(EGL) SAG mill driven by a 24,000 kW gearless drive. The SAG mill feeds two FL ball mills each 26 ft. in diameter × 40 ft. long (EGL), each driven by a 16,400 kW drive. The SAG mill is one of the largest volumetric capacity SAG mills in the world and represented the first 40 ft. SAG mill in Peru (Garcia & Villanueva, 2013 [1]).
The main grinding circuit at Les Mines Selbaie consists of two mills, one SAG mill in closed circuit with an 8' x 20' vibrating screen with 700 micron deck, and one ball mill. The SAG mill is 8.23m (27') diameter x 3.75m (12.3') long. The Holt-McDermott grinding circuit uses a large primary SAG mill which is 5.03m (16.5') diameter x
operating cost and reduce availability of ball and SAG mills. Options for variable speed are DC motors, energy recovery systems for wound rotor motors and frequency converter …
The single line grinding circuit at Bond Gold's Colosseum mine consists of variable speed drive semi-autogenous (SAG) milling and secondary grinding with a fixed speed ball mill. There are several advantages and disadvantages of operating SAG mills with variable speed drives. Discussion in this paper will focus on the effects of variable ...
For economy of scale, new projects consider grinding circuits with SAG and ball mills with 36′ or larger mill diameters with cycloconverter-fed drives with powers in the range near 20 MW.
Frozen Charge incidents on their 16MW ball mill during initial phase of production in the years 2009 and 2010. This was often combined with overload of the mill.
SAG mills have a power higher than 10 MW. Even ball mills have a power larger than 10 MW. For this reason, they have an important impact in energy consumption and in the operation of the power distribution system. Figure 1. Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous motor.
a technical paper on the occasion of the SAG 2006 in Vancouver, B. C. Canada: "Lessons learnt from recent failures of gear drives on mills in South Africa" This study came up …
issues with the gearless drive and trommel panel failures. ... mill motor issue and frequent trommel panel failures contributed to 2.5% ... on historical operational data of a SAG mill, ball mill ...
Understand the Difference Between Ball Mill vs SAG Mill. In conclusion, ball mills and SAG mills are both essential in the operation of any mineral processing facility. They both reduce particles in size by using different sizes of grinding media, and have differences in cost, efficiency, and use in regards to application.
drive to sag mills Mining. Apr 13, 2021· to Design and Supply the World's Largest SAG . has been selected to design and supply a 42ft x 25ft, (12.8m x 7.6m) 28MW gearless SAG mill, plus two 26ft x 42ft, (7.9m x 12.8m) 15.6MW ball mills and two VTM-1500-WB VERTIMILLS® for Newmont Mining's Yanacocha Conga copper-gold project …
Laguna Seca concentrator uses a SAG mill and three ball mills, all driven by gearless mill drive (GMD) systems. Table 1 gives an overview of the basic technical data of the installed drives. TABLE I. MILLS AND THEIR DRIVES IN THE LAGUNA SECA PLANT Equipment Drive Comments SAG Mill (Semi-autogenous Grinding) Quantity : 1 unit
Am sure your Ball Mill is considered the finest possible grinding mill available. As such you will find it is designed and constructed according to heavy duty specifications. It is designed along sound engineering principles with quality workmanship and materials used in the construction of the component parts.
The report outlines the path Siemens and OK Tedi Mining undertook together from - the initial stages of the drive train Audit in 2014 to - the subsequent definition of the scope and reasons for ...
Sag Mill is a kind of heavy duty equipment used in the ore crushing and grinding industry. Its working principle is to utilize the impact and grinding effect of a small amount of steel balls and the material itself to crush the ore Through the rotation of the cylinder, large pieces of ore are gradually broken into smaller particles in the collision …
includes a Bond Ball Mill Work Index test on SAG ground ore from the first stage of the test. The ratio of SAG pinion energy to Bond BM Wi is a key parameter in a SAG mill grinding circuit design, because this ratio controls the power split between SAG and ball mills at the target T80 transfer size( ). INTRODUCTION
ABC closed circuit, Autogenous-Ball-Mill-Crusher. Another similar technique is the ABC open circuit where the crusher product feeds the ball mill rather than the autogenous mill. Crusher product is typical feed to a ball mill using large diameter balls but not much grinding of 20-25 mm ore can be accomplished in an autogenous mill.
