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Method for preparing high-purity TiO2 from titanium concentrates through oxygen-enriched selective leaching

A titanium concentrate and selective technology, applied in the field of oxygen-enriched selective leaching of titanium concentrate to prepare high-purity TiO2, can solve the problems of high equipment requirements, difficult separation of impurities, increased water consumption in the washing process, etc., and achieve the goal of optimizing dynamic conditions Effect

Active Publication Date: 2018-07-20
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method consumes too much alkali, the reaction temperature is high, and the equipment requirements are relatively high. Due to the high alkalinity, the water consumption in the washing process is greatly increased, and the separation of impurities is difficult, and the potassium content in the produced titanium dioxide is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Crush the titanium concentrate to a particle size of ≤0.125mm, complete the activation treatment, and obtain titanium concentrate powder; place the titanium concentrate powder in an autoclave for alkaline leaching with a sodium hydroxide solution, wherein the mass concentration of the sodium hydroxide solution is 20 %, the ratio of sodium hydroxide solution to vanadium-titanium concentrate powder is 15:1 according to the liquid-solid ratio; first feed oxygen into the autoclave, then heat up to 180 ° C, keep warm for 3 hours under stirring conditions, and complete the alkali leaching; The material after alkali leaching is filtered and separated to obtain alkali decomposition products and alkali leaching solution; the alkali decomposition products are washed with water until the filtrate is neutral to make alkali decomposition slag; the alkali leaching solution uses CaO as a precipitant to remove SiO 2 , when SiO in liquid phase 2 After the mass percentage of ≤0.05%, it c...

Embodiment 2

[0044] Method is with embodiment 1, and difference is:

[0045] (1) The weight concentration of the sodium hydroxide solution is 30%, and the ratio of the sodium hydroxide solution to the vanadium-titanium magnetite powder is 10:1 according to the liquid-solid ratio; the alkali leaching temperature is 220°C, and the time is 2h;

[0046] (2) the mass concentration of hydrochloric acid is 18%, and the ratio of hydrochloric acid and alkali decomposition slag is 8:1 by liquid-solid ratio; Crystal seed is titanium dioxide, and add-on is 0.3% of alkali decomposition slag gross weight; 150℃, time 2h;

[0047] (3) Concentrate the hydrochloric acid produced by atomizing and absorbing hydrogen chloride gas to a mass concentration of 18%; wash and dry the acid leaching residue and then calcinate at 850°C for 40min; rutile type high-purity TiO 2 Contains TiO by mass percentage 2 99.17%, SiO 2 0.08%,

[0048] CaO2 o 3 0.02, Mn<0.05%, S<0.05%.

Embodiment 3

[0050] Method is with embodiment 1, and difference is:

[0051] (1) The weight concentration of sodium hydroxide solution is 40%, and the ratio of sodium hydroxide solution and vanadium-titanium magnetite powder is 5:1 by liquid-solid ratio; Alkali leaching temperature is 300 ℃, time 1h;

[0052] (2) the mass concentration of hydrochloric acid is 20%, and the ratio of hydrochloric acid and alkali decomposition slag is 10:1 by liquid-solid ratio; 0.2%; pickling hydrolysis temperature 180 ℃, time 1h;

[0053] (3) Concentrate the hydrochloric acid produced by atomizing and absorbing hydrogen chloride gas to a mass concentration of 20%; wash and dry the acid leaching residue and then calcinate at 800°C for 60 minutes; rutile type high-purity TiO 2 Contains TiO by mass percentage 2 99.52, SiO 2 0.05%, CaO2 o 3 0.01%, Mn<0.05%, S<0.05%.

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Abstract

A method for preparing high-purity TiO2 from titanium concentrates through oxygen-enriched selective leaching comprises the following steps that (1) the titanium concentrates are broken, activated andplaced in an autoclave to be subjected to alkaline leaching through a sodium hydroxide solution, before alkaline leaching, oxygen is led into the autoclave firstly, and then heating and stirring areconducted; (2) filtering separation is conducted, and an alkaline decomposition product is washed to be prepared into alkaline decomposition slag materials; (3) the alkaline decomposition slag materials are subjected to acid leaching and hydrolyzation, seed crystals are added firstly, and then heating and stirring are conducted; and (4) filtering separation is conducted, acid-leached slag is washed and dried and then calcinated at 800-900 DEG C, and the rutile-type high-purity TiO2 is prepared. According to the method, the high-property material is easy to prepare, resource recycling is achieved, and energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metallurgy, in particular to an oxygen-enriched selective leaching titanium concentrate to prepare high-purity TiO 2 Methods. Background technique [0002] The content of titanium accounts for about 0.61% of the mass of the earth's crust. Arranged according to the abundance of elements in the earth's crust, it is the fourth structural metal after aluminum, iron, and magnesium; its chemical properties are active, and there is no elemental state in nature. Salts and other compounds widely exist in seawater, soil, rocks, animals and plants. Although there are many titanium-containing minerals, ilmenite, vanadium-titanium magnetite and rutile ore are mainly used in industry at present; among the titanium-containing minerals in the earth's crust, the most widely distributed and the largest reserves are ilmenite, accounting for About 80% of titanium ore resources are also the main raw materials fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/12C22B3/12C22B3/10
CPCC22B34/1245C22B34/1254Y02P10/20
Inventor 豆志河张廷安刘燕张子木王艳秀
Owner NORTHEASTERN UNIV
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