| 摘要 |
<p>A process for the production of Mg metal from impure Mg-containing materials is disclosed. The process comprises the steps of reacting a slurry of impure Mg-containing material with a hot HCl-containing gas stream to produce an impure MgCl2 slurry, purifying the MgCl2 slurry to form a substantially pure MgCl2 solution, drying the substantially pure MgCl2 solution to produce a MgCl2 powder containing up to about 5% each of MgO and H2O, dehydration melting of the MgCl2 powder to produce molten anhydrous MgCl2, performing electrolysis of the molten anhydrous MgCl2 to produce Mg metal and Cl2, and recycling all of Cl2 produced during electrolysis to the above dehydration melting step for converting MgO and H2O present in the MgCl2 powder into MgCl2 and HCl and for producing the hot HCl-containing gas stream. Dehydration melting is preferably done by feeding the MgCl2 powder into the feed end of a rotary kiln, and reacting Cl2 produced during electrolysis with carbonaceous fuel and air in a burner located at the discharge end of the rotary kiln to produce a hot gas mixture containing HCl, CO, Co2, N2 and sufficient unreacted Cl2 to convert essentially all the MgO and H2O present in the MgCl2 powder into MgCl2 and HCl.</p> |
