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

A titanium dioxide and clean production technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high energy consumption, complex equipment and serious pollution in the production process, so as to help improve product quality, reduce energy consumption, and greatly reduce energy consumption. economic effect

Inactive Publication Date: 2010-10-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • 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 the 500g / L NaOH alkali solution back to the reactor, add 200 mesh high-titanium slag and mix evenly under stirring. The mass ratio of NaOH to high-titanium slag is 0.5:1, and hydrothermally react at 180°C for 0.5 hours to obtain a 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 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 add sodium sulfite to the solution. Finally, the solution was ...

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 to high-titanium slag is 5:1, and hydrothermally react 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 was washed twice with recycled water, and the solid-to-liquid mass ratio of each washing was 1:10. The sodium titanate product obtained after filtration was added to the recycled hydrochloric acid solution, and the solid-to-liquid ratio was 1:50, and then Add iron filings to this mixture. Finally, the mixed solution was hydrolyzed at 150°...

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 mass ratio of NaOH to high-titanium slag is 3.8:1, and hydrothermally react at 240°C for 4 hours to obtain a hydrothermal reaction 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 was washed twice with recycled water, and the solid-to-liquid mass ratio of each wash was 1:20, and the sodium titanate product obtained after filtration was added to the recycled nitric acid solution, with a solid-to-liquid ratio of 1:100, and then Sodium thiosulfate was added to the mixture. Finally, the mixed solution was hydrolyzed a...

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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 Patents(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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