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This invention discloses a pure magnesium and its purification method. The purification method specifically includes the following steps: (1) placing pure Mg into a crucible and placing it in a melting furnace, setting the temperature of the melting furnace to 650~670℃, and introducing CO. 2 and SF 6 The mixture is protected with a gas mixture. After the pure Mg melts, the temperature is raised to 690~720℃. The Mg-5Mn master alloy is added to the crucible. After it is completely melted, the melt is stirred to make the alloy composition uniform. (2) Remove the slag on the surface of the melt, add the refining agent to the melt, and stir it thoroughly. Let it stand for 30~50 min. (3) After the melt cools down, a high-purity magnesium ingot is obtained. This invention can effectively reduce the Fe impurity content in magnesium metal and reduce the inclusions in magnesium metal.

The application discloses a kind of core-shell structure diamond micro powder and preparation method thereof, using highly dispersed few-layer graphene oxide solution to wrap diamond micro powder, then the diamond micro powder wrapped by graphene oxide is reduced to obtain the core-shell structure diamond micro powder wrapped by graphene, the obtained core-shell structure diamond micro powder, graphene is evenly coated on diamond particle outside, after coating, diamond particle is uniformly distributed, dense accumulation arrangement on microstructure, can reduce the friction between diamond micro powder particles under high pressure in the synthesis process of composite sheet, make it more dense accumulation, can solve the uneven distribution of prior art graphene in diamond micro powder, can prevent the residue of excess graphene in sintering process, and help the migration of metal catalyst and the formation of D-D bond, improve the performance of final product, prepare high-density high-strength diamond composite sheet.