Copper refined powder: copper is one of the earliest metals discovered and utilized by human beings, with purplish red color, specific gravity of 8.89 and melting point of 1083.4℃. Copper and its alloys are widely used because of their good electrical and thermal conductivity, strong corrosion resistance, workability, good tensile strength and fatigue strength. They are second only to steel and aluminum in the consumption of metal materials, and become indispensable basic materials and strategic materials in the national economy and people's livelihood, national defense engineering and even high-tech fields. Widely used in electrical industry, machinery industry, chemical industry, national defense industry and other departments. Copper fine powder is a concentrate with certain quality indexes obtained from low-grade copper-bearing raw ore after beneficiation, which can be directly used for copper smelting in smelters.