Preparation method of trivalent titanium solution

Abstract

The invention discloses a preparation method of a trivalent titanium solution, and belongs to the field of production of titanium dioxide. According to the preparation method disclosed by the invention, the production cost can be reduced. The preparation method of the trivalent titanium solution comprises the following steps: a) concentrating an alkaline bath washing solution in a process of producing TiO2 by a sulfuric acid method to prepare heavy paste with the TiO2 concentration of not less than 270g / L; b) mixing the heavy paste obtained by the step a) with sulfuric acid, and heating for realizing full reaction; and c) adding a reducing agent into materials after full reaction in the step b), and reducing quadrivalent titanium to trivalent titanium to obtain the trivalent titanium solution. According to the preparation method disclosed by the invention, the alkaline bath washing solution is utilized as a raw material, so that the production cost can be reduced; simultaneously, supernatant liquor obtained by concentration can be used for spraying calcination tail gas, so that the alkaline bath washing solution can be fully utilized; and furthermore, the prepared trivalent titanium solution can meet the production needs of rutile type titanium dioxide by the sulfuric acid method.

Description

technical field [0001] The invention belongs to the field of titanium dioxide production, and in particular relates to a method for preparing a trivalent titanium solution. Background technique [0002] In the production process of sulfuric acid rutile titanium dioxide, the slurry obtained by hydrolysis needs to go through multiple washing processes, the main purpose of which is to remove harmful impurities represented by Fe ions, and finally make the product pure and have good pigment properties. Because Fe 2+ ions compared to Fe 3+ Ions are more convenient for washing, therefore, the pulp needs to go through the bleaching process before the second washing, and the use of Ti 3+ Fe in the slurry 3+ reduced to Fe 2+ , the present invention is to provide the preparation method of the trivalent titanium solution used in the bleaching process. [0003] The preparation of trivalent titanium solution in general factories is to directly produce trivalent titanium solution by u...

AI Technical Summary

Problems solved by technology

[0003] The preparation of trivalent titanium solution in general factories is to directly produce trivalent titanium solution by using the qualified slurry after washing. The disadvantage of this process is that the raw material for preparing trivalent titanium is to use the qualified slurry after washing. Valence titanium is lost after bleaching and washing, resulting in the loss of final titanium dioxide and increasing production costs

If the alkali-soluble washing liquid is not recycled and directly discharged, it will not only cause the loss of titanium and alkali and increase the production cost, but also increase the difficulty of sewage treatment. If it is not handled properly, it will easily cause environmental pollution.

Some enterprises use alkaline washing solution for calcination tail gas spraying in order to use the alkali in the filtrate to neutralize the acidic tail gas of calcination, but the TiO in the filtrate 2 not yet recycled