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Method for preparing artificial rutile

An artificial rutile and rutile technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high fine powder rate, complicated process, high cost, etc., and achieve less impurity content, simple process flow and low fine powder rate Effect

Active Publication Date: 2012-11-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of high product fine powder rate, complicated process, high energy consumption and high cost in the existing method for preparing artificial rutile, and propose a method for preparing artificial rutile by inducing crystallization hydrochloric acid to directly leach titanium concentrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The Panzhihua titanium concentrate was reduced for 45 minutes at 800°C in a CO reducing atmosphere, and ball milled for 45 minutes after cooling. Then the ball-milled titanium concentrate was leached with 20wt% hydrochloric acid solution at a temperature of 105°C, and at the same time, rutile fine powder accounting for 2.5% by weight of the titanium concentrate was added as a seed crystal. The seed crystal is a rutile hydrolyzate obtained by leaching titanium concentrate with hydrochloric acid. After acid leaching for 12 hours, the slurry was filtered, washed and dried, and the obtained solid was finally calcined in an air atmosphere at 800°C for 1 hour to obtain artificial rutile. TiO in the product 2 The content is 92%, and the pass rate of 800 mesh sieve (pore size 18μm) is 2.0%.

Embodiment 2

[0046] The Panzhihua titanium concentrate was reduced in a reducing atmosphere at 850°C for 1 hour, and after cooling, it was leached with 20wt% hydrochloric acid solution at a temperature of 130°C. Add rutile fine powder accounting for 1.5% by weight of titanium concentrate to the leaching solution as a seed crystal. This seed crystal is the rutile hydrolyzate obtained by leaching titanium concentrate with hydrochloric acid. After acid leaching for 6 hours, the slurry was filtered, washed and dried, and the resulting solid was finally calcined in an air atmosphere at 750°C for 1 hour to obtain artificial rutile. TiO in the product 2 The content is 94%, and the pass rate of 800 mesh sieve (pore size 18μm) is 1.0%.

Embodiment 3

[0048] The Panzhihua titanium concentrate was reduced in a reducing atmosphere at 750°C for 2.5 hours, and after cooling, it was leached with 25wt% hydrochloric acid solution at a temperature of 95°C. Add rutile fine powder accounting for 2.0% by weight of titanium concentrate to the leaching solution as a seed crystal. The seed crystal is a fine powder obtained from the rutile hydrolyzate obtained by leaching titanium concentrate with hydrochloric acid, and then calcined at 500°C. After acid leaching for 8 hours, the slurry was filtered, washed and dried, and the resulting solid was finally calcined in an air atmosphere at 700°C for 1 hour to obtain artificial rutile. TiO in the product 2 The content is 93%, and the passing rate of 800 mesh sieve (aperture 18μm) is 1.0%.

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Abstract

The present invention relates to a method for preparing artificial rutile. The artificial rutile is prepared by titanium concentrate reduction by hydrochloric acid leaching; and rutile crystal seeds are added in the process of titanium concentrate acid leaching treatment. The method comprises steps of: first, conducting reduction roasting on the titanium concentrate; cooling and carrying out hydrochloric acid leaching; while adding rutile crystal seeds; and carrying out filtration, washing, drying and calcining on the slurry obtained from hydrochloric acid leaching to obtain the artificial rutile. The invention is applicable to preparation of artificial rutile from high calcium magnesium titanium concentrate in Panzhihua. The prepared artificial rutile product has high grade, low fine powder rate and low impurity content, and can better meet the requirements of a boiling chlorination process.

Description

technical field [0001] The invention relates to the technical field of chemical metallurgy, in particular to a method for preparing artificial rutile. Background technique [0002] Titanium tetrachloride (TiCl) prepared by boiling titanium-rich materials such as artificial rutile and high-titanium slag 4 ), is the direct raw material for producing sponge titanium, titanium materials and titanium alloys. my country's titanium resources are concentrated in Panzhihua, Sichuan, with abundant reserves. However, since the calcium and magnesium content in Panzhihua titanium concentrate is as high as 7-11%, molten CaCl will be formed under chlorination conditions. 2 , MgCl 2 , to destroy boiling chlorination to produce TiCl 4 boiling state of the process. Therefore, it is necessary to use hydrochloric acid leaching to remove Ca, Mg, and Fe impurities in titanium concentrate to obtain high-grade titanium-rich materials. However, a large amount of TiO will be produced during the ...

Claims

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Application Information

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IPC IPC(8): C01G23/047
Inventor 谢朝晖朱庆山
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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