Method for preparing lithium metal through vacuum hot reduction of iron

The present invention relates to a method for preparing lithium metal through vacuum hot reduction of iron. Lithium carbonate with a purity which is larger than or equal with 98% is used as raw material. Iron powder with a purity which is larger than or equal with 98% is used as a reducing agent. The iron powder and the lithium carbonate are mixed. The mixture is prepared to pellet shape or sheet shape. Vacuumizing is performed on the mixture. Calcining and heat insulation are performed. Heat increase is performed in a vacuum. The reduced lithium metal volatilizes in a gaseous state. The lithium metal is obtained after condensing the volatilized gas. According to the method of the invention, lithium carbonate is used as raw material; and the iron with advantages of abundant resource and low price is used as a reducing agent. The method for preparing the lithium metal through vacuum hot reduction of the iron has the following advantages: short flow, simple process, convenient operation, low cost, low environment pollution, etc.