Modeling the formation of high metal concentration zones in man-made deposits

Malanchuk, Zinovii; Корнієнко, В. І.; Malanchuk, Ye; Soroka, V.I.; Vasylchuk, Oleksandr

doi:10.15407/mining12.02.076

Cited by 28 publications

(25 citation statements)

References 14 publications

(14 reference statements)

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“…For the stationary flow-over of the broken tuff-stone along the extraction chamber bottom, the following theoretical model is the most sufficient, which is developed for the stationary flow [49]. If the flow-over parameters at the beginning of the generatrix of the extraction chamber bottom are stationary, then a stationary flow is realized on the conical surface, which satisfies the system of equations:…”

Section: Resultsmentioning

confidence: 99%

Modelling hydraulic mixture movement along the extraction chamber bottom in case of hydraulic washout of the tuff-stone

et al. 2020

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This paper presents the research results of the pulp movement process along the extraction chamber bottom to the suction pipe of the pulp lifting device in case of downhole hydraulic mining the volcanic tuff-stone. The washout process and hydraulically operated transportation of the tuff-stone hydraulic mixture, when forming the extraction chamber, have been studied under various conditions and methods of exposure. As a result, the dominant parameters have been determined influencing the hydrodynamic washout technology as well as tuff-stone hydraulic mixture lifting to the alluviation map. The dependences have been substantiated of the washout process performance and transportation capacity of the hydraulic mixture flow on the determined parameters. To calculate the process of pulp flow-over along the extraction chamber bottom to the intaking hydraulic elevator headwall, the systems of equations have been determined based on the modelling the movement of tuff-stone hydraulic mixture along the extraction chamber bottom during hydraulic washout. The dependences of the contact strength of the tuff-stone samples mined by downhole method on the time spent in water are presented, resulting in determination of the tuff-stone weakening coefficient and the degree of its saturation with water.

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Section: Resultsmentioning

confidence: 99%

Modelling hydraulic mixture movement along the extraction chamber bottom in case of hydraulic washout of the tuff-stone

et al. 2020

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“…Using [26] studies, demonstrate the key results of solving a problem of amber particle motion within the amber-bearing medium also determining the particle velocity, and hydromechanical effect. The amber-bearing medium is thencomponent granular mixture; space between its particles may be filled with liquid or gas.…”

Section: Methodsmentioning

confidence: 99%

Substantiating velocity of amber buoying to the surface of sludge-like rock mass

Корнієнко¹,

Nadutyi²,

Malanchuk³

et al. 2020

Min. miner. depos.

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Purpose is to substantiate the parameters and factors in terms of which amber can be mined efficiently from sand deposits using hydromechanical method. Methods. Laboratory studies and full-scale experiments of amber-bearing sand with 2-50 mm fractions were carried out to substantiate velocity of amber buoying up to the sludge surface. Amber from Klessiv and Volodymyrets deposits were involved. Computer research relied upon Curve Fitting of the software environment Matlab. Analysis of amber particles, buoying up to the surface, relied upon a theory of particle motion within the sand formation, characterizing by motion with resistance of a dry friction type. Methods of mathematical statistics were applied; then dependences were plotted describing the effect of mining parameters on the amber buoying up velocity. Findings. The basic parameters of hydromechanical method and parameters, effecting buoying up velocity, and dependence of dimensions as well as weight of the amber fractions have been identified. Dependences of the dominant factor effect on the process of amber buoying up to the surface of sludge-like rock mass have been determined to improve the efficiency of amber mining.Originality. Maximum period of the analyzed amber fractions, differing in their diameters, is not longer than 4 minutes.The results of the experimental data as well as computer-based experimental data have helped define that 3 rd order polynom with corresponding rational coefficients for various amber fractions, occurring in the sand amber-bearing deposits, is the most adequate to describe the research. It has also been defined that velocity of amber buoying up from amber-bearing sand medium depends upon effect on the process of the dominant factors; and geometry of amber fractions and their weight making it possible to apply a hydromechanical mining method. Practical implications. The obtained regularities of hydromechanical mining of sand amber deposits help calculate and select facilities for hydromechanical mining of amber.

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“…Since the layer is thin, then consideration of an impulse equation, particle acceleration along the normal down to the flow bottom can be neglected as well as changes in a body force along the layer thickness [21,22].…”

Section: →0mentioning

confidence: 99%

Substantiating parameters of zeolite-smectite puff-stone washout and migration within an extraction chamber

Malanchuk¹,

Moshynskyi²,

Korniienko³

et al. 2019

NVNGU

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SToNe wAShouT AND miGrATioN wiThiN AN exTrAcTioN chAmber Purpose. To substantiate parameters of zeolitesmectite puffstone deposit hydromining method while analyzing dependences between physicotechnological indices of hydromining equipment and rock mass characteristics, which will help optimize the extraction technique. methodology. Complex research approach (i.e. field observations, laboratory tests, and bench testing) is the methodological basis to solve the problem. The approach involves system analysis, physical modeling of hydrodynamic processes, and outcome analysis using MаtLаb mathematical software package. findings. Dependences of zeolitesmectite puffstone failure upon a mouthpiece diameter, water pressure, washout radius, and gravity streaming hydraulic transportation within an extraction chamber have been determined. Effect of kinetic energy of a falling slurry stream on the decrease in the specific power consumption in the process of rock transportation over an extraction chamber floor has been identified. Power consumption dependence upon hydraulic monitor dimensions and working agent pressure is of quadratic nature: the increased pressure of a working agent in front of a mouthpiece, power consumption of the washout increases, and specific water consumption drops. originality. For the first time, an approach to describe zeolitesmectite puffstone failure taking into consideration hydrody namic puffstone washout, hydraulic mixture migration within an extraction chamber, and transportation of the mineral has been applied. Relying upon power consumption to washout hydraulic mixture and transport it within a washout chamber, both linear nature and directlyproportional dependence of transport capacity upon hydraulic monitor loss and chamber floor slope has been determined. Power consumption dependence has been defined for different types of mouthpieces and working agent pressure in order to avoid cuts and layerbylayer washout of a mineral. Practical value. The obtained results can be applied to improve dominating parameters influencing the hydrodynamic process for zeolitesmectite puffstone washout. For the purpose, rational efficiency of puffstone failure has been identified as well as ro tational angle of a lateral mouthpiece of a jet head at 15-20 m height in terms of layerbylayer washout with rock migration over a distance being equal to a half of the washout diameter. Real conditions (for zeolitesmectite puffstones) have been determined under which minor jet velocity variation from the determined parameters results in a cut or in a fall of the washout chamber.

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Modeling the formation of high metal concentration zones in man-made deposits

Cited by 28 publications

References 14 publications

Modelling hydraulic mixture movement along the extraction chamber bottom in case of hydraulic washout of the tuff-stone

Modelling hydraulic mixture movement along the extraction chamber bottom in case of hydraulic washout of the tuff-stone

Substantiating velocity of amber buoying to the surface of sludge-like rock mass

Substantiating parameters of zeolite-smectite puff-stone washout and migration within an extraction chamber

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Modeling the formation of high metal concentration zones in man-made deposits

Cited by 28 publications

References 14 publications

Modelling hydraulic mixture movement along the extraction chamber bottom in case of hydraulic washout of the tuff-stone

Modelling hydraulic mixture movement along the extraction chamber bottom in case of hydraulic washout of the tuff-stone

Substantiating velocity of amber buoying to the surface of sludge-like rock mass

Substantiating parameters of ­zeolite-smectite puff-stone washout and migration within an extraction chamber

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Substantiating parameters of zeolite-smectite puff-stone washout and migration within an extraction chamber