Method for producing titanium dioxide by extracting titanium dioxide from titanium-containing blast furnace slag

Abstract

The invention discloses a method for extracting titanium dioxide from titanium-containing blast furnace slag to produce titanium dioxide, comprising the following steps: A. drying the blast furnace slag and grinding it into powder; B. adding ascorbic acid and sulfuric acid to the blast furnace slag powder and stirring evenly C. solid-liquid separation, and wash the filter cake with ascorbic acid to obtain ascorbic acid complex solution; D. utilize cation exchange resin to absorb titanium ions in the ascorbic acid complex solution; E. elution the cation resin with dilute sulfuric acid, And the eluent is hydrolyzed to obtain titanium dioxide. The present invention aims at the deficiencies of the existing technology for extracting titanium from high-titanium blast furnace slag, combines the idea of ​​leaching gold with sodium cyanide, adopts ascorbic acid complexation to leach blast furnace slag, selectively complexes and leaches titanium in blast furnace slag into the liquid phase, and then Liquid-solid separation, liquid-phase hydrolysis to produce titanium dioxide, and subsequent solid-phase recycling to realize high-value recycling of titanium in blast furnace slag, reduce the environmental burden of blast furnace slag, and promote the unification of economic and social benefits.

Description

technical field [0001] The invention relates to a method for extracting titanium dioxide from titanium-containing blast furnace slag to prepare titanium dioxide. Background technique [0002] Vanadium-titanium magnetite is an important mineral resource in my country. Vanadium-titanium is listed as an important national strategic resource, and its economic value is increasing year by year. The associated components in vanadium-titanium magnetite are difficult to completely separate and enrich in the process of beneficiation and smelting. The total recovery rate of vanadium and titanium is only 30-40%, and most of them are lost in tailings and smelting slag. Iron concentrate generally contains about 10% titanium dioxide, and most of them enter blast furnace slag after blast furnace ironmaking. The content of titanium dioxide in blast furnace slag Generally 21-25%, also known as high-titanium blast furnace slag. So far, the blast furnace slag discharged by Panzhihua Iron and Ste...

AI Technical Summary

Problems solved by technology

Method (1) can enrich titanium-containing minerals to a certain extent, but there are problems such as complicated beneficiation process, solid waste generated by the introduction of beneficiation agents, low quality of beneficiation products and their reuse; method (2) the composition of titanium alloy is unstable, physical and mechanical The performance is not up to standard, and the market application is limited; methods (3) and (4) have a long process flow, produce a large amount of waste liquid and waste residue, and have poor environmental benefits; method (5) uses high-value resources and low-value resources, and the waste of resources is serious. Low product added value, low economic and social benefits

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