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Mineral processing plant location using the analytic hierarchy process——a case study:the Sangan iron ore mine(phase 1)

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Mining Science and Technology 2010年第5期20卷 691-695页

作者： SAFARI Mohsen ATAEI Mohammad khalokakaie reza KARAMOZIAN Mohammad Faculty of Mining Engineering Petroleum & GeophysicsShahrood University of Technology

Locating the mineral processing plant near a mine is the most important parameter that affects the whole *** factors,and their preferences,should be considered in this *** factors include economical,geological,technical,environmental and tectonic parameters.A multi-criteria decision making method is necessary to rank the *** this paper we describe how plant location is selected by using the Analytic Hierarchy Process(AHP).This method,with eight criteria,was used to select a location for the mineral processing plant at the Sangan iron ore mine(phase 1).Three alternatives for the processing plant were *** main criteria were distance from the mine,access to heavy machinery transport,the amount of excavation required for grading,bed mixture capacity,belt conveyor length,distance from the tailing dam,distance from the waste dumps and surface water diversion ***,the alternatives were ranked and the best location was proposed.

关键词：层次分析法选矿厂位置铁矿多准则决策方法案例运输距离皮带输送机

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Reliability and maintainability analysis of electrical system of drum shearers

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Journal of Coal Science & Engineering(China) 2011年第2期17卷 192-197页

作者： SEYED Hadi Hoseinie MOHAMMAD Ataei reza khalokakaie UDAY Kumar Faculty of Mining Petroleum ＆ Geophysics Shahrood University of Technology Shahrood *** Iran Division of Operation and Maintenance Engineering Lulea University of Technology Lulea 97187 Sweden

The reliability and maintainability of electrical system of drum shearer at Parvade.1 Coal Mine in central Iran was analyzed. The maintenance and failure data were collected during 19 months of shearer operation. According to trend and serial correlation tests, the data were independent and identically distributed (iid) and therefore the statistical techniques were used for modeling. The data analysis show that the time between failures (TBF) and time to repair (TTR) data obey the lognormal and Weibull 3 parameters distribution respectively. Reliability-based preventive maintenance time intervals for electrical system of the drum shearer were calculated with regard to reliability plot. The reliability-based maintenance intervals for 90%, 80%, 70% and 50% reliability level are respectively 9.91, 17.96, 27.56 and 56.1 h. Also the calculations show that time to repair (TTR) of this system varies in range 0.17∼4 h with 1.002 h as mean time to repair (MTTR). There is a 80% chance that the electrical system of shearer of Parvade.1 mine repair will be accomplished within 1.45 h.

关键词：滚筒采煤机可靠性水平电气系统可维护性平均修复时间 Weibull 预防性维修对数正态分布

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Prediction of cavity growth rate during underground coal gasification using multiple regression analysis

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International Journal of Coal Science & Technology 2015年第4期2卷 318-324页

作者： Mehdi Najafi Seyed Mohammad Esmaiel Jalali reza khalokakaie Farrokh Forouhandeh Department of Mining and Metallurgical Engineering YazdUniversity Safayieh P.O. Box 89195-741 Yazd Iran Faculty of Mining Engineering Petroleum and GeophysicsShahrood University Shahrud Iran Department of Mathematics Shahrood University ShahrudIran

During underground coal gasification (UCG), whereby coal is converted to syngas in situ, a cavity is formed in the coal seam. The cavity growth rate (CGR) or the moving rate of the gasification face is affected by controllable (operation pressure, gasification time, geometry of UCG panel) and uncontrollable (coal seam properties) factors. The CGR is usually predicted by mathematical models and laboratory experiments, which are time consuming, cumbersome and expensive. In this paper, a new simple model for CGR is developed using non-linear regression analysis, based on data from 11 UCG field trials. The empirical model compares satisfactorily with Perkins model and can reliably predict CGR.

关键词：煤炭地下气化气化过程多元回归分析增长率非线性回归分析孔洞测地数学模型

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