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

A solution, vanadium-chromium technology, applied in the field of hydrometallurgy, can solve the problems of low vanadium-chromium separation efficiency, reduced extraction saturation capacity, complicated steps, etc., and achieves the effects of remarkable separation effect, high extraction rate and low cost

Active Publication Date: 2021-02-26
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

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 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 13.19; said method comprising the steps of:

[0062] (1) After mixing trioctylmethylammonium chloride and tributyl phosphate, dilute with n-octanol to obtain a mixed organic solution, and the concentration of trioctylmethylammonium chloride in the mixed organic solution is 0.2mol / L , the volume fraction of tributyl phosphate is 50%;

[0063] (2) The mixed organic solution obtained in step (1) is mixed with the alkaline vanadium-chromium-containing solution at a volume ratio of 1:1, and then eight-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 the upper an...

Embodiment 2

[0068] 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 13.95; Described method comprises the following steps:

[0069](1) Dilute with toluene after mixing trioctylmethyl ammonium chloride and diphenyl sulfone to obtain a mixed organic solution, the concentration of trioctyl methyl ammonium chloride and diphenyl sulfone in the mixed organic solution is 0.05 mol / L;

[0070] (2) The mixed organic solution obtained in step (1) is mixed with the basic vanadium-chromium-containing solution in a volume ratio of 8:1 and then subjected to a first-level countercurrent extraction. The extraction time is 30 minutes, and the layers are left to stand to obtain the upper and lower parts. A system in which two layers of liquid coexist, th...

Embodiment 3

[0075] 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 13.61; Described method comprises the following steps:

[0076] (1) After dicyclohexylamine, trioctylamine and tributylphosphine oxide are mixed and diluted with n-octane, a mixed organic solution is obtained, and the total concentration of dicyclohexylamine and trioctylamine in the mixed organic solution is 0.5 mol / L, the concentration of tributylphosphine oxide is 0.6mol / L;

[0077] (2) The mixed organic solution obtained in step (1) is mixed with the basic vanadium-chromium-containing solution in a volume ratio of 1:5, and then four-stage countercurrent extraction is carried out. The single-stage extraction time is 50min, and the stratification is obtained by standing....

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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 amine extractant and a modifier with an alkaline vanadium-chromium-containing solution for extraction , to obtain a system in which the upper and lower 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 a stripping agent solution for stripping treatment, and the lower chromium-containing aqueous phase and the upper layer are obtained. The organic phase, 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 a strong alkaline solution containing vanadium and chromium, and the separation effect of vanadium and chromium is remarkable, the extraction rate of chromium is close to 100%, and the stripping rate of chromium can reach 100%. The method has the advantages of 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, in particular to a method for extracting and separating chromium from a strongly 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 li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/32C22B3/28C22B34/22
CPCC22B34/22C22B34/32C22B3/28C22B3/288Y02P10/20
Inventor 王少娜冯曼杜浩刘彪王欣然
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI