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A method for extracting and separating chromium from alkaline vanadium-chromium-containing solution

A vanadium-chromium and solution technology, applied in the field of hydrometallurgy, can solve the problems of high vanadium concentration, reduced extraction saturation capacity, complicated steps, etc., and achieves the effects of short technological process, high-efficiency extraction, and convenient operation.

Active Publication Date: 2021-09-17
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pH value of the obtained solution after dissolving the vanadate is mostly between 11 and 14, and the concentration of vanadium in the solution is high and the concentration of chromium is low. With the existing method, it is necessary to first add acid to adjust the pH value of the solution, the steps are complicated, and the separation efficiency of vanadium and chromium Low, difficult to achieve efficient separation of chromium
CN 104694749 A discloses a method for extracting and separating vanadium and chromium from an alkaline aqueous solution. The extraction and separation of vanadium and chromium in an alkaline aqueous solution can be realized by using an amine extractant, but the pre-acidification step of the extractant, adding additional The addition of impurity reagents will lengthen the operation process and increase the cost, and the impurities will not only reduce the extraction saturation capacity of the extractant for vanadium, but also precipitate together with vanadium in the subsequent vanadium precipitation operation, affecting the product purity
In addition, seeking new extractants that can realize the separation of vanadium and chromium is also one of the important ways to improve the separation effect. CN 107312942 A discloses a method for extracting and separating vanadium and chromium from vanadium-chromium slag acid leaching solution. Use the ionic liquid whose cation is an alkyl-substituted imidazole as the extraction agent to extract the vanadium and chromium, and then carry out back extraction to obtain the chromium-containing back raffinate and the precipitation of vanadium, but the method is still an acidic solution, and the extraction agent Co-extracting vanadium and chromium requires separation again, with many steps and incomplete separation

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] This embodiment provides a method for extracting and separating chromium from an alkaline vanadium-chromium-containing solution. The concentration of chromium in the alkaline vanadium-chromium-containing solution is 300 mg / L, the concentration of vanadium is 9 g / L, and the initial pH value is 13.26; said method comprising the steps of:

[0061] (1) Dilute with n-hexane after mixing trihexyl tetradecyl phosphorus chloride and tributyl phosphate to obtain a mixed organic solution, the concentration of trihexyl tetradecyl phosphorus chloride in the mixed organic solution is 0.2mol / L, the volume fraction of tributyl phosphate is 50%;

[0062] (2) The mixed organic solution obtained in step (1) is mixed with the alkaline vanadium-chromium-containing solution at a volume ratio of 1:10, and then four-stage countercurrent extraction is carried out. The single-stage extraction time is 40min, and the separation is separated after centrifugation. , to obtain a system in which th...

Embodiment 2

[0067] This embodiment provides a method for extracting and separating chromium from an alkaline vanadium-chromium-containing solution, wherein the concentration of chromium in the alkaline vanadium-chromium-containing solution is 10 mg / L, the concentration of vanadium is 0.3 g / L, and the initial pH value is Be 11.86; Described method comprises the following steps:

[0068] (1) Dilute with toluene after mixing trihexyltetradecylphosphorus chloride and diphenyl sulfone to obtain a mixed organic solution, the concentration of trihexyltetradecylphosphorus chloride and diphenylsulfone in the mixed organic solution 0.05mol / L;

[0069](2) The mixed organic solution obtained in step (1) is mixed with the alkaline vanadium-chromium-containing solution at a volume ratio of 1:50, and then three-stage countercurrent extraction is carried out, the single-stage extraction time is 20min, and the stratification is obtained by standing. A system in which the upper and lower layers of liquid ...

Embodiment 3

[0074] This embodiment provides a method for extracting and separating chromium from an alkaline vanadium-chromium-containing solution, wherein the concentration of chromium in the alkaline vanadium-chromium-containing solution is 150 mg / L, the concentration of vanadium is 4.5 g / L, and the initial pH value Be 10.61; Described method comprises the following steps:

[0075] (1) Dilute with n-octanol after mixing trihexyltetradecylphosphine chloride and tributylphosphine oxide to obtain a mixed organic solution, and the concentration of trihexyltetradecylphosphine chloride in the mixed organic solution is: 0.3mol / L, the concentration of tributylphosphine oxide is 0.4mol / L;

[0076] (2) The mixed organic solution obtained in step (1) is mixed with the alkaline vanadium-chromium-containing solution at a volume ratio of 1:20, and then five-stage countercurrent extraction is carried out, and the single-stage extraction time is 10min, and the stratification is obtained by standing A ...

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Abstract

The invention provides a method for extracting and separating chromium from an alkaline vanadium-chromium-containing solution, the method comprising the following steps: mixing an organic solution containing an ionic liquid extractant with an alkaline vanadium-chromium-containing solution for extraction to obtain upper and lower A system in which two layers of liquid coexist, the upper layer is a chromium-containing organic phase, and the lower layer is a vanadium-containing aqueous phase; the obtained chromium-containing organic phase is mixed with the stripping agent solution for stripping treatment, and the lower chromium-containing aqueous phase and the upper organic phase are obtained. The upper organic phase is returned for recycling. The method of the invention can realize high-efficiency extraction of chromium and zero extraction of vanadium in strong alkaline vanadium-chromium-containing solution. It can reach 100%; the method has short technological process, convenient operation, recyclable extractant and low cost.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and relates to a method for extracting and separating chromium from an alkaline solution containing vanadium and chromium. Background technique [0002] Vanadium and chromium are located adjacent to each other in the periodic table of elements and have similar properties. They often exist in vanadium-titanium magnetite in the form of co-occurrence in nature, and because the content of vanadium in vanadium-titanium magnetite is generally low, it often needs to undergo Concentrate smelting - hot metal extraction of vanadium - vanadium slag extraction of vanadium oxide and other processes to achieve the extraction of vanadium in vanadium-titanium magnetite. At present, the techniques for extracting vanadium from vanadium slag are mainly fire roasting and wet liquid phase oxidation. The former includes sodium roasting, calcification roasting and blank roasting, etc. The latter usually uses st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/32C22B3/40
CPCC22B34/32C22B3/26Y02P10/20
Inventor 王少娜冯曼杜浩刘彪王欣然郑诗礼
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI