Research into the crushing and grinding processes of iron ore with its simultaneous effect by mechanical load and electric field of ultra-high frequency

Shcherbakov, Petro; Tymchenko, Svitlana; Buhrym, Olha; Klymenko, D. V.

doi:10.1051/e3sconf/201912301030

Cited by 8 publications

(13 citation statements)

References 3 publications

(2 reference statements)

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“…According to [1]- [5], [11], [12], [16] and [17] studies, efficiency of roller-bit drilling rig, being common for open pits, is determined as follows:…”

Section: Methodsmentioning

confidence: 99%

“…For the purpose, it was proposed to abstract from the nature of physical process of rock mass blasting to a model, evaluating its performance indicators. Standard deviations of such three performance indicators as fragmentation degree, shotpile width, and safe distance have been selected [11], [12].…”

Section: Figure 1 Graphic Representation Of the Independence Of The Reduced Cost For Hard Rock Mining Upon Specific E Consumption And Avementioning

confidence: 99%

“…It concerned different sizes of rocks as well as their hardness. In this, fragmentation quality of the rock mass during blasting was evaluated objectively using a purposely designed automation [12], [21] and [22]. Moreover, similar studies were carried out under laboratory conditions using simulation of stage one of hard rock crushing.…”

Section: Sh T Fl Gtmentioning

confidence: 99%

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Mathematical model to optimize drilling-and-blasting operations in the process of open-pit hard rock mining

Shcherbakov¹,

Tymchenko²,

Bitimbayev³

et al. 2021

Min. miner. depos.

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Purpose is to determine a function of the reduced expenditures connected with drilling-and-blasting operations, loading and hauling operations, and rock fragmentation depending upon the cost of machine-shift of the applied facility, its operation modes, hardness of rock being blasted, cost of the used explosive, and rock fragmentation quality based upon the developed optimization mathematical model. Methods. Method of statistical evaluation of natural blockiness structure of the rock as well as quality of its fragmentation by means of explosive energy has been applied. Statistical studies have been carried out concerning the basic indices of rock fragmentation depending upon its largeness and block hardness. Purposely-designed experimental equipment has been applied for sampling analysis of the rock fracturing in the process of its drilling by means of rotary drilling rig. The abovementioned supported representativeness of the sampling. Findings. Statistical distributions of the rock blockiness structure in terms of each bar length involving its place within the drilling assembly as well as in terms of the well depth have been compiled. Visual comparison of experimental data and theoretical data has helped determine that the statistical distributions of natural blockiness structure of the rock have the closest correlation with gamma distribution which differential function has two positive parameters. Statistical dependence has been defined between drilling-and-blasting results and the total expenditures connected with hard rock mining. Originality. A concept of oversize crushing coefficient has been introduced; its statistical dependence upon the mined rock hardness and specific consumption of the applied explosive has been derived. An alternative has been proposed concerning changes in parameters of the differential function of the assumed gamma distribution relative to the predicted granulometric composition of rock mass. Practical implications. Economic and mathematical model has been developed involving a target function of the total expenditures connected with the listed operations as well as a set of constraints avoiding incorrect decisions. The optimization method makes it possible to control drilling-and-blasting parameters at each stage of hard rock mining.

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“…According to [1]- [5], [11], [12], [16] and [17] studies, efficiency of roller-bit drilling rig, being common for open pits, is determined as follows:…”

Section: Methodsmentioning

confidence: 99%

Section: Figure 1 Graphic Representation Of the Independence Of The Reduced Cost For Hard Rock Mining Upon Specific E Consumption And Avementioning

confidence: 99%

See 1 more Smart Citation

Mathematical model to optimize drilling-and-blasting operations in the process of open-pit hard rock mining

Shcherbakov¹,

Tymchenko²,

Bitimbayev³

et al. 2021

Min. miner. depos.

Self Cite

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“…Underground leaching of uranium is carried out by selective its dissolution with chemical reagents from ores at the place of their occurrence and subsequent extraction from uranium-containing solutions. Despite all the advantages, when using a borehole in-situ leaching of uranium, there is still a number of unresolved problems, one of which is to prolong the interrepair cycle of production wells performance, as well as to increase the ratio of uranium recovery (Zabel'skiy, 1981;Golik & Kultyshev, 2011;Yusupov, Elzhanov, Aliev, & Dzhakupov, 2017;Shcherbakov, Tymchenko, Buhrym, & Klymenko, 2019).…”

Section: Introductionmentioning

confidence: 99%

Study of change in the leaching solution activity after treatment with a cavitator

Aben¹,

Markenbayev²,

Khairullaev³

et al. 2019

Min. miner. depos.

