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在中部采选公司,年处理80万t弱磁性铁矿石的磁选系统已投产。该公司的焙烧磁选厂自1962年开始处理这种铁矿石。矿石在30座直径为3.6m、长度为50m的回转窑中处理,在850～900℃温度下实现还原焙烧。回转窑利用天然气(甲烷)加热,采用天然气和褐煤作还原剂。焙烧矿石在磁场强度为80～100kA/m的筒式磁选机的系统中按磁铁矿选矿工艺进行选别。近几年来,选矿厂的矿石处理量已达900～950万t,精矿品位为64％～64.5％。由于天然气耗量大和空气污染,1989年焙烧窑就停止使用了,而选矿系统则由焙烧磁选改为单一磁选。最早的一个系统已在1988年12月投产。
In the middle of mining companies, processing 800000 t weak magnetic iron ore magnetic separation system has been put into operation. The company’s roasting and magnetic separation plant has been handling such iron ore since 1962. The ore is processed in 30 rotary kilns with a diameter of 3.6 m and a length of 50 m, and the reduction roasting is carried out at a temperature of 850-900 ° C. Rotary kilns use natural gas (methane) heating, using natural gas and lignite as a reducing agent. Calcined ore in the magnetic field strength of 80 ~ 100kA / m cylinder magnetic separator system by magnetite beneficiation process sorting. In recent years, the beneficiation plant ore handling capacity has reached 900 ~ 9.5 million t, concentrate grade 64% ~ 64.5%. Due to high natural gas consumption and air pollution, the roasting kiln was discontinued in 1989 and the ore dressing system was changed from roasting to single magnetic separation. The first system was put into operation in December 1988.