Aluminum removal method for shale vanadium extraction pickle liquor

A vanadic acid and shale technology, applied in the field of aluminum removal for shale extraction of vanadic acid leaching solution, can solve the problems of long reaction time and long process flow, and achieve the effects of short reaction time, short process flow and shortened process flow

Inactive Publication Date: 2020-06-19
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process has the advantage of low vanadium loss rate, it has the disadvantages of long reaction time and long process flow, and the vanadium-containing solution described in this process contains a large amount of oxalate, which is not suitable for general vanadium-containing acid leaching solution.
[0006] In summary, the existing methods for separating vanadium and aluminum from vanadium-containing solutions mainly have problems such as long process flow and long reaction time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for removing aluminum from vanadic acid leaching solution for extracting shale. The concrete steps of the method described in this embodiment are:

[0024] Step 1. Add potassium salt to the vanadic acid leaching solution for extracting shale, and mix to obtain a pretreatment solution. The molar ratio of Al:K in the pretreatment solution is 1: (0.8-1.5).

[0025] Step 2, placing the pretreatment solution in a closed container, and stirring for 4.5-6 hours at a temperature of 140-180° C. and a rotation speed of 100-200 r / min to obtain a mixed slurry.

[0026] Step 3: Separating the mixed slurry from solid to liquid to obtain aluminium-removing purification solution and alum slag.

[0027] The vanadic acid leaching solution for extracting shale: the aluminum concentration is 4-15 g / L; the pH value is -0.50-1.0.

[0028] In this embodiment: the removal rate of Al is 80-86%; the loss rate of vanadium is 1.2-2%.

Embodiment 2

[0030] A method for removing aluminum from vanadic acid leaching solution for extracting shale. The concrete steps of the method described in this embodiment are:

[0031] Step 1. Add potassium salt to the vanadic acid leaching solution for extracting shale, and mix to obtain a pretreatment solution. The molar ratio of Al:K in the pretreatment solution is 1: (1.5-2.2).

[0032] Step 2, placing the pretreatment solution in a closed container, and stirring for 4-5 hours under the conditions of a temperature of 160-220° C. and a rotation speed of 200-300 r / min, to obtain a mixed slurry.

[0033] Step 3: Separating the mixed slurry from solid to liquid to obtain aluminium-removing purification solution and alum slag.

[0034] The vanadic acid leaching solution for extracting shale: the aluminum concentration is 10-20 g / L; the pH value is 0.5-1.5.

[0035] In this embodiment: the removal rate of Al is 83-88%; the loss rate of vanadium is 0.8-1.5%.

Embodiment 3

[0037] A method for removing aluminum from vanadic acid leaching solution for extracting shale. The concrete steps of the method described in this embodiment are:

[0038] Step 1: Add potassium salt to the vanadic acid leaching solution for shale extraction, and mix to obtain a pretreatment solution, wherein the molar ratio of Al:K in the pretreatment solution is 1: (2.2-3.0).

[0039] Step 2, placing the pretreatment liquid in a closed container, stirring for 3.5-4.5 hours at a temperature of 200-280° C. and a rotation speed of 300-400 r / min to obtain a mixed slurry.

[0040] Step 3: Separating the mixed slurry from solid to liquid to obtain aluminium-removing purification solution and alum slag.

[0041] The vanadic acid leaching solution for extracting shale: the aluminum concentration is 15-25 g / L; the pH value is 1.0-2.0.

[0042] In this embodiment: the removal rate of Al is 85-90%; the loss rate of vanadium is 0-1.2%.

[0043] This embodiment has the following positi...

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PUM

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Abstract

The invention relates to an aluminum removal method for shale vanadium extraction pickle liquor. According to the technical scheme, the aluminum removal method comprises the steps that potassium saltis added into the shale vanadium extraction pickle liquor and mixed, and pretreatment liquid is obtained, wherein the mole ratio of Al to K in the pretreatment liquid is 1:(0.8 to 3.0); the pretreatment liquid is placed in an airtight container and stirred under the conditions of 140-280 DEG C and 100-400 r/min for 3.5-6 h, and mixed slurry is obtained; and the mixed slurry is subjected to solid-liquid separation, and aluminum removal purification liquid and alunite slag are obtained. As for the shale vanadium extraction pickle liquor, the aluminum concentration is 4-25 g/L, and the pH is -0.50-2.0. The potassium salt is one or more of potassium sulfate, potassium chloride and potassium bisulfate. The aluminum removal method has the characteristics of easy and convenient operation, environmental friendliness and short technological process, and V and Al can be effectively separated.

Description

technical field [0001] The invention belongs to the technical field of acid leaching solution for extracting vanadium from shale. In particular, it relates to a method for removing aluminum from shale extracting vanadic acid leaching solution. Background technique [0002] Vanadium mostly exists in mica minerals in the form of isomorphism in vanadium-bearing shale. During vanadium shale leaching and extraction of vanadium, with the destruction of mica structure, a large amount of impurity aluminum enters the liquid phase, which increases the content of impurity aluminum in the vanadium-containing leaching solution, which affects the subsequent purification and enrichment effect of vanadium and the quality of the final vanadium product. Therefore, it is necessary to reduce the concentration of aluminum in the acid leaching solution for vanadium extraction from shale to reduce the adverse effect on the subsequent process. [0003] "A method for simultaneously extracting vana...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B34/22
CPCC22B3/44C22B34/22Y02P10/20
Inventor 张一敏王露瑶薛楠楠胡鹏程
Owner WUHAN UNIV OF SCI & TECH
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