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Geosystem Engineering
Taylor & Francis Ltd.
Geosystem Engineering

Taylor & Francis Ltd.

1226-9328

Geosystem Engineering/Journal Geosystem EngineeringEIESCI
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    Optimization of blending and production processes considering origin mines and metallurgical units using linear programming rules

    Mohamed G. FarghalyMahrous AliJong-Gwan Kim
    7页
    查看更多>>摘要：This paper discusses a model that can optimize plant operation by considering transportation cost and metallurgical assays. All boundary conditions were set using ore samples taken from different locations in the same mine. Transportation from the mine to milling plants, dumping areas, and leaching units is also analyzed. Transportation from the mill to the smelter depends on assay results to ensure market readiness. We hypothesize that the grade of the material varies according to its source because milling plants are built to process different types of ore. Mines and processing units may be far apart, and therefore, it is critical to optimize production. Previous studies have discussed mine production optimization but did not consider metallurgical plants. The proposed model merges all units of a production system to determine the optimal planning solution. Linear programming uses network formulations of planning problems to consider a combination of mining and metallurgy operations. This technology is useful for analyzing the combination of two major systems, and hence, the dual theory was used in formulating the problem. The final model was applied to minimize the costs of production and distribution. The study checked the optimality of the solution for accuracy and its use as an indicator for long-term planning.
      原文链接:
    • NSTL
    • Taylor & Francis

    Applying data mining techniques for forecasting geochemical anomalies

    Bita Hezarkhani
    15页
    查看更多>>摘要：Undoubtedly, forecasting the anomalous values could play an important role in the inchoate stages of exploration. Therefore, it is essential to find the most accurate approach to separate anomalous values from background and afterward use the results to anticipate each arbitrary sample. In this study, results of a structural multivariate method (the combination of Mahalanobis distance and U-statistics algorithms) are used to distinguish anomalous values from background. Then, three data mining methods will be applied to produce practical equations and finally estimate anomalous values. Actually, at the first, separation of geochemical anomalies, based on the combination of the U-statistics and the Mahalanobis distance approaches, would be done. Afterward, three data mining methods, K nearest neighbor (K-NN), decision tree, and na?ve Bayes classifier have been applied based on separation results and the other parameters-x and y coordinates and Cu and Mo grades. For this purpose, after separation of anomalous values according to the number of 377 collected surface samples from Parkam porphyry system by applying above combination, the data mining methods would be utilized to anticipate anomalous values for each unknown point. Finally, in order to judge about the designed networks, training samples would be considered as test samples under the application of the networks. Results show that the decision tree method would appear as the more powerful approach than the other due to far fewer number of wrong estimated samples and approving high accuracy of the designed network. Noteworthy is that resubstitution error for this network is noted only 0.0212 based on numbers of wrong estimated samples (8 from 377). Whereas, the numbers of wrong estimated samples for K-NN and na?ve Bayes methods are, respectively, 13 and 46 and the rates of error are 0.0345 and 0.122. Moreover, it was observed that the estimated samples (the joint points of Cu and Mo) delineated by decision tree
      原文链接:
    • NSTL
    • Taylor & Francis

    Investigation of natural gas flooding and its channelling prevention as enhanced oil recovery method

    Dong LifeiWang MiaoWang WeiLin Hun...
    8页
    查看更多>>摘要：The natural gas can improve the flooding effect as its excellent flow property and dissolution ability, but it is also easily to form the serious gas channelling when injecting gas continuously. In order to decribe the advantages and disadvantages of natural gas flooding, the oil dispalcement experiments of injecting natural gas after water flooding with different permeability cores are done. The natural gas channelling and its prevention manner are discussed by theoretical and experimental analysis, and the water alternating natural gas (WAG) injection is introduced. The results show that the natural gas flooding can enhance oil recovery after water flooding in different permeability reservoirs, especially in lower permeability reservoirs. The continuously natural gas flooding can easily form and develop the gas channeling. It takes only 0.13 PV to 0.45 PV natural gas injection to form the gas channelling, and spends 0.5 PV to 1.5 PV injection to develop the gas channelling for making the gas-liquid ratio reaching to 200 in the cores with the permeability from 6.876 × 10~(?3)μm~2 to 540.124 × 10~(?3)μm~2. The WAG injection with the WAG cycle below 2 can prevent the natural gas channelling and keep the good natural gas utilisation in low/ultra-low permeability reservoirs.
      原文链接:
    • NSTL
    • Taylor & Francis

