Synthesis of high purity tungsten hexafluoride using metal tungsten as anodic electrolytic molten salt

A technology of tungsten hexafluoride and anode electrolysis, which is applied in the electrolysis process, electrolysis components, cells, etc., can solve the problems of cumbersomeness, improving the purity of tungsten hexafluoride, and expensive production cost.

CN109652816AActive Publication Date: 2019-04-19广东金光高科股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-04-19

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Abstract

A metal tungsten plate is preferably used as an anode of an electrolytic bath, a raw material lithium fluoride beryllium eutectic is preferably used as an electrolyte, the melting point range is suitable for electrolysis and does not contain hydrogen fluoride components, and the pollution of harmful components such as carbon tetrafluoride, hydrogen fluoride and the like to the finished product tungsten hexafluoride can be cut off from the source. Tungsten hexafluoride gas generated in an electrolytic bath, entrained molten salt dust and a small amount of fluorine gas which is not reacted withmetal tungsten enter a gas purification tank along a gas outlet pipe of the electrolytic bath, and electrolyte dust entrained by the tungsten hexafluoride is removed by a dust filter plate and a dustadsorbent; a tungsten microsphere reaction layer is used for completely converting a small amount of unreacted fluorine gas into tungsten hexafluoride, and a microporous filter is used for completelyfiltering entrained tungsten particles to finally generate high-purity tungsten hexafluoride gas. The method achieves direct synthesis of the high-purity tungsten hexafluoride by an electrolytic method, and has the advantages of simple process route, less finished product impurities, high yield, extremely competitive comprehensive production cost and the like.
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Description

technical field

[0001] The invention relates to a device and a process for directly synthesizing high-purity tungsten hexafluoride by electrolyzing molten salt. Background technique

[0002] Tungsten hexafluoride (WF 6 ) is the only stable and industrially produced variety of tungsten fluorides so far. There are many important uses; for example, the tungsten / rhenium composite coating is prepared by the CVD process of mixed metals, which can be used in the manufacture of solar energy absorbing materials and X-ray emitting electrodes; making tungsten generate hard tungsten carbide on the surface of steel, copper or other metals It can be used to improve the surface properties of metals and to manufacture various special-shaped tungsten parts such as tungsten tubes, tungsten nozzles and tungsten crucibles. WF 6 In the electronics industry, it is also widely used as a raw material for semiconductor electrodes and conductive pastes, especially tungsten disilicide (WSi) made of...

Examples

Embodiment

[0058] Metal tungsten is used as an anode to electrolyze molten salt to synthesize high-purity tungsten hexafluoride, including the following steps:

[0059] Select the DYD-100-0.5 type beryllium electrolytic cell as the core equipment prototype (basic parameters: electrolytic cell volume 0.8M 3 , the power of the intermediate frequency heating device is 100Kw, the overall material of the electrolytic tank is 3010 heat-resistant stainless steel, the thickness of the tank cover is 30mm, the thickness of the tank body is 18mm, the thickness of the light refractory brick insulation layer outside the tank is 200mm, the normal working temperature of the electrolytic tank: the highest resistance in a short period of time Heat 800°C, long-term work within 600°C, electrolytic cell cathode nickel plate size: 400*300*6*9, electrolytic cell anode tungsten plate size: 400*300*20*8,).

[0060] According to the requirements of the tooling, clean, degrease, assemble the cathode, anode, assem...