Hydrolysis reaction method for extracting titanium dioxide

Abstract

The invention discloses a hydrolysis reaction method for extracting titanium dioxide. The hydrolysis reaction method is characterized by comprising the following steps: (1) a hydrolysis reaction, including: adding an acidolysis solution generated from an acidolysis reaction which is used for extracting titanium dioxide in a hydrolysis reaction pot, adding a NaOH solution in the hydrolysis reaction pot, performing stirring and heating, and carrying out a reaction for 2.5-3 h; (2) filtration of a hydrolyzing solution, including filtering the hydrolyzing solution and separating a filtrated hydrolyzing liquid and a solid product; and (3) waste acid solution recovery and titanium dioxide product preparation, including adding the filtrated hydrolyzing liquid in an evaporating pot for concentration and recovering distilled water, then filtering the hydrolyzing liquid and obtaining a waste acid solution by-product and a sulfate filter residue by-product; and washing the solid product, and performing drying and calcination to obtain the titanium dioxide product. The method is simple in steps and convenient to operate. Waste acid can be recovered and utilized, the recovery process is simple, and the recovery cost is low, so that the production cost is reduced. The method is suitable for popularization and operation.

Description

technical field [0001] The invention relates to a method for extracting titanium dioxide, in particular to a hydrolysis reaction method for extracting titanium dioxide. Background technique [0002] The currently widely used sulfuric acid method to produce titanium white is to use concentrated sulfuric acid to react with ground titanium concentrate (TiO2 content below 46%) to extract titanium liquid, and then remove impurity ions (such as Fe) through evaporation, concentration and crystallization of titanium liquid. ), and then hydrolyzed to produce titanium dioxide. The above-mentioned method for extracting titanium dioxide has the following problems: [0003] (1) The raw material is titanium concentrate that has been processed after mining, but there are still many iron and other interfering elements. During the production process, it needs to be processed by multiple equipment and steps, and the equipment cost and energy cost are consumed in this link. larger. [0004]...

AI Technical Summary

Problems solved by technology

[0003] (1) The raw material is titanium concentrate that has been processed after mining, but there are still many iron and other interfering elements. During the production process, it needs to be processed by multiple equipment and steps, and the equipment cost and energy cost are consumed in this link. bigger

[0004] (2) Concentrated sulfuric acid with a concentration of more than 90% must be used during production, and waste sulfuric acid is difficult to utilize, and its utilization cost is high

[0005] (3) Titanium concentrate needs to be ground into powder before reaction, and the dust pollution is serious