Acidolysis oxidation conversion method for extracting vanadium from stone coal

A technology of acidolysis oxidation and stone coal, which is applied in the field of vanadium extraction, can solve the problems of valence metal dispersion, large consumption of reagents, and large environmental pollution, and achieve the effect of mild reaction conditions, small consumption of reagents and low equipment requirements

Inactive Publication Date: 2008-07-02
谢桂文
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the conventional technology mainly adopts the method of high-temperature roasting with salt, the roasting reaction is basically a surface chemical reaction, and because the vanadium content in stone coal is low (about 1%), the addition of salt is limited, and the behavior of barium minerals is complicated. The metal recovery rate is low (40%), the valuable metals are scattered, the consumption of reagents is large, it is difficult to overcome the complexity of minerals, it is difficult to separate vanadium in minerals, and it has great environmental pollution
Even the recently announced acid leaching technology is completed under high acid, high temperature and high pressure, the equipment structure is complicated, the investment is large, and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take 10 tons of stone coal (containing 0.82% vanadium), crush it, and grind it into 80 mesh powder; (2) Add 765 kg of water, 1.7 tons of 98% industrial sulfuric acid, stir evenly, and open and stack for 16 days; (3) Add 15 tons of water , stirred for 3 hours; (4) the solution contained ferrous iron and ferric iron 4 grams per liter, so 240 kilograms of reducing agent sodium thiosulfate was added to reduce the iron contained in the solution; (5) the pH value was adjusted to 2.5, heated to 30-60°C, filtered to obtain a blue filtrate containing vanadyl sulfate.

[0023] The tailings were cleaned and assayed. The vanadium content in the tailings was 0.095%, and the vanadium leaching rate was 88.41%.

Embodiment 2

[0025] (1) Get 10 tons of stone coal (containing 0.82% vanadium), crush it, and grind it into a 120-mesh powder; (2) Add 900 kilograms of water, 2.0 tons of 98% industrial sulfuric acid, stir evenly, and open and stack for 20 days; (3) Add 20 tons of water , stirred for 3.5 hours; (4) adding 240 kg of reducing agent sodium thiosulfate; (5) adjusting the pH value to 2.5, heating to 30°C, and filtering to obtain a blue vanadyl sulfate solution.

[0026] The tailings were cleaned and assayed. The vanadium content in the tailings was 0.082%, and the vanadium leaching rate was 90.0%.

[0027] (1) Take 10 tons of stone coal (containing 0.82% vanadium), crush it, and grind it into 80 mesh powder; (2) Add 700 kilograms of water, 1.6 tons of 98% industrial sulfuric acid, stir evenly, and open and stack for 30 days; (3) Add 25 tons of water , stirred for 3.5 hours; (4) adding 240 kg of reducing agent sodium thiosulfate; (5) adjusting the pH value to 2.5, heating to 40°C, and filtering t...

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Abstract

A method for extracting vanadium in stone coal by acidolysis, oxidation and conversion comprises the following steps: (1) pulverizing stone coal and grinding to powder of 60 to 120 meshes; (2) adding water and concentrated sulfuric acid according to a weight ratio of stone coal powder to concentrated sulfuric acid to water of 100:(15-25):(6-10), stirring uniformly and standing for 16 to 60 days in an open manner; (3) adding water according to a solid-to-liquid ratio of 1:(1-5) and stirring for 1 to 4 h; (4) adding reducer sodium hyposulfite according to the content of Fe contained in the solution to reduce Fe in the solution if Fe(II) or/and Fe(III) is/are contained in the solution; and (5) adjusting pH value to 2 to 3, heating to 30 to 60 DEG C, and filtering to obtain a blue filtrate containing vanadyl sulfate. The invention has the advantages of simple process, low requirement for equipment, high vanadium leaching efficiency (not less than 88%), less reagent consumption, less pollution, etc.

Description

technical field [0001] The invention relates to a method for extracting vanadium from vanadium-containing stone coal, in particular to a method for leaching vanadium in stone coal through acidolysis oxidation transformation. Background technique [0002] Stone coal is a high-quality combustible mineral formed by bacteria, algae and lower organisms in a shallow sea reducing environment. It is characterized by high ash content, low calorific value, and an appearance like black stone. Stone coal mostly contains valuable metals such as vanadium, phosphorus, copper, aluminum, uranium, manganese, etc. Among them, stone coal containing vanadium is the only single mineral resource of vanadium, so it is an important vanadium resource. [0003] The material composition of vanadium-bearing stone coal is complex, and the occurrence state and occurrence state of vanadium are various and finely dispersed. There are usually more than five kinds of vanadium minera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/08
CPCY02P10/20
Inventor 谢桂文
Owner 谢桂文
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