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The new SAG mill at Xstrata’s Zinc/Lead Concentrator had not been performing to expectation. The mill was operating below design power (2100kW), and at lower rock loads leading to reduced throughput and a shorter liner service life.
Xstrata Zinc: SAG Mill Power Load Control MIPAC mipac au projectprofiles xstratazincsagmillpowerload PROJECT OVERVIEW The new SAG mill at Xstratas Zinc Lead Concentrator had not been performing to expectation The mill
1/1/2007 Average Std Dev. Minimum Maximum SAG Feed SAG Load mpth kPa 131.3 4 454 9.7 24 100.5 4 392 152.7 4 503 42 Figure 7 SAG `Basic' Feed Rate Control (Early) (McKee, 1999). "In grinding, control of AG/SAG mill circuits is the dominant area.
A control strategy recently implemented on a large variable-speed SAG mill at MMG’s Century Zinc operation in Australia is shown in the chart (found on pg. 32). In this case, mill speed is the primary manipulated variable used to control mill load.
ball mill work index was averaging only 11.6 kWh/t, which is not hard. A rod mill work index ﬁ gure was not found but was thought to be in the 16 kWh/t to 18 kWh/t range. The Xstrata Zinc 22 ft ID × 40 ft EGL over ow ball mill ﬂ was installed at Mt Isa in 2009
1/1/2013 In 2005, a rule based approach was developed but it was abandoned as it could not handle disturbances and new control objectives (Bartsch et al., 2008). 284 SAG MILL CONTROL Fig. 3. SAG circuit 6. 6.1 Objectives CONTROLLER DESIGN The goals are to reduce power consumption per ton of ore, increase throughput, protect linings and stabilize quality and operation.
The SAG mill was fitted with a gearless drive with a power rating of 24 MW and the ball mills were also fitted with gearless drive systems, each providing 16.4 MW.
Site Visit to review grinding operations for a single-stage SAG Mill and optimization of circuit conditions considering the effect of Run-of-Mine ore types, oversize hard rock, and material handling problems, both inside and outside of the SAG Mill, on power draw, mill speed, and feed rate.
The IsaMill is an energy-efficient mineral industry grinding mill that was jointly developed in the 1990s by Mount Isa Mines Limited ("MIM", a subsidiary of MIM Holdings Limited and now part of the Glencore Xstrata group of companies) and Netzsch Feinmahltechnik ("Netzsch"),
distribution affects the SAG mill load and the load affects directly the mill power and the efﬁciency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a conventional power or speciﬁc energy model which do not con-sider the projected feed size distribution it is likely that this mill
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