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Leaching method of vanadium in vanadium-containing stone coal

A vanadium stone and leaching technology, which is applied in the field of vanadium extraction, can solve the problems of environmental pollution, vanadium leaching rate decline, loss, etc.

Inactive Publication Date: 2010-07-14
GUANGZHOU RES INST OF NON FERROUS METALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of a large amount of fluorite not only consumes a large amount of sulfuric acid, but also produces too much hydrofluoric acid, which has no time to react with coal, causing losses and seriously polluting the environment
At the same time, the latter also uses ammonia water to neutralize the leaching solution, and the ammonium ions brought by the ammonia water cause the ammonium ions in the wastewater to exceed the standard
Wastewater also contains a large amount of SO 4 2- ions, if this part of wastewater is reused, the ammonium ions and SO 4 2- Ions continue to accumulate, resulting in a significant drop in vanadium leaching rate
The use of ammonia water to neutralize the leaching solution not only wastes a lot of water resources, but also the treatment of ammonia nitrogen in wastewater will lead to an increase in production costs

Method used

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  • Leaching method of vanadium in vanadium-containing stone coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] ① 100g vanadium-containing stone coal containing 1.25% vanadium is crushed, ball-milled to 80 mesh, and then added to the reaction kettle, 12g 98% sulfuric acid and 2.5g fluorite are added, and water is added to control the liquid-solid weight ratio to 1:1, and react at 90°C for 10 hours Then, liquid-solid separation was performed to obtain 100 g of leachate.

[0019] ②After adjusting the pH of the leaching solution to 2.5 with lime milk, at room temperature, extract the leaching solution with 100g 10% P204 and 5% TBP extractant diluted with kerosene at 7 levels, and the raffinate is returned to the reactor with 7 level sulfuric acid with a concentration of 3N The organic phase is loaded by back extraction to obtain a back extraction solution rich in vanadium ions.

[0020] ③After adding 0.75g sodium chlorate to the stripping solution, adding 12% ammonia water to adjust the pH to 2.2, filtering and washing the precipitate, calcining the precipitate in an electric calciner at...

Embodiment 2

[0023] ① 100g vanadium-containing stone coal containing 1.18% vanadium is crushed, ball-milled to 80 mesh, and then added to the reactor, 20g 98% sulfuric acid, 2.5g fluorite and 0.2g sodium chlorate are added, and water is added to control the liquid-solid weight ratio to 1:1 After reacting at 90°C for 2h, add 1g of fluorite, and after leaching at 90°C for 10h, liquid-solid separation to obtain 100g of leaching solution.

[0024] ②After adjusting the pH of the leaching solution to 2.5 with lime milk, at room temperature, the leaching solution is extracted with 100g 10% P204 and 5% TBP extractant diluted with kerosene at 7 levels, and the raffinate is returned to the reactor with 2N sulfuric acid 7 The organic phase is loaded by stage back extraction to obtain a back extraction liquid rich in vanadium ions.

[0025] ③After adding 0.65g sodium chlorate to the stripping solution, adding 12% ammonia water to adjust the pH to 2.2, filtering and washing the precipitate, calcining the pr...

Embodiment 3

[0028] ① 100g vanadium-containing stone coal containing 0.96% vanadium is crushed, ball-milled to 80 mesh, and then added to the reaction kettle, 25g 98% sulfuric acid, 4.0g fluorite and 0.3g sodium chlorate are added, and water is added to control the liquid-solid weight ratio to 1:1 After reacting at 90°C for 2h, add 2g of fluorite. After reacting for 2h, add the remaining 2g of fluorite. After leaching at 90°C for 10h, liquid-solid separation yields 100g of leachate.

[0029] ②After adjusting the pH of the extract with lime milk to 2.5, at room temperature, extract the extract with 100g of 10% P204 and 5% TBP extractant diluted with kerosene at 7 levels. The raffinate is returned to the reaction kettle with 7 levels of 2N sulfuric acid. The organic phase is loaded by back extraction to obtain a back extraction solution rich in vanadium ions.

[0030] ③After adding 0.60g of sodium chlorate to the stripping solution, adding 12% ammonia water to adjust the pH to 2.2, filtering and ...

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Abstract

The invention relates to a leaching method of vanadium in vanadium-containing stone coal. The leaching method is characterized by comprising the following steps of: adding 98 percent of sulfate and fluorite into the vanadium-containing stone coal, adding water, controlling the liquid-solid weight ratio, leaching and filtering to obtain leachate; regulating the pH value of the leachate by using lime milk, extracting the leachate at room temperature by using 10 percent of P204 and 5 percent of TBP which are diluted by using kerosene, and carrying out back extraction on a load organic phase by using the sulfate; and after adding sodium chlorate into back extraction liquid, adding ammonia water, regulating the pH value, filtering and calcining a precipitate to obtain vanadium pentoxide. The method has simple process, high vanadium leaching rate, little reagent consumption quantity and little pollution and realizes the recycle of wastewater. The method is suitable for leaching the vanadium in the vanadium-containing stone coal.

Description

Technical field [0001] The invention relates to a method for extracting vanadium from stone coal vanadium ore. Background technique [0002] Vanadium-bearing stone coal is the main vanadium ore resource in my country. The mass fraction of vanadium pentoxide is very high, generally above 0.5%. There are only a few stone coal vanadium ore with a mass fraction above 1.0. There are abundant vanadium-bearing coal deposits in Hunan, Hubei, Zhejiang, Shaanxi and other provinces. [0003] Research on the material composition of stone coal has shown that the material composition of vanadium-bearing stone coal is relatively complex, and the occurrence and valence of vanadium vary widely, and the dispersion is subtle. In the same ore body, there are usually more than three kinds of vanadium minerals: (1) Most of the vanadium in stone coal exists in the form of V(III) in clay minerals such as mica and kaolinite, which partially replaces silica octahedron. The Al(III) in the multiple network ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/08C22B3/26
CPCY02P10/20
Inventor 戴子林谷利君
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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