Production of pure mgc12 solution suitable for the...

Details Production of pure mgc12 solution suitable for the... Production of pure mgc12 solution suitable for the...

C - Chemistry, Metallurgy

01

F

23/175

C01F 5/26 (2006.01) C01F 5/30 (2006.01) C22B 26/22 (2006.01)

Patent

CA 1279976

Abstract of the Disclosure A process for producing a substantially pure, concentrated MgCl2 solution suitable for subsequent molten salt electrolysis to magnesium metal from an impure magnesite ore or concentrate is disclosed. The process comprises the steps of calcining a magnesite ore or concentrate at a temperature greater than 600°C to decompose most of the magnesite and form a reactive magnesia, dissolving such reactive magnesia with either concentrated hydrochloric acid or hydrogen chloride gas with the addition of a surface active wetting agent to produce an impure concentrated MgCl2 solution, and reacting such impure concentrated MgCl2 solution with a minimum of excess magnesia to increase the pH of the solution to at least 5.5 to precipitate undesirable impurities from solution and produce a substantially pure MgCl2 solution.

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