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A method for leaching vanadium from vanadium-containing shale ore

A shale mine and leaching technology, applied in the field of hydrometallurgy and vanadium leaching, can solve the problems of long process flow, high consumption and large consumption of chemicals, and achieve the effects of simple impurity treatment operation, shortened process flow and reduced production cost.

Inactive Publication Date: 2016-08-17
全喆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is to get higher V 2 o 5 leaching rate, had to consume a large amount of H 2 SO 4 , in production H 2 SO 4 The dosage is generally 25-35% of the ore mass, V 2 o 5 The leaching rate is generally around 65% to 75%, and rarely exceeds 80%. V 2 o 5 The recovery rate generally does not exceed 70%; the second is that the purification and removal of impurities in the acidic leaching solution, the reduction of Fe(III) and the adjustment of the pH value need to consume a large amount of chemicals, resulting in long process flow, complicated operation, and problems.
And in the process of H 2 SO 4 Too much consumption is a key factor affecting production costs, and it is of little economic significance to apply it in production, and the products produced by it have low ability to resist market risks

Method used

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  • A method for leaching vanadium from vanadium-containing shale ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 gets vanadium grade (with V 2 o 5 1.05% vanadium-containing stone coal ore, crushed and wet-grinded to a particle size of 0.21mm (120 mesh), the volume-to-mass ratio of water and vanadium-containing stone coal ore in the ore slurry obtained by grinding is 1.5: 1, added by The solution prepared by ammonium sulfate and mixed alkali is still leaching vanadium according to the liquid-solid ratio of 2.5:1; in the prepared solution: the concentration of ammonium persulfate is 20g / L, the concentration of ammonia water is 2.8mol / L, and the concentration of ammonium ion 4.3mol / L (add a small amount of ammonium carbonate to fine-tune the ammonium ion concentration). The leaching process is carried out under normal temperature and pressure, and supplemented by stirring at a speed of 160rpm, the leaching time is 3h, and the vanadium-containing leaching solution is obtained through liquid-solid separation after leaching, and the vanadium leaching rate (in V 2 o 5 Tot...

Embodiment 2

[0018] Embodiment 2 gets vanadium grade (with V 2 o 5 0.93% vanadium-containing stone coal ore, crushing and wet grinding to a particle size of 0.21mm (120 mesh), the volume-to-mass ratio of water and vanadium-containing stone coal ore in the ore slurry obtained by grinding is 1.5: l, adding the The solution prepared by ammonium sulfate and mixed alkali is still leaching vanadium according to the liquid-solid ratio of 3.0:1; in the prepared solution: the concentration of ammonium persulfate is 26g / L, the concentration of ammonia water is 3.2mol / L, and the concentration of ammonium ion is 4.7mol / L (add a small amount of ammonium carbonate to fine-tune the ammonium ion concentration). The leaching process is carried out under normal temperature and pressure, and supplemented by stirring at a speed of 160rpm, the leaching time is 3h, and the vanadium-containing leaching solution is obtained through liquid-solid separation after leaching, and the vanadium leaching rate (in V 2 o...

Embodiment 3

[0019] Embodiment 3 gets vanadium grade (with V 2 o 5 0.93% vanadium-containing stone coal ore, crushing and wet grinding to a particle size of 0.21mm (120 mesh), the volume-to-mass ratio of water and vanadium-containing stone coal ore in the ore slurry obtained by grinding is 1.5: l, adding the The solution prepared by ammonium sulfate and mixed alkali is still leaching vanadium according to the liquid-solid ratio of 3.5:1; in the prepared solution: the concentration of ammonium persulfate is 30g / L, the concentration of ammonia water is 3.4mol / L, and the concentration of ammonium ion is 5.0mol / L (add a small amount of ammonium carbonate to fine-tune the ammonium ion concentration). The leaching process is carried out under normal temperature and pressure, and supplemented by stirring at a speed of 160rpm, the leaching time is 3h, and the vanadium-containing leaching solution is obtained through liquid-solid separation after leaching, and the vanadium leaching rate (in V 2 o...

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Abstract

The invention relates to a method for extracting vanadium from vanadium-containing shale by cooperating ammonium persulfate with mixed alkali, and belongs to the field of hydrometallurgy. The method comprises the following steps of: crushing and finely grinding vanadium-containing shale ore, adding extracting solution prepared from the ammonium persulfate and the mixed alkali, and extracting at normal temperature and normal pressure; performing solid-liquid separation to obtain vanadium-containing extract, purifying the extract, and regulating the pH value of the extract; enriching vanadium ions to obtain vanadium precipitating mother solution, removing impurities such as silicon, phosphorus and the like from the vanadium precipitating mother solution, and adding ammonia water or ammonium salt to obtain an ammonium polyvanadate precipitate; and calcining ammonium polyvanadate to obtain vanadium pentoxide. By the method, material consumption is reduced, the process flow is shortened, the impurities are easy to treat, production cost can be reduced by 15 to 25 percent, and the extraction rate of the vanadium in the vanadium-containing shale ore is high and stable.

Description

technical field [0001] The invention relates to a method for leaching vanadium from vanadium-containing shale with ammonium persulfate and mixed alkali, belonging to the category of hydrometallurgy. Background technique [0002] Vanadium is an important material for the preparation of high-tech products such as special steel, vanadium-titanium alloys, catalysts, and vanadium flow energy storage batteries, and is widely used in modern industrial technology. Vanadium ore resources mainly include vanadium-titanium magnetite and vanadium-bearing shale (including carbonaceous shale, argillaceous shale, etc.). Vanadium-bearing shale accounts for 87% of the total reserves of vanadium in my country and is an important resource of vanadium. [0003] Vanadium-bearing shale ore is the main vanadium-containing resource exploited as a single vanadium deposit in my country. 2 o 5 The meter is generally around 1.0%. The vanadium in vanadium-bearing shale is mainly V(III), some V(IV), a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/14C22B3/24C22B34/22
CPCY02P10/20
Inventor 全喆丁一刚王亚池
Owner 全喆