BALL & SAG MILLS WITH THE REXNORD® AUTOGARD® TORQUE LIMITER AND FALK V-CLASS® GEAR DRIVE INDUSTRY: Mining APPLICATION: Ball and SAG mills …
Rely on our proven track record of AG and SAG Mill superiority. Since the early 1980s, we have been designing and manufacturing Semi Autogenous Mill (SAG Mill) and Autogenous Mill (AG Mill) under the Fuller-Traylor brand. Semi-autogenous grinding uses a minimal ball charge in the range of 6-15% while autogenous grinding uses ore only.
Paper held at SAG Conference 2011 - By S. Gaulocher (ABB), K.S. Stadler (ABB), Th. von Hoff (ABB), R. Veldsman (ABB), A. Fuerst (ABB) and J. Koponen (ABB): Gearless mill drives (GMDs) are the workhorse in the mineral processing industries, more specifically when it comes to grinding crushed ore and cement (in various production stages) in …
Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pin-ions, 3.7 MPa (5000 hp). The exception to this design was the Hibbing …
Mill in Brazil and Lumwana having a 38ft, 18 MW SAG and one 26ft, 16 MW Ball Mill in Zambia, all three mills put in operation in 2008, as well as Los Bronces, Confluencia in Chile equipped with one 40ft SAG Mill of 22 MW and two 26ft Ball Mills of 16.4 MW commissioned in 2011. In the light of increasing interest in that technology various ...
For economy of scale, new projects consider grinding circuits with SAG and ball mills with 36′ or larger mill diameters with cycloconverter-fed drives with powers in …
A variable speed medium voltage drive system from Ingeteam was set to drive the SAG mill including an MV transformer, MV frequency converter and an MV squirrel cage induction …
"SAG mills are particularly high consumers of energy and, as a result, there has been a push to improve their energy efficiency." One example of this trend is the use of improved mill drive technologies, e.g., the use of gearless mill drives (for large SAG mills) or of large, geared drives with low synchronous motors
Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option of operating at higher ball …
Variable Speed, Variable Speed Drive, Semi-autogenous mill, Ball mill, efficiency, drive system . ... (SAG) and ball mill circuits. This progression, - however, has not always been accompanied by an improvement in the efficiency of power usage in achieving the target grind size. According to the Coalition for Eco-Efficient Comminution (CEEC),
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In this example the SAGDesign (SDT) ore hardness is 10 kWh/t (to grind the ore from F 80 152 mm to T 80 1.7 mm) and the SAG ground Bond Ball Mill Work Index is 15 kWh/t. Table 2 shows alternate equipment selections that will produce 471 t/h, (10,400 t/d and 3.8 million tonnes per annum) at 92% availability.
Equipment such as Semi Autogenous Grinding (SAG) mills, ball mills, pebble mills and rod mills are some of the largest rotating equipment in mines that produce metals or industrial products such as cement. ... A failure of the inching drive brakes can be deadly, which is why proper safety guards need to be in place. It is also good practice …
remedial measures [1,2]. The causes of both the SAG and ball mill drive faults were related to the stiffness of the drive components. During this work, the characteristics of the SAG mill system were measured. The resonant frequency of the foundation was determined using an amplitude decay technique. Vibrations in the SAG mill stator
Just like a bloated stomach, if the amount of grinding exceeds the maximum capacity and discharge capacity, it will cause the mill shell to loses its grinding capacity, and that's why we call it "swollen belly".
next size Gearless Mill Drive, i.e. a 42ft mill. It is a dual design approach considering, on the one hand, the experi-ences Siemens made with Gearless Mill Drive (GMD) instal-lations over the past 40 years and, on the other hand, using computerized design tools calculating the system behavior where experience does not yet exist.
This paper describes the function and operation of lubrication systems for Ball Mill and SAG Mill Drives. Provided within this paper are hydraulic schematics, functional description and a general overview of system layout as well as some of the important features and factors relevant to improving the reliability of this very critical part …
Sag And Ball Mill Drive Failures. WhatsApp. sag and ball mill drive failures . Ring gear drives huge grinding mill | Mechanical Drives content from . 1 Mar 2000 Following the SAG mill will be two 9,000hp ball mills, each one A ring …
Semi-autogenous (SAG) mill total load and ball load have a marked influence on mill performance. Direct measurement of these inventories is difficult, hence inferential measurement is an ...