Abstract
In this work complex investigations of the abrasing wear of lining of self-grinding mills (semiautogenous grinding mills) are carried out with the obtaining of mathematical models of wear-abrasing of elevators in terms of height, weight, volume and worn-out area. In particular, according to the location and nature of the abrasing wear processes, the liner-lifters mill self-grinding are identified in three typical groups. During 1 year, in the conditions of Ingulets GOK, the monitoring of the abrasing wear of selected groups of lifters of self-grinding mills was performed. On the basis of the experimental data calculationed in the Microsoft Office Excel program, a set of mathematical models of lifter abrasing wear was obtained in terms of height, weight, volume and worn-out area. The obtained dependencies are recommended for prediction of abrasing wear of lining and necessary frequency of replacement of inserts-lifters. In addition, the research of wear of lining made of cast iron RF–4, showed a significant reduction in their abrasing wear compared with steel 110G13L. Thus, it has been shown that the selection of liner-lifters materials can reduce the inter–repair period by 3 times or more (replacement of worn-out lifters). A comparison of the actual picture of the abrasing wear of elevators and Simulation Statics simulated result (using SolidWorks) stresses shows the convergence of the arrangement of the zones of maximum stresses and the maximum abrasing wear of the lining. Investigation of the influence of the stressed state of lining plates on the intensity of their abrasing wear – a promising direction for further research.
Highlights
The process of destruction of mineral raw materials is the most energy-intensive and labor-intensive technological operation of ore dressing [1,2,3]
In comparison with grinding in rod and ball mills semiautogenous grinding (SAG) is characterized by a number of advantages: - stages of middle and small grinding are excluded; - saving of crushing bodies; - there is no contamination of the crushed material with metal; - improvement of technological indicators of further dressing due to better disclosure and less sludge formation; - in the processing of gold–bearing ores followed by cyanide losses of gold with iron scrap and crumbs are eliminated, the consumption of cyanide is reduced and the working conditions on quartz and silicone-sensitive ores are improved; - when flotation of molybdenum ores, the use of SAG mills improves the dressing rates associated with less “molten” scaling of molybdenite [1, 5,6,7,8]
According to the results of the monitoring, identify the typical groups of lifts-lifters; – on the basis of the experimental data calculation in the Microsoft Office Excel, to obtain a set of mathematical models of lining of the elevators in terms of height, weight, volume and worn-out area; – to analyze the wear of lifters made of steel 110G13L and cast iron RF–4; – using the SolidWorks software simulation statics module to investigate the mechanical stresses in the work area of the lifters and compare the data with the actual picture of data of their wear
Summary
The process of destruction (grinding and crushing) of mineral raw materials is the most energy-intensive and labor-intensive technological operation of ore dressing [1,2,3]. Investigation of the energy intensity of the processes of ore preparation, including the disintegration of ore, which was carried out in Eastern Europe in 14 mining ore dressing plants that process different raw material physical and mechanical properties, show that 50–70% of the total ore disintegration process accounts for 50–70% expenses, while the electric power consumption for grinding is on average about 60%, and for crushing only 5% [4,5,6]. It actualizes the research of equipment and technology of milling minerals. The efficiency of the process of SAG ore in the mills depends to a large extent on the design, location and serviceability of lifters
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