Cover type defoamer and acidolysis process for preparing titanium white powder by sulfuric acid method

Abstract

The invention discloses a cover type defoamer with a defoaming function. The cover type defoamer comprises a seal cover piece provided with a gas releasing opening and a plurality of compressed gas defoaming spray guns arranged on the seal cover piece, wherein nozzles of the compressed gas defoaming spray guns point to a reaction vessel matched with the seal cover piece. By using the cover type defoamer, an acidolysis process for preparing titanium white powder by an improved sulfuric acid method comprises the following steps of: a, uniformly mixing a titanium raw material and concentrated sulfuric acid in an acidolysis pot and adding starting water to initiate a main reaction; b, starting the compressed gas defoaming spray guns in the cover type defoamer; and c, shutting off the compressed gas defoaming spray guns after the main reaction is finished. In the cover type defoamer, foams in the reaction vessel are broken by the impact effect of compressed gas, and the foams are broken forcibly to release a large quantity of gases, so that the defoamer can be used for restraining the increase of foam volume, has a defoaming effect and is suitable for a plurality of types of acidolysisprocesses.

Description

Technical field [0001] The application relates to a defoaming device for eliminating foam generated in a reaction vessel. [0002] This application also relates to an improved acid hydrolysis process for preparing titanium dioxide by the sulfuric acid method after using the above-mentioned defoaming device. Background technique [0003] In the production industry that uses sulfuric acid to prepare titanium dioxide, the preparation of titanium solution is usually carried out in an acid hydrolysis pot. The main reaction of titanium raw material and concentrated sulfuric acid in the acid hydrolysis pot will produce a large amount of foam instantly. In order to prevent the foam from taking the risk of the pot without affecting the normal acid hydrolysis process, the current suitable method can only be to reduce each batch of titanium. The amount of raw materials or defoamer added. However, reducing the input of titanium raw materials will reduce the productivity per unit time, and ad...

AI Technical Summary

Problems solved by technology

The main reaction process of mixing titanium raw materials and concentrated sulfuric acid in the acidolysis pot will generate a large amount of foam instantly. In order to prevent the risk of foam from appearing in the pot without affecting the normal acidolysis process, the current appropriate method is to reduce the amount of titanium per batch. Input amount of raw materials or adding defoamer

However, reducing the input of titanium raw materials will reduce the production capacity per unit time, and adding defoamers will increase production costs, and the defoaming effect is not good, and there are certain safety hazards

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