SEPRM – Volume 1

  • DETECTION AND MONITORING OF MANGANESE IN DRINKING WATER AND GROUNDWATER THROUGH PHOTO-OXIDATION SENSORY REACTION WITH ULTRA- SMALL CARBON NANODOTS
    Svetlin Toshev, Alexandre Loukanov ABSTRACT. The paper focuses on the development of ultra–small carbon nanodots as sensitive sensors for detection and monitoring of manganese in drinking water and groundwater. The environmental contamination with manganese is often a result from industrial activities such as mining and agriculture. The soluble Mn ions are toxic for ...
  • NON-DETONATING CHARGES IN POLYMER HOUSINGS FOR SMOOTH SPLITTING OF ROCK BLOCKS DURING PRIMARY EXTRACTION AND SECONDARY CUTTING
    Nadezhda Stoycheva, Petar Shishkov ABSTRACT. In some cases, during the extraction of certain mineral resources, industrial explosives are not sufficiently safe for the environment in terms of generated shock waves, toxic gases, seismic waves, scattering and vibrations. The main reasons for these harmful effects of the explosion are the speed and the mechanism of the ...
  • CIRCULAR ECONOMY PRACTICES IN THE BULGARIAN RAW MATERIAL INDUSTRY
    Vessela Petrova ABSTRACT. The circular economy, which promotes the responsible and cyclical use of resources, contributing to sustainable development is becoming more and more popular, especially in the European Union. The concept of switching from the traditional linear to cyclical consumption model leads to minimisation of waste and environmental pollution, and in this regard ...
  • TREATMENT OF SULPHATES-RICH SOLUTIONS THROUGH ETTRINGITE PRECIPITATION WITH INDUSTRIAL REAGENTS
    Katerina Nikolova, Svetlana Bratkova, Anatoliy Angelov, Petia Genova, Rosen Ivanov, Ani Stefanova ABSTRACT. Mine wastewaters are often characterised with high concentrations of sulphates, heavy metals and increased electrical conductivity. It is mandatory for the industry to implement convenient treatment methods in order to reduce these parameters. The aluminium precipitation with the simultaneous formation of ettringite was ...
  • EFFECTS OF THE IRON OXIDATION AND PRECIPITATION PROCESSES ON THE ARSENATE SORPTION AND COPRECIPITATION
    Ivelina Moteva, Plamen Georgiev ABSTRACT. The main aim of this study was to assess the effects of ferrous iron oxidation, hydrolysis and precipitation of the ferric iron on the mechanisms of arsenate removal from acid mine drainage. The study was realized at the pH range 2,0 – 6,5. H2O2 was the ...
  • CONTROL OF BLAST-INDUCED SEISMIC ACTION GENERATED BY TECHNOLOGICAL BLASTINGS
    Zdravka Mollova, Vladimir Penev ABSTRACT. This article presents some of the studies on drilling and blasting technologies applied in the Assarel copper mine. The main emphasis is on examining the seismic effects on a particular engineering facility, located on the territory of the mine – CPT–3. The assessment of the blast– induced seismic loading on ...
  • STUDY OF THE RELATIVE ENERGY CONSUMPTION OF A DRUM MILL TYPE SAG 8.5 X 5.3
    Ivan Minin, Petko Nedyalkov, Simeon Savov, Teodora Hristova ABSTRACT. The article discusses the topic of the specific power consumption of a drum mill type SAG 8.5×5.3. The purpose of the study is to determine the influence of some basic parameters like angular velocity of the mill drum, the wear on the drum’s lining, mass of the ...
  • PROCESSING OF PYRITE CONCENTRATES WITH THE EXTRACTION OF NON- FERROUS METALS: NICKEL AND COBALT TECHNOLOGY ELABORATION
    V. A. Luganov, T. A. Chepushtanova, G. D. Guseynova, Y. S. Merkibayev, K. K. Mamyrbaeva, B. Mishra ABSTRACT. The paper presents the results of the development of a technology for processing of pyrite concentrates with the extraction of non–ferrous metals, iron and sulphur using the technology of two–stage dissociating roasting with hydrometallurgical processing of cinder. ...
