Method for producing gtitanium dioxide with sulphuric acid method

Abstract

The invention relates to a method for preparing titanium dioxide by a sulfuric acid method, belonging to the field of smelting. The method for preparing titanium dioxide by the sulfuric acid method of the present invention is characterized in that the acid waste water generated in the preparation process is neutralized by adding sodium hydroxide or potassium hydroxide, and the sulfate produced by neutralization is electrolyzed to generate concentrated sulfuric acid. This treatment method avoids the production of a large amount of gypsum. At the same time, the neutralized sulfate can be sold as a by-product, and the concentrated sulfuric acid generated by sulfate electrolysis can be applied again to the sulfuric acid method to prepare titanium dioxide. The problem of acid wastewater treatment and gypsum landfill has also realized the utilization of by-products. At the same time, electrolysis will also produce by-products such as hydrogen, oxygen, and hydroxide. Hydroxide can be used to neutralize acid wastewater. The method not only reduces the discharge of pollutants, but also realizes the recycling of waste water and achieves the purpose of energy saving and efficiency enhancement.

Description

technical field [0001] The invention relates to a method for preparing titanium dioxide by a sulfuric acid method, belonging to the field of smelting. Background technique [0002] Titanium dioxide has great application value in various fields. It is widely used in the manufacture of coatings, high-grade white paint, white rubber, synthetic fibers, welding electrodes, etc. It is also used in communication equipment, metallurgy, printing, printing and dyeing, enamel and other industries. [0003] The existing preparation of titanium dioxide has the chloride method and the sulfuric acid method: [0004] The chlorination method is to mix rutile or high-titanium slag powder with coke, and then perform high-temperature chlorination to generate titanium tetrachloride, which is oxidized at high temperature to generate titanium dioxide, and then filtered, washed, dried, and crushed to obtain titanium dioxide products. The process is short, the production capacity is easy to expand,...

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the serious pollution problem of titanium dioxide prepared by the existing sulfuric acid method and provide a new preparation method

This treatment method avoids the production of a large amount of gypsum. At the same time, the neutralized sulfate can be sold as a by-product, and the concentrated sulfuric acid generated by sulfate electrolysis can be used again in the preparation of titanium dioxide by the sulfuric acid method, which not only solves the problems in the sulfuric acid method The problem of acid wastewater treatment and gypsum landfill has also realized the utilization of by-products. At the same time, electrolysis will also produce by-products such as hydrogen, oxygen, and hydroxide. Hydroxide can be used to neutralize acid wastewater

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