Method for leaching vanadium from vanadium-containing coal mine

A technology for coal mines and vanadium stone, which is applied in the field of hydrometallurgy extraction of rare high melting point metals, can solve the problems of low vanadium conversion leaching rate, low production efficiency, high vanadium leaching rate, etc., and achieves efficient direct leaching and reduced reaction time. , the effect of process strengthening

Inactive Publication Date: 2009-07-15
KUNMING UNIV OF SCI & TECH
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

Regardless of the additives used, the roasting process will inevitably produce flue gas or Cl 2 , HCl and other harmful gases, serious environmental pollution, and the conversion and leaching rate of vanadium is low, generally 50% to 60%
[0008] At present, some manufacturers use the full wet method to extract vanadium from stone coal mines, but most of them are limited to atmospheric pressure leaching, and cannot stably obtain a high vanadium leaching rate, which is as high as 85% or about 50%.
In the leaching of stone coal mines under n

Method used

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  • Method for leaching vanadium from vanadium-containing coal mine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Stone coal contains 1.84% vanadium, and the ore sample is ground to 200 mesh, accounting for 85%.

[0023] One-stage oxygen pressure acid leaching: the vanadium-containing stone coal mine is mixed with a sulfuric acid solution with a concentration of 200g / L, and the solid-liquid mass volume ratio is controlled to be 1:1.2. Pressure 1.2MPa, conversion temperature 150°C, leaching reaction for 180 minutes, solid-liquid separation to obtain a vanadium-containing leaching solution and a leaching residue. The first-stage vanadium-containing leaching solution is processed through recovery of residual acid-extraction-reverse extraction-oxidation vanadium precipitation-pyrolysis to obtain vanadium pentoxide product, and the first-stage leaching residue enters the second-stage oxygen pressure acid leaching process.

[0024] Two-stage oxygen pressure acid leaching: Slurry the first-stage leaching slag and sulfuric acid solution with a concentration of 300g / L, control the solid-liq...

Embodiment 2

[0027] Stone coal contains 0.507% vanadium, and the ore sample is ground to 200 mesh, accounting for 95%.

[0028] One-stage oxygen pressure acid leaching: the vanadium-containing stone coal mine is mixed with sulfuric acid solution with a concentration of 180g / L, and the solid-liquid mass volume ratio is controlled to be 1:1.5. Pressure 1.5MPa, conversion temperature 120°C, leaching reaction for 120 minutes, solid-liquid separation to obtain a vanadium-containing leaching solution and a leaching residue. The first-stage vanadium-containing leaching solution is processed through recovery of residual acid-extraction-reverse extraction-oxidation vanadium precipitation-pyrolysis to obtain vanadium pentoxide product, and the first-stage leaching residue enters the second-stage oxygen pressure acid leaching process.

[0029] Two-stage oxygen pressure acid leaching: Slurry the first-stage leaching slag and sulfuric acid solution with a concentration of 250g / L, and control the solid-...

Embodiment 3

[0032] Stone coal contains 1.07% vanadium, and the ore sample is ground to 200 mesh, accounting for 85%.

[0033] One-stage oxygen pressure acid leaching: the vanadium-containing stone coal mine is mixed with sulfuric acid solution with a concentration of 250g / L, and the solid-liquid mass volume ratio is controlled to be 1:3. Pressure 2.0MPa, conversion temperature 180°C, leaching reaction for 240 minutes, solid-liquid separation to obtain a vanadium-containing leaching solution and a leaching residue. The first-stage vanadium-containing leaching solution is processed through recovery of residual acid-extraction-reverse extraction-oxidation vanadium precipitation-pyrolysis to obtain vanadium pentoxide product, and the first-stage leaching residue enters the second-stage oxygen pressure acid leaching process.

[0034] Two-stage oxygen pressure acid leaching: Slurry the first-stage leaching slag and sulfuric acid solution with a concentration of 300g / L, control the solid-liquid ...

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Abstract

The invention relates to a method for leaching vanadium from vanadium-containing bone coal, and belongs to the technical field of metallurgical wet extraction of high-melting-point rare metals. The method adopting the two-stage oxygen pressure acid leaching process comprises the following steps: milling the bone coal; size-mixing with a sulfuric acid solution; and loading in a pressure kettle to acid-leaching in the presence of oxygen. The low-valence vanadium in a coal sample can be converted into the soluble quadrivalent vanadium, and the procedures, such as calcining, dust-collecting, leaching and the like, in the conventional process of 'calcining-leaching' can be concentrated during the procedure of pressure leaching to simplify the process and intensify the procedure, thereby greatly reducing the reaction time, directly and effectively leaching the vanadium-containing bone coal and ensuring that the leaching rate of the vanadium is as high as above 86% by adopting the two-stage oxygen pressure acid leaching process.

Description

technical field [0001] The invention relates to a method for leaching vanadium from vanadium-containing stone coal mines, and belongs to the technical field of wet extraction metallurgy of rare high-melting point metals. Background technique [0002] Vanadium is an important strategic resource. With the progress and development of industrial technology, vanadium has more and more applications in steel, non-ferrous metal alloys, petrochemical and organic synthesis industries. There are two main resources for extracting vanadium in my country, one is vanadium-titanium magnetite, and the other is vanadium-containing stone coal. The former is the main resource for the production of vanadium pentoxide in my country; while the latter has abundant reserves in my country, which is characterized by low calorific value, high ash content, and often associated with various metal elements, such as vanadium, molybdenum, silver, yttrium, selenium, molybdenum , Nickel, among which vanadium ...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/22C22B34/22
CPCY02P10/20
Inventor 魏昶李存兄樊刚李旻廷
Owner KUNMING UNIV OF SCI & TECH
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