Synthesis of Lithium Sulfide by Carbothermal Reduction of Lithium Sulfate with Petroleum Coke

The effect of the conditions of carbothermal reduction of lithium sulfate with petroleum coke on the composition of the resulting products and conversion of lithium sulfate was investigated. It was found that the optimal conditions for the carbothermal reduction of lithium sulfate with petroleum coke are a temperature of 750°C and a time of 1–2 h. The conversion of lithium sulfate is determined by the method of preparing the reaction mixture and is 80–90 mol %.