    Role of expanded clay aggregate, metakaolin and silica fume on the of modified lightweight concrete properties

    Taher A. TawfikBassam A. TayehKhaled Ali MetwallyIbrahim M. ElKattan...
    12页
    查看更多>>摘要：This investigation aimed to assess the effect of micro-cementitious materials on the mechanical properties and sulphate resistance of modified eco-efficient lightweight concrete (MDLWC). A modified lightweight concrete (MDLWC) was produced by mixing Light-expanded clay aggregate (LECA) with normal coarse aggregate (dolomite cushed rock). The impact of using different percentage of micro-cementitious materials which was micro silica fume (5-20%) and metakaolin (10-35%) on the mechanical properties (compressive strength, splitting tensile and flexural strength), waves transmission velocity of the ultrasonic pulses and sulphate resistivity of MDLWC was studied. The overall results illustrated that the use of micro-cementitious materials in MDLWC caused an enhancement on MDLWC properties. However, the MDLWC specimens containing micro silica fume showed better results than metakaolin. The best results were observed while using samples containing 10% micro silica fume and 30 % metakaolin individually or combined. In addition, the usage of combined mixture of 10% micro silica fume and 30% metakaolin MDLWC mix showed the best improvement rate in compressive, splitting tensile and flexural strengths by 25, 53.3 and 66.6%, respectively, compared to control MDLWC specimens. On the other hand, the direct empirical equations were proposed on the basis of strong and nonlinear regression analysis using the test data to predict the mechanical properties of MDLWC relationships, rationally. Experimental tests were conducted on ultrasonic pulses velocity, which showed good correlation equation strength of MDLWC. Scanning electron microscopy illustrated that the pores of concrete is smaller for SF and MK individually or combined with MDLWC compared to the control concrete, demonstrating an enhancement within the interfacial microstructure with the pozzolanas incorporation. The previous difference could be explained due to the concrete strength and sulphate penetrability to an extent.
      原文链接:
    • NSTL
    • Taylor & Francis

    Metals in mine wastes: environmental pollution and soil remediation approaches-a review

    Taoufik El RasafiMohamed NouriAbdelmajid Haddioui
    16页
    查看更多>>摘要：Millions of hectares in Africa, Europe, Asia, Australia, and America are contaminated of mine wastes. This contamination has caused a serious danger to humans, animals, plants, and microorganisms near mine sites. Such contamination may cause kidney dysfunction, reproductive deficiencies, mental retardation, or even death. These sites need to be remediated urgently to minimize their effect and for safety of the ecosystem and the environment health. Different approaches were used including chemical, physical, and biological approaches. Due to the limitations of the physicochemical techniques, the major interest was been devoted to the biological techniques, especially the phytoremediation. These techniques are considered as the future solution for cleaning the contaminated sites with mine wastes. The present review discusses the metals in mine wastes and their effects of humans, animals, plants, and microorganisms as well as the used remediation techniques to treat the contaminated soils.
      原文链接:
    • NSTL
    • Taylor & Francis

    Grinding characteristics of waste printed circuit boards in hammer mill using population balance model

    Wonjae LeeSeungsoo ParkJaikoo Park
    7页
    查看更多>>摘要：In this study, the grinding characteristics of waste printed circuit boards (PCBs) were evaluated using a population balance model (PBM). The grinding characteristics under various conditions (hammer rotational speeds of 1600, 2000, and 2400 rpm; screen aperture sizes of 0.71, 1.0, and 1.40 mm; and maximum feed sizes of 4, 6, and 8 mm) were identified. A PBM for a continuous hammer mill was used to quantitatively demonstrate the grinding characteristics. No significant difference was observed in the particle sizes of the products for various hammer rotational speeds. Nevertheless, the specific rate of breakage increased with the hammer rotational speed. As expected, a narrow screen aperture yielded a fine product. The mean residence time was increased in this case to comminute the particles to a finer size. Furthermore, a finer feed was predicted to yield a finer product; however, a coarser feed was observed to yield such a product instead. Each hammer milling condition should be controlled with respect to the hammer milling performance and target particle size of the product.
      原文链接:
    • NSTL
    • Taylor & Francis

