Method for preparing tungsten from WO3

A metal tungsten and three-component technology, applied in the field of electrolysis and electrophoresis, can solve the problems of unstable deposition effect and large changes in molten salt composition, and achieve the effects of low cost, short production process and low consumption

Inactive Publication Date: 2011-07-20
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong corrosiveness of phosphate, its application is limited, and at 700 ° C, the brittle layer of β-tungsten is mainly deposited.
in Na 2 WO 4 -Li 2 WO 4 -WO 3 , Na 2 WO 4 -WO 3 、Na 2 WO 4 -ZnO-WO 3 、NaF-NaCl-WO 3 In the system, the tungsten deposition layer with smaller crystal grains is obtained by using the pulse electrodeposition method, thereby improving the quality of the deposition layer, but the electrodeposition temperature of these systems is very high, and as the electrodeposition progresses, the melting The salt composition changes greatly, resulting in unstable deposition effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] According to NaCl, KCl, Na 2 WO 4 The molar ratio is 2:2:0.01 to take the dissolved salt medium, according to WO 3 Accounting for 10% of the mass percentage of molten salt medium, weigh powdered WO with particle size ≥ 150 mesh 3 , Mix the above four substances evenly, put them into a crucible, put them into an electric furnace and raise the temperature to 650°C, and keep the temperature constant for 10 minutes. Put in the Cu electrode and feed it with a pulse current at a temperature of 650°C and an average current density of 200A / m 2 Under the conditions of pre-deposition for 20 minutes to remove impurities. Take out the Cu electrode, insert the W electrode, and feed it with a pulse current at a temperature of 650°C and an average current density of 300A / m 2 Under the condition of , pure W was obtained by electrodeposition for 3 hours. The X-ray energy spectrum and scanning electron microscope analysis of the deposited layer on the W electrode show that the depos...

Embodiment 2

[0017] According to NaCl, KCl, Na 2 WO 4 The molar ratio is 2:2:0.03 to take the dissolved salt medium, according to WO 3 Accounting for 15% of the mass percentage of the molten salt medium, weigh the powdered WO with a particle size ≥ 150 mesh 3 , Mix the above four substances evenly, put them into a crucible, put them into an electric furnace and raise the temperature to 700°C, and keep the temperature constant for 10 minutes. Put in the Cu electrode and feed it with a pulse current at a temperature of 700°C and an average current density of 250A / m 2 Under the conditions of pre-deposition for 20 minutes to remove impurities. Take out the Cu electrode, insert the W electrode, and feed it with a pulse current at a temperature of 700°C and an average current density of 450A / m 2 Under the conditions of , pure W was obtained by electrodeposition for 2 hours. The X-ray energy spectrum and scanning electron microscope analysis of the deposited layer on the W electrode show tha...

Embodiment 3

[0019] According to NaCl, KCl, Na 2 WO 4 The molar ratio is 2:2:0.05 to take the dissolved salt medium, according to WO 3 Accounting for 20% of the mass percentage of molten salt medium, weigh powdered WO with particle size ≥ 150 mesh 3 , Mix the above four substances evenly, put them into a crucible, put them into an electric furnace and raise the temperature to 750°C, and keep the temperature constant for 10 minutes. Put in the Cu electrode, feed it with pulse current at a temperature of 750°C, and the average current density is 300A / m 2 Under the conditions of pre-deposition for 20 minutes to remove impurities. Take out the Cu electrode, insert the W electrode, and feed it with a pulse current at a temperature of 750°C and an average current density of 600A / m 2Under the condition of , pure W was obtained by electrodeposition for 1 hour. The X-ray energy spectrum and scanning electron microscope analysis of the deposited layer on the W electrode show that the deposited ...

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Abstract

The invention relates to a method for preparing tungsten from WO3, belonging to the technical field of electrolysis and electrophoresis. The method is used for realizing one-step electrodeposition to obtain WO3 from with fused salt as medium under the action of pulse direct current. The method is characterized in that a component comprising NaCl, KCl and NaWO4 is used as medium, wherein the molar ratio of NaCl to KCl to NaWO4 is 2:2:(0.01-2):2:0.05, and the powdered WO3 which is 10-20 wt% of the fused salt medium is added; and after impurity removal by pre-electrolysis, pure tungsten is obtained by electrodeposition at an electrodeposition temperature of 650-750 DEG C, electrodeposition time of 1-3 hours and current density of 300-600 A / m2. The method provided by the invention has the following characteristics: (1) the component of the fused salt is common cheap agent, is easily-accessible and has low cost and less consumption; (2) the production technology has short process and wide parameter control range, and is easy to operate and implement; (3) the electrodeposition temperature is low, so that the fused salt does not volatilize; and (4) the component of the fused salt can be ensured to not to change with the prolongation of the electrodeposition time, so as to ensure the stability of electrodeposition process. The method has good prospect in tungsten production and applications.

Description

technical field [0001] The present invention relates to a kind of by WO 3 A method for preparing metal tungsten, especially a method for electrodepositing tungsten in a molten salt system, belongs to the technical field of electrolysis and electrophoresis. Background technique [0002] The content of tungsten in the earth's crust is small, accounting for only 0.007% of the weight of the earth's crust. Metallic tungsten has not been found in nature, and about 15 kinds of tungsten minerals have been discovered so far, among which wolframite and scheelite are the most important, and they are the main raw materials for tungsten metallurgy. Due to the special nature of metal tungsten, the extraction of metal tungsten from wolframite or scheelite cannot be obtained through high-temperature smelting process like extracting iron from iron ore or extracting copper from copper ore to obtain liquid metal with higher grade. The leaching-purification or extraction-roasting process has ...

Claims

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Application Information

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IPC IPC(8): C25C3/34
Inventor 李运刚李杰刘丽敏王艳春唐国章田薇
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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