Nickel is a precious metal, reserves are limited, nickel ore grade is very low, produce 1t of nickel needs 260 tons of nickel ore, its refining process is much more complex than the copper.
Nickel with magnetic at room temperature, but when it heated to 350°C, the magnetic disappeared. Nickel has widely use, plating it to other metal products, can prevent surface corroding, such as medical and surgical appliances, in order to facilitate disinfection, the surface were coated nickel. Nickel is also used to prepare a variety of alloys, such as a variety of high-alloy nickel-containing stainless steel, heat resistant steel (high-temperature steel), precision alloy, permanent magnets and nickel-containing low alloy steel. Nickel is also commonly used for the preparation of various nickel-based alloy, copper-based alloy and heat-resistant alloy, it has a high degree of process performance and extremely valuable physical and chemical properties, high heat-resistance, high corrosion resistance and good plasticity, is a kind of indispensable raw materials for telecommunications appliances, instrumentation, medical industry, metal powder industry, chemical industry.
Scrap nickel classification is divided according to the nickel-containing ingredients, can generally be divided into three categories. The nickels class, There are two kinds. One nickel issued by the Chinese government in the 1920s, is generally used to call the old nickels, this nickel’s nickel content is about 95%, light side, white color, can be attracted by magnet. Another nickel was issued by Yunnan, China in the 1930s, generally call it the new nickels. This kind of nickel contains about 20% of nickel. The new nickels mainly contain copper, can not be attracted by magnet, the social stock is running out.
Pure nickel, pure nickel is not accompanied by any other metals’ nickel sheet, bar, ingot, nickel powder, etc., pure nickel’s nickel content is between 97%-99%, its feature is silver-white, slightly with light green, shiny, magnetic, can be attracted by magnet, soft and tough, fine internal organization, close structure. Pure nickel is mainly derived from the producers who use nickel as raw materials.
Hetero nickel, hetero nickel’s species is actually more complex, in fact, it is a nickel alloy containing more than 25% of nickel. Including the nickel-iron alloys, nickel-chromium alloys, nickel-chromium-iron alloy, nickel-chromium-tungsten alloy, molybdenum-iron alloy, nickel-copper alloy, nickel-copper-iron alloy, nickel-copper-manganese alloy and so on. The identification methods of nickel waste miscellaneous, can take the approach of grinding sparks, grinding the sample in the fast grinding wheel, watching the sparks to determine what kind of alloy. Also can take the chemical qualitative method, place the sample in test tubes, injecting a dissolving agent aqua regia and dissolved to observe the color to determine what kind of alloy. Nickel wire, nickel powder, nickel plate, nickel belt in telecommunications equipment, electroplating factory’s leftover nickel head, nickel plate and so on. The surface is silvery white, slightly greenish after oxidation, grinding with a grinding wheel, show up fuchsia spark, shorter flames; can be attracted by magnet.
The utilization of scrap nickel, a pure nickel scrap excluding other alloys, can be directly used for the raw materials for various industrial or smelting nickel alloy plating. Waste hetero nickel (including old and new nickel coin), if can clearly identify it belong to which alloys, it still can be used in smelting the same grade alloy; can not distinguish grades, also not contain cobalt, copper, tungsten, molybdenum and other elements, can be used as raw materials of smelting nickel-chromium stainless steel; if the composition is very complex, can be used as raw material of rolling drum. A nickel-containing waste water, waste residue, garbage mud, etc. can be extracted nickel oxide, nickel chloride, nickel nitrate, nickel sulfate, nickel hydroxide nickel and a variety of chemical raw materials, but the extraction process is more complicated, stronger technicality, higher cost.
Source:http://www.mhcmp.com
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