Method of classifying metallurgical silicon

Metallurgical silicon containing impurities of carbon and/or carbon-containing compounds is classified and subsequently used selectively for chlorosilane production. The process comprises the steps of:a) determining the free carbon proportion which reacts with oxygen up to a temperature of 700° C.,b...

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Bibliographic Details
Main Authors Rimboeck, Karl-Heinz, Paetzold, Uwe, Traunspurger, Gerhard
Format Patent
LanguageEnglish
Published 04.07.2023
Subjects
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
METALLURGY
NON-METALLIC ELEMENTS
PHYSICS
TESTING
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Summary:Metallurgical silicon containing impurities of carbon and/or carbon-containing compounds is classified and subsequently used selectively for chlorosilane production. The process comprises the steps of:a) determining the free carbon proportion which reacts with oxygen up to a temperature of 700° C.,b) directing metallurgical silicon in which the free carbon proportion is ≤150 ppmw to a process for producing chlorosilanes and/or directing metallurgical silicon in which the free carbon proportion is >150 ppmw to a process for producing methylchlorosilanes.As a result of the process, metallurgical silicon having a total carbon content of up to 2500 ppmw can be used for producing chlorosilanes.
Bibliography:Application Number: US201816603662