| 摘要 |
<p>1498511 Preparing magnesium BILLITON RESEARCH BV 17 Feb 1975 [18 Feb 1974] 6589/75 Heading C7D A process for the preparation of Mg by reducing an oxidic Mg containing material at high temperature by means of carbon wherein Fe, Co, Ni, Cr or Mn is also present in the reaction mixture and the reduction takes place at a temperature between 1,000‹ and 2,000‹C. A pressure range of 10<SP>-5</SP> to 10<SP>4</SP>mm. Hg may be employed in particular a stoichiometric excess of carbon e.g. graphite may be admixed with MgO and Fe and the mixture subjected to reduction under elevated pressure conditions, the product being used as a desulphurizer for steel or iron. Alternatively the reduction may be carried out at sub-atmospheric pressure using less than the stoichiometric amount of carbon, the reduced Mg being removed by evaporation and the residue admixed with further MgO and carbon to provide a second mixture containing less than the stoichiometric amount of carbon which is reduced also under sub-atmospheric pressure.</p> |
