ball sag mill drive case study

ball sag mill drive case study

SAG Mill Operation at Cortez: Evolution of Liner Design

2016-3-9  Figure 2: SAG Mill Crash Stop on 10/8/2003 Crash Stop #2 March 3, 2004 Please refer to Figures 3-5. This crash stop was done on severely SAG mill limiting ore that typically averaged 360-390 dry tph. In comparison, the worst case SAG mill limiting

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SAG mills TON Outotec

SAG milling extends itself to many applications due to the range of mill sizes available. They can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill and some or all of the work done by a ball mill. SAG mills are also an optimum solution for wet grinding since crushing and screening in these cases can be difficult, if not impossible. Efficiency through automatic

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HD Technologies Case Study: Ball Mill Bearing

2019-9-11  This case study describes bearing damage detected through online measurements taken from a ball mill at the flotation plant of Asarel Medet AD in Bulgaria. Asarel Medet AD is among the largest Bulgarian mining companies for the extraction and enrichment of copper ores, located in the territory of Panagyurishte in the Pazardzhik district.

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Optimizing Performance of SABC Comminution Circuit of

2017-5-13  configuration of the SAG mill and ball mill (both rated at 6000 kW with a single pinion drive). The capacity of the SAG mill was not fully utilized, as the actual operating power draw was only 3358 kW. This meant it was only operating at 56% of its maximum power, providing large room for improvement.

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The behavior of the cycloconverter fed gearless drive

2019-11-18  motors (2 x 6.8 MW) for the two ball mills and a 12 MW gearless drive for the SAG mill with its filter circuits. A 14 MVA load and its compensation of 2 x 2 Mvar can represent the low-voltage loads. In this plant, short-circuit currents appeared in the gearless drive when the electrical power company disconnected the external supply.

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Case Study 2 Installation of Variable Frequency Drive

2018-7-5  Case Study 2 Installation of Variable Frequency Drive (VF D) I n Ball Mill Motor Before CP Plant is operating 5 nos. ball mills, with common connection to single 30 HP motor. The motor load test conducted while operating all 5 nos. ball mill simultaneously is shown in table below:

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Grinding Mills an overview ScienceDirect Topics

SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed. The SAG mill trommel undersize is combined with the ball mills’ discharge and pumped to two parallel packs (clusters) of twelve 660 mm diameter cyclones. The cyclone underflow from each line reports to a ball mill

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THE ENGINEERING AND PROCESS EFFECTS OF

motor, ωrated as Hz, which for a Gearless Mill Drive is simply ϕRPM ÷ 60. For a gear driven mill, the motor speed is a function of the mill speed ϕRPM, and the gear ratio of the mill bull gear and the drive pinion. CASE STUDY N° 1: CHANGING PINION ON A FIXED SPEED MILL

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Taking Control of the Mill Feed R2 Orway Mineral

2014-10-1  The 4.27 Ø m x 12.94 m EGL secondary ball mill is fitted with a 4125 kW motor and operates in overflow configuration. Ball mill discharge slurry gravitates to the feed of the SAG mill discharge screen situated above the mill discharge hopper. In 2002, the grinding circuit became SAG mill limited by the competency of the mill feed. In

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SAG Mill Components Mineral Processing &

2018-4-18  The obvious solution is to use more pinions, say, four per mill, with each pair coupled to the output shafts of a special single-input/double-output reducer — two reducers and two motors per mill. The problems of load division remain in this case, both in the reducers and in the motors. Another solution is to use the so-called “gearless drive.”

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SAG Mill Operation at Cortez: Evolution of Liner Design

2016-3-9  Figure 2: SAG Mill Crash Stop on 10/8/2003 Crash Stop #2 March 3, 2004 Please refer to Figures 3-5. This crash stop was done on severely SAG mill limiting ore that typically averaged 360-390 dry tph. In comparison, the worst case SAG mill limiting

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CONGA: THE WORLD’S FIRST 42 FOOT DIAMETER 28

2021-2-17  SAG mill, 40 ft, 42 ft, gearless mill drive, GMD, SAG manufacture, reliability in this case two machining set-ups were being used. Where previously this required picking up the assembled, partly-machined head, and turning it over as a unit, in this case, 40 ft heads were being completely Ball Mill External Weld Design Cadia 6.7m 37.8

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Case Study 2 Installation of Variable Frequency Drive

2018-7-5  Case Study 2 Installation of Variable Frequency Drive (VF D) I n Ball Mill Motor Before CP Plant is operating 5 nos. ball mills, with common connection to single 30 HP motor. The motor load test conducted while operating all 5 nos. ball mill simultaneously is shown in table below:

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SIMINE Gearless mill drives Siemens

2021-6-9  mill drive is in inching mode, one rotation of the mill is all you need. The mill will reach A harmonic study determines on a case-by-case basis whether the plant configuration and network in question need harmonic Whether you’re talking about SAG or a ball mill, space is a delicate issue, especially in the concentrator. That’s

