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Leaching method for stone coal vanadium extraction

A stone coal and leaching technology, which is applied in the field of vanadium extraction from stone coal, can solve the problems of trivalent vanadium difficult to be effectively released and mica lattice binding, etc., to achieve efficient release, increase the leaching rate, and increase the effect of the reaction interface

Active Publication Date: 2017-05-31
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the stable structure of mica minerals in stone coal, the trivalent vanadium is bound by the mica lattice, and it is difficult to effectively release the trivalent vanadium only by the oxidation of ferric ions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A leaching method for extracting vanadium from stone coal. The concrete steps of the leaching method described in the present embodiment are:

[0032] Step 1. Grinding

[0033] The stone coal raw ore is finely ground to a particle size of less than 74 μm, accounting for 75-81 wt%, to obtain stone coal powder.

[0034] Step two, hydrochloric acid activation

[0035] The hydrochloric acid solution is mixed with the stone coal powder at a liquid-solid ratio of 1.2-1.5 L / kg, and activated at room temperature for 30-51 minutes to obtain activated pulp.

[0036] The volume concentration of the hydrochloric acid solution is 4-8%.

[0037] Step three, mixing

[0038] Adding the activated pulp into concentrated sulfuric acid, mixing evenly, and then adding an exciter and a calcium-based carrier to obtain the pre-leaching pulp. in:

[0039] The volume ratio of the activated pulp to the concentrated sulfuric acid is 1: (0.09~0.11);

[0040] The mass ratio of sulfate ion in ...

Embodiment 2

[0051] A leaching method for extracting vanadium from stone coal. The concrete steps of the leaching method described in the present embodiment are:

[0052] Step 1. Grinding

[0053] The stone coal raw ore is finely ground to a particle size of less than 74 μm, accounting for 77-83 wt%, to obtain stone coal powder.

[0054] Step two, hydrochloric acid activation

[0055] The hydrochloric acid solution is mixed with the stone coal powder at a liquid-solid ratio of 1.25-1.55 L / kg, and activated at room temperature for 32-53 minutes to obtain activated pulp.

[0056] The volume concentration of the hydrochloric acid solution is 4-8%.

[0057] Step three, mixing

[0058] Adding the activated pulp into concentrated sulfuric acid, mixing evenly, and then adding an exciter and a calcium-based carrier to obtain the pre-leaching pulp. in:

[0059] The volume ratio of the activated pulp to the concentrated sulfuric acid is 1: (0.10~0.12);

[0060] The mass ratio of sulfate ion i...

Embodiment 3

[0071] A leaching method for extracting vanadium from stone coal. The concrete steps of the leaching method described in the present embodiment are:

[0072] Step 1. Grinding

[0073] The stone coal raw ore is finely ground to a particle size of less than 74 μm, accounting for 79-85 wt%, to obtain stone coal powder.

[0074] Step two, hydrochloric acid activation

[0075] The hydrochloric acid solution is mixed with the stone coal powder at a liquid-solid ratio of 1.3-1.6 L / kg, and activated at room temperature for 34-55 minutes to obtain activated pulp.

[0076] The volume concentration of the hydrochloric acid solution is 4-8%.

[0077] Step three, mixing

[0078] Adding the activated pulp into concentrated sulfuric acid, mixing evenly, and then adding an exciter and a calcium-based carrier to obtain the pre-leaching pulp. in:

[0079] The volume ratio of the activated pulp to the concentrated sulfuric acid is 1: (0.11~0.13);

[0080] The mass ratio of sulfate ion in ...

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Abstract

The invention relates to a leaching method for stone coal vanadium extraction. According to the technical scheme, stone coal raw ore is subjected to fine grinding, and stone coal powder is obtained; a hydrochloric acid solution and the stone coal powder are mixed according to the liquid-to-solid ratio being 1.2-1.7 L / kg and activated, and ore pulp obtained after activating is obtained; the ore pulp obtained after activating is added in concentrated sulfuric acid to be mixed evenly, an exciting agent and a calcium-based carrier are added, and ore pulp before leaching is obtained, wherein the volume ratio of the ore pulp obtained after activating to the concentrated sulfuric acid is 1:(0.09-0.15), the mass ratio of sulfate ions in the exciting agent to the stone coal powder is (0.019-0.058):1, and the mass ratio of calcium ions in the calcium-based carrier to the stone coal powder is (0.005-0.022):1; the ore pulp before leaching is fed into an autoclave, leaching is conducted for 1-3 h under the conditions that the temperature ranges from 130 DEG C to 160 DEG C and the oxygen partial pressure is 0.5-1.5 MPa, solid and liquid separation is conducted, and pickle liquor and acid leaching residues are obtained. The leaching method has the beneficial effects of being efficient, environment-friendly and high in vanadium leaching rate.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction from stone coal. Specifically relates to a leaching method for extracting vanadium from stone coal. Background technique [0002] Stone coal is an important vanadium-containing resource in my country. It has abundant reserves in China. The reserves of vanadium contained in it are 118 million tons in terms of V2O5, accounting for 87% of the total domestic reserves. Mica-type vanadium-bearing stone coal is a kind of primary stone coal vanadium ore that is difficult to treat. Most of the vanadium is V (Ⅲ), which occurs in the lattice structure of mica minerals. The content of V (Ⅳ) and V (Ⅴ) lower. In order to ensure a high vanadium leaching rate, the traditional atmospheric pressure direct acid leaching requires a large amount of acid and a long leaching time, which leads to low leaching efficiency and is not conducive to subsequent pH adjustment. Therefore, it is necessary to develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/10C22B3/08C22B34/22
CPCC22B3/08C22B3/10C22B34/22Y02P10/20
Inventor 张一敏薛楠楠黄晶刘涛陈铁军
Owner WUHAN UNIV OF SCI & TECH
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