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Production of electrolytic nickel powder

Electrolytic nickel powder is referred to use electrolytic method to prepare nickel powder, or the electrolysis-reduced nickel powder through hydrogen reduction annealing. 

This product is mainly used in the atomic energy industry, alkaline batteries, electrical alloy, high-temperature and high-strength alloys, catalysts and additives of powder metallurgy. Electrolytic nickel powder according to their chemical composition and physical properties can be divided into FND-1, FND-2 and FND-3 three grades. Wherein the FND-1 is belonging to electrolytic nickel powder, FND-2 and FND-3 are the electrolysis-reduced nickel powder. According to metal powder supplier, electrolytic nickel powder are generally require to determine zinc, lead, manganese, silicon, bismuth, arsenic, cadmium, tin, antimony, iron, copper, aluminum, magnesium, cobalt, calcium, carbon, phosphorus, sulfur and other 18 kinds of components.

Nickel is a chemical element. Chemical symbol is Ni, atomic number is 28, atomic weight is 58.69, belong to family VIII of periodic system. Ancient Egypt, China and Babylonians have been used high nickel content iron meteorite to produce artifacts, the copper-nickel alloy produced by ancient China is with high nickel content. In 1751, the Swedish chemists use charcoal reduce red nickel ore to get nickel, its English name comes from the German kupfernickel, meaning false copper.

Nickel content in the crust is 0.018%, the main mineral have pentlandite [(Ni, Fe )9S8], garnierite [(Ni, Mg)SiO3•nH2O], needle nickel ore or yellow nickel ore (NiS), red nickel ore (NiAs). The bottom of the sea manganese nodules, nickel have big reserves, it is nickel’s important prospective resources. Nickel is a kind of silver-white metal, the melting point is 1455°C, the boiling point is 2730°C, the density is 8.90g / cm3. With ferromagnetic and ductility, has electrical and thermal conductivity. In room temperature, in humid air, the nickel surface form a dense oxide film, not only can prevent it continually be oxidized, but also can resist the corrosion of alkali, salt solution. The massive nickel will not burn, fine nickel wire is combustible, special fine porous nickel particles in the air may ignite spontaneously. When heated, nickel is violently reacted with oxygen, sulfur, chlorine, bromine. The fine powder of metallic nickel powder can absorb a considerable amount of hydrogen gas when heated. Nickel can be slowly dissolved in dilute hydrochloric acid, sulfuric acid, dilute nitric acid, but in fuming nitric acid the surface passivation. Nickel’s oxidation state is -1, +1, +2, +3, +4, +2 is the most stable in simple compound, +3 valent nickel salt is the oxidant. Nickel oxides have NiO and Ni2O3. Nickel hydroxide [Ni(OH)2] is a strong alkali, slightly soluble in water, soluble in acid. Nickel sulfate (NiSO4) can form alum Ni (SO4)2 • 6H2O (MI is an alkali metal ion) with an alkali metal sulfate. +2 nickel ions can form of complex compound. Under pressure, nickel and carbon monoxide can be formed nickel tetracarbonyl [Ni(CO)4], after heating, it will be decomposed into metallic nickel and carbon monoxide.

The production methods of nickel: (1) electrolytic method, roasting the enriched sulfide ore into oxides, reduce into coarse nickel by carbon, then through electrolysis to get the pure nickel. a carbonylation, Nickel sulfide ore react with carbon monoxide to generate tetracarbonyl nickel, decomposition after heating, can obtain high purity nickel. (3) hydrogen reduction method, hydrogen reduce nickel oxide, can get nickel metal. Most of the nickel used for manufacturing stainless steel and corrosion-resistant alloys. Nickel is also extensively used for nickel plating. Nickel-copper alloy used for resistance alloy, heat exchanger and condenser tubes. Nickel- chromium-iron alloy was used in the manufacture of steam wind turbines and electric wire. In the chemical industry, nickel as a catalyst for the hydrogenation reaction.

Nickel is a silver-white metal, nickel make of stainless steel and alloy steel is widely used in aircraft, tanks, ships, radar, missiles, spacecraft and machinery manufacturing in civilian industry, ceramic pigments, permanent magnet materialsFree Web Content, electronic remote control and other areas. The amount of stainless steel is accounted for 66 % of the total amount.

Source:http://www.mhcmp.com

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