Nickel is a silvery white metal, hard, magnetic properties and good plasticity and corrosion resistance. Widely used in industrial nickel is how preparation? Here we come to you a brief introduction to the system of law of the nickel.
In general, the nickel metal in a room temperature humid air on its surface will form a dense oxide film can prevent the base metal can continue to oxidation. Hydrochloric acid, sulfuric acid, organic acid and alkaline solution is very slow erosion of the nickel. Strong nitric acid can make the nickel surface passivation and corrosion resistance. Nickel with platinum, palladium, as passivation can absorb large amounts of hydrogen, the smaller the particle size, the greater the absorption. Nickel salts, nickel sulfate and nickel chloride. Iron, cobalt, water and air at room temperature are more stable and resistant to alkaline corrosion. It is above nature, the preparation method of metal nickel to become increasingly diverse.
Commonly used nickel method for making the following categories:
1. An electrolytic method. Enrichment of sulfide ore roasting oxides, carbon reduction into a crude nickel, pure nickel by electrolysis.
2. carbonylation. Will generate four nickel carbonyl nickel sulfide ore with carbon monoxide role, heated to decomposition, but also have high purity nickel.
3. hydrogen reduction method. Hydrogen reduction of nickel oxide, nickel metal.
With the continuous development of the nickel production method, the use of nickel is more extensive. At present, the nickel metal is mainly used to manufacture stainless steel and other anti-corrosive alloy with high nickel content of the copper-nickel alloy such as nickel steel, nickel chromium steel and a variety of non-ferrous metal alloy, it is not likely to corrode. Among them, titanium-nickel alloy is the ability to “remember”, but the memory strong – a very long time, repeated thousands of times are accurate. Its “memory” ability to remember its original shape, so people call it “shape memory alloy. Of nickel can be used as a hydrogenation catalyst for ceramics, containers of specialty chemicals, electronic circuits, glass preparation of green and nickel compounds.
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