Method for preparing phosphoric acid

Details Method for preparing phosphoric acid Method for preparing phosphoric acid

C - Chemistry, Metallurgy

01

B

C01B 25/222 (2006.01)

Patent

CA 2279953

A method for preparing phosphoric acid from calcium phosphate ores, particularly ores highly contaminated with organic compounds, by decomposing the ore with sulphuric acid, wherein according to the invention the process of decomposition of calcium phosphate ores with sulphuric acid and circulating phosphoric acid is carried out in oxidizing conditions provided by a constant supply of ozone to the reaction slurry, preferably to the zone of commencing decomposition of the phosphate ores.

Selon un procédé permettant de préparer de l'acide phosphorique à partir de roches contenant du phosphate de calcium, notamment de roches fortement contaminés par des composés organiques, on décompose ladite roche avec de l'acide sulfurique. Selon l'invention, le procédé permettant de décomposer des roches contenant du phosphate de calcium avec de l'acide sulfurique et de l'acide phosphorique circulant s'effectue dans des conditions oxydantes dues au fait qu'on amène en continu de l'ozone à la boue de réaction, de préférence à la zone où commence la décomposition des roches contenant le phosphate.

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