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A method for separating and recovering vanadium and chromium from a solution containing vanadium or/and chromium

A separation and recovery, solution technology, applied in chemical instruments and methods, process efficiency improvement, inorganic chemistry and other directions, can solve the problems of high cost, complex process, complicated operation, etc., to achieve low production cost, good separation effect, process short process effect

Inactive Publication Date: 2018-03-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Quaternary amine or primary-secondary compound amine extraction method can realize the separation of vanadium and chromium in the solution, but the cost of extraction and separation of vanadium and chromium is high, and the process conditions are difficult to control
Chinese patent CN101538652B uses macroporous strong basic resin D201 to separate vanadium and chromium in the green mud leach solution, but the separation of vanadium and chromium is not complete
The whole process requires both oxidative vanadium-containing chromate solution and reductive vanadium-containing chromate solution. The process is long and the operation is complicated, and only qualified products of vanadium can be recovered, and chromium is still obtained in the form of chromium slag. Form recovery, the efficiency of separation and recovery of vanadium and chromium is low
Chinese patent ZL 201210160816.1 uses weak base and strong base anion exchange resins for the difference in anion exchange potential formed by hexavalent chromium and pentavalent vanadium in aqueous solution, realizes the separation of vanadium and chromium through saturated adsorption, and directly obtains the products of vanadium and chromium, But the process is complicated, and the aqueous solution containing hexavalent chromium and pentavalent vanadium will cause great damage to the resin, seriously affecting the service life of the resin
In addition, these methods have a common defect, that is, the alkali in the solution cannot be separated and recovered.
Although in the process of chromite ore treatment, some manufacturers adopt certain measures to recover alkali, but only a small part of it is recovered, and most of the alkali eventually becomes sulfate with low economic value.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take 1.5m of the vanadium slag extracting solution containing V 25.6g / L and Cr 2.3g / L with a pH of 9.6 3 , add calcium hydroxide according to 1.3 times of the stoichiometric number of vanadium forming calcium vanadate, stir and ball mill at room temperature for 1.5h, filter to obtain the vanadium-precipitated liquid containing V0.06g / L and the vanadium-enriched slag containing Cr﹤0.1% . The obtained vanadium-precipitated liquid is returned to the vanadium slag extracting vanadium leaching process to continue to use; the obtained vanadium-enriched slag is added with water at a solid-to-liquid ratio of 1:3g / ml, stirred and added with 2mol / L H 2 SO 4 , react at 70°C for 1.5h, control the end point pH value to 3.2, and filter to obtain a vanadium-enriched solution, add ammonium to precipitate vanadium at a mass ratio of ammonium sulfate / vanadium pentoxide to the obtained vanadium-enriched solution, and add sulfuric acid to adjust the pH to 2.0, stirred at 95°C for 1.5h, f...

Embodiment 2

[0044] Take the obtained solution 1.5m of the vanadium slag calcined sand obtained by liquid leaching after the vanadium precipitation obtained in Example 1 3 , adding calcium oxide according to 1.5 times of the stoichiometric number of vanadium forming calcium vanadate, ball milling at 60°C for 1h, and filtering to obtain the vanadium-precipitated liquid containing V 0.02g / L and the vanadium-enriched slag containing Cr﹤0.1%. Add barium carbonate to the vanadium-precipitated solution according to 1.2 times the stoichiometric number of barium chromate formed by the chromium therein, stir and grind at room temperature for 0.5h, filter to obtain the chromium-precipitated solution and chromium-enriched slag containing Cr 0.03g / L, and the obtained precipitated solution The chromium solution is first evaporated and concentrated to 0.5m 3 , and then stirred at room temperature and introduced CO 2 Adjust the pH to 9.2, crystallize and precipitate sodium bicarbonate at 0°C, and return...

Embodiment 3

[0046] Take 1500ml of leaching solution obtained from vanadium-chromium reduction slag containing V 15.6g / L and Cr 28.1g / L with a pH of 10.8, sodium roasting-water leaching, and add calcium oxide according to 1.2 times the stoichiometric number of vanadium forming calcium vanadate , ground at room temperature for 1 h, and filtered to obtain a vanadium-precipitated liquid containing V 0.02 g / L and a vanadium-enriched slag containing Cr﹤0.1%. The obtained vanadium-enriched slag is used to produce vanadium chemical products. The obtained vanadium-precipitated liquid is then added with barium hydroxide according to 1.1 times the stoichiometric number of barium chromate formed by the chromium therein, stirred at room temperature for 0.5h, and filtered to obtain chromium-enriched slag and chrome solution. The obtained chromium-enriched residue is used to produce chromium chemical products; the obtained chromium-precipitated liquid is stirred at room temperature and introduced into C...

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PUM

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Abstract

The invention relates to a method for separating vanadium and chromium from vanadium or / and chromium-contained solution. The method is characterized by comprising the following steps: firstly, a precipitating agent A is added in the vanadium or / and chromium-contained solution to selectively precipitate and separate out vanadium therein; then, a precipitating agent B is added to precipitate and separate out chromium therein; CO2 is introduced in chromium precipitating post-liquid to crystallize and separate out sodium bicarbonate; and finally, vanadium and chromium are respectively separated from vanadium enriched slag and chromium enriched slag. The method has such advantages as short process flow, simple operation, low production cost, good separation effect of vanadium and chromium and environmental friendliness, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for separating and recovering vanadium and chromium from a solution containing vanadium or / and chromium. Background technique [0002] Vanadium and chromium are similar in nature, and they usually coexist in minerals. Therefore, the separation of vanadium and chromium is a problem that must be solved in the process of vanadium-chromium metallurgy and chemical industry. The aqueous solution of vanadium and chromium has similar properties, and it is a worldwide problem to separate vanadium and chromium in the solution. So far, many methods have been developed to separate and recover vanadium and chromium from vanadium-chromium-containing solutions, but they are not satisfactory in use, including solvent extraction, ion exchange and ammonium salt precipitation. Quaternary amine or primary-secondary compound amine extraction method can realize the separation of vanadium and chromium in the solution, but the cost of extra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B34/22C22B34/32C01D7/00
CPCC01D7/00C22B3/44C22B34/22C22B34/32Y02P10/20
Inventor 王学文孟钰麒王明玉陈边防
Owner CENT SOUTH UNIV