Domnichev M. The technology development for the tailing ponds dust suppressing for the mining and beneficiation enterprises Krivbass.

The subject of research is the processes intended for miners' working conditions safety level improving which face to tailing pond dust at mining enterprises. The aim of the work - to reduce the level of dust escape from the surface of the current tailing ponds and to improve the miners' working conditions at the expense of dust content decrease in the working area air. Research methods: integrated method that contains the analysis of literary sources, theoretical generalization method of disperse systems adhesion and autohesion, aerogas dymamics, physical modeling, and laboratory and industrial researches using the standard practice. Novelty - the following work was done for the first time: - the regularity of dust escape from the tailing pond surfaces depending on moisture content in tails within the working area limits, taking into account the climate peculiarities, was determined; - the mathematical description of dust blowing depending on wind speed and tails' particle size distribution and moisture content, and autohesion forces on the base of two-phase flow method was carried out; - the critical humidity of iron ore dressing tails was defined regarding the early lifting of its particles in the air under the influence of wind that reaches 3,5-4%, and maximum molecular moisture, within 6-6,7%; the influence of natural bischofite solution falling height on the tailing pond dry beaches wetting efficiency and on the deep penetration into the tailings material was specified, with its required height above the surface was over 1 m; the possibility of water solution of natural bischofite usage was proven for all weather dust-fighting measure by means of tailing ponds' surfaces fixing, that allows to maintain them in a damp condition for a long time. Results - the following items had been developed: the technology for the current tailing ponds' surfaces fixing by means of natural bischofite solution that takes into account the physical and mechanical properties of the tails, meteorological conditions, maps' configuration which showed positive results at different weather conditions; "The tailing ponds' dusting surfaces fixing by means of water solution of natural bischofite at OJSC "Northern Mining & Beneficiation complex", approved by OJSC "Northern Mining & Beneficiation complex". The proposed technology of the dust surfaces fixing by means of natural bischofite was tested in the industrial conditions of M&BC of OJSC "ArcelorMittal Kryviy Rih" and OJSC "Northern Mining & Beneficiation complex"; and was accepted into practice that in its turn allowed to decrease considerably the dust content in the air and to improve the working conditions regarding the dust factor not only for tailing ponds' working places, but even for neighboring facilities. Industry - mining.