Experimental study on magnesium extracted from ascharite mineral by aluminium

In order to effectively utilize the ascharite mineral, in Liaoning province of China, the paper studied to extract magnesium from ascharite mineral with aluminum powder as reductant by vacuum thermal reduction process. And boron of the raw material was saved in residue that could be used as raw materials to produce non-alkali glass fiber. Environment cannot be polluted during this process, as well as the process can create great economic value. Calcined material and residue were taken XRD analysis. Based on thermodynamic analysis, the Gibbs free energy and critical temperature of reduction ascharite with aluminum were calculated. As a result, the critical temperature is 1302°C at ordinary pressure, and addition, the critical temperature will reduce farther when the air pressure is reduce in the retort, The recovery rate was effected remarkably by the mass of reductant and the making briquettes pressure.