Bachelor Thesis

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Browsing Bachelor Thesis by Author "Ariubolor, Purvee"

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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.