  • JET FANS EFFICIENCY IN TUNNEL EMERGENCY SITUATIONS
    Nadezhda Kostadinova ABSTRACT. Tunnel construction has become an important and growing activity. Tunnelling is an important part of transport infrastructure and is a part of the sustainable development of the country. The tunnel ventilation during construction and operation is part of the whole design procedure. Although ventilation might be performed with different approaches, longitudinal ventilation with ...
  • RATIONALISING THE LOCATION AND DESIGN OF THE WASTE DUMP IN THE CASE OF OPEN-PIT MINING
    Dimitar Kaykov, Ivaylo Koprev ABSTRACT. The location for dumping the waste from the open–pit mine has a significant weight for the establishment of the waste treatment costs. According to the constructive parameters of the waste dump and the terrain’s characteristics, the volume of the affected area is determined, in relation to the waste volume generated from ...
  • LABORATORY MODEL OF A MAGNETIC LEVITATION SYSTEM
    Yassen Gorbounov, Petar Peychinov ABSTRACT. The magnetic levitation consists of balancing the forces of attraction and repulsion of a ferromagnetic object located in a foreign magnetic field in such a way as to keep a desired distance between the object and the magnet. This technology is receiving increasing attention because it helps to eliminate ...
  • REVIEW OF THE IRON RECOVERY PROCESSES FROM LADEN LEACH LIQUORS IN HYDROMETALLURGY
    Plamen Georgiev, Maria–Filipa Ivanova, Marina Nicolova, Irena Spasova, Stoyan Groudev ABSTRACT. Iron is usually present in higher concentrations in the laden solutions and its removal and elimination to a stable phase is a severe problem in hydrometallurgy. This article analyses and compares the processes of solvent extraction and ion exchange as methods for the iron ...
  • SEISMIC EXPLORATIONS FOR DEFINING THE DAMAGE TO THE EARTH DAM PISHICA IN THE REPUBLIC OF NORTH MACEDONIA
    Blagica Doneva, Marjan Delipetrev, Gorgi Dimov ABSTRACT. The reservoir was built in the middle of the 20th century with a total capacity of 750,000 m3. The height of the dam from the river terrace is 22 m, the length of the crown is 319 m, and the width of the crown is ...
  • EFFICIENCY OF MICROBIAL FUEL CELLS BASED ON THE SULPHATE-REDUCTION BY ETHANOL
    Svetlana Bratkova, Zlatka Alexieva, Anatoliy Angelov, Katerina Nikolova, Petia Genova, Rosen Ivanov, Maria Gerginova, Nadejda Peneva ABSTRACT. The influence of hydraulic retention time (HRT) on the rate of sulphate–reduction and electricity generation of microbial fuel cell fed with ethanol was studied. The experiments were performed in the laboratory installation, consisting of an ...
  • MAGNESITE BENEFIATION METHODS: A REVIEW
    Georgios-Michail Bimpilas, Georgios N. Anastassakis ABSTRACT. Magnesite is one of the most important mineral commodities mostly because of its technological and industrial applications. The most important commercial sources for its recovery are the corresponding ores. The deposits are characterised by the differences in reference to magnesite mineral crystallinity and gangue composition. For these reasons, the separation ...
  • OPEN-PIT TIME SCALE OPTIMISATION IN A TRUCK SCHEDULING PROBLEM
    Simeon Asenovski, Dimitar Kaikov ABSTRACT. In the present economic situation, the open–pit mining processes require flexible solutions for achieving the set goals. The aim of the study is to consider a comprehensive mathematical model for a short and long term open–pit mine optimisation in a truck scheduling problem. The model can be applied in different situations ...
  • Internet of Things in the mining industry – security technologies in their application
    Yordanka Anastasova ABSTRACT. The Internet of Things are essentially huge networks of connected devices that collect and share data (information) both for specific processes and their application environment. The use of the Internet of Things (IoT) is changing every industry because it allows device-to-device communication and automates the maintenance, communication, and interaction between processes and their ...