Overview of nickel
Physical and chemical characteristics of nickel
Metal nickel, chemical symbol Ni, atomic number 28, density 8.902 g/cm 3 , melting point 1453 ° C, boiling point 2732 ° C. Nickel is a silver-white metal. It has good strength and ductility at low temperatures. At room temperature, a dense oxide film forms on the surface in humid air, which prevents the oxidation from continuing. Nickel is also easily alloyed with other metals.
Main use of nickel
Nickel is an important industrial metal widely used in the steel industry, machinery industry, construction industry and chemical industry. Specific uses include: first, as a metal material, including stainless steel, heat-resistant alloy steel and various alloys; second, for electroplating, covering a substrate of steel and other metal materials with a durable, corrosion-resistant The surface layer has higher corrosion resistance than the galvanized layer; thirdly, it is used as a catalyst in the hydrogenation process of petrochemicals; fourth, it is used as a chemical power source to prepare raw materials for nickel-hydrogen batteries and nickel-cadmium batteries; And dyes, making new materials such as ceramics and ferrite.
Main classification of nickel
Nickel can be divided into primary nickel and regenerated nickel according to the different raw materials. The raw material for the production of raw nickel comes from nickel ore, and the raw material for the production of recycled nickel comes from nickel-containing waste. Primary nickel includes electrolytic nickel, nickel iron, and nickel salts. Among them, according to the national standard GB/T6516-2010, electrolytic nickel can be divided into five grades: Ni9999, Ni9996, Ni9990, Ni9950, Ni9920; nickel iron, also known as nickel-containing pig iron, is an alloy of nickel and iron, mainly composed of laterite nickel. The ore is smelted and sintered by fire method. The nickel metal content of ferronickel is about 5%-30%. According to the nickel content, it can be divided into high nickel pig iron, medium nickel pig iron and low nickel pig iron.
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