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Method for extracting vanadium from alkaline leaching solution containing vanadium stone coal

A technology of alkaline leaching solution and vanadium stone, applied in the direction of improving process efficiency, etc., can solve the problems of large acid, salt and energy consumption, long process flow, etc., and achieve the goal of improving vanadium extraction efficiency, simplifying process flow, and reducing environmental pollution Effect

Inactive Publication Date: 2012-01-18
NANTONG HANRUI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This silicon removal method consumes a lot of acid, salt and energy
In order to increase the concentration of vanadium and remove impurity ions, the liquid after silicon removal generally has an ion exchange process, resulting in a long process flow.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Crush the ore to 30 meshes, then make ore balls with a diameter of 8mm, and roast them at 850°C for 2 hours. The roasted ore balls are leached with NaOH solution (1mol / L) 0.8 times its mass to obtain leached ore pulp;

[0033] 2. Solid-liquid separation of ore pulp to obtain leaching liquid and leaching slag;

[0034] 3. The leaching solution obtained in the second step is pressed by the V contained in the solution. 2 o 5 Add 20% mass concentration of copper-iron reagent to 10 times the mass, fully stir, and place for ten minutes; the copper-iron reagent is N-nitroso-N-phenylhydroxylamine ammonium salt, molecular formula: C 6 h 9 N 3 o 2 ;

[0035] 4. The solution obtained in the third step is subjected to conventional solid-liquid separation, and the obtained precipitate is a vanadium compound, and the vanadium precipitation rate is 95%.

Embodiment 2

[0037] 1. Crush the ore to 60 meshes, then make ore balls with a diameter of 12mm, roast at 900°C for 2-3 hours, and leaching the roasted ore balls with NaOH solution (1.5mol / L) twice its mass to obtain leached pulp;

[0038] 2. Solid-liquid separation of ore pulp to obtain leaching liquid and leaching slag;

[0039] 3. The leaching solution obtained in the second step is pressed by the V contained in the solution. 2 o 5 Add 18% copper-iron reagent to 15 times the mass concentration, fully stir, and place for ten minutes; the copper-iron reagent is N-nitroso-N-phenylhydroxylamine ammonium salt, molecular formula: C 6 h 9 N 3 o 2 ;

[0040] 4. The solution obtained in the third step is subjected to conventional solid-liquid separation, and the obtained precipitate is a vanadium compound, and the vanadium precipitation rate is 96%.

Embodiment 3

[0042] 1. Crush the ore to 50 meshes, then make ore blocks with a diameter of 10mm, roast at 950°C for 2-3 hours, and leaching the roasted ore balls with NaOH solution (0.8mol / L) twice its mass to obtain leached ore pulp;

[0043] 2. Solid-liquid separation of ore pulp to obtain leaching liquid and leaching slag;

[0044] 3. The leaching solution obtained in the second step is pressed by the V contained in the solution. 2 o 5 Add 15% copper-iron reagent to 20 times the mass concentration, fully stir, and place for six minutes; the copper-iron reagent is N-nitroso-N-phenylhydroxylamine ammonium salt, molecular formula: C 6 h 9 N 3 o 2 ;

[0045] 4. The solution obtained in the third step is subjected to conventional solid-liquid separation, and the obtained precipitate is a vanadium compound, and the vanadium precipitation rate is 96%.

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Abstract

The invention provides a method for extracting vanadium from alkaline leaching solution containing vanadium stone coal. The method comprises the following steps of: smashing ore containing the vanadium stone coal, roasting at the temperature of 800-950 DEG C, leaching with alkaline solution with 0.7-2 times weight of the ore and mol concentration of 0.7-1.8mol / L after roasting is carried out, so as to obtain ore pulp; carrying out solid-liquid separation on the ore pulp to obtain leachate and leached slag; excessively adding cupferron with the mass concentration of 15-25% into the leachate obtained in the previous step, fully stirring, standing, and then carrying out solid-liquid separation on the obtained solution, wherein the obtained precipitate is namely vanadium compound. The method provided by the invention solves the problem of separating vanadium and silicon in the traditional alkaline method stone coal vanadium extracting leachate, two processes, namely silicon removal and ion exchange, in the traditional alkaline method vanadium extracting leachate are reduced, the alkaline method stone coal vanadium extracting process is greatly simplified, and vanadium precipitation rate is more than 95%, thus the method provided by the invention has a great market promotion prospect.

Description

technical field [0001] The invention relates to a process for extracting vanadium from vanadium-containing stone coal, which is suitable for all occasions where vanadium is directly extracted from vanadium-containing ores by using a blank roasting leaching solution. Background technique [0002] Vanadium extraction from stone coal usually refers to the industrial process of extracting vanadium compounds from vanadium-containing carbonaceous shale, vanadium-containing coal gangue, vanadium-containing clay ore, etc. [0003] In the past, the vanadium extraction process from stone coal was mainly divided into two major process routes, namely the roasting and leaching vanadium extraction process and the direct acid leaching vanadium extraction process. Roasting and leaching vanadium extraction process refers to the process in which the ore is oxidized and roasted at high temperature, and the low-valent vanadium is oxidized into pentavalent vanadium, and then wet leached to obtai...

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B3/44C22B1/02C22B34/22
CPCY02P10/20
Inventor 喻华葛广凯
Owner NANTONG HANRUI IND
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