Nickel is a silvery-white metal, the density is 8.9, melting point is 1455 , boiling point is 2915 °C. Nickel has a good mechanical strength, ductility and corrosion resistance.
In humid air at room temperature its surface form a dense oxide film, can prevent the base metal to continue to oxidize. The hydrochloric acid, sulfuric acid, an organic acid and an alkaline etching solution of nickel is slow. Nickel slowly dissolved in dilute nitric acid, strong nitric acid can passivate nickel surface and make it with corrosion resistant. Nickel is similar with the platinum and palladium, can absorb large amounts of hydrogen, the smaller the particle size, the greater amount of absorption. Nickel salts are nickel sulfate and nickel chloride.
Nickel belong to the siderophile elements, there are almost 60 kinds of nickel mineral in nature, and about 10 kinds of minerals with industrial value: pentlandite, purple sulfur nickel ore, needle nickel ore, pyroxene nickel ore, nickel-containing pyrrhotite square-sulfur nickel ore niccolite niccolite hui niccolite, nickel serpentine, nickel chlorite, green kaolinite, green nickel ore, nickel, magnetite, nickel alum, morenosite zaratite.
Nickel sulfide ore deposits in vulcanization rate, that was nickel sulfide state ratio of nickel ore is divided into: primary ore, mixed ore, oxide ore. Nickel sulfide ores can be divided into three grades: special-rich ore, rich ore, lean ore nickel content. Need rich ores and depleted ore through mineral separation to get nickel concentrate and then smelting again especially rich ore can directly into the furnace smelting.
Nickel powder is a very important metal raw material, Nickel's main purpose is to manufacture stainless steel, high nickel alloy steel and alloy structural steel is widely used in aircraft, radar, missiles, tanks, ships, spacecraft, atomic reactors and other military manufacturing industry structural steel with nickel; in civilian industry, a large number of acid-resistant steel, heat-resistant steel made of nickel widely used in various machinery manufacturing industry, the oil industry; nickel with chromium, copper, aluminum, cobalt and other elements can be composed of non-ferrous alloys, nickel based alloys, nickel-chromium-based alloy is high temperature oxidation resistant material used in the manufacture of jet turbine, resistance heating element, high temperature equipment and structural components; the nickel also for ceramic pigments and anticorrosive coating; nickel-cobalt alloy is a permanent materials are widely used in electronic remote control, the atomic energy industry, and ultrasound technology and other fields, nickel is often used as a hydrogenation catalyst in the chemical industry.
According to the research of metal powder supplier, Chinese nickel ore resources is rich, the proven nickel mine is located in Chinese 18 provinces, autonomous regions. From the distribution area, mainly in the northwest, southwest and northeast regions.
The characteristic of nickel resources in China: (1) Reserves highly concentrated, just Gansu Jinchuan nickel mine is already accounted for 63.9% of the country's total reserves, Xinjiang Kalatongke and Huangshan those three copper-nickel ores reserves also accounted for 12.2% of the country's total reserves to maintain. (2) mainly copper sulfide nickel ore, accounting for 86% of the country's total reserves to maintain, followed by nickel laterite, accounting for 9.6% of the country's total reserves to maintain. (3) high-grade nickel ore, the average nickel content is greater than 1% nickel sulfide-rich ore accounted for about 44.1% of the country's total reserves to maintain. (4) the degree of geological work of nickel ore is relatively high, the exploration level reserves accounted for 74% of the country's total reserves. (5) a larger proportion of nickel ore underground mining, accounting for 68% of the country's total reserves to maintain and suitable for open-pit mining accounts for only 13%. Compared to other countries which have rich and high grade ore, such as New Caledonia, Indonesia, Chinese oxidized nickel ore is relatively small, and the grade of nickel oxide ore is relatively low and uncompetitive.
Source:http://www.mhcmp.com
The application of tungsten in various industries
Steel Industry Most of tungsten applied in the production of special steels. The widely used high-speed steel was containing 9-24% of tungsten, 3.8-4.6% of chromium, 1-5% of vanadium, 4-7% of cobalt, 0.7-1.5% of carbon.
Magic effects of coconut oil
According to records, coconut oil can be regarded as the nobility of skin care plant extracts. It was rich in exotic tension of tropical plants, which can enhance the contractile force of the pores, perfectly beautify and nourish the skin.
The development trends of aloe vera extract in the international market
Aloe is a kind of perennial Liliaceae succulent herbaceous plant, originated inAfrica, belonging to tropical plant. The cultivation of aloe can be both in the open field and greenhouse.
