Kryvyi Rih National University, Kryvyi Rih, Ukraine:

T. A. Oleynik, Head of a Chair, Doctor of Engineering Sciences, Professor
V. I. Mulyavko, Professor, Doctor of Engineering Sciences

Ukranian Research and Design Institute for Industrial Technology, Zhovti Vody, Ukraine:
V. I. Lyashenko, Senior Researcher, Candidate of Engineering Sciences, vi_lyashenko@mail.ru

The authors describe the main theoretical and practical results obtained after development and introduction of new technologies and equipment designed for dry dust catching during processing of iron ore with a view to enhancing the ore concentration efficiency, improving the environmental and working conditions and reducing the useful component loss. The outcome of the engineering and introduction of the new-generation equipment is reported. The increase in the rate of dust catching using the new equipment is theoretically proved, the influence of electric charges on the dust filter performance is examined, and the data of lab tests on a cyclonic machine are presented. The use of the developed equipment at production plants will allow decrease in the air dust content down to a safe level and will cut down the dust catching expenses owing to utilization of dust caught and separated with respect to physical properties. The rate of fine dust catching has increased by 60% in the mentioned equipment. Dynamic magnetic field catches magnetic dust with an efficiency to 95% and separates it into magnetic (iron content to 65%) and nonmagnetic (Fe content to 12%) components at the initial content of total iron to 33%. It is planned to fit the magnetic systems of the separators with the constant magnets of the type Nd–Fe–В or Dy–Fe–B made with the use of lanthanide series elements (neodymium or dysprosium) having the surface flux density of 0.6–0.76 Tesla, which exceeds the field density of ferrum–barium components by an order of magnitude. The proposed equipment even enables efficient separation of weakly magnetic materials, which allows transition to the ecology-friendly processing of finely ground ore and to the low-waste production.

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