C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/280
C01F 5/02 (2006.01) C01D 5/06 (2006.01) C01F 5/10 (2006.01) C01F 11/46 (2006.01)
Patent
CA 1073185
ABSTRACT OF THE DISCLOSURE In an industrial process of preparing high-purity magnesia from an impure magnesium-containing starting material, wherein the starting material is dissolved in HCl and the resultant acidic solution is subjected to a multi-step treatment for precipitating the impurities out of the solution, the precipitate is separated from the residual purified magnesium chloride solution, and the magnesium is thermally decomposed to obtain magnesia, the purified magnesium chloride solution is first concentrated and sulfate ions are then added thereto to precipitate calcium ions from the concentrated solution as calcium sulfate.
265689
Grill Michael
Grohmann Helmut
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