Title: SAG & Ball Mill Case Study of BioKem 1 SAG Ball Mill Case Study of BioKem 2 The Problem. Our client experienced a significant water and debris contamination event in the Fixed Bearing circuit of the SAG Mill. The mill was immediately shut down to avoid bearing damage and the contaminated oil was removed and new then oil introduced. 3

An increase of over 10% in mill throughput was achieved by removing the ball scats from a single-stage SAG mill. These scats are non-spherical ball fragments resulting from uneven wear of balls with included porosity. 30t of scats were removed from a total charge load of 70t. Surveying and modelling the mill revealed that the breakage rates

Series of batch tests were carried out to investigate different mill grinding conditions and acoustic emissions. The grinding conditions included no load, different percent ball loading (5, 8, and 10 vol%), different rock mass loading (500, 1000, and 1500 g), different water volumes (500, 1000, and 1500 ml), mixture of steel balls-water, steel …

Maximum availability and productivity Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. ABB's GMD is the most powerful mill drive system in the …

Mill Operators' Conference 2018 29 –31 August 3 Phu Kham Comminution Flowsheet • Primary Crusher CSS ~ 110 mm • 34 ft x 18 ft (EGL) SAG mill, 13 MW • Two 24 ft x 38 ft (EGL) ball mills, 13 MW each • SAB circuit • SAG mill limited • High diorite and skarn feed • Circuit grind ~ 106 μm • Theoretical maximum comminution circuit

a given issue for a gearless drive system. A harmonic study determines on a case-by-case basis whether the plant configuration and network in question need harmonic filtering. As the drive concept is a 12-pulse system, only the 11th and the 12th harmonics and their related sidebands have to be looked at. Harmonics with higher harmonic

SAG Mill Control . SAG mills can be optimized for maximum ore throughput or maximum grinding energy efficiency. In both cases, precise control of the mill filling percentage is critical (Wills and Napier-Munn, 2006). Maintaining constant mill weight, as indicated by bearing pressure, is one approach to stabilize the mill

The analysis of the influence of ball sizes in SAG grinding hasn't been developed in detail by considering the effect on process parameters inside the mill, grinding efficiency or internal classification. Historically a conventional grinding reference has been made on the empirical procedure developed by Azzaroni (1980).

This paper describes the function and operation of lubrication systems for Ball Mill and SAG Mill Drives. Provided within this paper are hydraulic schematics, …

SAG Mill and Ball Mill Case Study. In September 2011, the company Outotec, located in Espoo (Finland), awarded Ingeteam a contract for the design and supply of the main …

The first Gearless Mill Drive (GMD) with a power of 6.5 MW was installed 1969 in a cement milling process in the cement plant Le ... The question what drive system is optimal for SAG and ball mills is project specific and depends on the plant layout and the design of the grinding circuit. When drives systems are compared the main

The SAG mill power draw model of Austin (using the calibration by Doll, 2013) is used to predict the process power draw at the mill shell, P shell, and the efficiency losses for the drive's ...

SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill with a 44 ...

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 ore type throughput is 8,160 dry tons per day (340 dtph).

In this cas e study of a 32-foot (ft) variable-speed SAG mill, the ball charge was know n to be relativel y constant across a six - month period, which c oincided wi th a shell lifter – liner ...

According to the single parameter study of the SAG mill in Section 3.1, the optimal fracture interval of the mill speed ratio, mill fill level ratio, and steel ball ratio is obtained. The basic case of SAG mill mixed parameter research is composed of the optimal fracture interval of a single parameter.

mentioned some case studies of using good liner designs. For example, the initial SAG mill liner was installed using Hi-Hi with a 6. o . contact angle. Mill throughput increased by 11% after the face angle had been altered to a 17. o. angle and then to a 30. o. angle. Currently, the large face angle (typically 20. o . up to 30. o

ROTECT EQUIPMENT AND REDUCE DOWNTIME AT BALL & SAG MILLSThe Falk V-Class® Gear. rive is the standard in gear drives from Regal RexnordTM. The Falk V …

Title: Copper Concentrator - SAG & Ball Mill Case Study 1 Copper Concentrator - SAG Ball Mill Case Study 2 The Problem. Our client experienced a significant water and debris contamination event in the Fixed Bearing circuit of the SAG Mill. The mill was immediately shut down to avoid bearing damage and the contaminated oil was removed and new ...

SAG mill increases productivity, reduces ... DIN 51 350 pt. 4 4-ball weld load 4,800 N SRV oscillating wear tester, 300 N load, 1,000 µm elongation, 20 Hz, ... Case study: MOLYKOTE® P-74 Assembly Paste aids in prevention of liner bolt failures by reducing friction from tensioning of critical parts

AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the basis for a variety of circuit configurations. SAG circuits …

Ball Sag Mill Drive Case Study ball sag mill drive case study Mill drives the desire for increased power and the 2021-9-11 The standard method for sizing secondary ball mills (usually the overflow type) in AG/SAG circuits follows published mill supplier information with aspect ratios in the range 11.5 to 12.0, depending upon product …

The design of the 40-foot diameter SAG mill installed at the Cadia Gold Mine, New South Wales Australia, followed after two years of extensive laboratory and pilot plant testwork. This showed the Cadia ores to be hard and competent necessitating the use of both a variable speed mill drive and pebble crushing. The grinding power requirements were …

Download scientific diagram | 4. SAG Mill, Ball Mill and Floatation Source: PT Freeport Indonesia, 2017. from publication: Design of Information Management for Environmental Performance Management ...

SAG mill, 40 ft, 42 ft, gearless mill drive, GMD, SAG manufacture, reliability ... The results of these studies showed that a single line 40 ft SAG mill circuit gave the best project ... Ball Mill External Weld Design Cadia 6.7m 37.8 MPa 14 years Conga 7.26m 38 MPa * -

results obtained from case studies where optimisation of mine to mill processes were conducted. INTRODUCTION The JKMRC has developed and applied tools to explore ways of improving overall mine to mill

A typical circuit, as shown in Figure 2, can consist of either an Autogenous (AG), Semi-Autogenous (SAG) combined with a ball mill. In an AG mill no grinding media is added, while in SAG mills the charge is supplemented with steel balls. As more steel balls are added the transition from a SAG to a ball mill occurs.

The grinding circuit consists of a SAG mill and two ball mills, all dual pinion gear driven. Copper Mountain has selected the state-of-the-art dual pinion mill drive systems, …

The circuit consists of a 34' x 20' EGL SAG mill, a Raptor 900 pebble crusher and two 24' x 39'6" ball mills. Each mill is equipped with a 2 x 8500 HP dual pinion drive system. The plant was designed to process 1585 mtph of SAG feed. From startup, the mill struggled to meet the required production rates.

Customer: Gold mine (Canada) Background Our client was investigating avenues to reduce operating costs for its SAG mill. When it comes to SAG grinding media, concentrator operations are needed to effectively balance wear and breakage resistance. Our client approached us with hopes of reducing SAG grinding media consumption without …