Method for directly producing tungsten oxide powder by adopting sodium tungstate solution

A technology of tungsten oxide powder and sodium tungstate, applied in the direction of tungsten oxide/tungsten hydroxide, improvement of process efficiency, etc., can solve the problems of high equipment requirements, long production process, environmental pollution, etc., and achieve simple production equipment and production cost. Low, safe and controllable effect of operation

Pending Publication Date: 2022-08-02
云南锡业集团(控股)有限责任公司研发中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The hydrometallurgy process has a long production process and a large amount of waste water, which not only pollutes the environment, but also requires high equipment

Method used

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  • Method for directly producing tungsten oxide powder by adopting sodium tungstate solution
  • Method for directly producing tungsten oxide powder by adopting sodium tungstate solution

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Effect test

Embodiment 1

[0036] The method for directly producing tungsten oxide powder by using sodium tungstate solution, the steps are as follows:

[0037] (1) the sodium tungstate solution of tungsten ore alkali leaching separation output reaches saturation through de-impurity;

[0038] (2) Take 1 L of saturated sodium tungstate solution, add 500 g of calcium acetate under stirring, and stir for 30 min to generate calcium tungstate precipitation; wash calcium tungstate to remove soluble impurities such as Na, K, Ca, and Mg;

[0039] (3) adding 750 g of ammonium acetate to 1 L of pure water, stirring and dissolving, and controlling the temperature to be less than 45°C to prepare a tungsten-dissolving reagent;

[0040] (4) adding the washed calcium tungstate into the tungsten-dissolving reagent under stirring, stirring continuously for 1 h until the calcium tungstate is dissolved, filtering the insoluble impurities to obtain a tungsten solution;

[0041] (5) adding ammonium oxalate 250g precipitati...

Embodiment 2

[0046] The method for directly producing tungsten oxide powder by using sodium tungstate solution, the steps are as follows:

[0047] (1) the sodium tungstate solution of tungsten ore alkali leaching separation output reaches saturation through de-impurity;

[0048] (2) Add 100 L of saturated sodium tungstate solution, add 50 kg of calcium chloride in a state of stirring, and stir for 1 h to form calcium tungstate precipitation. The reaction formula is as follows:

[0049] Na 2 WO 4 +2CaCl 2 →CaWO 4 ↓

[0050] Wash calcium tungstate to remove Na, K, Ca, Mg and other soluble impurities;

[0051] (3) Preparation of tungsten-dissolving reagent: 100L pure water, add 70kg of ammonium formate, stir and dissolve, and control the temperature to be less than 45°C;

[0052] (4) adding the washed calcium tungstate into the tungsten-dissolving reagent to dissolve under stirring, stirring continuously for 1 h, filtering to remove insoluble impurities, and obtaining a tungsten soluti...

Embodiment 3

[0061] The method for directly producing tungsten oxide powder by using sodium tungstate solution, the steps are as follows:

[0062] (1) the sodium tungstate solution of tungsten ore alkali leaching separation output reaches saturation through de-impurity;

[0063] (2) Set the volume to 2m 3 The saturated sodium tungstate solution, for example, add 0.8t of calcium nitrate in stirring state, and stir for 1.5h to form calcium tungstate precipitation. Calcium tungstate washing to remove Na, K, Ca, Mg and other soluble impurities;

[0064] (3) Preparation of tungsten-dissolving reagent: 2 m 3 Add 0.5t of ammonium tartrate and 0.5t of ammonium propionate to pure water, stir and dissolve, and control the temperature to be less than 45℃;

[0065] (4) adding calcium tungstate into the tungsten-dissolving solvent under stirring, continuously stirring for 2h, filtering to remove insoluble impurities, and obtaining a tungsten solution;

[0066] (5) add ammonium sulfate 650kg precipi...

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Abstract

The invention relates to a method for directly producing tungsten oxide powder by adopting a sodium tungstate solution, which comprises the following steps: by taking the sodium tungstate solution separated by tungsten ore hydrometallurgy as a raw material, adding a tungsten precipitation reagent into the sodium tungstate solution while stirring to generate calcium tungstate precipitate, and washing to remove impurities; the method comprises the following steps: preparing a tungsten dissolving reagent, adding calcium tungstate into the tungsten dissolving reagent, stirring and dissolving, precipitating to remove impurities to obtain a tungsten solution, adding a calcium precipitating agent into the tungsten solution, stirring and standing to precipitate calcium, adjusting the pH value of the solution to 5-8, and filtering to remove calcium; the decalcified filtrate is transferred to a hydrothermal kettle for a hydrothermal reaction, and tungsten oxide slurry is obtained; filtering, washing and drying the tungsten oxide slurry to prepare tungsten oxide; and reducing the tungsten oxide through hydrogen to prepare tungsten oxide powder. The separation of tungsten and impurities is realized by utilizing the dissolution characteristic of the tungsten compound after form transformation. According to the method, ammonia water and an ion adsorption or extraction impurity removal device are not needed, the process is simple, the flow is short, less wastewater is generated, environmental pollution is small, and operation is safe and controllable.

Description

technical field [0001] The invention relates to the technical field of tungsten oxide preparation, in particular to a method for directly preparing tungsten oxide powder by using sodium tungstate solution. Background technique [0002] Tungsten is a rare metal with high melting point and has the reputation of "Fire King Kong". With its high melting point, high specific gravity and high hardness, tungsten is widely used in machining, metallurgy, mining industry, electronics and telecommunications, construction industry, weapon industry, aerospace and aviation. and other fields. [0003] Metal tungsten is generally prepared by calcination of ammonium paratungstate (APT) to prepare tungsten oxide, tungsten oxide is reduced with hydrogen to obtain tungsten powder, and tungsten powder is processed into tungsten and tungsten carbide tungsten plates, bars, wires, balls and other products by powder metallurgy. In order to obtain metal tungsten products with a certain purity, the pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02
CPCC01G41/02Y02P10/20
Inventor 普友福符泽卫鲍瑞覃德清易健宏李俊马殿普张双银刘嘉宸
Owner 云南锡业集团(控股)有限责任公司研发中心
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