A method for decomposing high-tin tungsten ore under pressure with sulfur-phosphorus mixed acid

A technology of sulfur-phosphorus mixed acid and phosphoric acid, which is applied in the field of hydrometallurgy, can solve problems such as inability to be directly decomposed, and achieve the effects of low decomposition cost, reduced production cost, and accelerated reaction speed

Active Publication Date: 2020-11-10
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

[0035] This embodiment relates to a method for extracting tungsten from tin-rich wolframite, comprising the following steps:

[0036] 1) The particle size is 100μm, WO 3 The grade of tungsten is 62%, the grade of tin is 1.2%, the mixed acid of wolframite powder and phosphoric acid and sulfuric acid is mixed at a mass volume ratio of 1:5, the concentration of phosphoric acid in the mixed acid solution is 175g / L, and the concentration of sulfuric acid is 240g / L, stir the reaction system evenly, pressurize the system to 2.6MPa, maintain the temperature of the reaction system at 230°C, stop the pressurization after 4.0h of reaction, and lower the reaction system to room temperature;

[0037] 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) and reuse after the phosphoric aci...

Embodiment 2

[0039] This embodiment relates to a method for extracting tungsten from tin-rich wolframite, comprising the following steps:

[0040] 1) The particle size is 150μm, WO 3 The grade of tungsten is 50%, the grade of tin is 3.2%, the mixed acid of wolframite powder and phosphoric acid and sulfuric acid is mixed at a mass system ratio of 1:6, the concentration of phosphoric acid in the mixed acid solution is 160g / L, and the concentration of sulfuric acid is 220g / L, stir the reaction system evenly, pressurize the system to 2.2MPa, maintain the temperature of the reaction system at 220°C, stop the pressurization after 4.0h of reaction, and lower the reaction system to room temperature;

[0041] 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 ...

Embodiment 3

[0043] This embodiment relates to a method for extracting tungsten from tin-rich wolframite, comprising the following steps:

[0044] 1) The particle size is 60μm, WO 3 The grade of tungsten is 34%, the grade of tin is 16.5%, the mixed acid of wolframite powder and phosphoric acid and sulfuric acid is mixed at a mass system ratio of 1:8, the concentration of phosphoric acid in the mixed acid solution is 120g / L, and the concentration of sulfuric acid is 180g / L, stir the reaction system evenly, pressurize the system to 1.85MPa, maintain the temperature of the reaction system at 200°C, stop the pressurization after 6.0h of reaction, and lower the reaction system to room temperature;

[0045] 2) Filter the reacted system to obtain the filtrate, use 30% N235+kerosene as the organic phase to extract the filtrate at 50°C for 10 minutes, extract the tungsten in the filtrate, and add the remaining solution after extraction to the consumed phosphoric acid and sulfuric acid Then return ...

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Abstract

The invention relates to a method for pressurizing decomposing a high-tin tungsten ore with mixed acid of phosphoric acid and sulfuric acid. According to the method, the improvements comprise the following that a reaction system is pressurized and the temperature of the reaction system is 110-250 DEG C in the process of extracting tungsten from a high-tin wolframite ore or high-tin black and whitetungsten mixed ore with the mixed acid of phosphoric acid and sulfuric acid, and tin concentrate can be obtained directly or through the ore dressing process from decomposed slag with the tungsten being already extracted. According to the method, by pressurizing, calcium-containing compounds do not need to be added to conduct conversion on the wolframite in the extracting process of the tungsten,the tungsten can be directly extracted from wolframite or the black and white tungsten mixed ore, meanwhile, the tin concentrate is obtained, so that the production process 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 high-tin tungsten ore through pressurization. Background technique [0002] In my country, tin-containing tungsten ore is an important tungsten ore resource, and it also contains high-value tin. Generally, tin is associated with wolframite or black and white tungsten mixed ore in the form of cassiterite. Traditional ore dressing and tungsten smelting methods cannot efficiently separate and recover the tin in it. Chinese invention patents 201010605095.1, 201010605107.0, 201010605103.2, 201010605110.2, and 201010605094.7 proposed a new method of using sulfuric acid-phosphoric acid to decompose tungsten ore, which efficiently realized the decomposition of scheelite and provided a new smelting process for scheelite. However, when the sulfuric acid-phosphoric acid synergistic decomposition technology is used to d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/36C22B3/06C22B25/00
CPCC22B3/06C22B25/04C22B34/36Y02P10/20
Inventor 陈星宇赵中伟任慧川
Owner CENT SOUTH UNIV
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