    Neutralization of acidic soil using Myxococcus xanthus: Important parameters and their implications

    MinJung ChoSeonYeong ParkEunYoung YouChangGyun Kim...
    8页
    查看更多>>摘要：Soil acidification through acid rain/deposition has been a serious problem that adversely affects the soil environment. In this study, Myxococcus xanthus, myxobacteria, was assessed towards neutralization of artificial acidic soil. Differences in initial pH and peat moss content in soil with incubated M. xanthus were being compared using a one-variable-at-a-time approach. It showed that the M. xanthus could neutralize the acidified soil using their specific metabolism, producing ammonium ions and hydroxide simultaneously. Increasing peat moss content could direct the neutralization performance of M. xanthus towards inhibition whereas reducing the peat moss content could improve the neutralization performance. Among experimental parameters such as initial pH, peat moss content in soil, and microorganism concentration, the interaction of soil amount either with peat moss content or microbial population density was meaningfully correlated to the neutralization of acidic soil.
      原文链接:
    • NSTL
    • Taylor & Francis

    Effect of reservoir properties on the heat extraction performance in multi-well production EGS

    Songze LiuJianguang WeiHongliang LiuXuemei Liu...
    8页
    查看更多>>摘要：A multi-well production enhanced geothermal system (EGS) with discrete fracture network is designed for heat extraction in this study. A thermal-hydraulic numerical simulation model is established, and the effect of reservoir properties on heat extraction is investigated. The results show that the growth rate of heat extraction efficiency will decrease as the mining time increases. The initial reservoir temperature has a positive correlation with average production temperature which provides a broad space for the use of extracted thermal energy. The variation of initial reservoir pressure has little effect on the heat extraction performance. A higher matrix permeability leads to a higher average production temperature and heat extraction ratio which prompts more working fluid flow into the matrix, the heat transfer process is enhanced. Under the conditions of this study, the preferred initial reservoir temperature is 493.15 K, the matrix permeability is 10~(?14)m~2.
      原文链接:
    • NSTL
    • Taylor & Francis

    Trace elements geochemistry of the Golbanoo coal basin, Iran

    Kaveh Pazand
    10页
    查看更多>>摘要：The Jurassic coal deposit in the Golbanoo area contains coal seams with thickness ranges from 5 cm to 1 m and is underlain and overlain by thin coaly shale, sandstone and siltstone beds. This study reports on the geochemical features of coals and non-coal rocks based on the 30 channel samples were collected and analyzed for trace elements using neutron activation analysis (INAA) and for major elements by X-ray fluorescence. The Al_2O_3, SiO_2 and Fe_2O_3 concentrations are the main oxides. The amounts of trace elements (As, Ag, Br, Sb, Cr, Co, Sr, Zn, Ta, and ΣREE) in Golbanoo coal are high compared to world types of coal. The volcanic activity and their sulfide mineralization in study area is a favorable factor for accumulation of trace element in coal layers.
      原文链接:
    • NSTL
    • Taylor & Francis

    An overview on advances in computational fracture mechanics of rock

    Mojtaba MohammadnejadHongyuan LiuAndrew ChanSevda Dehkhoda...
    24页
    查看更多>>摘要：Due to its complexities, rock fracturing process still poses many pressing challenges despite intense research efforts. With the rapid development of computational mechanics, numerical techniques have gradually become robust tools for the investigation of rock fracture. Nevertheless, not all of the devised methods are capable of adequately modelling the rock fracture process. For an accurate simulation of the process, a numerical method needs to be capable of modelling crack initiation, propagation, bifurcation, coalescence and separation. This paper provided a review of recent advances in computational analysis of the rock fracture process, which is built upon a number of literature on numerical modelling of mechanics of failure in rock and other brittle materials. After briefly discussing the fundamentals of rock fracture mechanisms, the basic structure of the existing and recently developed numerical techniques such as finite element method, boundary element method, distinct element method, combined methods and multi-scale coupled method are illustrated. Finally, the strengths and weaknesses of these numerical techniques are discussed and the most promising methods are highlighted.
      原文链接:
    • NSTL
    • Taylor & Francis