Cleaning retort used for silicon carbide impurity removal

Abstract

The invention relates to a cleaning retort used for silicon carbide impurity removal. The top of a retort body is provided with a slurry inlet and an acid inlet pipe; the bottom of the retort body is provided with a slurry outlet; the top of the retort body is shaped like an arch, and the highest place of the arch is provided with a plastic connection pipe; the plastic connection pipe is connected with a negative pressure source by an acid mist collection cover; the top of the retort body is provided with a lifting type stirrer by a portal frame. According to the cleaning retort, the lifting type stirrer is arranged on the retort body, can be descended to stir slurry, is separated from the inside of the retort body after ending stirring, and cannot influence the reaction between the slurry and acid; the top of the retort body is provided with the acid mist collection cover, so acid mist is prevented from corroding plant equipment, the recovered acid mist can be used again, and thus raw materials are saved and pollution of the acid mist to environment is avoided.

Description

technical field [0001] The invention relates to the field of production and preparation of silicon carbide, in particular to a cleaning reaction tank for removing impurities from silicon carbide. Background technique [0002] Due to its stable chemical properties, high thermal conductivity, small thermal expansion coefficient, and good wear resistance, silicon carbide has many other uses besides being used as an abrasive. The industrial method of silicon carbide is to use high-quality quartz sand and petroleum coke to refine it in a resistance furnace. Pure silicon carbide is colorless, while industrial production of brown to black is due to iron-containing impurities. The silicon carbide blocks obtained by refining are made into various kinds of silicon carbide blocks by crushing, acid-base washing, magnetic separation and screening or water separation. granular product. [0003] Since silicon carbide often contains impurities such as iron, it is necessary to purify and c...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the unsatisfactory iron removal effect existing in the use of magnetic separators to remove iron from silicon carbide in the prior art, the present invention provides a cleaning reaction tank for silicon carbide removal of impurities. Acid is added to the slurry for stirring to remove trace iron elements in silicon carbide

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