Method for etching phosphate ores

Details Method for etching phosphate ores Method for etching phosphate ores

2004-12-23

2010-11-02

Mayes, Melvin C (Department: 1793)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

C423S321200, C423S157300

Reexamination Certificate

active

07824634

ABSTRACT:
A method for etching phosphate ores includes a single-pass digesting of ores which P205content is greater than 20% in weight by a hydrochloric aqueous acid solution having an HCI concentration less than 10% by weight with an etching solution formation and the separation of the insoluble solid phase and the aqueous phase of the etching solution. Preneutralization of the etching solution is accomplished by a neutralizing agent prior to the separation in such a way that the etching solution pH which is less than pH to which an important part of phosphate ions in solution precipitates in the form of calcium monohydrogen phosphate (DCP) is adjusted and in subsequently neutralizing the separated aqueous phase in such a way that a pure DCP is precipitated.

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