High-purity titanium sesquioxide preparation method

Abstract

The invention discloses a high-purity titanium sesquioxide preparation method which comprises the steps of: mixing a titanium sesquioxide raw material with water, stirring, smashing, precipitating, drying and then smashing dry powder, wherein the concentration of a mixed solution of the titanium sesquioxide raw material and the water is 10 to 30%; in stirring, a pH value of a titanium sesquioxideraw material and dilute sulphuric acid solution is adjusted to 6.5 to 7.5; smashing after stirring and before precipitating is the smashing by a wet method smashing machine. The preparation method further comprises the step of performing classified separation treatment on the titanium sesquioxide raw material and dilute sulphuric acid solution at least twice, wherein the particle diameter of the titanium sesquioxide is between 0.35 and 0.5 mu m after primary classified separation treatment is performed on the titanium sesquioxide raw material and dilute sulphuric acid solution; the particle diameter of the titanium sesquioxide is between 0.2 and 0.35 mu m after secondary classified separation treatment. The preparation method comprises the step of performing surface treatment on the titanium sesquioxide raw material and dilute sulphuric acid solution subjected to precipitation, wherein a surface treating agent is dimethyl silicone. According to the preparation method disclosed by the invention, crude-fine secondary separation is utilized, so that a separation effect is ideal, the titanium sesquioxide yield can reach 98%, the preparation method is at an advanced level of the same industry at home and abroad, and product quality is stable.

Description

technical field [0001] The invention relates to a preparation method of dititanium trioxide, in particular to a preparation method of high-purity dititanium trioxide. Background technique [0002] High-purity titanium dioxide is a matting additive used in the production of chemical fiber industry. Since the 1960s, my country's high-purity titanium dioxide has relied on imports from Japan and Germany, and the annual demand has grown from several thousand tons to 35,000 tons. Ton. In recent years, many domestic titanium dioxide manufacturers and scientific research institutes have conducted research on the production of high-purity titanium dioxide, and have achieved some research results. At present, the method for domestic production of high-purity titanium dioxide, such as the Chinese invention patent "a method for preparing chemical fiber grade titanium dioxide" as the patent No. 00119513.1, the disclosed method of producing high-purity titanium dioxide is : Using ordinar...

AI Technical Summary

Problems solved by technology

Due to the poor separation effect of this method for producing high-purity titanium dioxide, the particles of high-purity titanium dioxide produced have a relatively high specific gravity of less than 0.2 μm, and it is easy for users to cause problems during spinning operations. broken wire