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Abstract
One area in AG/SAG milling field which has received great attention is optimization of liner design for any application to increase availability of mills. The Gol-E-Gohar iron ore concentration plant uses three 9m x 2.05m autogenous mills (AG) in parallel in a dry operation. The AG mill shell is lined with three series (57 cm each) of 36-row liners. Due to large variations in feed characteristics and inadequate blending, performance of AG mills has been lower than target value. Therefore, to improve comminution efficiency, optimization of design of AG mill shell liners was applied in this plant. By simulation it was found that increasing liner lifter face angle from 7 to 30° while maintaining original lifter height (i.e., 22.5 cm) could provide an appropriate charge trajectory. Measurement of wear profiles of shell liners indicated that wear along liner length was not uniform and highest wear occurred between 0.5 m and 1.2 m of mill length. A new liner design was proposed by redistributing metal from parts with lower wear rate to parts with higher wear rate to arrive at a uniform wear profile along liner length at liner removal time. The non-uniform shell liner was constructed and installed in one of three parallel dry AG mills. It was found that first and second liner designs increased mill throughput by 2.6 and 7.5%, respectively. After conversion to SAG milling on account of liner change, 18% (from 413 to 489 t/h) increase in throughput was realized. It was predicted that non-uniform liner designs will increase liner life time by 10% and will reduce scrap metal from current value of 59% to 50%.

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	All Years to Access Full-Text Export citations Optimization of the design of AG Mill shell liners at the Gol-E-Gohar concentration plant By M. Maleki-Moghaddam, M. Yahyaei, A. Haji-Zadeh, H. Asadi, S. Banisi Published in International Mineral Processing Congress (IMPC) at 2014 Direct link: http://kmpchemmat.ir/pii/42866 Abstract One area in AG/SAG milling field which has received great attention is optimization of liner design for any application to increase availability of mills. The Gol-E-Gohar iron ore concentration plant uses three 9m x 2.05m autogenous mills (AG) in parallel in a dry operation. The AG mill shell is lined with three series (57 cm each) of 36-row liners. Due to large variations in feed characteristics and inadequate blending, performance of AG mills has been lower than target value. Therefore, to improve comminution efficiency, optimization of design of AG mill shell liners was applied in this plant. By simulation it was found that increasing liner lifter face angle from 7 to 30° while maintaining original lifter height (i.e., 22.5 cm) could provide an appropriate charge trajectory. Measurement of wear profiles of shell liners indicated that wear along liner length was not uniform and highest wear occurred between 0.5 m and 1.2 m of mill length. A new liner design was proposed by redistributing metal from parts with lower wear rate to parts with higher wear rate to arrive at a uniform wear profile along liner length at liner removal time. The non-uniform shell liner was constructed and installed in one of three parallel dry AG mills. It was found that first and second liner designs increased mill throughput by 2.6 and 7.5%, respectively. After conversion to SAG milling on account of liner change, 18% (from 413 to 489 t/h) increase in throughput was realized. It was predicted that non-uniform liner designs will increase liner life time by 10% and will reduce scrap metal from current value of 59% to 50%.