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The Production Process Of Ferronickel And Nickel According to metal powder supplier, pure nickel is silvery white, nickel can form compounds with some elements. Nickel and carbon can form Ni3C, decomposition into nickel and carbon at 380. But the Ni3C in liquid is stable until 2000. Nickel and oxygen can form NiO, NiO is rhombohedral, heating to above 200 will become cubic crystal. Melting of oxygen in solid nickel decreased with the increase of temperature. Nickel and sulphur can form Ni3S2, Ni6S5, Ni7S6, NiS, Ni3S4 and NiS2 nickel sulfide. In the industrial nickel, cannot find the nickel sulfide NiS and NiS2 exists in the nature, because these two kinds of nickel sulfide below the melting point had already decomposition. Nickel and iron in the gamma region formed continuous solid solution. The liquid phase at 1436 , containing 65%-72% nickel, appear a not very obvious nadir. Nickel can expand the gamma region, in the solid state, is divided into several phases, from which a number of phase during tempering, can form FeNi3. Modern produce nickel powder has fire metallurgy and hydrometallurgy two main methods. According to the two main types containing nickel minerals in the world (containing nickel sulfide ore and oxide ore) different, smelting process is different. Nickel sulfide ore is mainly used for fire processing, through concentrate roasting furnace (EAF or blast furnace) smelting of copper nickel sulfide converting nickel concentrate electrolytic metal nickel. Oxidized ore is mainly containing nickel laterite ore, the grade is low, suitable for wet processing; the main methods have ammonia leaching and sulfuric acid. The oxide ores pyrometallurgical method is nickel iron method. Use fire smelting processing nickel oxide to produce ferronickel and nickel metal, oxide silicate minerals can melt with fire smelting, through reducing, melting and refining to get nickel. while reducing should strive for nickel oxide to completely turned into metal nickel. Melting tattle and prate ferronickel with lighter slag separation. Nickel ferronickel in partial reduction depends on the ability to select the process. Using coke as reducing agent, also can use silicon as reductant. In order to remove carbon, sulfur, phosphorus and chromium impurities in coarse nickel iron, should be refined. Using the method of smelting nickel matte to prepare nickel pill is making the ore into pellets, after being sintered with coke and gypsum added to the low shaft furnace for smelting. After calcium sulfate is reduced, will react with nickel and iron generate sulfide. Containing about 27% Ni, 60% Fe, 10% S of iron nickel matte, packed together in the air blowing with the report of feeding, make the iron slagging, become contains about Ni78%, S22% lean iron nickel matte. Then use fluidized bed method to calcinate sulfur below 0.005% in rotary kiln. This nickel oxide by ground and add paste plus binder pressing into a 3cm x 2cm cylindrical pad. Use ferrosilicon part reduction method smelting ferronickel, ore in rotary kiln drying, grading, and get rid of Gear actuator low-grade crude block, the composition is approximately: Ni 1.65%, Co Wedge Gate Valve 0.02%, Fe 12%, SiO2 50%, MgO 25%, Cr2O3 1.5%, Al2O3 1.3%, combined water 7%. Dry ore by crushing, screening out less than 0.08mm screen materials, and put in the multilayer roasting furnace for roasting pretreatment. Oversize material is placed in the rotary kiln with gas heating, heating to 700, to remove water and preheating ore. The heating hot material sent to the furnace of the hopper, and then from the material into a bin 14000kV.A opening type furnace, furnace self-baking electrode diameter is about 1000mm, and is equipped with a water cooled furnace wall. Power consumption per ton of ore smelting is about 760kW.h, the electrode consumption is 5kg. Add a strong reducing agent into the mixture of oxidized ore and metal, and mixing the ore, reducing agent and liquid metal. The reducing agent adopts the 50% silicon content ferrosilicon. With ferrosilicon reaction is exothermic, so can prevent the temperature drop down too much when mixed. Every operation can produce 400kg nickel-iron, therefore to load the 4000kg concentrate furnace burden in 2500kV.A furnace. Source: