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Kozhiev H.Н., Klyuev R.V., Bosikov I.I., Youn R.B.

Analysis and identification of the diagonals of mines ventilation networks is based on the decomposition of the ventilation network according to complexity. For calculation of distribution variant of air is used the program constructed by the algorithm of decomposition of a network in a limited volume, which produces a control on the amounts of flows in nodes and returns to the block that changes the option. If all the options are counted then a stop is made. Comparison of the stability calculation results for 186 diagonals from the most characteristic schemes obtained by a simplified procedure and by the developed programs of decomposition of ventilation networks, when solving complete schemes, shows that errors do not exceed 8%. For example, typical schemes of ventilation joints are considered as the most common in the mines of Rostov (Russia) and
Karaganda (Kazakhstan) and representing a complex diagonal connection containing branches.

Number of views: 2443


A. S. VYSKREBENETS, Yu. I. Kondratyev, Z. C. Betrozov, K. B. Dzeranova

One of the most important factors, determining the possibility of the underground and compact leaching intensification by the electric current application on the ore mass is the energy costs reduction. The intensifying action of the reserve direct current with the equal amplitudes and prolongation of the direct and reserve current and the current with the rectangular impulses of the alternative polarity on the metals leaching from ores was studied earlier. One of the possible ways for the further energy costs reduction is the use of the reversible currents with unequal amplitudes and the direct and reverse current duration. The present article deals with the research of such current impact. Using the mathematical experiment planning (Boks-Benken’s triple-level uncompositional plan) 4 experiments series were conducted. At first the rational frequency of the current reverse was determined as 0,21 Hz. The second series investigated intensifying current with unequal amplitudes and impulse duration of the direct and reverse current action, where the impulses frequency or current reverse was also 0.21 Hz. The experiments allowed to determine the current impact parameters when the minimal energy costs are achieved, keeping the high daily extractions of metals into the solution. The obtained results comparison showed that the impulse current use leads to the reduction of the specific energy costs per 7.45 times while the average metals extraction into solution falls per 1.9 times, i.e., the summarized efficiency impact factor makes up 3.90. The action of the reversible direct current with the constant relation of the impulse amplitudes of the direct and reverse current is characterized with the reduction of the specific energy expenditure per 2.11 times, the growth of the average metals extraction into solution per 1.54 times, such impact efficiency per 3.29 times. The ore leaching under the reversible direct current impact with the alternative correlation of impulse amplitudes of the direct and reverse currents is characterized with the following factors: 3,25; 1,12 and 3.66. So it can be concluded that the investigation of the current impact proved the most effective use of the impulse current despite the fact that the metals extraction into solution decreases twice.

Number of views: 2133


Yu.G. Klykov, A.B. Solodenko, A.I. Rakaev, L.V. Soroker

Purpose of this work is the study of the effectiveness of using a centrifugal mill. The authors aim to conduct experiments on regrinding of copper-pyrite middlings of Urupsky Mining and Processing Plant (MPP), to determine its technological parameters and to perform an operational analysis of horizontal centrifugal mill.
Research methods include an experimental study of the process of regrinding middlings of MPP in a centrifugal mill of horizontal type with different sizes of discharge openings and rotor's rotation frequency. The maximum coarseness of source material -0,350 mm.
Research results. The authors have produced studies of the technological parameters and ranked the factors with the use of horizontal centrifugal mill with a rotor diameter of 0.25 m and a frequency of rotation 320 rev/min. The article reveals the etermining factors that affect centrifugal mill: clearance size between the discs, disc rotational speed and bulk density of the source material. The authors have also identified the specific performance in classes -0, 200 mm -0,074 mm.
Conclusions. It was found that the most effective class for grinding has the following parameters: 0,350 mm at a rotor speed of 320 rev/min.

Number of views: 2336


V. V. Pelikh, N. V. Nemchinova, V. M. Salov, V. L. Lapshin

Purpose. The non–ferrous metals deposits development is aimed at thew maximal extraction of valuable products using enrichment methods minimally negatively affecting the extraction territories.
The aim of the tests of tanta –niobium ores processing is to determine the efficiency of the centrifugal separation technology with the continuous discharge and to find the concentrator Knelson installation spot in various scheme types for the given ore type processing. The testing of the concentrator should be estimation concerning Knelson separators use for the deposit ores processing, the test results can be applied for their installation recommendation accounting for the operating technological scheme of ore processing methods. The practical test results for the concentrators use with the variable continuous CVD6 discharge in various technological schemes of tantal–niobium ores processing are presented. The standard Microsoft Excel package was used for the results treatment.
Results. The technological flows control showed that the concentrator CVD6 feeding is characterized with low density (solid content in the pulp). It was found out that the particles coarseness of the processed material was limited with the classification operation on the screen; the over grinding wasn`t observed, the most part of the concentrator feeding was in – 0.2 + 0.07 mm class. The ore particles color was quarts – white with a light yellowish tone (dark color particles and a large amount of mineral joints with quarts were fixed). The amount of coarse particles of the aim product is considerably higher than in feeding.
Conclusions. The increased requirements for the technology and processing of the component complex ore raw material determine new approaches to the concentrators use and variants selection concerning their introduction into the equipment chain schemes. The test results of Knelson CVD6 concentrators for tantalum – niobium ores of one of the Russian deposits prove that the said equipment use increases the extraction into concentrate of coarse, free after grinding particles of the main components (niobium, tantalum). The experiment results allow to reach the granulometric composition of tails for their further processing at the second stage of the centrifugal gravitation.

Number of views: 2358
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ISSN 1998-4502 (Print)                                                            ISSN 2499-975Х (Online)