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Method for extracting tungsten through scheelite decomposing

A technology of scheelite and mass percentage, applied in the field of decomposing scheelite to extract tungsten, to achieve the effect of increasing kinetic rate, reducing emission and reagent cost, and reducing burden

Active Publication Date: 2019-04-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most importantly, the corrosion and volatilization problems of hydrochloric acid are still unavoidable in this method

Method used

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  • Method for extracting tungsten through scheelite decomposing
  • Method for extracting tungsten through scheelite decomposing
  • Method for extracting tungsten through scheelite decomposing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Scheelite (containing WO 3 51%) into the prepared mixed solution, control the H 2 SO 4 The concentration is 2.0mol / L, H 2 o 2 The concentration is 3.0mol / L, the leaching temperature is 50℃, the leaching time is 3h, the liquid-solid ratio is 8:1, the tungsten leaching rate is 98.2%. After filtering and washing, the filter cake is washed three times with pure water to obtain the leaching residue, which is characterized by XRD Figure and SEM image as figure 1 , as shown in 2.

Embodiment 2

[0026] Scheelite (containing WO 3 57%) into the prepared mixed solution, control the H 2 SO 4 The concentration is 1.5mol / L, H 2 o 2 The concentration is 3.5mol / L, the leaching temperature is 60°C, the leaching time is 3h, the liquid-solid ratio is 8:1, and the tungsten leaching rate is 99.0%. After filtering and washing, the filter cake is washed three times with pure water to obtain the leaching residue. The filtrate is thermally decomposed at 90°C, and the precipitation rate of tungsten is 99.3%. The XRD and SEM images of the obtained tungstic acid are as follows image 3 , as shown in 4. The mother liquor is supplemented with consumed sulfuric acid and hydrogen peroxide to return to leaching.

Embodiment 3

[0028] Scheelite (containing WO 3 62%) into the prepared mixed solution, control the H 2 SO 4 The concentration is 2.5mol / L, H 2 o 2 The concentration is 3.5mol / L, the leaching temperature is 60°C, the leaching time is 3h, the liquid-solid ratio is 8:1, and the tungsten leaching rate is 99.2%. After filtering and washing, the filter cake is washed three times with pure water to obtain the leaching residue. The filtrate was passed through SO at 40°C 2 Gas, the precipitation rate of tungsten is 99.1%. The mother liquor is supplemented with consumed sulfuric acid and hydrogen peroxide to return to leaching.

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Abstract

The invention discloses a method for extracting tungsten through scheelite decomposing. The method mainly comprises the following steps that a sulfuric acid-hydrogen peroxide mixed solution is prepared, after the temperature is increased to the temperature required by a reaction, scheelite is added into a reactor to be decomposed, after the reaction is finished, the tungsten is extracted from obtained filtrate, and after hydrogen peroxide and sulfuric acid are supplemented, the leaching step is conducted. The method has the advantages that efficient normal-pressure leaching of the scheelite isachieved, no impurity is brought into the leaching process, energy sources are saved, follow-up impurity removal burden is lowered, and the tungsten leaching rate reaches 98% or above; hydrochloric acid volatilization and corrosion in the traditional acid decomposing process are avoided; influence of tungstic acid generation on the leaching process is overcome; the leaching agent can be recycled,the leaching cost is greatly reduced, and waste water emission is decreased; the leaching process is easy to operate, and industrialization is easy to achieve; and the obtained leached residues are gypsum good in filtering performance.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy and relates to a new method for decomposing scheelite to extract tungsten. technical background [0002] my country is the world's largest tungsten-producing country, ranking first in the world in terms of tungsten reserves, product output, export volume and consumption, and holds the dominance of the world's tungsten market. Although my country is rich in tungsten resources, it has long relied on high-quality black tungsten resources that are easy to smelt and smelt, resulting in a small amount of reserves. At present, scheelite has an absolute advantage. [0003] At present, the main methods of decomposing scheelite in industry are NaOH decomposition method and NaOH decomposition method. 2 CO 3 Pressure cooking method, but due to kinetic and thermodynamic reasons, the decomposition process needs to be carried out under the conditions of high temperature, high pressure and high alkali dosag...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B34/36
CPCC22B3/08C22B34/36Y02P10/20
Inventor 张文娟王成彦马保中
Owner UNIV OF SCI & TECH BEIJING
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