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A method for selectively leaching vanadium from vanadium-containing stone coal

A selectivity, vanadium stone technology, applied in the direction of process efficiency improvement, etc., can solve the problems of reducing the purity of vanadium pentoxide, high iron ion content, affecting the enrichment process of vanadium, etc., to avoid the decline of the ability to enrich vanadium, Achieve separation and reduce impact

Active Publication Date: 2017-11-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, the existing leaching solution obtained from vanadium extraction from stone coal has the disadvantage of high content of iron ions, which not only affects the subsequent vanadium enrichment process, but also reduces the purity of the obtained vanadium pentoxide product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for selectively leaching vanadium from vanadium-containing stone coal. The concrete steps of this method are:

[0023] Step 1: Crush the vanadium-containing stone coal raw ore, and grind the ore until the particle size is less than 0.074 mm, accounting for 65-80 wt%, to obtain vanadium-containing stone coal ore powder.

[0024] Step 2, adding the vanadium-containing stone coal ore powder into water, the vanadium-containing stone coal ore powder added in every liter of water is 0.5~0.9kg; then add leaching agent, the leaching agent added in every liter of water is 0.3~0.8kg; then in Stir at 80-95°C for 3-6 hours, separate solid and liquid to obtain vanadium-containing leaching solution and leaching residue.

[0025] The leaching agent is a mixture of fluoride and oxalic acid, and the mass ratio of fluoride to oxalic acid in the leaching agent is 1:(8~13).

[0026] The grade of vanadium in the vanadium-containing stone coal raw ore is 0.3-0.7wt%, and the grade ...

Embodiment 2

[0029] A method for selectively leaching vanadium from vanadium-containing stone coal. The concrete steps of this method are:

[0030] Step 1: Crush the vanadium-containing stone coal raw ore, and grind the ore until the particle size is less than 0.074 mm, accounting for 65-80 wt%, to obtain vanadium-containing stone coal ore powder.

[0031] Step 2, adding the vanadium-containing stone coal ore powder into water, the vanadium-containing stone coal ore powder added in every liter of water is 0.85~1.25kg; then add leaching agent, the leaching agent added in every liter of water is 0.5~1kg; then in 85 Stir at ~100°C for 5~7h, separate solid and liquid to obtain vanadium-containing leaching solution and leaching residue.

[0032] The leaching agent is a mixture of fluoride and oxalic acid, and the mass ratio of fluoride to oxalic acid in the leaching agent is 1:(10-15).

[0033] The vanadium grade in the vanadium-containing stone coal raw ore is 0.5~0.9wt%, and the iron grade ...

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Abstract

The invention relates to a method for selectively leaching vanadium from vanadium-contained stone coals. The method comprises the following steps: firstly, a crude ore of the vanadium-contained stone coals is crushed, and is ground to obtain vanadium-contained stone coal mineral powder with particle sizes lower than 0.074 mm of 65-80 wt%; the vanadium-contained stone coal mineral powder is added in water; 0.5-1.25 kg vanadium-contained stone coal mineral powder is added in each liter of water; then, a leaching agent is added; 0.3-1 kg leaching agent is added in each liter of water; the stirring is performed by 3-7 h under the condition of 80-100 DEG C; and the solid-liquid separation is performed to obtain vanadium-contained leaching liquid and leaching slag. The leaching agent is a mixture consisting of fluorides and oxalic acid; the mass ratio of the fluorides to the oxalic acid in the leaching agent is 1: (8-15); and the fluorides are more than one of calcium fluoride, sodium fluoride, potassium fluoride, ammonia fluoride and ammonium bifluoride. The method can selectively leach vanadium from the vanadium-contained stone coals, realizes effective separation of vanadium and impurity iron, obtains the vanadium-contained leaching liquid with low iron content, and reduces the influence of iron on subsequent process.

Description

technical field [0001] The invention belongs to the technical field of vanadium-containing stone coal leaching. Specifically, it relates to a method for selectively leaching vanadium from vanadium-containing stone coal. Background technique [0002] The vanadium-containing stone coal is usually obtained by adding sulfuric acid and a leaching agent to obtain a vanadium-containing leaching solution. The main leaching agent is a fluorine-containing compound. Excessive iron concentration in the vanadium leaching solution will reduce the ability of the subsequent extraction or ion exchange process to enrich vanadium, and will also affect the purity of the subsequent vanadium pentoxide product. [0003] Liu Daxue et al. (Liu Daxue, Li Yanjiang, Chang Yaochao, Wang Yun, Yuan Chaoxin, Guo Chihao. Expanded test of direct sulfuric acid leaching process of stone coal vanadium ore [J]. Mining and Metallurgy, 2013, 22(4): 60-66.) Two-stage leaching is adopted, the first-stage leaching ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22
CPCC22B34/22Y02P10/20
Inventor 张一敏胡鹏程刘涛黄晶陈铁军
Owner WUHAN UNIV OF SCI & TECH
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