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

Abstract

The invention discloses a method for preparing titanium dioxide by extracting titanium dioxide from titanium-containing blast furnace slag. The method comprises the following steps: A, drying the blast furnace slag, and grinding into powder; B, adding ascorbic acid and sulfuric acid into the blast furnace slag powder, uniformly stirring, standing and soaking; C, carrying out solid-liquid separation, and washing filter cake with ascorbic acid to obtain an ascorbic acid complexing solution; D, adsorbing titanium ions in the ascorbic acid complexing solution by utilizing cation exchange resin; and E, eluting the cationic resin with dilute sulfuric acid, and hydrolyzing the eluate to obtain the titanium dioxide. Aiming at overcoming the defects of the existing process for extracting titanium from high-titanium blast furnace slag, and by combining a thought of sodium cyanide gold leaching, the blast furnace slag is complexed and leached through ascorbic acid, titanium in the blast furnace slag is selectively complexed and leached into a liquid phase, then titanium dioxide is prepared through liquid-solid separation and liquid-phase hydrolysis, solid phases are subsequently further recycled, high-valued recycling of titanium in the blast furnace slag is achieved, the environmental burden of the blast furnace slag is relieved, and unification of economic benefits and social benefits is promoted.

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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