ball sag mill drive case study

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Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh …

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Ball Mill

3.5.2.2 Ball Mills. The ball mill accepts the SAG or AG mill product. Ball mills give a controlled final grind and produce flotation feed of a uniform size. Ball mills tumble iron or steel balls with the ore. The balls are initially 5–10 cm diameter but gradually wear away as grinding of the ore proceeds.

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BENCHMARKING ENERGY EFFICIENCY – A CASE STUDY …

the feed to the two ball mill circuits. Each circuit consists of a ball mill (ML02 and ML350) and a flash flotation stage. The flash flotation stage recovers gold and pyrite for subsequent gold recovery. The ball mills grind the hydrocyclone underflow to the required product size …

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Optimization of mill performance by using

2015-4-16 · mill discharge product size in relation to the lifting effect of the liners. In this specific case, it is obvious that a certain load expansion is needed to allow the coarse particles entering the media charge to be reduced. Therefore, at this stage, a direct measurement of the dynamics in the mill gives very valuable information to the operator.

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SIMINE Gearless mill drives

2020-10-7 · 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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Taking Control of the Mill Feed R2

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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Mill Lubrication System

Mill Lubrication System 1. OBJECTIVES: To identify the definition and importance of a hydraulic lubrication system. To be familiarized with the lubricant and equipment used in the system. To understand the process and various design of Mill lubrication system. To identify some problems encountered by the system, and formulate some recommendation to help fix the problems.

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The influence of mill speed and pulp density on the ...

2009-8-26 · at Frank concentrator, which is being used to study the influence of a variety of grinding parameters. This paper will discuss only the influence of mill speed and pulp density on secondary stage grinding. A ∅0.82 x 1 m open circuit mill was used with reclaimed Merensky tailings as feed.

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Choosing a SAG Mill to Achieve Design Performance

2013-5-6 · Choosing a SAG Mill To Achieve Design Performance John Starkey1, Principal Consulting Engineer Sami Hindstrom2, Manager, Grinding Travis Orser2, Project Manager, Grinding 1 Starkey & Associates Grinding Design and Process Engineering 336 …

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on a ball mill what rockwell should the pinion be

Ball Mill Industrial I Know More. 17 Jun 2020 The CAM I-MOP14 is a lead oxide ball mill with a production capacity of ball mills were designed over 30 years ago with a crown and pinion drive system. The control system is based on a Siemens or Rockwell PLC,...

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Mill drives: the desire for increased power and the ...

2020-7-27 · a “SAG Mill limiting” condition, i.e., harder ore, or a “Ball Mill limiting” condition, i.e., softer ore exists. For example, a ratio of 1:1.5 or up to 1:2 would indicate a trend away from processing harder ore types and an increasing bias toward processing softer ore …

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Case Study

The drive spindle has three (3) bearings: two (2) cylindrical roller bearings and one (1) ball bearing. The mill is being belt driven by a 100 hp, two-pole motor. The mill normally operates at 3,150 rpm. 1.Outboard Motor Bearing Legend 2.Inboard Motor Bearing 3.Inboard Mill Bearing* 4.Outboard Mill …

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Mill Charge

A ball mill is an effective means of dispersing solid materials in solids or liquids. 8, 9 Ball mills have several advantages which include versatility, low cost of labor and maintenance, the possibility of unsupervised running, no loss of volatiles, and a clean process. The disadvantages are related to discharging viscous and thixotropic ...

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Case Studies Archive

Customer Profile A Large International Mining Equipment OEM for Ball and AG/SAG Mills Application Open Gear Lubricant Spray System to service a Ball Mill with Mining and Heavy Industry Almasol® High Temperature Lubricant (1250) Dramatically Reduced Furnace Roller Failures & …

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Ball mill high vibs | AMP Maintenance Forums

Hi Observing high vibs on pressing and lifting pinion DE and NDE bearing on a ball mill. Motor and main GB drive are OK. Clear predominant gear mesh frequency is appearing in the spectrum along with harmonics and side bands. But 1st GMF is predominant. side bands with pinion speed is seen. no GG speed side band was observed Some of the vib data, spectrums and photos shown in the attachment.

