A method for removing iron, manganese, vanadium and chromium impurities from a fluorination method leachate of titanium-containing slag

Abstract

The invention discloses a method for removing iron, manganese, vanadium and chromium impurities from a titanium-containing furnace slag fluorination-method leaching solution and belongs to the technical field of titanium resource utilization. The method for removing the iron, manganese, vanadium and chromium impurities from the titanium-containing furnace slag fluorination-method leaching solutioncomprises the steps that liquid ammonia is used as an impurity remover, and the pH value of the titanium-containing furnace slag fluorination-method leaching solution is controlled; impurity removingreaction is performed within the set temperature range, and impurity ingredients M (iron, manganese, vanadium and chromium) in the leaching solution are made to be removed entirely to form (NH4)yMFxsediment; and solid-liquid separation is performed to obtain a titanium-containing furnace slag fluorination-method titanium solution with the qualified impurity content. The invention provides the method for removing the iron, manganese, vanadium and chromium impurities from the titanium-containing furnace slag fluorination-method leaching solution, removing of the impurities in the titanium-containing furnace slag fluorination-method leaching solution can be realized, the titanium-containing furnace slag fluorination-method titanium solution with the qualified content is prepared, raw materials are provided for subsequent titanium solution hydrolysis, and the method for removing the iron, manganese, vanadium and chromium impurities from the titanium-containing furnace slag fluorination-method leaching solution is reasonable in process procedure design, easy to operate and free of environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of utilization of titanium resources, and in particular relates to a method for removing impurities of iron, manganese, vanadium and chromium from leaching solution of titanium-containing slag fluoridation method. Background technique [0002] There are 9.66 billion tons of vanadium-titanium magnetite in the Panxi region of my country, accounting for 90.5% of the national titanium resource reserves. At present, the titanium in the vanadium-titanium magnetite concentrate obtained through the beneficiation process accounts for about 52% of Panxi's titanium resources. At this stage, the blast furnace method is mainly used for smelting, and only iron and vanadium can be used. , titanium exists in the blast furnace titanium slag in the form of perovskite, in which TiO 2 The grade is about 25%, which cannot be effectively utilized at present. The vanadium-titanium magnetite concentrate is processed by pre-reduct...

AI Technical Summary

Problems solved by technology

During the preparation of titanium dioxide by the fluorination method of titanium-containing slag, the impurity elements M (Fe, Mn, V, Cr) in it will react with the fluoride ions in the leaching agent to form MF x y- Ions, fluorinated complex ions MF x y- and NH in the leachate 4 + Ions combine to form a slightly soluble product (NH 4 ) y MF x Precipitation, but because of the NH in the leachate 4 + Insufficient ions to completely precipitate MF in x y- ions, so that the leaching solution still contains a small amount of impurities M (Fe, Mn, V, Cr), these impurity components MF x y- In the subsequent hydrolysis process, it will be hydrolyzed together with the titanium component to form precipitate inclusions in TiO 2 In the precursor, the content of impurity elements Fe, Mn, V, Cr in the prepared titanium dioxide is too high

[0004] In the prior art, there are following problems in the titanium dioxide prepared from titanium-containing slag fluorination leachate: 1), Fe 2 o 3 If the content exceeds 90ppm or 30ppm, the whiteness of titanium dioxide (anatase or rutile) will be extremely reduced, showing a light yellow; 2), the content of MnO in titanium dioxide products exceeds 30ppm, and the titanium dioxide products will appear gray; 3) , V in titanium dioxide 2 o 5 Content higher than 70ppm, titanium dioxide will show light gray blue; 4), Cr in titanium dioxide 2 o 3 If the content exceeds 1.5ppm, the titanium dioxide will appear light brown, which will seriously affect the whiteness and quality of titanium dioxide.

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