Jigger processing ferrochrome scrap recycling and treatment equipment Ferrochrome alloy coarse soot contains large amounts of chromium, silicon, iron, aluminium, magnesium and carbon. While ferrochrome alloy fine soot is rich in silicon, zinc, sodium, potassium, magnesium, sulphur and chlorine. Compared with the coarse soot, its chromium, iron and carbon content is lower. The main phases of ferrochrome alloy coarse soot are chrome spinel, quartz, calcium feldspar and amorphous carbonaceous materials, while fine soot is mainly closely related to the evaporation of substances such as sodium chloride and zinc oxide as well as the high-temperature reduction of oxides such as silica and magnesium oxide. In ferrochrome alloy fine soot also found a small amount of compounds containing water of crystallisation, the study shows that leachable hexavalent chromium is concentrated in ferrochrome alloy fine soot, smelting with open submerged arc furnace, the content of hexavalent chromium in soot is as high as 7000 ppm, which is far more than the content limit of hexavalent chromium in various countries.

　　Jigger processing ferrochrome scrap recycling treatment equipment jigger Many manufacturers and research institutes at home and abroad have studied the use of re-election to recover the metal in ferrochrome alloy slag, such as iMinek in South Africa, Zimasco Chrome Limited in Zimbabwe, HelleniC Ferroalloys in Greece, Bamnilal Ferroalloys Plant in India, and the domestic Jinzhou Ferroalloys Plant and Shanghai Ferroalloys Plant. In the late 1970s, the South African research organisation Mintek started to investigate the recovery of alloys from ferrochrome scrap. Early research confirmed the use of magnetic separation and jigging beneficiation can be recovered from the crushed slag metal products. After more than two decades of research, they have successfully developed a process for the recovery of alloys from scrap (ASF). The process uses crushing and screening methods to divide the slag into four different grain sizes: +25mm, -25+6mm, -6+1mm and -1mm. The -25+6mm particles are block jigged to recover bulk metals and the tailings are ground and returned to the process. Slag blocks with particle sizes greater than 25mm are ground and returned to the process. For particles of -6+1mm, fine-grain jigging is used to separate the smaller metals. A two-stage spiral chute is used to recover metal particles smaller than 1mm. The process has been commercialised by six companies, including Zimbabwe Ferrochrome Company. The metal product contains less than 2 per cent slag, which can be sold directly and recovers more than 96 per cent of the dissociated metal. At Ferro Alloys in Greece, a graded jigging process is used to separate the metal product. Heavy media separation is used for slags of -30+10 mm, jigging is used for particles of -10+3 mm, and shaking tables are used to recover particles smaller than 3 mm. In 2000, the Bamnilal Ferroalloy Plant in India also set up a concentrator to process ferrochrome alloy slag. The plant uses jigging and shaking table to separate the slag from the iron to obtain the alloy. The process involves crushing and screening of the slag into particles of two sizes, -10+1mm and -1mm. Large particles of size -10+1mm are sorted in an AM30 jigger, while particles smaller than 1mm are processed in a shaker. The products are mainly ferroalloys and tailings for direct sale.

The domestic Shanghai Ferroalloy Plant uses jigging to recover chromium concentrate after trying strong magnetic separation, heavy liquid and jigging beneficiation. However, the recovery rate of the process only reaches about 70%, and it cannot recover the metal particles in the slag smaller than 3mm. In addition, Jinzhou Ferroalloy Plant has also used side-acting double bucket diaphragm jigger (LTP34) to recover the alloy in the slag. In the process, the slag should be crushed and screened to a particle size of less than 12mm and then fed into the jigger by electromagnetic vibrating feeder. When the slag particle size is less than 12mm, the thickness of the bedrock layer is +40-60mm and the charging rate is 2.2-3.0t/h, which can make the alloy recovery rate in the slag reach 68.86%, and the chromium content of the recovered metal products reach 61.48%, which is a good effect.

　The role of jigger processing ferrochrome slag recycling treatment equipment China's chrome resources are poor, effective recovery of ferrochrome alloy plant solid waste can produce good environmental and economic benefits. At present, domestic and foreign technology to deal with ferrochrome alloy waste slag mainly has two types of methods: the use of re-election, magnetic separation and other beneficiation methods to recover the metal or chromium concentrate, the tailings can also be used for the production of cement or paving; the use of recycling and recovery of raw materials used in other processes, such as for the production of microcrystalline glass, refractory materials, and for cement blending and paving. For ferrochrome alloy coarse soot can be returned directly to the submerged arc furnace after balling, while fine soot is not suitable for direct recycling, and can be recycled using hydrometallurgical processes to recover zinc or curing/stabilisation processes for the production of cement or clay bricks.