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A method for decomposing scheelite under pressure with phosphorus-sulfur mixed acid

A technology of scheelite and sulfuric acid, which is applied in the extraction of metal tungsten, decomposes scheelite under pressure, can solve the problems of acid waste and increase the cost of tungsten ore decomposition, achieve high decomposition rate, reduce extraction cost, and reduce additives volume effect

Active Publication Date: 2020-07-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will lead to a lot of waste of acid, especially phosphoric acid, which will increase the cost of tungsten ore decomposition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment relates to a method for extracting tungsten from scheelite, comprising the following steps:

[0030] 1) The particle size is 50μm, WO 3 The grade of 65% scheelite powder is mixed with 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 80g / L, and the concentration of sulfuric acid is 140g / L. The reaction system After stirring evenly, pressurize the system to 1.85MPa, maintain the temperature of the reaction system at 200°C, stop the pressurization after 2 hours of reaction, and lower the reaction system to room temperature;

[0031] 2) Filter the reacted system to obtain the filtrate, use 30% 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 After replenishing the consumed phosphoric acid and sulfuric acid, return to...

Embodiment 2

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

[0034] 1) The particle size is 300μm, WO 3 The grade of 15% scheelite powder is mixed with 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 40g / L, and the concentration of sulfuric acid is 100g / L. The reaction system After stirring evenly, pressurize the system to 0.75MPa, maintain the temperature of the reaction system at 160°C, stop the pressurization after 4 hours of reaction, and lower the reaction system to room temperature;

[0035] 2) Filter the reacted system to obtain a filtrate, use 50% 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) for repe...

Embodiment 3

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

[0038] 1) The particle size is 100μm, WO 3 The grade of 42% scheelite powder is mixed with 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 60g / L, and the concentration of sulfuric acid is 80g / L. The reaction system After stirring evenly, pressurize the system to 1.25MPa, maintain the temperature of the reaction system at 180°C, stop the pressurization after 3.5 hours of reaction, and lower the reaction system to room temperature;

[0039] 2) Filter the reacted system to obtain a filtrate, use 40% N235+kerosene as the organic phase to extract the filtrate for 10 minutes at 50°C, extract the tungsten in the filtrate, and add the remaining solution after extraction to the consumed phosphoric acid and Return to step 1) after the sulfuric acid and reuse; Af...

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Abstract

The invention relates to a method for decomposing scheelite through pressurizing by adopting phosphorus-sulfur mixed acid. According to the main improved point, in the process of extracting the tungsten from the scheelite by using the mixed acid of phosphoric acid and sulfuric acid, pressurization treatment is carried out on a reaction system, so that the temperature of the reaction system is higher than 100 DEG C. According to the method, pressurized high-temperature treatment is carried out on the reaction system of extracting the tungsten from the scheelite by the phosphoric acid and the sulfuric acid, under the condition that the extraction rate of the tungsten is guaranteed, the addition amount of the phosphoric acid and the sulfuric acid is reduced, and the addition of calcium sulfate crystal seeds is omitted; and compared with an existing non-pressurization method, the method still has the advantages of being high in decomposition rate, free of generation of hazardous waste decomposition slag and low in decomposition cost.

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 scheelite by pressure. 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 proposed a new method of using sulfuric acid-phosphoric acid to decompose tungsten ore synergistically. The decomposition of scheelite is realized, and a new smelting process is provided for scheelite. Sulfur-phosphorus mixed acid has several advantages when treating scheelite: first, tungsten ore has a high decomposition rate; second, it does not produce hazardous waste decomposition residue; third, it uses cheap sulfuric acid for decomposition, and the decomposition cost is low; Decomposition only needs to be a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/36C22B3/06
CPCC22B3/06C22B34/36Y02P10/20
Inventor 赵中伟陈星宇李江涛刘旭恒何利华
Owner CENT SOUTH UNIV
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