A method for extracting tungsten by decomposing wolframite or black and white tungsten mixed ore under pressure with sulfur-phosphorus mixed acid

A technology of sulfur-phosphorus mixed acid and wolframite, which is applied in the direction of improving process efficiency, can solve problems such as inability to be directly decomposed, and achieve the effects of reducing decomposition costs, simplifying production procedures, and reducing production costs

Active Publication Date: 2020-03-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when decomposing minerals containing black tungsten, there is a problem that it cannot be directly decomposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment relates to a method for extracting tungsten from wolframite, comprising the following steps:

[0034] 1) The particle size is 50μm, WO 3 Wolframite powder with a grade of 65% is added to the mixed acid solution of phosphoric acid and sulfuric acid at a mass volume ratio of 1:6. The concentration of phosphoric acid in the mixed acid solution is 180g / L, and the concentration of sulfuric acid is 250g / L. After the reaction system is stirred evenly, pressurize the system to 2.2 MPa, maintain the temperature of the reaction system at 220°C, stop the pressurization after 5.0 hours of reaction, and lower the reaction system to room temperature;

[0035] 2) Filter the reacted system to obtain the filtrate, use 25% TBP+10% sec-octanol+kerosene as the organic phase to extract the filtrate at 40°C for 10 minutes, extract the tungsten in the filtrate, and the remaining solution after extraction Return to step 1) after replenishing the consumed phosphoric acid and su...

Embodiment 2

[0037] This embodiment relates to a method for extracting tungsten from wolframite, comprising the following steps:

[0038] 1) The particle size is 150μm, WO 3 Wolframite powder with a grade of 35% is added to the mixed acid solution of phosphoric acid and sulfuric acid at a mass volume ratio of 1:4. The concentration of phosphoric acid in the mixed acid solution is 140g / L, and the concentration of sulfuric acid is 200g / L. After the reaction system is stirred evenly, pressurize the system to 1.25 MPa, maintain the temperature of the reaction system at 180°C, stop the pressurization after 6.0 hours of reaction, and lower the reaction system to room temperature;

[0039] 2) Filter the reacted system to obtain the filtrate, use 25% TBP+10% sec-octanol+kerosene as the organic phase to extract the filtrate at 40°C for 10 minutes, extract the tungsten in the filtrate, and the remaining solution after extraction Return to step 1) after replenishing the consumed phosphoric acid and ...

Embodiment 3

[0041] This embodiment relates to a method for extracting tungsten from wolframite, comprising the following steps:

[0042] 1) The particle size is 100μm, WO 3 Wolframite powder with a grade of 45% is added to the mixed acid solution of phosphoric acid and sulfuric acid at a mass volume ratio of 1:10. The concentration of phosphoric acid in the mixed acid solution is 160g / L, and the concentration of sulfuric acid is 220g / L. After the reaction system is stirred evenly, pressurize the system to 1.85 MPa, maintain the temperature of the reaction system at 200°C, stop the pressurization after 4.0 hours of reaction, and lower the reaction system to room temperature;

[0043]2) Filter the reacted system to obtain the filtrate, use 40% sec-octanol + kerosene as the organic phase to extract the filtrate for 10 minutes at 40°C, extract the tungsten in the filtrate, and add the remaining solution after extraction to the consumed Phosphoric acid and sulfuric acid are returned to step 1...

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Abstract

The invention relates to a method for extracting wolfram through pressurizing and decomposing of wolframite or scheelite and wolframite mixed ore by sulfuric and phosphoric mixed acid. Main improved points of the method lie in that in the process of extracting wolfram from the wolframite or the scheelite and wolframite mixed ore through a phosphoric acid and sulfuric acid mixture, a reaction system is subjected to pressurizing treatment, so that the temperature is 110-250 DEG C. Through pressurizing, the wolfram in the wolframite or the scheelite and wolframite mixed ore can be directly extracted without adding of calciferous compounds to convert the wolframite during wolfram extracting, the production procedure is simplified, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the extraction of metal tungsten in the field of hydrometallurgy, and in particular relates to a method for decomposing wolframite or black and white tungsten mixed ore by pressing. Background technique [0002] China's tungsten resource reserves rank first in the world, among which scheelite accounts for more than 2 / 3 of the tungsten resource reserves. Chinese invention patents 201010605095.1, 201010605107.0, 201010605103.2, 201010605110.2, 201010605094.7 propose a new method of synergistically decomposing tungsten ore using sulfuric acid-phosphoric acid. Realized the decomposition of scheelite, and provided a new smelting process for scheelite. [0003] However, when sulfuric acid-phosphoric acid synergistic decomposition technology is used to directly leach wolframite and black and white tungsten mixed ore, which account for 1 / 3 of my country's tungsten resource reserves, the leaching rate of tungsten is difficult to achieve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B3/06C22B34/36
CPCC22B3/06C22B3/08C22B34/36Y02P10/20
Inventor 赵中伟陈星宇任慧川
Owner CENT SOUTH UNIV
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