Process for the preparation of a magnesium chloride solution...

Details Process for the preparation of a magnesium chloride solution... Process for the preparation of a magnesium chloride solution...

C - Chemistry, Metallurgy

22

B

C22B 3/10 (2006.01) C22B 7/00 (2006.01) C22B 26/22 (2006.01)

Patent

CA 2235424

A process for the preparation of a magnesium chloride solution by lixiviation of asbestos tailings with an aqueous solution of hydrochloric acid having a concentration of about 20% by weight. In this process, the asbestos tailings used as starting material have a granulometry equal to or lower than 62 mesh; the lixiviation is carried out at a temperature close to the temperature of ebullition of the mixture, this temperature of ebullition ranging between 115 and 120°C; and the lixiviation is carried out with asbestos tailings and hydrochloric acid in such amounts that the stoichiometric ratio tailings/HCl ranges between 1.2 and 2.25. Under the above conditions of operation, the time required to obtain almost entire transformation of the hydrochloric acid into magnesium chloride and other metal chlorides is of about 5 to 15 min. and there is no filtration problem because of the presence of silica gel.

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