusted in the step (2), adding metatitanic acid seed crystals for reaction, and performing solid-liquid separation to obtain filtrate and metatitanic acid. According to the method for recovering the titanium from the red mud leachate, obtained titanium dioxide is low in impurity content, low in energy consumption, free of pollution, simple in process, easy to control in process and good in economic benefit.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and in particular relates to a method for recovering titanium from red mud leachate. Background technique [0002] Red mud is a solid waste produced during the production of alumina. It is red because it contains a large amount of iron oxide, so it is called red mud. Due to differences in ore grade, production process and technical level, 1.0-1.5 tons of red mud will be discharged for every ton of alumina produced. According to statistics, the cumulative amount of red mud stockpiled in the world exceeds 4 billion tons, and the amount of newly generated red mud reaches 120 million tons every year. my country is a big country in the alumina industry, and the amount of red mud discharged every year is 70-90 million tons. Due to the limitation of technical conditions, the main disposal method of red mud is damming and stockpiling. However, stockpiling and disposal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/12
CPCC22B7/006C22B34/1259Y02P10/20
Inventor 刘宏辉雷炳宏张笛董玉明庆朋辉徐红彬
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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