Method of carbothermic process of magnesium production and co-production of calcium carbide

A carbothermic process of magnesium production and co-production of calcium carbide, comprising steps of:

• S1:
• preparing a mixed powder containing magnesium oxide, calcium oxide and a carbon reducing agent;
• S2:
• processing the mixed powder into a pelletized furnace feed material and placing it into a reactor equipped with a heat source;
• and
• S3:
• with an absolute pressure P in the reactor being set within a range of 1000 Pa≤P≤a slightly positive pressure and a reaction temperature T within a range of 30lg2P+58lgP+1215° C.<T<98lg2P−129lgP+1300° C., running a smelting reaction, and obtaining liquid magnesium through condensation by a condenser connected to the reactor and the calcium carbide within the reactor;
• wherein the slightly positive pressure refers to a positive pressure not 1000 Pa higher than a local atmospheric pressure;
• wherein the smelting reaction produces a calcium vapor that always reacts with the carbon reducing agent to produce the calcium carbide.