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Increasing the valuable component content in a pregnant solution due to the activation of leaching solution with cavitation treatment in case of the borehole in-situ leaching (ISL). Methods.To obtain the cavitation effect, a laboratory cavitation plant has been produced. Studies on the sulphuric acid solution activation by means of cavitation were conducted using solutions with 10 g/l of acid content. Studies of changing the sulphuric acid solution activity during treatment with a cavitator were conducted for 3 minutes (24 passes through the cavitator), 5 minutes (40 passes), 10 minutes (80 passes) and 20 minutes (160 passes). The content in the solution of the valuable component was analysed using a KFK-3-"ZOMS" photoelectric photometer.Findings. The laboratory studies have been performed to set the influence of the cavitation process on the leaching solution activity at various degrees of activation and time of reaction. The studies have established that in order to activate the leaching solution, it is proposed to carry out cavitation treatment of sulphuric acid before to additionally fortify the mother solution, which helps to increase its activity. The solution activation leads to an increase in the valuable component content from 18 to 26% in the pregnant solution and its activity is maintained for a long time (up to 30 days).Originality. New dependences have been obtained reflecting the nature of changing the valuable component content in the pregnant solution on the reaction time and the degree of solution activation. Practical implications.The proposed activation method leads to an increase in the valuable component content in the pregnant solution compared to the basic technology, therewith, the activity is maintained for a long time. The proposed technology is characterized by low capital costs, is easily integrated into the existing system and is absolutely environmentally friendly.

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“…According to a form of relative frequency histogram (Fig. 1), it is possible to hypothesize about the exponential rule of the value distribution [18] being de scribed by the differential function (density)…”

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confidence: 99%

Predictability of a small-amplitude disturbance of coal seams in Western Donbas

Prykhodchenko¹,

Shashenko²,

Sdvyzhkova³

et al. 2020

Nauk. visn. nat. hirn. univ.

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preDIctABIlIty of A sMAll-AMplItuDe DIsturBAnce of coAl seAMs In western DonBAs purpose. To identify development regularities of a smallamplitude disturbance in terms of typical Western Donbas mine fields and to define the most efficient tendencies of its prediction. Methodology. The methods include analysis, systematization, generalization, and statistical processing of geological and geo physical data; probability analysis. findings. Such parameters of smallamplitude breakings as amplitudes, slope angles, and length of the disturbances have been geometrized within the fields of Stepova and Yuvileina mines of Pershotravenske Mine Office (MO). The abovementioned helped to develop the statistical distribution of the values. Zonality of the smallamplitude disturbances of coal seams has been determined for the fields of the mines. Parameters of the zones are continuous, which made it possible to extrapolate them to the undisturbed shares of the mine fields. Statistical processing of the data, concerning characteristics of smallamplitude disturbances, became a basis for hypothesizing on the theoretical probabilistic distribution of the values, which helped to predict probable amplitude and length of disturbances within the undisturbed shares of the mine fields. Log data of expendable wells were used to support the prediction re sults. Caliper logging, showing tectonic disturbances, has been defined as the most informative log index in the context of geological conditions of Yuvileina mine. The log data confirm the prediction with the use of the disturbed area extrapolation. originality. It has been proved that the smallamplitude disturbances within mine fields of Pershotravenske MO form persistent areas demonstrated steadily in the log data. Among other things, logging is the most informative log index demonstrating tectonic disturbances for the geological conditions of Yuvileina mine. Such geometrical parameters of the disturbances as amplitude and length are subject to the exponential rule of the probability distribution, making it possible to predict the most possible values of the amounts where new stopes are planned for operation. The information concerning disturbance parameters of a coal seam helps to predict the complexity of mining of certain sites of a mine field. practical value. It has been identified that in terms of the fields of Pershotravenske MO, efficient prediction of smallamplitude disturbance of coal seams should involve the integration of geological (zone extrapolation) and geophysical (logging) methods. The analysis of log data of exploration wells within the areas where extrapolation recorded the highest probability of the small amplitude disturbance formation provides the early decisions as for the efficiency of the site mining to develop the required engi neering solutions, and to predict the coal grade deterioration.

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Research into the crushing and grinding processes of iron ore with its simultaneous effect by mechanical load and electric field of ultra-high frequency

Cited by 8 publications

References 3 publications

Mathematical model to optimize drilling-and-blasting operations in the process of open-pit hard rock mining

Mathematical model to optimize drilling-and-blasting operations in the process of open-pit hard rock mining

Study of change in the leaching solution activity after treatment with a cavitator

Predictability of a small-amplitude disturbance of coal seams in Western Donbas

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