A kind of titanium-containing slag preparation tio 2 powder method

Abstract

The invention discloses a method for making TiO2 powder from titanium-containing slag and belongs to the technical field of titanium resource utilization. Specific to the factors that impurity elements in the titanium-containing slag are diversified and large in content, and impurity components are complex, the difference of the dissolving property of a titanium element fluorine and ammonium containing complex and an impurity element fluorine and ammonium containing complex is adopted, a fluorination leaching agent with the [NH4+]-[F-] system is used for selectively leaching the titanium-containing slag, the titanium element in the titanium-containing slag can be dissolved in the leaching agent, and all calcium, magnesium, aluminum and most of impurities such as iron, manganese, vanadium and chromium are left in leaching slag in the form of sediments. The fluorination leaching agent is subjected to impurity removing, the impurities such as iron, manganese, vanadium and chromium in theleaching agent are removed in the form of sediments, and the purpose of purifying the leaching agent is achieved. The purified leaching agent is subjected to hydrolyzing, the titanium component in theleaching agent can be hydrolyzed into the precursor sediment capable of preparing TiO2 powder, finally, the TiO2 precursor is subjected to defluorination and deamination through thermal hydrolysis, and the TiO2 precursor is transformed into the TiO2 powder through roasting.

Description

Technical field [0001] The invention belongs to the technical field of titanium resource utilization, relates to a method for comprehensively utilizing titanium-containing slag, and specifically relates to a titanium-containing slag preparing TiO 2 Powder method. Background technique [0002] my country's Panzhihua-Xichang area contains extremely rich vanadium-titanium magnetite resources, with proven reserves of about 9.66 billion tons (including ultra-low-grade ore), of which TiO 2 The resource amount reached 1.286 billion tons, accounting for 35.17% of the world's total titanium resources. In the current Panxi resource development process, about 52% of the titanium of the vanadium-titanium magnetite goes into the vanadium-titanium magnetite concentrate after the beneficiation process, and about 24% of the titanium goes into the ilmenite concentrate. The vanadium-titanium magnetite concentrate is smelted by the blast furnace method to obtain titanium-containing blast furnace sl...

AI Technical Summary

Problems solved by technology

[0009] In view of the fact that the acid leaching method in the prior art cannot effectively selectively leach titanium elements in titanium-containing slag, resulting in a large amount of impurity elements being dissolved in the titanium liquid, resulting in difficulty in removing impurities in the subsequent titanium liquid, the beneficiation method cannot effectively separate the titanium-containing slag impurity, sort out the difficult problem of titanium-containing products, the object of the present invention is to provide a kind of titanium-containing slag to prepare TiO 2 Powder method, using fluorine-containing leaching agent to selectively leach titanium element in titanium-containing slag, and the leachate is prepared by impurity removal and hydrolysis to prepare TiO 2 precursor, followed by thermal hydrolysis and calcination of TiO 2 Preparation of TiO from Precursors 2 Powder, the process design of the invention is reasonable, the operation is simple, the reagents can be recycled, and there is no environmental pollution

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