The,uses,and,smelting,method,s business, insurance The uses and smelting method of silicon metal
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At present,the international general put the silicon goods into metal silicon andsemiconductor silicon. Silicon metal is made of quartz and coke in the electricheating furnace smelted into products, principal component silicon content isabout 98% ( in recent years, also have content 99.99% Si of silicon metal ),the remaining impurities is iron, aluminium, calcium. Semiconductor siliconused in producing semiconductor device of high purity silicon metal. Is sell aspolycrystalline, single crystal morphology, the formal is cheap, the latter is expensive.Due to its different use, it is divided into a variety of specifications.According to statistics, in 1985 the world total consumption of silicon metalis about 500000 tons, the silicon which is used for aluminum alloy metal is accountedfor about 60%, for the silicone is less than 30%, for semiconductor is accountedfor about 3%, others used for steel smelting and precision ceramic.Metallic silicon can be used for preparingsuper pure silica, through crushing the raw material, impurity compounds,crystallization purification of three sequential steps of principle, adopts thecombination of various procedures operations: the metal silicon broken intofine particles to increase the surface area; pass into the oxygen, chlorine,hydrochloric acid in the silicon particles, conduct combination reaction in thesilicon impurity, in order to make the impurities in silicon generated into oxideor chloride by high temperature; use high temperature to make low sublimationtemperature chloride evaporation removal, again using the individual elementsegregation coefficient and oxide eutectic solidification characteristics, withthe intermediate technology or directional solidification technique furtherremoval the impurities in silicon. Through the above process and device toremove impurities in silicon, make the silicon metal purified into ultra puresilicon products.In industry, metal silicon is usually preparedby reduction of silica in an electric furnace carbon. The produced siliconpurity is 97~98%, called silicon metal. Then melt it and crystallization, use acidto remove impurities, get the purity of 99.7~99.8% silicon metal. Silicon metalcomponent is silicon, thus having similar properties with silicon. Silicon has amorphoussilicon powder andamorphous silicon two allotropes. Amorphous silicon powder is dark gray powder,is in fact a microcrystal. Crystalline silicon has the crystal structure ofdiamond and semiconductor properties, the melting point is 1410 ,boiling point is 2355,the density is 2.32 to 2.34 g/ cm 3, Mohs hardness is 7, brittle. Amorphous silicon powder with activechemical properties, can burn in oxygen. It can react with halogen, nitrogen,carbon and other non-metallic at high temperature, also can react withmagnesium and calcium, iron and other metals, form of silicide. Amorphous siliconpowder is virtually insoluble in all including hydrofluoric acid, inorganicacid and organic acid, but soluble in nitric acid and hydrofluoric acid mixedacid. Concentrated sodium hydroxide solution can dissolve the amorphous siliconpowder, release hydrogen. Crystalline silicon is less active, even at hightemperatures will not react with oxygen, it will not dissolve in any kind ofinorganic acid and organic acid, but soluble in nitric acid and hydrofluoricacid mixed acid and concentrated sodium hydroxide solution.Silicon metal smelting is a highenergy-consuming production, Chinese silicon metal production haslong-standing, along with the national energy policy tightening and energysaving, and emission reduction and new energy development advocating, metalsilicon smelting has become the primary products and technology, many of Chinesenew energy industry construct metal silicon, polycrystalline silicon,monocrystalline silicon, solar cell and other a series of cycle of industrialchain, in the next few years will inevitably affect the development of thefield of energy and new energy applications.Source:http://www.mhcmp.com Article Tags: Amorphous Silicon Powder, Silicon Metal, Metal Silicon, High Temperature, Amorphous Silicon, Silicon Powder, Hydrofluoric Acid
The,uses,and,smelting,method,s