Angel Zabtchev, Romeo Alexandrov ABSTRACT. A coil intended for magnetisation of finely ground magnetite ores during secondary extraction of iron is considered. It is in the shape of a cylindrical ring and is strung on the pulp tube, which is made of non–magnetic and non–conductive material. The coil has known dimensions of the inner diameter and ...

Yuriy Vilkul, Valeriy Slobodyanyuk, Ivan Мaximov ABSTRACT. When designing the strip mining methods at the deep open pits at the stage of preliminary studies, it is necessary to determine the optimum number and succession of relocation of crushing and transfer stations while developing the open pit. This cuts the transport costs and reduces the number of ...

Svetlin Toshev, Alexandre Loukanov, Saim Emin, Seiichiro Nakabayashi ABSTRACT. The waste electrical and electronic equipment (WEEE) is an important secondary source for renewable extraction of valuable metals and raw materials. The mineral biotechnologies are promising alternative to the current industrial chemical technologies for waste treatment, which are often accompanied with negative environmental impact. Here we report ...

Nadezhda Stoycheva, Petar Shishkov ABSTRACT. Studies of foreign experience in the extraction of magmatic rocks for decorative and cladding purposes show a continuing trend for the use of high–speed explosives in the primary separation of the rock block from the massif. The belief that this is the cheapest way for primary extraction against the background of ...

Nikolay Stoyanov, Stefan Dimovski ABSTRACT. One of the many environmental problems resulting from electricity generation in thermal power plants is the release of large amounts of solid wastes (coal combustion products). In the absence of effective eco–friendly disposal practices, this waste is accumulated in the form of coal ash embankments or in the excavated parts of ...

Serhii Joukov, Serhii Lutsenko, Yulian Hryhoriev, Ehor Shvets, Siarhei Onika, Ekaterina Babiy ABSTRACT. Purpose. The state of open–pit mining, formed at Ukrainian enterprises, as well as the state of the mineral raw materials market require the search for new, more economically feasible approaches to open mining operations. Such a solution is the widespread use of cyclical–streaming ...

Vesela Petrova ABSTRACT. Climate changes and environmental degradation are a threat to the existence of Europe and the world. To overcome these challenges, at the end of 2019, the European Commission outlined as a main political line the proposal for the European Green Deal. In most of its aspects, this document is a benchmark for a ...

Lyubomir S. Ilchev, Nadezhda G. Davcheva–Ilcheva ABSTRACT: Sustainable development helps the transition of industrial enterprises from “open” to “closed” type of economy, solving their contradictions with the environment and the biosphere. Therefore, the future belongs to those industrial plants that will comply with and put into practice the concept of sustainable development. The authors propose a ...

Plamen Georgiev, Marina Nicolova, Maria–Filipa Ivanova, Irena Spasova, Stoyan Groudev ABSTRACT. The study aimed to determine the optimal conditions for adsorption and elution of iron from acid mine drainage by ion–exchange resin LEWATIT MonoPlus TP 207 under a batch regime of operation. Langmuir’s sorption equation was employed to analyse the equilibrium data from the experiments. The ...

N. Duru ABSTRACT. Although the effect of high oxygen pressure on gold recoveries at elevated slurry temperatures was previously investigated, the sole effect of the pressure at ambient temperatures on cyanide leaching with the presence of nearly enough oxygen for the cyanide reactions to occur has not been found to be studied. This research work was ...

Kremena Arsova–Borisova, Veselin Hristov ABSTRACT. The differences between shallow neural networks and deep neural networks are considered. Data from operational exploration of an open pit mine are used to train different types of deep neural networks to predict a useful indicator. The results of deep network training are compared both with each other and with previous ...

Todor Angelov, Ivanka Valchanova ABSTRACT. An initial test work was carried out to demonstrate that solution produced by autoclave acid leaching of Electric Arc Furnace Dust (EAFD) from the steel production could be processed through solvent extraction (SX) to recover zinc. Solvent extraction is a process for purification of the leach solution that extracts mainly zinc ...

Vancho Adjiski, Zoran Panov, Risto Popovski, Radmila Karanakova Stefanovska ABSTRACT. Rock quality designation (RQD) index, provides a general indication of rock mass quality and is widely used in many rock mass classification systems. From the literature review, it is concluded that the RQD methodology has several limitations and one of them is highlighted in this ...

Zaure Abdrakhmanova, Andrey Kan, Roman Yun, Sergey Yefimenko, Dmitry Makarov ABSTRACT. This paper discusses the process and methodological aspects of X–ray fluorescence online monitoring of ore silver grade at the underground mines and open pits operated by Kazakhmys Corporation LLC. The analysis was complicated by the requirement to: a) ensure reliable silver grade determination of ...