Preparation method of silicon steel grade magnesium oxide

At present, the raw materials for preparing silicon steel grade magnesium oxide mainly include magnesite (MgCO3), dolomite (CaCO3 MgCO3), magnesium-containing industrial by-products, seawater or salt lake brine (MgCL2), etc. The production process can be divided into basic magnesium carbonate Magnesium ore carbonization method and ammonium bicarbonate method as intermediate, brine pyrolysis method with basic magnesium chloride as intermediate.

1. Preparation of silicon steel grade magnesium oxide from salt lake brine

Bischofite (MgCL2 6H2O) is dissolved and filtered to remove solid suspended impurities to obtain brine, which is reacted with ammonia to prepare intermediate magnesium hydroxide: MgCL2+2NH3+2H2O=Mg(0H)2+2NH4CL

Magnesium hydroxide is calcined at high temperature to obtain magnesium oxide: Mg(OH)2=Mg0+H2O

2. Preparation of silicon steel grade magnesium oxide by carbonization of magnesium ore

The magnesium ore carbonization method (dolomite, magnesite, etc.) is calcined at high temperature, and the calcined magnesium oxide is hydrated, carbonized, and filtered to achieve the purpose of completely separating magnesium from impurities, and the magnesium-containing filtrate is then pyrolyzed to generate alkali Formula magnesium carbonate precipitates, the precipitate is filtered and calcined, and finally the magnesium oxide product is obtained. The process flow is shown in Figure 1 and Figure 2.

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