Process for the recovery of phosphate from phosphate rock

Details Process for the recovery of phosphate from phosphate rock Process for the recovery of phosphate from phosphate rock

C - Chemistry, Metallurgy

05

B

C05B 11/06 (2006.01) C01B 25/22 (2006.01) C05B 11/08 (2006.01)

Patent

CA 2428843

There is disclosed a wet process for the recovery of phosphate from phosphate rock which comprises leaching finely divided particles of phosphate rock with a protic acid at a temperature and for a time that favours dissolution, into a leachate, of the phosphate in relation to an impurity, and, isolating the leachate. An appropriate combination of particle size, leach time and leach temperature can achieve high phosphate recovery while reducing the amount of impurities.

L'invention porte sur un procédé par voie humide de récupération de phosphate dans la roche phosphatée et consistant à lessiver dans un lixiviat des particules finement divisées de roche phosphatée avec un acide protique à une température et sur une durée favorisant la dissolution du phosphate en contact avec des impuretés et à isoler le lixiviat. L'invention porte également sur une combinaison appropriée dont la granulométrie, la durée et la température de lixiviation permettent d'effectuer une récupération importante de phosphate et de réduire la quantité des impuretés.

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