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CONGA: THE WORLD’S FIRST 42 FOOT DIAMETER 28 MW …

2018-5-10 · 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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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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HIGH INTENSITY GRINDING ISSUE 32 AT ITS FINEST

2017-6-27 · manufacture of a Ø40’x29’ SAG mill. The mill will be driven by a Gearless Motor Drive (GMD) which, at 28.0MW, is equal to the largest grinding mill power ever used in the mining industry. The SAG mill design is based on Outotec’s proprietary grinding mill technology, developed over decades for maximum reliability and performance.

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Understanding Size Effects of Semi-autogenous …

Understanding Size Effects of Semi-autogenous Grinding (SAG) Mill Operation as a Pathway to Solving Feed Disturbances - Case Study using the MMG Century SAG Mill, in Proceedings 13th AusIMM Mill Operators’ Conference 2016, pp 321–330 (The Australasian Institute …

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Paper # 25

2018-5-10 · SAG mill, ball mill, ring gear, dual pinion, drive systems, variable speed INTRODUCTION The project is located 15 km southwest of Princeton, British Columbia (BC), an established mining town. The initial exploration at Copper Mountain dates back to 1884. In 1923, Granby

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Manual design of SAG/ball/rod mill foundations ...

 · RE: Manual design of SAG/ball/rod mill foundations youngstructural (Structural) 7 Mar 07 18:27 I have a bit of a long answer here, so I'll give you a synopsis: I don't think an design can be produced manually, and I think a preliminary design could …

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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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(PDF) Breaking down energy consumption in industrial ...

Three SAG/ball mill circuits were surveyed revealing that on average, 91% of the supplied energy results in he at losse s, leavin g on ly 9 % for o re bre akage. The slurry absorbs most of the ...

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Typical Load Factor For Sag Mill Motor

The role of SAG mill grate open area and aperture was evaluated in detail. ... The ore is a granite with significant incidence of magnetite, with typical ball mill work ... A 38 foot diameter by 23 foot (EGL) SAG mill is driven by a 20 MW gearless motor. ... grinding was strongly affected by the amount of critical size in the mill load. Read more

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HIGH INTENSITY GRINDING ISSUE 32 AT ITS FINEST

2017-6-27 · Product News: Ø40’ SAG mill / 6 Case Study: Assarel Medet / 7 Business News: Backfill Specialists acquisition / 11 VPF technology / 12 Product News: Reline Machines / 16 It is a well recognised fact that global ore grades are declining while commodity demands continue to rise. These ore bodies are increasingly complex, requiring a finer grind

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Difference Between Sag Mill vs Ball Mill

The ball charge of a SAG mill is about 29% to 30%. By friction and influence of tumbling balls inside rotating cylinder grinds the raw material to the required fineness. The internal machinery of ball mill grinds the raw material into the powder-like material, And if extreme fineness and refinery are required then rotation go on continue.

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Minerals | Free Full-Text | Optimizing Performance of …

Firstly, there was a serious flaw in the power 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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An electrical impact study between variable speed …

An electrical impact study between variable speed dual pinion mills and gearless mill drives Abstract: Conventional mining process circuits use both Semi-Autogenous Grinding (SAG) and Ball mills. It is very common that the SAG mills are operated with adjustable frequency drives (AFDs) and the Ball mills are operated at fixed speed [1].

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Condition Monitoring of Ball Mill with HD …

There are many different types of mills; ball mills, rod mills, SAG (Semi-Autogenous Grinding) and autogenous mills. In a ball mill, steel or stone balls are mixed with the ore and during rotation of the drum the ore is ground, by friction and compression, into a suitable fineness for the next step in the process.

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