TAILIEUCHUNG - Modern Tribology Handbook 2010 Part 13

Tham khảo tài liệu 'modern tribology handbook 2010 part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 35 Tribology of Earthmoving Mining and Minerals Processing Jeffrey A. Hawk . Department of Energy . Wilson . Department of Energy Introduction Wear Processes in Mining and Minerals Processing Digging and Loading Haulage Crushing Conveying Handling Storage Screening Grinding Size Classification Minerals Separation and Concentration Equipment Used in Earthmoving Operations Small-scale Earthmoving Large-Scale Earthmoving Equipment Used in Mining and Minerals Processing Crushers Grinding Equipment Sand Pumps Classifiers Flotation Machines Magnetic Separators General Classification of Abrasive Wear Abrasive Wear Tribological Losses in the Mining of Metallic Ores Coal and Non-metallic Minerals Surface Mining Shaft Mining and Drilling Ore Processing and Related Activities Financial Cost of Wear in Earthmoving Mining and Minerals Processing Concluding Remarks Introduction Earthmoving mining and minerals processing each involve frequent and often severe mechanical interactions between metals and between metals and abrasive nonmetallic and metallic materials . mineral bearing ores . The abrasive nature of ores causes significant wear to extracting handling and processing equipment. Consequently wear in earthmoving mining and minerals processing operations results in the removal of large amounts of material from the wear surfaces of scraping digging and ore processing equipment. From an energy point of view material wear of this nature is classified as an indirect tribological loss Imhoff et al. 1985 . Additionally a significant amount of energy is expended to overcome frictional forces in the operation of all earthmoving mining and minerals processing machinery . a direct tribological loss . However in these particular processes wear losses are more than five times those of frictional losses Imhoff et al. 1985 . In general the amount of material lost from a particular component in these operations before it becomes

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