Ammosov North-Eastern Federal University, Mirny, Russia

N. P. Ovchinnikov, Director of the Mining Institute, Candidate of Engineering Sciences, ovchinnlar1986@mail.ru
I. V. Zyryanov, Head of Department, Professor, Doctor of Engineering Sciences

The centrifugal multistage sectional pumps used in water drainage are put under full repair untimely in many mines. At ALROSA the low operating efficiency of the pumping equipment is explained by the fact that mine waters have physicochemical compositions off the standards imposed on liquids to be pumped. First of all, this relates to the solid concentration in mine water, which is a major cause of wear of parts in flow cells of mine pumps. As practice shows, both water influx and content of solid phase in mine water can vary with the increasing production of a mine or (and) with the growing depth of mining. Accordingly, the estimate of an overhaul time of a pump needs an index of solid particles pumped together with mine water. It is proposed to calculate the optimum full repair frequency of mine pumps using their minimum operating capacity. The calculation procedure was tested as a case-study of pumping equipment of the main water-removal plant at Udachny Mine, with the certified capacity of 350 m³/h. It is found that the increase of the minimum operating capacity of the main water-removal pump at Udachny Mine from 200 to 220 m³/h can reduce the mine water pumping expenses by 2,7 Rub/m³. The main water-removal plant modernization at Udachny Mine, with the decrease in the average concentration of solid particles in mine water at outlets from water collectors from 17 to 4 g/l can enable increasing the minimum operating capacity of the test pump from 220 to 250 m³/h. With the higher quality of mine water clarification, the minimum operating capacity of the pump will also escalate.

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