Preparation method of anatase titanium dioxide

Abstract

The invention discloses a preparation method of anatase titanium dioxide, and relates to the field of producing of materials. The preparation method of the anatase titanium dioxide comprises the following steps: mixing a preheated titanium oxide dichloride aqueous solution with a preheated base solution, cooling and separating after hydrolyzing, implementing salt treatment on the obtained anatasehydrated titanium dioxide, and calcining to obtain the anatase titanium dioxide; wherein the base solution is an aqueous solution containing soluble sulfate and soluble phosphate. The preparation method of the anatase titanium dioxide uses titanium oxide dichloride to generate a seed crystal and hydrolyze at the normal pressure, an anion coordination polyhedron is formed by controlling the contents of the sulfate radical and the phosphate radical in the base solution, the growing structure and the connecting mode of the hydrated titanium dioxide are changed, the anatase hydrated titanium dioxide is directly produced, the pure anatase titanium dioxide is obtained through calcining and dehydrating, the flow is simple, no induction period exists, the reaction time is short, the control is simple, and the industrial operation can be implemented.

Description

technical field [0001] This application relates to the field of material production, in particular, to a preparation method of anatase titanium dioxide. Background technique [0002] Titanium dioxide (TiO 2 ) is an important inorganic chemical product, which has important uses in industries such as coatings, inks, papermaking, plastics, rubber, chemical fibers, and ceramics. [0003] The common industrial production methods of titanium dioxide are sulfuric acid method and chlorination method. The sulfuric acid method is to use sulfuric acid to hydrolyze titanium-containing minerals to obtain a titanyl sulfate solution, which is purified and hydrolyzed to obtain hydrated titanium dioxide precipitates, and then fired in a brick kiln to produce titanium dioxide pigment products. There are many steps to discharge waste, crystal transformation requires many steps, and the incineration process used consumes a lot of energy. The chlorination method is to react ilmenite, high-tit...

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Problems solved by technology

The sulfuric acid method is to use sulfuric acid to hydrolyze titanium-containing minerals to obtain a titanyl sulfate solution, which is purified and hydrolyzed to obtain hydrated titanium dioxide precipitates, and then fired in a brick kiln to produce titanium dioxide pigment products. Steps, discharge more waste, crystal transformation requires multiple operation steps, and the incineration process used consumes a lot of energy

The chlorination method is to react ilmenite, high-titanium slag, artificial rutile or natural rutile with chlorine to generate titanium dichloride, which is purified by rectification, then gas-phase oxidation, and after rapid cooling, titanium dioxide is obtained through gas-solid separation. The requirements for raw materials are high, the corrosion resistance of equipment is also high, the technology is difficult, and generally only rutile titanium dioxide can be prepared, which limits its application range in chemical fiber, food and other industries

[0004] In the related field, the alkali solution is added to the titanium tetrachloride aqueous solution, and the anatase titanium dioxide is obtained through repeated neutralization, which consumes a large amount of lye but cannot recover hydrochloric acid, causing waste of resources and polluting the environment; the same method uses ammonia water to neutralize the tetrachloride Titanium, generating amorphous hydrated titanium dioxide to produce anatase titanium dioxide, there is also a corresponding waste of resources, etc.

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