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Method for preparing scandium hydroxide through scandium-containing waste titanium acid liquor

A technology of scandium hydroxide and waste acid solution, applied in the field of extraction, can solve the problems of complicated operation steps for removing titanium by water, long process flow, etc., and achieve the effects of easy control of separation conditions, shortened process flow and stable properties.

Active Publication Date: 2017-08-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method saves the step of washing titanium with sulfuric acid hydrogen peroxide, the process flow is long and the operation steps of hydrolyzing and removing titanium are cumbersome.

Method used

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  • Method for preparing scandium hydroxide through scandium-containing waste titanium acid liquor
  • Method for preparing scandium hydroxide through scandium-containing waste titanium acid liquor

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preparation example Construction

[0065] For further illustrating the method for preparing scandium hydroxide of the present invention, a kind of method for preparing scandium hydroxide by scandium-containing titanium waste acid solution, it comprises the following steps:

[0066] Step S1, removing suspended solids and large particles of impurities from the waste acid solution containing scandium and titanium to obtain clarified acid solution;

[0067] Step S2, extracting the clarified acid solution to obtain a scandium-titanium organic phase enriched in scandium and titanium, wherein the extraction agent used in the extraction is bis(2-ethylhexyl) phosphate dissolved in solvent oil. A mixture or a mixture of di(2-ethylhexyl) phosphate and tributyl phosphate dissolved in solvent oil, the volume fraction of the di(2-ethylhexyl) phosphate in the mixture is 5%-25% %, and / or, the volume fraction of the tributyl phosphate in the mixture is 2%-5%, and the ratio of the extracted organic phase to the aqueous phase is ...

Embodiment 1

[0075] A kind of method of preparing scandium hydroxide by scandium-containing titanium waste acid solution of the present embodiment, its specific operation steps are as follows:

[0076] (1) Filtrating the waste acid solution containing scandium and titanium to obtain clarified acid solution. Among them, the components of scandium-containing titanium waste acid solution are shown in Table 1.

[0077] (2) Adding an extractant to the clarified acid solution, wherein the extractant is a mixture containing 10% of di(2-ethylhexyl) phosphate and 90% of kerosene. Take a separatory funnel for three-stage cascaded countercurrent extraction, the volume ratio of the organic phase to the aqueous phase is 1:21, and the single-stage extraction time is 15 minutes to obtain a scandium-titanium organic phase containing 270 mg / L scandium and 5.6 g / L titanium .

[0078](3) Add an eluent to the scandium-titanium organic phase containing scandium 270mg / L and titanium 5.6g / L, wherein the eluent...

Embodiment 2

[0082] (1) Filtrating the waste acid solution containing scandium and titanium to obtain clarified acid solution. Among them, the components of scandium-containing titanium waste acid solution are shown in Table 1.

[0083] (2) Adding an extractant to the clarified acid solution, wherein the extractant is a mixture containing 10% di(2-ethylhexyl) phosphate, 5% tributyl phosphate and 85% kerosene. A separatory funnel was used for three-stage cascaded countercurrent extraction, the ratio of the organic phase to the aqueous phase in the extraction system was 1:21, and the extraction time was 15 minutes to obtain a scandium-titanium organic compound containing 430 mg / L scandium and 6.05 g / L titanium. Mutually.

[0084] (3) Add an eluent to the scandium-titanium organic phase containing scandium 430mg / L and titanium 6.05g / L, wherein the eluent is Na 3 PO 4 and H 2 o 2 mixed solution of Na 3 PO 4 and H 2 o 2 The molar ratio with Ti is n Na3PO4 / n Ti = 1.5 / 1, n H2O2 / n ...

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Abstract

The invention provides a method for preparing scandium hydroxide through scandium-containing waste titanium acid liquor and relates to extraction technologies. The method specifically comprises the following steps that clear liquor is obtained after suspended solids and large-grained impurities of the scandium-containing waste titanium acid liquor are removed; the clear liquor is extracted, and scandium-titanium organic phases enriched in scandium and titanium are obtained; the scandium-titanium organic phases are eluted through an eluent, organic phases with titanium being removed are obtained, and an aqueous solution composed of hydrogen peroxide and substances containing phosphate radicals is used as the eluent; and the organic phases are subjected to reverse extraction treatment, and scandium hydroxide is obtained through separation and recovery. Compared with the method that in the prior art, titanium is removed through reextraction and a mixed solution which is composed of sulfuric acid and hydrogen peroxide and used as an eluent, the hydrogen peroxide aqueous containing phosphate radicals is used as the eluent for directly eluting titanium, the technological process is greatly shortened and simplified, the scandium titanium separation efficiency is high, and the cost is low.

Description

technical field [0001] The invention relates to extraction technology, more specifically, to a method for preparing scandium hydroxide from scandium-containing titanium waste acid solution. Background technique [0002] Scandium is a rare earth rare element, which has the advantages of good high temperature resistance (1500°C), high temperature and strong radiation resistance, high temperature insulation, etc. It is widely used in scandium sodium lamps, solar photovoltaic cells, alloy materials, organic additives, etc. . [0003] The independent minerals of scandium are extremely rare, so in the industry, the scattered scandium is associated with the comprehensive treatment of non-ferrous and rare metal ores. At present, scandium is mainly recovered and enriched by solvent extraction. In the production of titanium dioxide by the sulfuric acid method, about every ton of titanium dioxide produced, 20% of concentrated waste acid will be discharged in the hydrolysis process, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B7/00
CPCC22B7/006C22B59/00Y02P10/20
Inventor 李青刚李玉华张贵清曹作英曾理关文娟
Owner CENT SOUTH UNIV
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