Browsing by Author "Temuulen Purevdorj"

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    Analysis of Coal Combustion By-Products (CCBs) in Mongolia in Consideration of the Characteristics to be suitable for Backfilling and Securing of abandoned Small Scale Coal Mines
    (German Mongolian Institute for Resouce and Technology, 2019-05-07) Khangai Gerelsukh; Baasandorj Myagmarsuren; Temuulen Purevdorj; Peter Vossen; Martin Knippertz
    The research aimed to evaluate the possibility to use CCBs and industrial wastes for backfilling material for underground mines. Hundreds of thousand tons of CCBs in Mongolia is being landfilled despite its economical and beneficial properties. Following tests and analyses were made to evaluate CCBs and industrial wastes: sieve analysis, SEM analysis, radioactivity detection, moisture content analysis, XRF chemical content analysis, uniaxial compression test, elution test and FTIR analysis. Total of 9 CCBs and 1 electric-arc furnace slag from 7 different location/plant have been evaluated to represent Mongolian CCBs. Backfill mix designs were designed to compare the materials and to choose the best suited material for backfilling purpose. During the research, fly ash from the thermal plant #4 and ger district bottom ash had been proven as a suitable material for backfilling while other material can be utilized but, other binder additives such as portland cement must be used. Any of the evaluated materials in this research are investigated not being harmful to environment and to human health. Fly ash and ger district ash are the most common CCBs in Mongolia. More than 200 thousand tons of fly ash and another 200-230 thousand tons of ger district bottom ash are being generated annually.
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    Elongation of transfer chute service life on material perception
    (German Mongolian Institute for Resouce and Technology, 2018-08-15) Temuulen Purevdorj; Gunther C. Stehr; Ariubolor, Purvee
    This study has looked into wearing mechanism on liners in transfer chute used at Oyu Tolgoi mine. And it searched for ways to reduce wearing rate so that the mining operation could benefit in numerous ways. Wearing takes place dominantly in form of abrasive wear whose base is on micro-cutting mechanism. Worn liner samples made of Hardox 500 mark and a bag of coarse ore were provided for study purpose by the company. For referential purpose, the same intended steel marked as 110Г10Л was requisted and supplied from Erdenet Mine. After analytic analyses, it has been still believed that wearing rate advances as thickness of liners reduce. The conducted hardness test shows hardness gradient, emphasizing wear rate deviation. But microscopic analysis does not show much of evidence that wearing rate could be different over thickness. And heterogeneous wearing rate over liners was noted. The employed steel - (as producers state that martensite - bainitic structured) Hardox 500 for making liners, is known as the best selection for operation under high abrasive conditions. No material enhancement effort was made, therefore. Instead, combination in usage of hardox 500 and 550 was suggested for more homogeneous wearing rate distribution over the liners. At the most optimistic scenario, the combination could increase chute service time by 100% and reduce liner inefficient use by 28.9%. Taken assumptions for the estimations may be superior. Sections dedicated for studying hardox steels’ usage, mechanical properties, suppliers statement are present in the study.