Atac Bascetin

The study of a fuzzy set theory for the selection of an optimum coal transportation system from pit to the power plant

ABSTRACT In this paper, we purpose a fuzzy multiple attribute decision making for the selection of an optimal transportation system to a power station to be established in an open pit coal mine located Can, west of Turkey. So far, various types of formulations or solutions methods have been proposed with transportation systems, but most of them exclusively considered linear functions as objective functions. Real world study is decision making under subjective constraints of different importance, after using uncertain data (linguistic variables), where compromises between competing criteria are allowed. The authors have explained in theory and by detailed example a new combination of fuzzy set of transportation systems.

APPLICATION OF FUZZY MULTIPLE ATTRIBUTE DECISION MAKING IN MINING OPERATIONS

This paper presents a fuzzy multiple attribute decision making as an innovative tool for criteria aggregation in mining decision problems. So far, various types of formulations or solution methods have been proposed with mining systems, but most of them exclusively considered linear functions as objective functions. Real world study is decision making under subjective constraints of different importance, after using uncertain data (linguistic variables), where compromises between competing criteria are allowed. It seems however that this technique is still very little known in mining. It is one of the aims of this case study to disseminate this technology in many mining fields. The paper is divided into four sections. The first section provides an overview of the underlying concepts and theories of multiple attribute decision making in a fuzzy environment and the scope of this type of search. The second section introduces few applications of fuzzy set theory to mining industry problems reported in the literature. Some of these applications are briefly reviewed. The third section presents two case studies which illustrate the application of the system for equipment selection in surface mining and method selection in underground mining in a fuzzy environment, and highlight the flexible nature of the approach. Details of alternative systems and their criterion of each operation are given. And finally the fourth section presents the concluding remarks.

The effects of cement on some physical and chemical behavior for surface paste disposal method

Environmental impacts resulting from conventional tailings disposal such as tailings dam accidents are a common problem for base metal mines around the world. In this context, laboratory-scale studies have been carried out on the Surface Paste Disposal (SPD) method, which is one of the alternative surface storage methods. In this study, three different SPD designs were tested; and volumetric water content, oxygen consumption, and matric suction sensors in first, fifth and 10th paste layers plus pH- electric conductivity (EC) values were all measured. Specifically, it was determined that the amount of oxygen in the environment required for the oxidation of sulfur minerals is reduced in the cemented layers in Design 3. In addition, the cement additive keeps the pH values of the seepage in an alkaline environment (over 7) so that it minimizes the risks of Acid Mine Drainage (AMD) and heavy metals mobilization at low pH values. Also, the EC values started a downward trend and ion dissolution decreased in designs with cemented layers. As a result, it was understood from the sensor measurements that the cemented layers act like a barrier.

Application of Pb-Zn tailings for surface paste disposal: geotechnical and geochemical observations

Abstract Surface paste disposal (SPD) technology has been investigated recently to solve the geotechnical (tailings dam failure) and geochemical (acid mine drainage formation) problems relating to tailings disposal. The tailings dam accidents occurred in the last few years have expedited the researches to search for safer tailings disposal methods in mining industry. The aim of this study is to investigate which parameters affect the geotechnical and geochemical stability of sulphidic paste tailings as SPD. The pH, EC and crack intensity of paste tailings placed in layers were measured to observe how the parameters affect their stability. In this study, it can be seen that solid concentration of the paste material increases above ~80 wt.%, and its shear strength is above 20 kPa. In addition, the pH values reduced from 7.4 to 6.6 and the EC values increased from 2.9 to 3.3 mS/cm in seepage water of the paste layers. According to these values, it can be said that there is a very low environmental risk using the SPD. Results showed the applicability of the SPD method by obtaining geochemical and geotechnical stability.

Field Properties and Performance of Surface Paste Disposal

A significant amount of tailings with a high content of cyanide or sulphur arises from the beneficiation process of metallic mines such as gold, silver, copper, and lead. The influence of these hazardous tailings on the environment may have multiple aspects. The control and configuration of this kind of environmentally dangerous tailings in terms of isolation at disposal site, construction of impermeable layers, transportation from plant, stabilization, safety, their effects on water, and soil quality are the main parameters that could be considered carefully. In this context, tailings management are very important to selection of the optimum disposal method. Also, the some parameters such as physical and chemical characterization of tailings, properties of newly formed material (e.g. acid potential, stabilization, cost and applicability of the paste tailings etc.) should be evaluated. Safely disposal of mine tailings under surface conditions is of great importance in the aspect of environment.

Report for SWEMP2016/CAMI2016

‘16th International Symposium on Environmental Issues and Waste Management in Energy and Mineral Production (Swemp2016)’ and ‘6th International Conference on Computer Applications in the Minerals Industries (CAMI2016)’ symposiums were taken place in Istanbul, Turkey from 05–07 October 2016. Total of 93 delegates have attended to the symposiums which provided excellent international forum for sharing knowledge and expertise for students, researchers and industry. Total of 124 scientific papers (68 in SWEMP2016 and 56 in CAMI2016) were published in the symposium proceedings.

The investigation of Co2 emissions for different rock units in the production of aggregate

Abstract The negative effects of CO2-e, which are apparent on a global scale, should be monitored and controlled by responsible governmental authorities. This responsibility should be assumed because CO2 emissions (CO2-e) result from human activities, particularly the usage of fossil fuels which contribute to the phenomenon of global warming. This study will analyse the methods employed for CO2-e and energy calculation in the affected location of a quarry. One of the ways to optimise energy usage and minimise the effects of CO2-e is to ascertain the most detailed and comprehensive degree of planning and design for the mine location to be studied. In order to achieve this, essential, aggregate material properties should be defined then analysed by a related authority. Within the scope of this study, CO2-e unit value released during aggregate production in distinct formations was defined. The distribution of CO2-e values which are dependent on the energy consumption which occurs during aggregate production was also examined. In conclusion, it was found that the diesel fuel consumption had been the most significant CO2-e factor by a rate of 88%.