Production of pure MgCl.sub.2 solution suitable for the producti

Details Production of pure MgCl.sub.2 solution suitable for the producti Production of pure MgCl.sub.2 solution suitable for the producti

1987-05-11

1988-05-10

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 70, 423158, 423155, 423163, 423481, 423486, C25B 100

Patent

active

047433477

ABSTRACT:
A process for producing a substantially pure, concentrated MgCl.sub.2 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.degree. 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 MgCl.sub.2 solution, and reacting such impure concentrated MgCl.sub.2 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 MgCl.sub.2 solution.

REFERENCES:
patent: 2398493 (1946-04-01), Butt et al.
patent: 2398891 (1946-04-01), Julien

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