Recycling and Utilization of Sulfuric Acid Process Titanium Dioxide Acid Decomposition Slag

Abstract

The invention relates to a technology for producing titanium dioxide with a sulfuric acid method, in particular to a method for recycling acidolysis residues of titanium dioxide produced with the sulfuric acid method. The method comprises steps as follows: A, the titanium content of the acidolysis residues is increased through concentration, and concentrated acidolysis residues are obtained; B, the concentrated acidolysis residues are added to a wet ball mill and milled to be fine; C, the finely milled acidolysis residues are subjected to filter pressing and blow drying; D, sulfuric acid is added and mixed with filter press cakes, and a mixture is beaten and then is pumped into an acidolysis pot with an acidolysis titanium concentrate premix together for acidolysis. The method has the advantages as follows: 1), the acidolysis rate of the acidolysis residues is increased; 2), productivity reduction caused by a vicious circle due to a poor acidolysis effect of coarse-particle mineral powder in the concentrated acidolysis residues is avoided; 3), resources are sufficiently recovered, and the stacking quantity of the residues is reduced.

Description

technical field [0001] The invention relates to a production process of sulfuric acid titanium dioxide, in particular to a treatment method for acidolysis slag of sulfuric acid titanium dioxide. Background technique [0002] The main raw material of sulfuric acid titanium dioxide production process is titanium concentrate, its composition is iron titanate, and the active ingredient titanium dioxide generally ranges from 45% to 55%. After the purchased titanium concentrate is pulverized by Raymond mill or ball mill, it is mixed with concentrated sulfuric acid according to the calculated amount in the acid hydrolysis pot, and then diluted with water, and the dilution heat of concentrated sulfuric acid is used to initiate the acid hydrolysis reaction to form a loose and porous solid phase substance. After slaking, adding water leaching, adding iron powder for reduction, etc., it becomes an acidolysis titanium solution. The main components of the titanium solution are the aqueou...

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Problems solved by technology

In addition, we also found that because the usually obtained acid hydrolyzed slag has relatively high viscosity, as the acidolysis reaction proceeds, the generated acidolysis products will gradually wrap the unacidolyzed acidolyzed slag, resulting in intermediate Unreacted materials are difficult to acid hydrolyze, so the acid hydrolysis rate is affected

[0006] The recycling method of a kind of sulfuric acid process titanium dioxide acid hydrolysis slag mentioned in the present invention has not yet seen relevant public reports in China