CERPHOS process

CERPHOS process (Centre d Etudes et de recherche des Phosphates Mineraux) in the washing step the fine fraction, containing a particularly high impurity concentration, is separated in a hydrocyclone. Drying and calcining is carried out as in conventional calcium sulfate production. 

The Centre d Etudes et de Recherches des Phosphates Mineraux (CERPHOS) process was used in a plant of 30,000-tpy capacity in Senegal. It appears to be very similar to the CdF Chemie process except that more extensive purification of the phosphogypsum was used, and this involved wet screening, flotation, two washes, and calcium carbonate addition. The product was dried with heated air in a flash dryer and caldned in an indi-rect-fired kiln. 

Cerphos [Centre d Etudes et de Recherche de Phosphates Mineraux] A process for making gypsum, suitable for use as plaster, from the waste from the wet process for making phosphoric acid. 

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See also in sourсe #XX -- [ ]

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