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BREAKING DOWN ENERGY CONSUMPTION IN

SAG mill (8.5 × 4 m EGL; 5 220 kW), pebble crusher processing the oversize material, and secondary ball mill (5.5 × 10 m; 5 220 kW) processing the undersize fraction. The control volume for each

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THE COMMINUTION CIRCUIT DESIGN FOR THE

2018-2-20  mill work index 11.4 kWh/t and an average RQD of 44%. RQD values of 25% resulted in a SAG mill feed size (F80) between 55 and 60 mm and throughputs of 6200 t/h. RQD values of 55% resulted in SAG mill feed size (F80) of over 70 mm and a SAG mill throughput of 5200 t/h. The Batu Hijau SAG mill specific energy was a function of point load test and

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SAG Mill Liner Design Mineral Processing &

2016-6-6  Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit utilization and SAG mill capacity. As a guideline, mill

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THE ENGINEERING AND PROCESS EFFECTS OF

the mill speed as a fraction of the critical speed, ϕC, can be observed by plotting the process power and torque draw superimposed on the relevant motor capability curve. Such plots for an example mill, the SAG mill at Cadia (described by Dunne et al., 2001) is shown in Figure 3.

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Energy Use of Fine Grinding in Mineral Processing

2013-4-25  AG or SAG mill, intermediate grinding to a ball mill or tower mill, and fine grinding to a stirred mill such as an Isamill or Stirred Media Detritor (SMD). Of course, various exceptions to these typical values can be found. In fine grinding, a material with an F80 of less than 100 lm is comminuted to a P80 of 7 to 30 lm. (P80s of

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SAG Mill Components Mineral Processing &

2018-4-18  SAG Mill Components. Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes required to carry the load and to give the required openings for feeding and discharging the mills. Mill

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Optimizing Performance of SABC Comminution Circuit of

2017-5-13  configuration of the SAG mill and ball mill (both rated at 6000 kW with a single pinion drive). The capacity of the SAG mill was not fully utilized, as the actual operating power draw was only 3358 kW. This meant it was only operating at 56% of its maximum power, providing large room for improvement.

get price

Case Study 2 Installation of Variable Frequency Drive

2018-7-5  Case Study 2 Installation of Variable Frequency Drive (VF D) I n Ball Mill Motor Before CP Plant is operating 5 nos. ball mills, with common connection to single 30 HP motor. The motor load test conducted while operating all 5 nos. ball mill simultaneously is shown in table below:

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SUPPLY, INSTALLATION, & COMMISSIONING OF THE

2015-11-24  SAG mill and 22 ft x 33.5 ft (6.7 m x 10.2 m) ball mills}. There was considerable concern about taking this step, as many saw this as a risky option in the Cadia Feasibility Study performed by Fluor Daniel-Davy. As a result of the level of concern, much investigation went into the selection of the mills before a final decision on the mill

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Grinding Mills an overview ScienceDirect Topics

SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed. The SAG mill trommel undersize is combined with the ball mills’ discharge and pumped to two parallel packs (clusters) of

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SAG Mill Liner Design Mineral Processing & Metallurgy

2016-6-6  Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit utilization and SAG mill capacity. As a guideline, mill

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THE ENGINEERING AND PROCESS EFFECTS OF

the mill speed as a fraction of the critical speed, ϕC, can be observed by plotting the process power and torque draw superimposed on the relevant motor capability curve. Such plots for an example mill, the SAG mill at Cadia (described by Dunne et al., 2001) is shown in Figure 3.

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Solutions for the mining, mineral processing and cement

2020-12-6  • Ball and SAG mill trunnion and gearbox drive systems (where lengthy strip down tended from 6 weeks (worst case) to ap-proximately 2 years with minimal mainte-nance required. Based on the seal geometry, After a detailed study of the customer’s op-eration and needs, SKF will check its com-

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Grinding Circuit Design for Adanac Moly SGS

to include SAG and Ball milling. The hardness of each sample was measured in terms of SAG power index, SPI (for SAG grinding) and Bond Ball mill work index, BWi (for ball mill grinding). A further measure, the Minnovex crusher index, Ci was also measured for use in the CEET program to determine SAG mill feed size (Kosick and Bennett, 2001).

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Energy Use of Fine Grinding in Mineral Processing

2013-4-25  AG or SAG mill, intermediate grinding to a ball mill or tower mill, and fine grinding to a stirred mill such as an Isamill or Stirred Media Detritor (SMD). Of course, various exceptions to these typical values can be found. In fine grinding, a material with an F80 of less than 100 lm is comminuted to a P80 of 7 to 30 lm. (P80s of

get price

SAG Mill Components Mineral Processing &

2018-4-18  SAG Mill Components. Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes required to carry the load and to give the required openings for feeding and discharging the mills. Mill

get price