Preparation of white titanium pigment double action crystal seed from metatitanic acid

Abstract

The invention relates to a preparation of white titanium pigment double action crystal seed from metatitanic acid, which is characterized in the process of (1) alkali dissolving, boiling the metatitanic acid purified by water washing with thermokalite; (2) water washing, removing residue sodium hydroxide and generated sodium sulfate thereby; (3) neutralizing and acid dissolving, neutralizing by hydrochloric acid and acid solution; (4) peptizing to generate a seed suspension, evaporating the suspension at a temperature from 105 to 300 DEG C., grinding, measuring the rutile microcrystalline withweight percentage over 90-98% by a X-ray diffractometer. The preparation uses metatitanic acid produced during sulphuric acid production process as raw material, adopts sol-gel process, with the produced rutile microcrystalline is safe and non-toxic, simple and easy to get raw material, low in cost, thus capable of evidently improving quality of product, enhancing stability of product quality andmarket competitiveness.

Description

technical field [0001] The invention relates to a double-effect crystal seed to be used in the production of sulfuric acid rutile titanium dioxide, in particular to a preparation method for producing titanium dioxide double-effect crystal by using metatitanic acid, which belongs to the field of chemical synthesis. Background technique [0002] The industrial production methods of titanium dioxide mainly include sulfuric acid method and chlorination method. In the production of sulfuric acid method rutile titanium dioxide, two kinds of crystal seeds need to be used, namely, hydrolysis seed crystal and calcined crystal seed, which are respectively used in the production of rutile titanium dioxide. There are two core processes, namely the hydrolysis process of titanium liquid and the calcination process of metatitanic acid. In the hydrolysis process, the hydrolysis seed acts as the crystallization center of the pigment crystal and induces the hydrolysis reaction, which largely ...

AI Technical Summary

Problems solved by technology

In the current traditional production process, these two kinds of crystal seeds are prepared in two production stations respectively, and added to react separately, but there are the following problems: 1. The seeds need to be produced separately in two processes, the process is complicated, and the operation is cumbersome , easy to cause fluctuations in product quality

2. The product has a high calcination temperature, a long time, and is easy to sinter. To obtain a high rutile conversion rate, more seeds must be used, which increases the production cost

3. After adding calcined seeds, the washing speed of the next process is slow and the efficiency is low

[0003] Some foreign titanium dioxide production enterprises have developed the process of using titanium tetrachloride as raw material to produce double-effect seed crystals, but because titanium tetrachloride is a dangerous chemical, there are many problems in transportation, storage and use. Complicated, high production cost, difficult to popularize; Chinese patent application such as publication number: CN1415548A, titled "Method for producing rutile titanium dioxide with double-effect seed crystal method", contains SnO in its crystal seed 2 Composition, then cooperate with Zn2+, k+, SnO 2 accounted for TiO 2 content of 4-7%, so that TiO 2 From the anatase phase to the rutile phase quickly at low temperature, but due to various technical and cost reasons, it has been difficult to put into practical application for many years

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