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Method for comprehensively recycling copper, selenium and uranium from stone coal extraction vanadic acid immersion liquid

A recovery method and technology of stone coal are applied in the field of comprehensive recovery of uranium, extraction of selenium and vanadium from stone coal and copper in acid leaching solution, which can solve the problems of large environmental protection pressure and failure to find suitable solutions for vanadium extraction from stone coal, so as to avoid radioactive waste water and waste residue. , reduce pollution, facilitate the effect of liquid-solid separation

Inactive Publication Date: 2012-10-24
CENT SOUTH UNIV +1
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

The iron, aluminum, and potassium in the stone coal acid leaching solution have been comprehensively utilized, but the copper, selenium, and uranium in it have not yet found a suitable method to recover, which brings great environmental pressure to the extraction of vanadium from stone coal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take V 2 o 5 4.86g / L, Cu 0.09g / L, U 5mg / L, P 1.1g / L stone coal acid leaching solution 6000ml, add 150g potassium sulfate and 50g potassium chloride to crystallize the aluminum in the solution in the form of potassium alum , filter to obtain potassium alum and the liquid after removing aluminum; add copper sulfate earlier to the liquid after removing aluminum, so that the concentration of copper in the solution rises to 0.6g / L Cu, then add phosphoric acid to make the uranium / phosphorus mol ratio in the solution increase to 1: 600, then add potassium carbonate to adjust the pH to 0.2, and finally add reduced iron powder according to 1.5 times the stoichiometric number of Fe(II) and V(IV) in the liquid after aluminum removal, reduce at room temperature for 2 hours, and age for 1 hour , filtered to obtain the reduced liquid containing Cu 5mg / L, U﹤1mg / L and the reduced residue containing Cu 43.2%, P 1.1%, Se 1.3%, U 0.33%. After reduction, vanadium is extracted by liquid ...

Embodiment 2

[0024] Take V 2 o 5 5.61g / L, Cu 0.17g / L, U 41mg / L, P 3.2g / L stone coal acid leaching solution 10000ml, add 220g ammonium sulfate and 50g ammonium carbonate, make the aluminum in the solution crystallize out in the form of ammonium alum , filter to obtain ammonium alum and the liquid after removing aluminum; add cupric chloride earlier to the liquid after removing aluminum, so that the concentration of copper in the solution rises to 1.1g / L Cu; add sodium monohydrogen phosphate to increase the uranium / phosphorus mol ratio in the solution To 1:120, then add sodium bicarbonate to adjust the pH to 1.5, then add sodium thiosulfate to 1.2 times the stoichiometric number of Fe(II) and V(IV) in the liquid after removing aluminum, and then add sodium thiosulfate, 60 Reduction at ℃ for 0.1h, aging for 3h, filtered to obtain a reduced liquid containing Cu 3mg / L, U<1mg / L and a reduced residue containing Cu 49.1%, Se 2.7%, P 2.2%, and U 1.8%. After reduction, vanadium is extracted by li...

Embodiment 3

[0026] Take V 2 o 56.38g / L, Cu 0.81g / L, U 1.0mg / L, P 4.1g / L stone coal acid leaching solution 3000ml, adjust the pH value to 2.5 with ammonia water first, so that the aluminum in the solution is crystallized in the form of ammonium alum , filtered to obtain ammonium alum and the solution after removing aluminum; since there is sufficient copper in the solution, and the uranium / phosphorus molar ratio has reached 1:4100, there is no need to supplement copper and phosphorus before reduction. Add zinc powder to the liquid after aluminum removal according to twice the stoichiometric number of iron and vanadium reduced to Fe(II) and V(IV), reduce at 15°C for 5h, age for 10h, filter to obtain Cu 1.5mg / L, U <1mg / L reduced liquid and reduced slag containing Cu 44.2%, Se 1.8%, P 1.1%, U 0.06%. After reduction, vanadium is extracted by liquid extraction, and the reduction slag is collected as raw materials for the separation and recovery of copper, selenium and uranium.

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Abstract

The invention relates to a method for comprehensively recycling copper, selenium and uranium from a stone coal extraction vanadic acid immersion liquid, which mainly comprises the following steps: crystallizing potassium alum or ammonia alum from stone coal sulfuric acid leach solution to remove aluminum, adding a copper-containing material and a phosphorus-rich material into the solution to regulate the copper concentration and the uranium / phosphorus ratio of the solution, adding an alkali to regulate the pH value, and adding a reducer to reduce and precipitate copper, selenium and uranium in the solution, thereby implementing efficient separation and enrichment of the copper, selenium and uranium in the stone coal vanadium extraction process. The invention has the advantages of simple technique, high copper / selenium / uranium recycling rate, low reagent consumption, low recycling cost, environment friendliness and the like.

Description

technical field [0001] The invention relates to a comprehensive recovery method for copper, selenium and uranium in an acid leaching solution for extracting vanadium from stone coal. The invention belongs to the technical field of dressing and smelting of vanadium ore. Background technique [0002] Stone coal is a vanadium-containing polymetallic mineral resource. In addition to vanadium, stone coal also contains carbon, silicon, phosphorus, aluminum, iron, potassium, copper, selenium, uranium and other elements. Stone coal contains V 2 o 5 More than 0.7% can be mined as vanadium ore, and the vanadium in stone coal is mainly composed of vanadium-containing illite (K(Al,V) 2 (Si,Al) 4 o 10 (OH) 2 ) form exists. The common process for extracting vanadium from stone coal is sulfuric acid leaching. At present, the following processes are mainly used to extract vanadium from stone coal acid leaching solution: [0003] 1) Stone coal sulfuric acid leaching solution → ammoni...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B15/00C22B60/02C01B19/02
CPCY02P10/20
Inventor 王学文魏远王明玉黄晓衡叶普洪陈太广向小艳吴志雄
Owner CENT SOUTH UNIV
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