First, physical and chemical properties of nickel

☆ nickel is a silver-white ferromagnetic metal, is the main component of many magnetic materials.

☆ nickel also has good oxidation resistance and strong corrosion resistance.

Nickel is a silver-white ferromagnetic metal. Density 8.9 g /cm3, melting point 1455℃.

The ancient egyptians, Chinese and babylonians all used meteorite with high nickel content as objects. It can be said that nickel is both "old" and "young" metal.

Nickel has magnetism and is the main component of many magnetic materials.

Nickel also has good oxidation resistance, in the air, the nickel surface formed NiO film, can prevent further oxidation.

It is proved that the purity of nickel is 99% and will not rust for 20 years. The corrosion resistance of nickel is very strong, especially to caustic alkali. The corrosion rate of nickel in 50% boiling caustic sodium solution is no more than 25 microns per year.

Nickel also has good strength and plasticity and can be processed under various pressures.

The second one is the use of nickel

☆ nickel is widely used to manufacture various types of stainless steel, soft magnetic alloy and alloy structural steel.

☆ nickel is nickel - cadmium, nickel - hydrogen battery and nickel mesh production of the main material.

☆ nickel is also widely used in electroplating and catalyst production.

Nickel is widely used in the manufacture of various types of stainless steel, soft magnetic alloy (can be simply understood as: the magnetic field is easy to magnetize under the action of the external magnetic field, magnetic induction intensity (magnetic sense) and basic disappearance of magnetic alloy. We are mainly talking about ni-fe soft magnetic alloys. And alloy structural steel.

Nickel and chromium, copper, aluminum, cobalt and other elements can be composed of heat resistant alloy, electrical alloy and corrosion resistant alloy.

Nickel-chromium alloy (such as ni-cr20) has high heat resistance and large resistance. The thermoelectric elements (resistance wire) made of it can be used as heating elements of electric furnace, electric iron, electric iron, etc., which can work at 1100℃ for a long time. Ni-cr9 and ni-cr10 although slightly poor heat resistance, but large resistance, small resistance temperature coefficient, large thermoelectric potential, is a good material for thermocouple.

Nickel-based heat resistant alloys are mainly used in turbine engines, combustion Chambers and turbine blades. The famous "monel" alloy is a corrosion resistant nickel alloy containing copper, iron and manganese, with high strength, good plasticity and corrosion resistance.

A new orthodontic alloy, ti-ni alloy, has been developed by Beijing nonferrous research institute of China. The orthodontic of deformed teeth is realized by the springback property of metal.

Nickel-silicon alloy is often made into wire, strip, rod used in electronic tubes and electrical vacuum instruments.

Ni-fe and ni-co alloys are good magnetic materials. Nickel is the main material for nickel - cadmium, nickel - hydrogen battery and nickel mesh production. Meanwhile, nickel is also widely used in electroplating and catalyst production.

The third talk several kinds of nickel making method brief introduction

☆ electrolysis method ☆ carbonylation method ☆ hydrogen reduction method

(1) electrolysis. The enriched sulfide ore is calcined to oxide, reduced to coarse nickel with carbon, and then pure nickel is obtained by electrolysis.

(2) carbonylation. The sulfide ore of nickel reacts with carbon monoxide to form tetracarbonyl nickel.

Hydrogen reduction. Metal nickel can be obtained by reducing and oxidizing nickel with hydrogen