Method for recycling titanium from sulfuric acid method titanium white acidolysis residue

Abstract

The invention discloses a method for recycling titanium from sulfuric acid method titanium white acidolysis residue. The method comprises the following steps of: (1) washing the acidolysis residue produced when titanium white powder is produced by using a sulfuric acid method, and removing fine silt from the residue by using a cyclone; (2) preparing residue pulp of which the concentration is 20 to 30 percent, and regulating the pH of the residue pulp by using oxalic acid, wherein the final pH value is 6 to 7; and (3) adding No.2 oil serving as a foaming agent and ROB serving as a collecting agent, controlling the temperature to be between 20 and 40 DEG C, performing two-stage flotation to obtain titanium ore, drying, and thus obtaining a raw material for producing the titanium white powder, wherein the grade of the recovered titanium ore is more than 46 percent, and the recovery rate is more than 85 percent. The method has the advantages of recovering the valuable component in the residue, eliminating potential harm of the stored original acidolysis residue to the environment, protecting the environment and bringing huge social benefits.

Description

technical field [0001] The invention relates to the technical field of recycling titanium from the acidolysis residue of producing titanium dioxide by a sulfuric acid method. Background technique [0002] There are two kinds of titanium dioxide production: sulfuric acid method and chlorination method. my country's titanium dioxide production mainly adopts sulfuric acid method. For every ton of titanium dioxide produced, in addition to producing 8-10 tons of dilute sulfuric acid and 3-3.5 tons of ferrous sulfate heptahydrate , but also to discharge 0.2 to 0.3 tons of insoluble black waste residue. Analysis shows that the content of titanium dioxide in these waste residues is about 25%, which has recycling value. Since these waste residues are the products of the sulfuric acid soaking process, the surface characteristics have changed greatly. So far, the comprehensive utilization and resource treatment of black waste residues have not been well resolved, and they are basically...

AI Technical Summary

Problems solved by technology

Because these waste residues are the products of sulfuric acid soaking process, the surface characteristics have changed greatly. So far, the comprehensive utilization and recycling of black waste residues have not been well resolved, and they are basically treated as waste. Disposal, which not only wastes the valuable resources and reduces the profit of the enterprise, but also the discharge of acid waste piles will cause harm to the local environment