Production process for converting deep pickling yellow phosphorus into electronic grade red phosphorus

Abstract

The invention discloses a production process for converting a deep pickling yellow phosphorus into an electronic grade red phosphorus. The industrial yellow phosphorus is successively subjected to thesteps containing deep pickling, chlorination, rectification, hydrogen reduction and atmospheric pressure high temperature conversion to obtain the electronic grade red phosphorus with the purity of 99.9999%. According to the above process, the traditional industrial yellow phosphorus pickling process is improved, on the one hand, a traditional relatively mild gas-introduction stirring is replacedby a mechanical deep stirring, and an interlayer outside the kettle is circulated with hot water to keep warm, so that the yellow phosphorus and nitric acid are fully contacted, impurities that cannot be removed by subsequent processes such as S, C, As and the like are removed, additives are not needed in the reaction process, the product purity is improved, the yellow phosphorus recovery rate isgreatly improved, and the yield of the electronic grade red phosphorus is increased; and on the other hand, a traditional quartz reaction kettle is replaced by an inner glass-lined cast iron kettle with an outer interlayer, so that production safety hidden dangers are reduced.

Description

technical field [0001] The invention relates to the preparation of elemental phosphorus, in particular to the preparation of electronic-grade red phosphorus (6N), and further relates to a production process for converting deep pickling yellow phosphorus into electronic-grade red phosphorus. Background technique [0002] Red phosphorus, molecular formula P 4 , molecular weight 123.8, white phosphorus allotrope, reddish-brown amorphous powder or block solid. Relative density 2.34g / cm 3 , melting point 590°C, fire point above 200°C, insoluble in water, carbon disulfide and organic solvents, slightly soluble in absolute ethanol. Electronic grade red phosphorus is one of the main materials for the synthesis of phosphorus compound semiconductors. It can be used to synthesize compound semiconductors such as indium phosphide (LnP) and gallium phosphide (GaP). It can also be used as a solid phosphorus source for IC doping. It is widely used in Integrated circuits, solar cells, cry...

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to provide a kind of production process that is converted into electronic grade red phosphorus by deep pickling yellow phosphorus, solves the poor effect of removing impurities (especially As, S and C) in the industrial grade yellow phosphoric acid washing process in the prior art, yellow phosphorus Low phosphorus recovery rate, insufficient stirring and potential safety hazards

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