Method of treating scheelite

A technology of scheelite and tungsten trioxide, applied in the field of scheelite treatment, can solve the problems of high decomposition cost, large consumption of sodium carbonate, difficult recovery of sodium carbonate, etc., and achieve the effect of reducing waste water discharge and consumption.

Active Publication Date: 2019-09-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because sodium carbonate is not easy to recycle, it leads to higher decomposition costs
Therefore, need to solve the big problem of sodium carbonate consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The scheelite in this embodiment contains WO 3 43.7%, P8.3%, Si2.4%.

[0032] The present embodiment proposes a method for processing scheelite, comprising the following steps:

[0033] 1) Mix scheelite with sodium carbonate solution and carry out pressure cooking reaction, then evaporate and concentrate until the concentration of tungsten trioxide in the solution is 600g / L, then control the temperature at 250°C for 5 hours, and then filter to obtain a solid precipitate and solution. Return the filtered solution to carry out the pressure cooking reaction of scheelite. The solid precipitate is washed with water, and the resulting washing water is added to the filtered solution for recycling.

[0034] 2) Mix and react the solid precipitate and hydrogen peroxide at 20°C for 0.5 hour according to the molar ratio of the hydrogen peroxide to the tungsten in the solid precipitate is 3:1, and filter to obtain a calcium peroxytungstate solution. The obtained calcium peroxytu...

Embodiment 2

[0037] The scheelite in this embodiment contains WO 3 44.8%, P9.3%, Si4.2%.

[0038] The present embodiment proposes a method for processing scheelite, comprising the following steps:

[0039] 1) Mix scheelite and sodium carbonate solution and carry out the pressure cooking reaction to obtain a slurry obtained by filtering to obtain a crude sodium tungstate solution, and then evaporate and concentrate the crude sodium tungstate solution to a concentration of tungsten trioxide of 620g / L , and then the temperature was controlled at 230° C. for 2 hours, and then filtered to obtain a solid precipitate and a solution. Return the filtered solution to carry out the pressure cooking reaction of scheelite. The solid precipitate is washed with water, and the resulting washing water is added to the filtered solution for recycling.

[0040] 2) Mix and react the solid precipitate and hydrogen peroxide at 40°C for 3 hours according to the molar ratio of the hydrogen peroxide to the tungste...

Embodiment 3

[0043] The scheelite in this embodiment contains WO 3 46.2%, P7.1%, Si2.8%.

[0044] The present embodiment proposes a method for processing scheelite, comprising the following steps:

[0045] 1) Mix scheelite with sodium carbonate solution and carry out pressure cooking reaction, then evaporate and concentrate until the concentration of tungsten trioxide in the solution is 610g / L, then control the temperature at 240°C for 10 hours, and then filter to obtain a solid precipitate and solution. Return the filtered solution to carry out the pressure cooking reaction of scheelite. The solid precipitate is washed with water, and the resulting washing water is added to the filtered solution for recycling.

[0046] 2) Mix and react the solid precipitate and hydrogen peroxide at 60°C for 6 hours according to the molar ratio of the hydrogen peroxide to the tungsten in the solid precipitate of 4:1, and filter to obtain a calcium peroxytungstate solution. The obtained calcium peroxytu...

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Abstract

The present invention relates to a method of treating scheelite. The method comprises the following steps: 1) mixing the scheelite and a sodium carbonate solution, performing a pressure cooking reaction to obtain a crude sodium tungstate solution, performing evaporation concentration until a concentration of tungsten trioxide in the crude sodium tungstate solution is higher than 600 g / L, controlling the temperature at 200-250 DEG C, performing a reaction, and performing filtration to obtain a solid precipitate and solution; and 2) mixing the solid precipitate and hydrogen peroxide for a reaction, and performing filtration to obtain a calcium peroxo-tungstate solution; or, mixing the solid precipitate, hydrogen peroxide and an ammonium salt to obtain an ammonium peroxo-tungstate solution, wherein the ammonium salt is one or more selected from the group consisting of ammonium carbonate, ammonium oxalate, ammonium sulfate and ammonium phosphate. The method provided by the invention greatly reduces consumption of the sodium carbonate, directly converts the calcium tungstate into the calcium peroxo-tungstate by adopting the hydrogen peroxide without using an ion exchange process, and reduces discharge of wastewater.

Description

technical field [0001] The invention relates to the field of tungsten ore processing, in particular to a method for processing scheelite. Background technique [0002] At present, the mainstream treatment process of scheelite concentrate is pressure cooking with sodium hydroxide, and the leaching effect of tungsten is very good. However, with the continuous consumption of high-quality scheelite, complex and low-grade scheelite is gradually being utilized. If the sodium hydroxide pressure cooking method is used, the leaching of tungsten will be significantly reduced. The use of sodium carbonate pressure cooking can solve this problem well. However, there are also several problems in the treatment of tungsten ore by sodium carbonate pressure cooking: [0003] (1) When using sodium carbonate to cook scheelite, in order to realize the complete decomposition of scheelite, a large amount of sodium carbonate is used, and a large amount of unconsumed soda enters the sodium tungst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
CPCC01G41/00
Inventor 陈星宇赵中伟刘旭恒陈爱良李江涛何利华
Owner CENT SOUTH UNIV
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