Recently, chaired by China Nonferrous Metal Industry Association of Beijing Research Institute of Mining's commitment to "the development of ultra-low-grade iron ore utilization technology research" research project conducted conference identification, appraisal committee believes that the project for resource characteristics of China The research proposes "enhanced screening - large crushing than coarse crushing - multi-stage selective dry selection and throwing waste - multiple crushing and less grinding - magnetic separation in stage grinding stage" new process comprehensive utilization technology for the development of ultra-low grade iron is a domestic and international first case, its technical and economic indicators in the world leading level: iron ore concentrate grade of <13% (magnetic iron <6%) increased to 66% iron ore concentrate iron; in dressing up more than 14 Under the conditions, the production cost per ton of concentrate is less than 200 yuan. The ZSG1642 high-efficiency energy-saving vibrating screening feeder has been successfully developed to enhance the screening effect. Increase production capacity by more than 20%. The equipment works normally and the screening effect is remarkable. Compared with the traditional heavy-duty plate feeder, the equipment investment is low and the energy saving effect is good. Reasonably configure the crushing process to increase the coarse crushing ratio. The medium and fine crushing grade is reduced, and the smaller and medium-sized crushing equipment is used, which reduces the equipment investment cost, capital construction cost and running cost. The coarse crushing PD90120 has a remarkable effect on the new external crushing and large crushing ratio equipment. For the first time, the machine is used for the characteristics of iron mines (large processing capacity and continuous operation of equipment), and the mechanism parameters are adjusted on the original basis for improvement. The iron ore coarse crush was successful. Large processing capacity: average daily production capacity of 8000t, up to 9926t; large crushing ratio: material size -850mm, discharge size -150mm; Low energy consumption; the equipment runs 24 hours in a long time, runs smoothly, safe and reliable; convenient operation and maintenance, low noise. Multi-stage selective waste disposal, the first and second sections are selected by magnetic pulleys, and the third section adopts the new fine-grained dry magnetic separator CCXGY-814, which further improves the selected grade, and the dry selection effect is remarkable. After one year of production practice statistics and user-provided economic benefits, the economic and social benefits are significant. The results have been promoted and have a demonstration role in the development of ultra-low grade iron ore with broad application prospects.
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