Titanium dioxide hydrolysis particle whitening agent and preparation method of titanium dioxide hydrolysis crystal seed

Abstract

The invention relates to a core technique for producing titanium dioxide powder through a sulfuric acid process, which successfully solves the problems that in the prior process for producing the titanium dioxide powder through the sulfuric acid process, a metatitanic acid obtained through hydrolysis has uneven sizes, wide particle distribution, irregular particle shapes, difficult washing and large water consumption. The invention discloses a titanium dioxide hydrolysis particle whitening agent, a hydrolysis crystal seed for producing the titanium dioxide powder and a preparation method of ahigh-quality metatitanic acid, wherein the whitening agent is a solution prepared by adding a water-soluble organic acid, a water-soluble zirconium salt and a water-soluble sulfate, a water-soluble hydrochloride or a water-soluble nitrate into water. The preparation method adopts a water-dispersible organic substance and an inorganic acid solution to control the water-soluble zirconium salt to form a regular spherical crystal nucleus during hydrolysis, and simultaneously inhibits the hydrolysis of colored impurities in a titanium solution to improve the purity, the whiteness and the brightness of the titanium dioxide powder.

Description

technical field [0001] The invention relates to a hydrolysis process for producing titanium dioxide by a sulfuric acid method, in particular to a preparation method of a titanium dioxide hydrolysis particle whitening agent and a titanium dioxide hydrolysis seed crystal. Background technique [0002] Titanium dioxide scientific name titanium dioxide (TiO 2 ), 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. Printing ink, chemical fiber, rubber, ceramics, cosmetics and food additives and medicine and other fields. At present, China's rutile titanium dioxide pigment is mainly produced by the sulfuric acid method. It is the acidolysis reaction of ilmenite, high-titanium slag and concentrated sulfuric acid to generate titanium liquid. After the titanium liquid is filtered and purified, it is hydrolyzed to generate metatitanic acid and metatitanium The acid ...

AI Technical Summary

Problems solved by technology

However, since titanyl sulfate contains a large amount of acid-soluble impurities (such as iron, vanadium, chromium, manganese, niobium, etc.), these acid-soluble impurities will be hydrolyzed at the same time to become impurity nuclei and mixed into hydrated titanium dioxide seeds, resulting in final hydrolysis. The size of the metatitanic acid is uneven, the particle distribution is wide, the particle shape is irregular, and the subsequent washing is difficult, and the water consumption is large; and during calcination, the too fine metatitanic acid particles are easy to be sintered, which affects the pigment index, and the excessively large particles It is not easy to complete the conversion of rutile, so that the composition of anatase titanium dioxide is relatively high, and the pigment index and performance are not easy to meet the requirements of high-grade rutile products

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