Process for preparing calcium salts of low aluminum content

Details Process for preparing calcium salts of low aluminum content Process for preparing calcium salts of low aluminum content

C - Chemistry, Metallurgy

01

B

C01B 25/32 (2006.01) C01F 11/00 (2006.01) C01F 11/18 (2006.01)

Patent

CA 2142663

ABSTRACT OF THE INVENTION A process is provided for manufacturing a calcium salt, e.g., tricalcium phosphate, dicalcium phosphate or calcium carbonate, of low aluminum content starting with a calcium oxide (lime) containing a relatively high level of aluminum as an impurity. The calcium oxide is reacted with hydrochloric acid in aqueous medium to provide dissolved calcium chloride and a solid residue containing the impurities, including aluminum, originally present in the calcium oxide. The low-aluminum content calcium chloride which is recovered from the reaction medium is thereafter converted to another correspondingly low-aluminum content calcium salt employing known chemical procedures.

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