Method for efficiently removing phosphorus, arsenic and silicon impurities, extracting tungsten and recovering alkali from crude sodium tungstate solution

A technology of sodium tungstate and sodium polytungstate, which is applied in chemical instruments and methods, tungsten compounds, alkali metal compounds, etc., can solve the problems that tungsten cannot be extracted and purified at the same time, and achieve complete recovery and reuse, thorough recovery, The effect of efficient impurity removal

Active Publication Date: 2019-11-15
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of these traditional methods can realize the extraction and purification of tungsten at the same time, and at the same time realize the recovery of alkali

Method used

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  • Method for efficiently removing phosphorus, arsenic and silicon impurities, extracting tungsten and recovering alkali from crude sodium tungstate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Divide the crude sodium tungstate solution obtained after decomposing tungsten ore into two parts, and add calcium to one part to form calcium tungstate, wherein the amount of calcium added is the phosphorus, arsenic, silicon 1.2 times the total molar weight, and then mixed with another crude sodium tungstate solution for reaction, the reaction temperature is controlled at 85°C, and the reaction time is 3 hours, so that the phosphorous ions, arsenic ions, and silicon ions in the crude sodium tungstate solution Calcium salt precipitates are formed, and then filtered to obtain sodium tungstate solution;

[0025] (2) Pass carbon dioxide gas into the sodium tungstate solution obtained in step (1) to react, control the carbon dioxide pressure to be 5MPa, the reaction temperature is 50°C, the reaction time is 2 hours, and the pH of the solution is reduced to 4.5, so that the solution Tungsten exists in the form of polymerized ions, that is, isopolytungstate sodium solutio...

Embodiment 2

[0030] (1) Add artificial calcium tungstate to the crude sodium tungstate solution, the amount of artificial calcium tungstate added is 1.2 times the total molar amount of phosphorus, arsenic and silicon in the crude sodium tungstate solution, control the reaction temperature to 140°C, and the reaction time For 1 hour, phosphorus ions, arsenic ions, and silicon ions in the crude sodium tungstate solution all form calcium salt precipitates, and then filter to obtain sodium tungstate solution and calcium salt precipitates;

[0031] (2) Pass carbon dioxide gas into the sodium tungstate solution obtained in step (1) to react, control the carbon dioxide pressure to be 10MPa, the reaction temperature is 70°C, the reaction time is 0.5 hours, and the pH of the solution is reduced to 3, so that the solution Tungsten exists in the form of polymerized ions, that is, isopolytungstate sodium solution is obtained;

[0032] (3) The polytungstate sodium solution obtained in step (2) is then a...

Embodiment 3

[0036] (1) Add artificial calcium tungstate to the crude sodium tungstate solution, the amount of artificial calcium tungstate added is 1.5 times the total molar amount of phosphorus, arsenic and silicon in the crude sodium tungstate solution, control the reaction temperature to 30°C, and the reaction time For 6 hours, phosphorus ions, arsenic ions, and silicon ions in the crude sodium tungstate solution all form calcium salt precipitates, and then filter to obtain sodium tungstate solution and calcium salt precipitates;

[0037] (2) Control the pressure of carbon dioxide to be 0.2MPa, under the condition that the reaction temperature is 25°C, pass carbon dioxide gas into the sodium tungstate solution obtained in step (1) until the pH of the solution is 6, and the reaction time is 4 hours. In the carbon dioxide process, the sodium tungstate solution undergoes a decomposition reaction, so that the tungsten in the solution exists in the form of polymerized ions, that is, the isop...

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Abstract

The invention discloses a method for efficiently removing phosphorus, arsenic and silicon impurities, extracting tungsten and recovering alkali from a crude sodium tungstate solution. The method includes the following steps of mixing calcium tungstate with the crude sodium tungstate solution for reaction, conducting filtering to obtain a sodium tungstate solution, introducing carbon dioxide into the sodium tungstate solution until the pH of the solution is 3.0-6.5 to obtain a sodium polytungstate solution, conducting adsorbing through weak-base anion-exchange resin or extracting through a weakly alkaline extractant on tungsten in the sodium polytungstate solution to obtain a raffinate or exchanged liquid as a sodium bicarbonate solution, heating the obtained sodium bicarbonate solution toobtain a sodium carbonate solution and carbon dioxide, returning the sodium carbonate solution for decomposing tungsten ore to prepare the crude sodium tungstate solution and returning carbon dioxidefor decomposing sodium tungstate solution. By means of the method, the phosphorus, arsenic and silicon impurities in the crude sodium tungstate solution can be effectively removed, the tungsten can beeffectively extracted, and the alkali can be effectively recycled.

Description

technical field [0001] The invention relates to the technical field of resource recovery and utilization, and more specifically relates to a method for efficiently removing phosphorus, arsenic and silicon impurities, extracting tungsten and recovering alkali from crude sodium tungstate solution. Background technique [0002] Alkali (sodium hydroxide or soda) pressure cooking can effectively decompose various tungsten ores, so it is widely used in tungsten smelting enterprises in my country. However, in order to achieve efficient decomposition of tungsten ore, the amount of alkali must be greatly excessive. The excess of scheelite treated with NaOH is 2 to 4 times, while Na 2 CO 3 The excess coefficient of decomposition of tungsten ore is 2 to 3 times. These unconsumed bases enter the crude sodium tungstate solution. After extracting tungsten from the crude sodium tungstate solution according to the traditional process, the unconsumed alkali is discharged into the waste w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00C01D7/00C01B32/50
CPCC01B32/50C01D7/00C01G41/00
Inventor 陈星宇赵中伟刘旭恒
Owner CENT SOUTH UNIV
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