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Clean method for preparing rutile-type titanium dioxide from high-titanium slag by hydrothermal method

A titanium dioxide, clean production technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high energy consumption, serious pollution, complex equipment and other problems in the production process, and achieves the improvement of product quality, huge economic benefits, alleviation The effect of environmental pressure

Inactive Publication Date: 2008-06-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of high energy consumption, serious pollution, large investment and complex equipment of the existing titanium dioxide industrial production process, thereby providing a high-titanium slag water with low energy consumption and good economic and environmental benefits. Clean production method for preparing rutile titanium dioxide by thermal method

Method used

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  • Clean method for preparing rutile-type titanium dioxide from high-titanium slag by hydrothermal method
  • Clean method for preparing rutile-type titanium dioxide from high-titanium slag by hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Circulate back to the 500g / L NaOH alkali solution in the reaction kettle, add 200 mesh high titanium slag and mix evenly under stirring, the mass ratio of NaOH and high titanium slag is 0.5:1, hydrothermal reaction at 180°C for 0.5 hours, to obtain hydrothermal reaction The product, the conversion rate of high titanium slag is 100%. Filtrating the reaction product to obtain a crude product containing sodium titanate and a concentrated solution of sodium hydroxide, the concentrated solution of sodium hydroxide can be used in the above steps for hydrothermal reaction after evaporation and dehydration;

[0028] The crude product of sodium titanate was washed twice with the recycled water, and the solid-to-liquid mass ratio of each wash was 1:40. The sodium titanate product obtained after filtration was added to the recycled sulfuric acid solution to dissolve it completely, and the solid-to-liquid ratio was 1:200, and then sodium sulfite was added to the solution. Finally,...

Embodiment 2

[0030] Circulate the 200g / L NaOH alkali solution back to the reactor, add 300 mesh high-titanium slag and mix evenly under stirring. The mass ratio of NaOH and high-titanium slag is 5:1, and conduct a hydrothermal reaction at 280°C for 10 hours to obtain a hydrothermal reaction The product, the conversion rate of high titanium slag is 99.0%. Filtrating the reaction product to obtain a crude product containing sodium titanate and a concentrated solution of sodium hydroxide, the concentrated solution of sodium hydroxide can be used in the above steps for hydrothermal reaction after evaporation and dehydration;

[0031] The crude product of sodium titanate is washed twice with the water returned by circulation, and the solid-to-liquid mass ratio of each washing is 1:10, and the sodium titanate product obtained after filtration is added to the hydrochloric acid solution returned by circulation, and the solid-to-liquid ratio is 1:50, and then Add iron filings to this mixture. Fina...

Embodiment 3

[0033] Circulate the 320g / L NaOH alkali solution back to the reactor, add 250 mesh high-titanium slag and mix evenly under stirring. The product, the conversion rate of high titanium slag is 99.4%. Filtrating the reaction product to obtain a crude product containing sodium titanate and a concentrated solution of sodium hydroxide, the concentrated solution of sodium hydroxide can be used in the above steps for hydrothermal reaction after evaporation and dehydration;

[0034] The crude product of sodium titanate is washed twice with the water returned by circulation, and the solid-to-liquid mass ratio of each washing is 1:20, and the sodium titanate product obtained after filtration is added to the nitric acid solution returned by circulation, and the solid-to-liquid ratio is 1:100, and then Sodium thiosulfate was added to the mixture. Finally, the mixed solution was hydrolyzed at 150° C. for 24 hours, the hydrolyzed product was filtered, and the obtained white solid was dried ...

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Abstract

The invention relates to a clean production method by high titanium slag hydrothermal method to prepare rutile titanium oxide. The method adopts high titanium slag as raw material and sodium hydroxide hydrothermal method to prepare the intermediate product of sodium titanate which is then separated from the solution and washed and hydrolyzed to obtain the rutile titanium oxide. The method of the invention adopts simple preparation technique to prepare the rutile TiO2, which spares high temperature calcination in the traditional technique; the conversion rate of titanium in the high titanium slag is of over 99.0 percent and the alkali circulation and the acid circulation are realized, which has good economic benefit and environmental benefit. Additionally, the sodium titanate which can be taken as the intermediate product for preparing titanium series obtained from the method is expected to have wide application.

Description

technical field [0001] The invention belongs to the technical field of mineral resources processing and utilization and preparation of inorganic functional materials, and in particular relates to a clean production method for preparing rutile-type titanium dioxide by hydrothermal method of high titanium slag. Background technique [0002] Titanium dioxide, commonly known as titanium dioxide, is a white inorganic pigment with non-toxicity, best opacity, best whiteness and brightness. It is considered to be a white pigment with the best performance in the world. It is widely used in coatings, plastics, Papermaking, printing ink, chemical fiber, rubber, cosmetics and other industries. [0003] There are two main industrial production methods of titanium dioxide: sulfuric acid method and chloride method. The sulfuric acid method is to carry out acidolysis reaction between ferrotitanium powder and concentrated sulfuric acid to generate titanyl sulfate, which is hydrolyzed to gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 章永洁齐涛初景龙王丽娜曲景奎张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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