Title: Method for the prepn. of feeding prade calcium phosphate
Application Number: 85105315 Application Date: 1985.07.08
Publication Number: 1006463 Publication Date: 1987.01.07
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: A23K1/175,C01F11/00
Applicant(s) Name: Guiyang Inst. Chem. Ind. Bureau of Chem. Ind., Gui Address:
Inventor(s) Name: Cai Huiqian
Attorney & Agent: WANG LONGNA XIA LIN
Abstract:
     It is from calcium phosphate and milk of lime. In the commercial perphosphate an adequate amount of 8.5-10.5% milk of lime is added for the purpose of proceeding defluorination reaction. The reactants are then filtered and washed. The filtrate is put into crystallization tank in which is added excess of milk of lime with the dame concentration obove to proceed crystallization. The dry product contains no more than 0.2% of fluorine that fulfills the standard for feeding.
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