Production method of oxygen-free high-purity cadmium powder

Abstract

The invention discloses a production method of oxygen-free high-purity cadmium powder, which comprises the following steps of putting a cadmium metal material into a sublimation furnace evaporation tank, sealing a feed port of the sublimation furnace evaporation tank, filling protective gas into a condenser, exhausting air in the evaporation tank, the condenser and a material collector, and continuously filling the protective gas in the subsequent production process; then starting the sublimation furnace evaporation tank, the condenser and an exhaust fan, heating the cadmium metal material to sublimate cadmium metal, and enabling a generated cadmium metal gas-liquid mixture to enter the condenser, cooled and solidified into powder and fall into the material collector. The production method is easy to operate, high in flexibility, high in production efficiency, free of pollution, less in energy waste, low in cost, high in equipment and raw material utilization rate, capable of automatically and continuously operating, less in needed manual operation after operation and good in operation safety, and the oxygen-free high-purity cadmium powder which is good in quality uniformity, high in purity and good in quality can be prepared.

Description

technical field [0001] The invention relates to a production method of oxygen-free high-purity cadmium powder, in particular to a production method of oxygen-free high-purity cadmium powder with a product purity as high as 99.99%. Background technique [0002] The existing high-purity cadmium powder production method adopts a vacuum sublimation furnace as the production equipment, and puts the raw material in a sublimation boat and puts it into the vacuum sublimation furnace. The sublimation boat is heated in the furnace under vacuum conditions to melt and evaporate the material. After overflowing, the massive material is melted and evaporated at high temperature, then cooled and solidified into fine powder, so as to realize solid phase separation. [0003] The existing high-purity cadmium powder production process not only needs to improve the purity of the prepared high-purity cadmium powder, but also requires complex equipment, and requires manual and careful operation, w...

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Problems solved by technology

[0003] The existing high-purity cadmium powder production process not only needs to improve the purity of the prepared high-purity cadmium powder, but also requires complex equipment, and requires manual and careful operation, which requires very high requirements for operators. It is easy to burn when it is easy to operate at high temperature. There is a lot of contact between personnel and materials when collecting materials, and the safety of personnel cannot be guaranteed. At the same time, it is difficult to collect materials. The graphite boat and furnace liner holding the raw materials of the product are stuck together from time to time, which is difficult to take out, inconvenient to clean, and difficult to operate. Moreover, the contact time between employees and materials is long, and improper disposal of emissions may easily cause secondary pollution; in addition, there are many manual steps, very low productivity, high processing costs, and large loss of raw materials.

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