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Упит dcterms_subject_txt:variability of coal quality

2636 items

  • The Content of Toxic Metals in Agricultural Produce near a Coal Mine: Case Study KCB in Lazarevac, Serbia

    Ana Koprivica, Čedomir Beljić, Boris Vakanjac, Vesna Ristić Vakanjac, Marina Čokorilo Ilić (2018)
    Праћење и анализа концентрација токсичних метала (олово и кадмијум) у земљишту и усевима указују на то да пољопривредно земљиште у Србији углавном није загађено, а квалитет земљишта је природно добар. Због тога су таква земљишта погодна за органску пољопривреду. Сви уочени случајеви контаминације токсичним металима су само локалне природе, а резултат су ђубрива и пестицида, комуналног отпада, издувних гасова, оближњих производних објеката, топионица, рудника, јаловишта итд. Локације овог типа морају бити редовно прати и процењује статус земљишта и усева. ...
    токсични метали, олово, кадмијум, земљиште, усеви, одрживи развој

  • An Approach to Management Decision Support: The Coal Mine Pljevlja Management Information System

    Božo Kolonja, Ranka Stanković, Filip Vuković, Ivan Obradović (2006)
    In this paper we describe the approach that has been used in the development of the Management Information System (MIS) in the Coal Mine Pljevlja in Montenegro. The methodology of this approach was based on new information technologies and management techniques which have already been successfully applied in other related fields. Its main goal was to introduce modern management techniques to mining, adapted to specific features of the mining industry, its operations and environment, thus enabling the tactical management ...
    ... The following types of information are considered: produced quantities of coal per assortments, realized efficiency of equipment, realized wages, production standstills, breakdowns, operative events, condition of equipment and facilities, condition of dumps, quality of coal and waste water, shift ...
    ... about all types of operative events that influence production, drilling-blasting works, condition of equipment and facilities, condition of dumps, quality of coal and waste water, shift reports, etc. Figure 4 presents the form with parameters for report generation and the preview of the report. Reporting ...
    ... methodology has already been applied in the development of the first phase of the Coal Mine Pljevlja MIS aimed at monitoring and management of transportation costs, in the summer of 2005. It resulted in the establishment of an efficient system of information, thus motivating the mining management, ...

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... composition and quality of coal for each specific coal basin, – dependencies between the chemical, mineral and physical properties make a good basis for predicting and solving- specific technological and ecological problems related to the use of ash and slag, – using different types of coal from Kolubara ...
    ... is composed of the following chemi- cal components: SiO2, Al2O3, Fe2O3, CaO, MgO, SO3, S, Na2O and K2O. Results of laboratory tests show that fly ash and slag have variable chemical, mineralogical and physical properties that are dependent on the natural composition, quality of coal from basin, the ...
    ... (1973): Methods of analysis of coal and coke – Determination of ferric oxide (Fe2O3) in ash from solid fuels. SRPS B.H8.363 (1973): Methods of analysis of coal and coke – Determination of tita- nium oxide (TiO2) in ash from solid fuels. SRPS B.H8.364 (1973): Methods of analysis of coal and coke- Det ...

  • Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry

    Steven Manders, Milorad Pantelić, Vladimir Milisavljević, Alberto Martinetti (2021)
    Self-engineering is a relatively new branch of knowledge that aims to understand how systems could “autonomously” re-configure or repair themselves without the intervention of the operators. A direct field of application is within the maintenance spectrum. Having systems or machines capable of self-detecting or even self-repairing could represent a game-changer, in capital asset fields such as the mining industry in particular. This paper aims to investigate the possible benefits and challenges of self-engineering / self-maintenance concerning mining machines, specifically bucket-wheel ...
    self-engineering, self-maintenance, maintenance operations, mining industry, bucket-wheel excavator, gearbox revitalization

  • A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić (2023)
    This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...
    системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFIS

  • Evaluation And Perspectives Of Underground Coal Mines In Serbia

    Vladimir Milisavljević, Milena Lekić, Ivica Ristović, Vojin Čokorilo, Aleksandar Cvjetić (2017)
    ... thickness, floor and roof conditions, block size, coal clearance facilities and supply facilities (criteria C4); • Quality of coal and products, such as coal type, sulphur content, ash content, moisture content, calorific value and amount of fines (criteria C5); • Market and delivery possibilities ...
    ... various types of coal, as given in Table 1. Table 1. Mines, location, type of coal produced and number of workers (as of March, 2017) Mine Town / Municipality Type of coal Number of workers Vrška Čuka Vrška Čuka, Zaječar Anthracite 145 Ibarski rudnici Baljevac, Raška Hard coal 479 REMBAS Resavica ...
    ... Introduction Serbia is one of the major coal producers in Europe, with over 38 Mt of coal per year. But most of this production is achieved in lignite open cast mines, which in 2016 produced 37.6 million tonnes [1]. On the other hand, combined production of all underground coal mines in Public Company ...

  • Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine

    Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)
    The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...
    Fuzzy theory, hydraulic excavator, selection, quality of service, asset management

  • Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays

    Vladimir Simić, Dragana Životić, Zoran Miladinović (2021)
    Management, Monitoring, Policy and Law,Nature and Landscape Conservation
    ... those are re- serves of A + B + C1 categories), but continuous exploitation of bentonite in Serbia never existed. The main problems of valorisation of most bentonite deposits are relatively small deposits with layers of bentonite of small thickness, mostly medium or poor quality of raw materials, and ...
    ... evaluation of both the current exploration methodol- ogy and the achieved results. Table 3. Perspective deposits of bentonite and bentonite clays in Serbia [53]. Size of deposit after [44]. None of these deposits are in operation. Deposit Size of Deposit Quality (Grade) Method of Exploitation ...
    ... nor the minimum number of re- quired tests. We have proven that much more attention should be focused on the complex study of industrial clays on the one hand (origin of certain industrial types of clays, their quality, and possibilities of application) and improvement of exploration process, exploi- ...

  • Production information system of the Pljevlja coal mine

    Božo Kolonja, Ranka Stanković, Filip Vuković (2018)

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... exhaustion of coal resources. However, the weak point of coal utilization in Serbia is the efficiency of energy con- version. Efficiency for electricity generation from coal is about 34%, which is below the aver- age efficiency of modern thermal power plants in Europe. With additional 83.5% of electricity ...
    ... considers resources of coal and aggregated resources of oil and natural gas. 2(C) Estimated coal resourcesSS 689 years Coal consumption per year = = (9) 2(O+NG) Estimated oil and NG resourcesSS 29.6 years Oil and NG consumption per year = = (10) Except in the case of coal, it is evident that ...
    ... the other words, pillars of availability of energy in Serbia, and its energy security are indigenous energy production and use of fossil fuels, primarily coal, and renewables – hydro and biomass. Table 6. Results of individual significance of components Components of availability SOS SS D RES ...

  • Mineral Resources of Serbia: Environmental, Societal and Economic Challenges

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... resources of the industrial minerals of Serbia are presented in Table 3. Coal Potential Lignite makes up almost 90% of energy resources of the country, while oil and gas account for less than 10%. Serbia has access to insufficient reserves of coal, consisting primarily of low quality lignite ...
    ... reserves and a more thorough analysis of their quality. It is also necessary to carry out detailed geochemical analyses of the coal, coal ashes and flying ashes in order to forecast and estimate the harmful and potentially toxic elements. Only a comparatively small part of the complex geological explorations ...
    ... Degree in July 2001 on successful completition of MA thesis “Petrography and quality of coal from the Kostolac basin and its energetic potential.” She defended her PhD thesis entitled “Petrographic and organic geochemical characteristic of brown coal in the deposite from Eastern Serbia” in November ...

  • Application of VIКOR method in the selection of an optimal splution of excavation “Borska Reka” ore deposit

    Sanja Bajić, Dragoljub Bajić, Branko Glušćević, Radmila Gaćina (2023)

  • Heavy metals in lignite and soil of Kostolac-Kovin coal basin, eastern Serbia - comparative analysis with selected cities in Serbia, region, Europe and world

    Bogoljub Vučković, Bojan Dimitrijević (2023)
    The Kostolac-Kovin coal basin with an area of 320 km2, with 5 separate layers of coal and with a total of about 5.7 Bt of geological resources and reserves represents an exceptional potential for coal production in Serbia. The coal resources listed in this way are not fully exploitable, but they represent potential for consideration. In this paper, we deal with the geochemical characteristics of coal seams and perform a comparative analysis of coal affectation on the environment. With ...
    lignite, heavy metals, concentrations
    ... exploration fields. The general calculation of coal resources for all 5 coal seams yielded about 5.75 B t of coal. 2. GEOCHEMISTRY OF LIGNITE, ACCOMPANYING SEDIMENTS AND SOIL IN THE BASIN AREA Numerous analyzes were taken to determine the quality of lignite, as well as numerous others for g ...
    ... d) Figure 3. General view of the spatial distribution of 5 separate coal seams in the Kostolac-Kovin coal bearing basin – a) I (red dots) and I (pink dots) coal seams; b) II (black dots) coal layer; c) la coal layer; d) IP coal layer, not balanced The mentioned coal layers are generally not d ...
    ... gf.bg.ac.rs 4bstract:The Kostolac-Kovin coal basin with an area of 320 km?, with 5 separate layers of coal and with a total of about 5.7 Bt of geological resources and reserves represents an exceptional potential for coal production in Serbia. The coal resources listed in this way are not fully ...

  • BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations

    Bojan Dimitrijević, Bogoljub Vučković, Radmila Gaćina (2023)
    Geology explorations in KCM runs from 1936. year up to these days and still ongoing. Results in >7,200 drill holes with ≈600,000 m of core drilling and gave lignite ore resources of > 4,1Bt, which 1,15Bt are excavated since 1986. of XIX up to early years of XXI century. For further mining operations in open pits stay 1,5Bt of lignite. Under waste heaps are ≈80 km2, additional 85 km2 should be filled. All of that masses/areas were, are ...

  • Eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje

    Marko Lazić, Filip Miletić, Milena Lekić, Veljko Rupar, Željko Petrović, Lazar Žujović (2021)
    U radu su analizirani eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje. Period analize je prvih šest meseci tekuće godine. Analiza je vršena sa aspekta ostvarene proizvodnje, kvaliteta uglja, efektivnog vremena rada, kapacitetnog i vremenskog iskoršćenja i zastoja sistema. Za poređenje podataka različitih parametara koji po svojoj prirodi nisu međusobno uporedivi, u radu su korišćene metode višekriterijumskog odlučivanja.
    proizvodnja uglja, zastoji, metode višekriterijumskog odlučivanja
    ... odlučivanja. Abstract: This paper analyzed the exploitation effects of coal systems at the open–pit mine Tamnava–West field for the first six months of the current year. The analysis was performed in the aspect of reached production, coal quality, effective working time, capacity and time utilization and system ...
    ... Eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje Exploatation effects of coal systems on the open pit mine Tamnava–West field Marko Lazić[footnoteRef:1], Filip Miletić[footnoteRef:2], Milena Lekić2, Veljko Rupar2, Željko Petrović[footnoteRef:3] ...
    ... Srbije, 2019.; [4] Samanta, B., Sarkar, B., & Murkherjee, S.K. (2002). Selection of opencast mining equipment by a multi-criteria decision-making process. Mining Technology, 111(2), 136-142; [5] Basçetin, A. (2009). The study of decision making tools for equipment selection in mining engineering operations ...

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... analysed dozers in the Kolubara coal mining basin (Serbia), according to the strength of the machine, fell into the class of strong dozers, and the information on the manufacturer, type and number are stated in Table 1. During further analysis, on the basis of the quality of the available information, Liebherr ...
    ... application of the AHP method as one of the most used method of multicriteria decision analysis (MDCA) showed the rank of different types of dozer most commonly used auxiliary machine in open-cast coal mine of Kolubara. The subjects of the analysis were four dozers analysed by a combination of four basic ...
    ... this method is ease of use, followed by the quality of output data. It relies on the theory of the relative weight determination of the factors in decision-making. It is based on the measurements made by comparing pairs of data, and it depends on the evaluation of experts for defining priority scales [28] ...

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... level and quality of project work, both regarding the quality of content, namely data and information, but also regarding the quality of structural relations among data, as well as quality of user interface featuring easy and simple search and display od structured data. Development of the software ...
    ... Energies 2016, 9, 567 13 of 14 other domains. Special attention was given to securing a high level and quality of project work, both regarding the quality of content, namely data and information, but also regarding the quality of structural relations among data, as well as quality of user interface featuring ...
    ... related to surface coal mining by improving access to data, timely dissemination of data and understanding of geospatial data on different scales and at different levels [20]. The Abandoned Mine Land Inventory System (e-AMLIS) includes information on abandoned mines that are in need of remediation, and ...

  • Facies analyses, biostratigraphy and radiometric dating of the Lower-Middle Miocene succession near Zajecar (Dacian basin, eastern Serbia)

    Ljupko Rundić, Nebojsa Vasić, Miodrag Banješević, Dejan Prelević, Violeta Gajić, Bojan Kostić, Jelena Stefanović (2020)
    Седиментна сукцесија између доњег и средњег миоцена и складан тј. дискордантан однос између језерско-континенталних наслага (нпр. DLS, SLS) и баденских морских седимената представља једну од занимљивих тема. У овом раду смо проучавали пет истражних бушотина (источна Србија) и анализирали главни фацијални образац, биостратиграфске карактеристике миоценске сукцесије и применили U-Pb радиометријско датирање вулканских туфова интерстратификованих у седиментној серији са слојевима угља (бушотина NRKR-17002). Добиjeна је конкордија старост од 16,9 ± 0,2 милиона година за сва анализирана зрнца циркона без наследних ...
    Доњи–средњи миоцен, језерске фације, морска трансгресија, U-Pb геохронологија, источна Србија.

  • Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae

    Hans Peter Nytoft, Geir Kildahl-Andersen, Sofie Lindström, Frode Rise, Achim Bechtel, Danica Mitrović, Nataša Đoković, Dragana Životić, Ksenija A. Stojanović (2019)
    Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMRspectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10?20)-abeo-abietane or icetexane skeleton, consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270?146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant ...
    Geochemistry and Petrology

  • Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović (2022)
    This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...
    системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композиција