A kind of oxygen-enriched selective leaching titanium concentrate to prepare high-purity tio 2 Methods

A titanium concentrate and selective technology, which is applied in the field of oxygen-enriched selective leaching of titanium concentrate to prepare high-purity TiO2, can solve the problems of large alkali consumption, high equipment requirements, and difficult impurity separation, and achieve an increase in impurity removal rate, The effect of reducing impurity removal pressure and optimizing dynamic conditions

Active Publication Date: 2020-10-16
NORTHEASTERN UNIV LIAONING
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  • 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 40 minutes; 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 the sodium hydroxide solution is 40%, and the ratio of the sodium hydroxide solution to the vanadium-titanium magnetite powder is 5:1 according to the liquid-solid ratio; the alkali leaching temperature is 300°C, and the time is 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 by selectively leaching from titanium concentrate with rich oxygen, comprising the following steps: (1) crushing and activating titanium concentrate, placing the raw materials in an autoclave for alkali leaching using a sodium hydroxide solution; introducing oxygen into the autoclave before the alkali leaching, and then heating and stirring; (2) performing filtration and separation, and washing the alkali decomposition product with water to prepare an alkali decomposition residue; (3) performing acid leaching on the alkali decomposition residue and hydrolyzing same, adding seed crystal, and then the heating and stirring; (4) performing filtration and separation, washing the acid leaching residue with water, drying said residue and calcining same at 800-900°C so as to prepare rutile-type high-purity TiO2. According to the method, high-performance materials can be prepared easily; resource recycling can be achieved; the energy can be saved; and the emission can be reduced.

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 Patents(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 LIAONING
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