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A kind of scheelite decomposing agent and method for extracting tungsten from scheelite

A scheelite and decomposer technology, applied in the direction of improving process efficiency, can solve the problems of high energy consumption, low tungsten leaching rate and high cost, and achieve the effect of low energy consumption, low cost and inhibiting hydrolysis

Active Publication Date: 2021-01-15
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low leaching rate of tungsten, high energy consumption and high cost in extracting tungsten from high-barium scheelite in the prior art, thereby providing a tungsten leaching rate high A scheelite decomposing agent with low energy consumption and low cost and its application in extracting tungsten from scheelite
[0005] Another technical problem to be solved by the present invention is to overcome the defects of low leaching rate of tungsten, high energy consumption, and high cost in extracting tungsten from high-barium scheelite in the prior art, thereby providing a tungsten leaching rate high A method for extracting tungsten from scheelite with low energy consumption and low cost

Method used

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  • A kind of scheelite decomposing agent and method for extracting tungsten from scheelite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The high-barium scheelite used in this example was tested for its initial WO according to the standards GB / T 14352.1-2010 and GB / T 6730 respectively. 3 and Ba content, the test result is WO 3 31.2%, Ba 2.56%.

[0035] This embodiment provides a scheelite decomposer, which includes sodium nitrate, sodium hydroxide and sodium carbonate, and the mass ratio of sodium nitrate, sodium hydroxide and sodium carbonate is 1:4:40.

[0036] This implementation also provides a method for extracting tungsten from scheelite, comprising,

[0037] S1. Prepare the above scheelite decomposing agent into an aqueous solution with a mass fraction of 15wt%, weigh 100g of scheelite, add it to the autoclave, and add 300mL (liquid-solid ratio: 3:1) decomposing agent aqueous solution to it to prepare into slurry.

[0038] S2. Decompose the slurry obtained in S1 under the conditions of stirring, pressurizing and heating. The stirring speed is 60r / min, the pressure is 1.6MPa, the temperature is...

Embodiment 2

[0042] The high-barium scheelite used in this example was tested for its initial WO according to the standards GB / T 14352.1-2010 and GB / T 6730 respectively. 3 and Ba content, the test result is WO 3 29.35%, Ba 1.67%.

[0043] This embodiment provides a scheelite decomposing agent, which includes sodium nitrate, sodium hydroxide and sodium carbonate, and the mass ratio of sodium nitrate, sodium hydroxide and sodium carbonate is 1:3:30.

[0044] This implementation also provides a method for extracting tungsten from scheelite, comprising,

[0045] S1, the above scheelite decomposer is formulated into an aqueous solution with a mass fraction of 20wt%, weighs 100g of scheelite, puts it into an autoclave, and adds 450mL (liquid-solid ratio: 4.5:1) decomposer aqueous solution to it to prepare into slurry.

[0046] S2. Decompose the slurry obtained in S1 under the conditions of stirring, pressurizing and heating. The stirring speed is 90r / min, the pressure is 1.9MPa, the temperat...

Embodiment 3

[0050] The high-barium scheelite used in this example was tested for its initial WO according to the standards GB / T 14352.1-2010 and GB / T 6730 respectively. 3 and Ba content, the test result is WO 3 25.6%, Ba 2.83%.

[0051] This embodiment provides a scheelite decomposing agent, which includes sodium nitrate, sodium hydroxide and sodium carbonate, and the mass ratio of sodium nitrate, sodium hydroxide and sodium carbonate is 1:3.5:35.

[0052] This implementation also provides a method for extracting tungsten from scheelite, comprising,

[0053] S1. Prepare the above scheelite decomposing agent into an aqueous solution with a mass fraction of 10wt%, weigh 200 g of scheelite, add it to an autoclave, and add 1200 mL (liquid-solid ratio: 6:1) of decomposing agent aqueous solution to it to prepare into slurry.

[0054] S2. Decompose the slurry obtained in S1 under the conditions of stirring, pressurizing and heating. The stirring speed is 120r / min, the pressure is 2.2MPa, the...

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Abstract

The invention provides a scheelite decomposing agent. The scheelite decomposing agent comprises sodium nitrate, sodium hydroxide and sodium carbonate. The invention further provides a method for extracting the tungsten from the scheelite. The method comprises the following steps of S1, mixing the scheelite with the scheelite decomposing agent to prepare a thick liquid; S2, carrying out decomposition reaction on the scheelite and the scheelite decomposing agent to obtain a decomposed thick liquid; S3, filtering and separating the decomposed thick liquid to obtain a tungsten decomposition liquidand decomposition slag. According to the scheelite decomposing agent and the method, a mixture of sodium nitrate, sodium hydroxide and sodium carbonate is adopted as a decomposing agent, the decomposing agent and the scheelite are subjected to decomposition reaction, the three components cooperate with each other to achieve a synergistic effect, the high-barium scheelite can be well decomposed, the decomposition rate is high, the leaching rate of the tungsten is high, the energy consumption is low, and the cost is low.

Description

technical field [0001] The invention relates to the field of rare metal utilization, in particular to a scheelite decomposer and a method for extracting tungsten from scheelite. Background technique [0002] The main smelting raw materials of tungsten are wolframite and scheelite, but with the mining of tungsten resources year by year, the grades of tungsten resources are reduced, the components are complicated, and they are associated with other metals, which increases the cost of beneficiation and smelting of tungsten resources . At present, the common method for treating tungsten ore is high-pressure alkaline leaching. This process can decompose tungsten ore under the conditions of high alkali, high temperature and high pressure. However, for scheelite with high barium content, due to the tungsten And barium exists in the form of very stable barium tungstate, which is very difficult to decompose, and the higher the content of barium, the greater the impact on decompositi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/12C22B34/36
CPCC22B3/12C22B34/36Y02P10/20
Inventor 黄万抚曾斌曾祥荣李新冬黄李金鸿胡运祯张天锡
Owner JIANGXI UNIV OF SCI & TECH
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