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A method for leaching vanadium from mica-type vanadium-containing stone coal

A vanadium stone and leaching technology, which is applied in the field of leaching vanadium, can solve the problems of insignificant leaching effect, low direct conversion efficiency, and high investment cost, and achieve the effects of increasing vanadium extraction efficiency, high vanadium extraction efficiency, and low pollution

Active Publication Date: 2018-03-02
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] "A method for leaching vanadium from vanadium-containing stone coal mines" (CN101481755A) patented technology uses a two-stage oxygen pressure acid leaching process to leach vanadium under the action of oxygen and sulfuric acid, but the two-stage oxygen pressure acid leaching time Long time, high equipment investment cost
"Method for leaching vanadium from stone coal under pressure field" (CN1904092A) patent technology, adding oxidant (oxygen or air) in the oxygen pressure acid leaching process, the direct conversion efficiency of vanadium is low, and the leaching effect is not significant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for leaching vanadium from mica-type vanadium-containing stone coal. The concrete steps of described method are:

[0024] Step 1: Crushing and finely grinding the mica-type vanadium-containing stone coal to obtain stone coal powder; in the stone coal powder, the powder with a particle size of less than 74 μm accounts for 75-85 wt%.

[0025] Step 2, mixing the stone coal powder with a sulfuric acid solution with a volume concentration of 18-20% at a liquid-solid ratio of 1500-1600 L / ton to obtain a mixed pulp.

[0026] Step 3: adding a leaching additive to the mixed pulp, the ratio of the amount of sulfate ions in the leaching additive to the mass of stone coal powder in the mixed pulp is 200-300 mol / ton.

[0027] Step 4: Put the mixed pulp with leaching additives into the pressurized reaction kettle, and then feed oxygen into it.

[0028] Leach under the conditions of 0.5~1.0MPa and 140℃~160℃ for 2~3h to obtain acid leaching slurry.

[0029] Step 5: Separati...

Embodiment 2

[0033] A method for leaching vanadium from mica-type vanadium-containing stone coal. The concrete steps of described method are:

[0034] Step 1: Crushing and finely grinding the mica-type vanadium-containing stone coal to obtain stone coal powder; in the stone coal powder, the powder with a particle size of less than 74 μm accounts for 80-90 wt%.

[0035] Step 2, mixing the stone coal powder with a sulfuric acid solution with a volume concentration of 18-20% at a liquid-solid ratio of 1550-1650 L / ton to obtain a mixed pulp.

[0036] Step 3: adding a leaching additive to the mixed pulp, the ratio of the amount of sulfate ions in the leaching additive to the mass of stone coal powder in the mixed pulp is 250-350 mol / ton.

[0037] Step 4: Put the mixed pulp with leaching additives into the pressurized reaction kettle, and then feed oxygen into it.

[0038] Leach under the conditions of 0.8~1.3MPa and 145℃~165℃ for 3~4h to obtain acid leaching slurry.

[0039] Step 5: Separati...

Embodiment 3

[0043] A method for leaching vanadium from mica-type vanadium-containing stone coal. The concrete steps of described method are:

[0044] Step 1: Crushing and finely grinding the mica-type vanadium-containing stone coal to obtain stone coal powder; in the stone coal powder, the powder with a particle size of less than 74 μm accounts for 85-95 wt%.

[0045] Step 2, mixing the stone coal powder with a sulfuric acid solution with a volume concentration of 18-20% at a liquid-solid ratio of 1600-1700 L / ton to obtain a mixed pulp.

[0046] Step 3: adding a leaching additive to the mixed pulp, the ratio of the amount of sulfate ions in the leaching additive to the mass of stone coal powder in the mixed pulp is 300-400 mol / ton.

[0047] Step 4: Put the mixed pulp with leaching additives into the pressurized reaction kettle, and then feed oxygen into it.

[0048] Leach under the conditions of 1.0~1.5MPa and 150℃~170℃ for 4~5h to obtain acid leaching slurry.

[0049] Step 5: Separati...

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Abstract

The invention relates to a method for leaching vanadium from mica-type vanadium-bearing stone coal. According to the technical scheme, the mica-type vanadium-bearing stone coal is crushed and fine-ground to obtain stone coal powder materials; the stone coal powder materials and a sulfuric acid solution with the volume concentration being 18%-20% are subjected to slurry mixing according to the liquid-solid ratio of 1500-1700L / t to obtain a mixed ore pulp; a leaching additive is added into the mixed ore pulp, and the ratio of the amount of substance of sulfate ions in the leaching additive to the mass of the stone coal powder materials in the mixed ore pulp is 200-400 mol / t; the mixed ore pulp with the leaching additive is fed into a pressurized reaction kettle, then oxygen is led in, and leaching is conducted for 2-5 h under the conditions of 0.5-1.5 MPa and 140 DEG C-170 DEG C to obtain an acid leaching pulp; and the acid leaching pulp is subjected to solid-liquid separation to obtain acidic leaching liquid and leaching residues. The method has the characteristics of being high in vanadium extraction efficiency and low in pollution.

Description

technical field [0001] The invention belongs to the technical field of vanadium-containing stone coal. Specifically relates to a method for leaching vanadium from mica-type vanadium-containing stone coal. Background technique [0002] As an important vanadium-containing resource in my country, stone coal is rich in reserves. Extracting vanadium from vanadium-containing stone coal is an important way to obtain vanadium. Mica-type vanadium-bearing stone coal is a kind of primary stone coal vanadium ore, which mainly occurs in the lattice structure of mica minerals, and V(IV) and V(V) are in the form of free oxide adsorption exist. Since V(Ⅳ) and V(Ⅴ) are in the free state of oxides and are soluble in acid, they are easy to be extracted by acid leaching, while V(Ⅲ) needs to be dissolved through the structure of mica minerals to get a good release. [0003] Liu Tao et al. (Liu Tao, Huang Jun, Zhang Yimin, Huang Jing. Research on acid leaching vanadium extraction process of mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22C22B3/08
CPCC22B3/08C22B34/22Y02P10/20
Inventor 张一敏薛楠楠刘涛黄晶陈铁军
Owner WUHAN UNIV OF SCI & TECH
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