The accumulating capacity of tailing ponds by technology infusion of pulp preliminary clarification in the alluvium charts with its subsequent thickening and storage in the form of a highly concentrated pulp at the bottom of the pond is proposed by authors in the work. For the first time, the time dependence of filling a temporary pond on the ratio of the initial and condensed slurry concentrations for such technologies is obtained. The formula for calculating the degree of condensation is proposed. It provides the parameters selection and justification of equipment for removing water from a temporary pond as the map is filled with the accumulating capacity restoration of tailing ponds. The calculation results for the proposed dependencies allow us to establish: the necessary values of the thickening degree of the hydromixture, the possible intervals of the change in the pulp flow before and after thickening, as well as the volume of water taken from the temporary pond, depending on the concentration of the slurry entering the pond from the alluvium maps, its volumetric flow rate , geometric parameters of the technology for waste storage and the operation duration of a temporary pond.
Purpose. Determination and substantiation of the hydromechanization technologies parameters and the hydraulic transport operation modes for mining the technogenic deposits formed as a result of the enrichment waste storing in tailing dumps of mining and processing enterprises. Methods. A comprehensive multi-stage analytical approach has been used in a paper when performing research. Initially, in order to substantiate the hydromechanization technologies parameters, the parameters of the pulp-preparation unit have been analytically determined in this paper, which are limited by the value of the upper dam edge, taking into account the types of hydraulic mixture. At the second stage, dependences have been set for calculating the critical velocity of hydraulic transporting the pulps with different concentration (low, mean, and high). The next research stage was to determine the head and rate specification (HRS) of the hydrotransport pipeline and the required capacity of the hydraulic mixture, which will enable substantiating the parameters for the corresponding mining complex in the technogenic deposits development. Findings. A critical pipeline diameter has been set with the prescribed parameters of the mining complex and the adopted pulp preparation system. Dependences have been found for calculating the critical velocity of hydraulic transportation of mean-and highly-concentrated pulps. The head and rate specifications have been determined of the tailing hydrotransport pipeline. Originality. For the first time it has been revealed that the critical diameter value is determined by the product of two termsthe first one takes into account the effect of the mining complex productivity, and the secondthe dependence on the pulp preparation system parameters. This makes possible to control the parameters and modes of hydromechanization technologies when mining technogenic deposits formed as a result of storing the enrichment waste in tailing ponds. Practical implications. The "Recommendations for substantiating the parameters of the processes of accumulating capacity restoring of a pond with the use of hydromechanization devices" and "Methods for calculating the parameters for hydraulic transportation of highly-concentrated hydraulic mixtures", have been developed, which may be useful for design organizations and mining-metallurgical enterprises to provide additional volumes of raw material output and increase the tailing ponds lifetime.
The method of determination of parameters of hydrotransport of solid polydisperse materials in vertical pipelines is offered. The reasons of discrepancy between estimated and observed data when using A. Smoldyrev’s method for calculation of hydraulic gradient and critical velocity in vertical steel pipelines are analysed. Particularly non-applicability of Velicanov principle to hydrotransport of solid materials in vertical pipelines is proved and contribution of particles fall velocity to the value of complementary hydraulic gradient in vertical pipelines is estimated. Suggested formulas for calculation of hydraulic gradient and critical velocity in vertical pipelines are multipurpose because they may be used for calculation of hydrotransport parameters in steel and polymeric vertical pipelines with using of friction reducing agents and without it. The method for parameters calculation of solid materials hydrotransport in vertical polymeric pipelines is first offered. Elaborated formulas ensure also increasing of accuracy of calculations.
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