A crucible manufacturing process for smelting rare and precious metals

Abstract

The present invention provides a manufacturing process for manufacturing a crucible used for smelting rare and noble metals. The manufacturing process comprises the following steps of 1, briquetting the oxide powders of rare and noble metals into a block by means of a powder press, crushing and sieving to obtain a fine-particle-size blank, a medium-particle-size blank and a coarse-particle-size blank; 2, uniformly mixing up the fine-particle-size blank, the medium-particle-size blank and the coarse-particle-size blank in a certain proportion to obtain a mixed blank; 3, putting the mixed blank into a mold, tamping and molding the mixed blank to form a tamped and formed part; 4, putting the tamped and formed part with the mold into a medium-frequency induction heating furnace to subject the tamped and formed part to dehumidification and sintering treatment, and demolding to obtain a crucible used for smelting rare and noble metals. According to the technical scheme of the invention, multiple aspects, including the granulating, the proportioning and the mixing of raw material powders, tamping, molding, sintering control and the like, are deeply studied and optimized for multiple times. Finally, the obtained crucible is free of holes, cracks and other defects, high in quality and long in service life.

Description

technical field [0001] The invention belongs to the technical field of crucible manufacturing, and in particular relates to a crucible manufacturing process for smelting rare and precious metals. Background technique [0002] Metal smelting crucibles are an essential carrier in the metal smelting process. In the smelting process of rare and precious metals, it is required that the crucible can not only satisfy the smelting, but also prevent the pollution of the metal during the smelting process. In the industry, the oxide of the metal is often used to make the crucible, so that the metal oxide crucible produced has a much higher melting point. For the rare and precious metal, and the metal will not be mixed with other impurities during the melting process. [0003] However, since high-purity metal oxides are often made of nano-scale powder raw materials, directly rammed and sintered, a series of problems such as holes and cracks will appear in the process of making the cruc...

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Problems solved by technology

[0003] However, since high-purity metal oxides are often made of nano-scale powder raw materials, directly rammed and sintered, a series of problems such as holes and cracks will appear in the process of making the crucible, which seriously affects the service life of the crucible or cannot be formed at all. crucible

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