Veitscher Magnesitwerke-actien-gesellschaft

Veitscher Magnestiwerke-actien-gesellschaft

Michael Grill

Helmut Grohmann

Gerhard Graf

Andreas Meier

Finely powdery magnesium hydroxide and a process for preparing thereof

Process for producing pure magnesium oxide

The present invention relates to a process for the recovery of magnesium oxide of high purity in which the magnesium oxide is obtained by thermal decomposition of a magnesium chloride brine previously purified. The magnesium chloride brine itself is obtained by decomposition of impure starting material with hydrochloric acid and purified before the thermal decomposition. In doing so the brine obtained by the decomposition is first concentrated and the separation of the impurities is effected only then. Calcium is separated in form of calcium sulfate. Optionally calcium sulfate and other impurities may be separated together.

Process for the recovery of magnesium oxide of high purity

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 multistep treatment for precipitating the impurities out of the solution, the precipitate is separated from the residual purified magnesium chloride solution, and the magnesium chloride 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.

Industrial process of preparing magnesia of high purity

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Leoben, Austria

Michael Grill