High-purity ultra-fine titanium dioxide prepared from industrial metatitanic acid and preparation method of titanium dioxide

Abstract

The invention relates to a preparation method of titanium dioxide, in particular to a method for preparing high-purity ultra-fine titanium dioxide by industrial metatitanic acid. The method includes the steps: a, beating dispersion: washing and bleaching hydrolyzed metatitanic acid, adding water for dilution, performing beating and ultrasonic dispersion to obtain slurry, adding dispersing agents into the slurry and performing dispersion to obtain metatitanic acid slurry; b, curing: curing the metatitanic acid slurry, cooling the metatitanic acid slurry to 60-70 DEG C, and filtering and washing the metatitanic acid slurry until ferrous ions are removed to obtain a purified metatitanic acid filter cake; c, calcining: adding water to the metatitanic acid filter cake, performing ultrasonic dispersion and calcining, cooling the filter cake to room temperature, and crushing and grinding the filter cake to obtain the titanium dioxide. By the aid of an impurity ion occurrence form in hydrolyzed metatitanic acid particles and composition and structural characteristics of the metatitanic acid, the high-purity ultra-fine titanium dioxide is directly prepared by dispersion, washing, curing, calcining and the like, new varieties of the titanium dioxide can be increased, product application can be functionalized, and the method has a wide application prospect.

Description

technical field [0001] The invention relates to a method for preparing titanium dioxide, in particular to a method for preparing high-purity ultrafine titanium dioxide from industrial metatitanic acid. Background technique [0002] Titanium dioxide has stable physical and chemical properties. It is usually produced in the anatase or rutile crystal form. Because of its excellent optical properties, chemical inertness and high refractive index, it is usually the first choice for white pigments and is widely used in coatings and plastics. , paper, ink, rubber, fiber, ceramics, food additives and many other fields. At the same time, titanium dioxide has semiconductor properties, high dielectric constant and resistivity, and excellent mechanical and electrical properties. Strontium varistors, functionalized titanium dioxide and titanium metal are widely used, and the demand has increased year by year in recent years. [0003] At present, the methods for preparing high-purity ul...

AI Technical Summary

Problems solved by technology

The titanium alkoxide hydrolysis method has less "three wastes", good product quality, and good process repeatability, but the process is long, there are many hidden safety hazards in production, and the price of auxiliary materials is high, so it is only suitable for laboratory preparation

The direct hydrolysis of titanium tetrachloride has a short process flow and good product quality, but requires high quality raw materials and high production costs

This patent is for the preparation of pigment titanium dioxide, because it needs to add other salts (calcination aids) to reduce its purity, and there are also disadvantages such as high cost and complicated process.