Method for producing rutile type titanium white powder with high hiding power

Abstract

The invention discloses a method for producing rutile type titanium white powder with high hiding power, which comprises the following steps of: preparing slurry containing a primary titanium dioxide product, diluting the slurry, adding a silicon-containing compound into the slurry, then adding the silicon-containing compound and an acid aluminum-containing compound into the mixture, and performing ageing, filtration, water washing, drying, crushing and the like. The adding order, adding mode, adding quantity and the like of each coating agent are controlled by fine processes, and process and parameter conditions of each operation step are strictly controlled at the same time so that the added coating agents are deposited on the surfaces of titanium white powder particles in forms of compact silicon dioxide coating layers, loose silicon dioxide coating layers and alumina coating layers; and the hiding power of a titanium white powder product is improved and the characteristics such as high whiteness and the like and basic weather resistance of the titanium white powder product are kept by combining the processes of ageing, filtration, water washing, drying, crushing and the like.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide production, in particular to a production method of high-hiding rutile titanium dioxide. Background technique [0002] Titanium dioxide pigment is the best white pigment. It has the advantages of high whiteness, high opacity, stable physical and chemical properties, etc. It is widely used in coatings, plastics, papermaking and other industries. [0003] In the field of coating applications, the hiding power of titanium dioxide is related to the difference between the refractive index of the pigment and the resin, the greater the difference, the higher the hiding power. Since hydrated silica has the lowest refractive index, the introduction of hydrated silica during the surface treatment of titanium dioxide can increase the refractive index difference, and coating a large amount of hydrated silica can also maximize the individual titanium dioxide The particles are isolated from each other...

AI Technical Summary

Problems solved by technology

[0008] The inventor found in long-term experimental research and production practice that the introduction of appropriate silicon dioxide and aluminum oxide can indeed improve the hiding power of titanium dioxide, but the refractive index of the silicon dioxide film produced by the above-mentioned patent methods in an alkaline environment Higher without maximizing the hiding power of TiO2

Moreover, simply adding silica and alumina ingredients to the titanium dioxide slurry may not necessarily achieve good hiding power; Details such as control, all significantly affect the hiding power of the product titanium dioxide; inappropriate addition sequence and amount, or inappropriate process parameters, can not achieve the desired effect of improving the hiding power