Method for preparing gypsum whiskers from titanium dioxide waste acid by microwave hydrothermal method

Abstract

The invention discloses a method for preparing gypsum whiskers from titanium dioxide waste acid by using a microwave hydrothermal method. The method comprises the following steps: S1, preparing a neutralizing agent; s2, carrying out microwave heating on the titanium dioxide waste acid, adding magnesium chloride into the titanium dioxide waste acid, and simultaneously adding any one or more of glycerol and sodium dodecyl benzene sulfonate; s3, under the stirring condition, slowly dropwise adding a neutralizer into the magnesium chloride system for neutralization reaction; s4, after the neutralization reaction, continuously stirring, carrying out suction filtration on a reaction system, and drying filter residues to obtain gypsum whiskers; according to the method, the gypsum whiskers are prepared by taking the titanium dioxide waste acid as a raw material through a microwave hydrothermal method, and adding the glycerol / SDBS additive into a reaction system, so that the growth rate of gypsum crystals is changed, the granularity of the gypsum crystals is increased, and the high-quality gypsum whiskers are prepared.

Description

technical field [0001] The invention relates to the field of treatment of titanium dioxide acid waste water, in particular to a method for preparing gypsum whiskers from titanium dioxide waste acid by using a microwave hydrothermal method. Background technique [0002] Titanium dioxide (TiO2) is relatively pure white in color, brighter under the reflection of light, non-toxic, heat-resistant, high in coverage and soft in texture. It is an inorganic white with excellent performance recognized in the world Pigment is also a very important chemical raw material, which is widely used in rubber, paper, plastic, paint, metallurgy, chemical fiber and other industrial fields. There are two methods of producing titanium dioxide in industry: (1) sulfuric acid method; (2) chlorination method. The chlorination method is not widely used in my country. Only a few titanium dioxide factories use the chlorination method for production, and most of the remaining factories use the sulfuric ac...

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Problems solved by technology

[0006] It is not difficult to see from the chemical reaction equation that H 2 SO 4 It is only used as the intermediate medium of the reaction in the whole process flow, but does not enter the final product. Most of the waste acid is produced from acidolysis, water washing and hydrolysis sections. 2 SO 4 High-concentration waste acid, waste water from washing tail gas during acidolysis, waste water from water washing (primary washing, bleaching, secondary washing), washing water from equipment (such as filter, leaf filter, vacuum crystallizer) in other processes , the H in these wastewater 2 SO 4 The concentration is low (<5%), waste gas and waste residue are generated in the whole process, and the cost of comprehensive treatment is relatively expensive

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