Developments in SAG Mill Design and Operation Over the last few years, SAG mill manufacturing technology has advanced rapidly. The bounds of mill size have been pushed from two directions. Firstly, the advent of ring motors has removed the constraint applied by the power that a
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Developments in SAG Mill Design and Operation Over the last few years, SAG mill manufacturing technology has advanced rapidly. The bounds of mill size have been pushed from two directions. Firstly, the advent of ring motors has removed the constraint applied by the power that a
Optimization of mill performance by using online ball and pulp measurements by B. Clermont* and B. de Haas* Synopsis Ball mills are usually the largest consumers of energy within a mineral concentrator. Comminution is responsible for 50% of the total mineral processing cost. In todays global markets, expanding mining groups are trying
The crushed pebbles fall directly onto the SAG mill feed belt and return to the SAG mill. 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 3032% and 78.5% critical speed.
The ore is ground into a fine powder by large rotating mills. The two types used in the Mission South Mill are called SAG (semi-autogenous grinding) mills and ball mills. SAG mills use larger pieces of ore to break up the smaller pieces (autogenous does it by itself). The larger pieces break down as well.
DCS or SCADA systems control many SAG, rod, and ball mills. These systems are diverse and individualized depending on the equipment and the scope of the system installed. Sometimes youll see simple metrics, like run status, and other times youll see more specific metrics like flowrate or RPMs.
Sep 20, 2018 A Discrete Elements Method (DEM) study of load movement within a SAG mill 12,192 7620 (40 25) in normal operating conditions is performed. The purpose is to determine how the geometry of the lifters affects the kinetics of the load inside the mill. Specifically, the changes produced by the incorporation of inclined lifters and spiral or helicoidal pulp lifters to the kinetics are ...
Vibration ball mill, also known as a vibrating ball mill or vibratory ball mill, is a kind of ball mill machine that uses the high-frequency vibration of the cylinder to make the grinding medium in the cylinder impact the material by inertial force.. Vibration ball mill is a new type of high-efficiency and energy-saving grinding equipment. It has obvious advantages over traditional rotary ball ...
Jun 01, 2005 There are many other solutions however if the efficiency of a SAG mill is not what you are after all of the other options cost more in terms of maintenance and materials (eg. pure ball mills, hammer mills and rod mills). AG and SAG mills are cheap to
Attritor ball mill is a kind of ultrafine grinding equipment with high output and energy saving.. With the development of science and technology, there are more and more applications of ultra-fine powders in industry. From ultra-fine grinding of metal and non-metal raw materials to deep processing of new composite materials, dozens of minerals are processed.
Following the SAG mill will be two 9,000-hp ball mills, each one 20-ft in diam. and 331/2-ft long, that do the finish grinding.How to analyze gear failures. EDM speeds cutting of precision gears. Right-angle gear drives - Zero-Max Inc.The Essentials of Mechanical Systems.
Your problem can occur in a SAG Mill or Ball Mill. Other point to consider is the particle size distribution, it is possible to receive a finer ore from the mine and the particle size distribution of the product from the crushing circuit is different, In this case, the residence time in the tumbling mill tend to be shorter.
Mar 21, 2007 In the past, when primary, secondary and tertiary crushers fed material directly to large ball mills, the energy efficiency of the concentrator was determined for the most part by the ball mill operation, whereas now the energy efficiency of a plant often rests largely on the SAG mill operation.
Jun 24, 2006 Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size. Considering a typical mining operation processes 10,000 to 100,000 ...
Axb values less than 30. A single SABC line was selected for the grinding circuit, with the SAG mill motor rated at 13.4 MW and two ball mills each powered by a 7 MW motor. The plant ramp-up period started in 2006 and in 2009 the design throughput was yet to be achieved. The
Ball Mills and Sag Mill problem AMP Maintenance Forums. Nov 21, 2007 I work in an industrial copper company as vibration analysis supervisor. This company started to work about 2 years ago. We have two Ball Mills and one Sag Mill. We had some visual inspection on pinion and ring gears, during these inspections we found some abnormal wear ...
The crushed pebbles fall directly onto the SAG mill feed belt and return to the SAG mill. 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 3032% and 78.5% critical speed.
In general, the SAG mill manufacturers will control the addition amount of medium such as steel ball at 2-8%, so that the capacity of semi SAG mill to process materials can be increased by 10-30%. The SAG mill liners wear will increase by 15% due to the impact of medium such as steel ball during the SAG mill
Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.
May 28, 2018 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.
Mar 02, 2010 The type of mill discharge and the associated problems in both single stage and multi-stage circuits(AG-Ball-Crusher (ABC) and SAG-Ball-Crusher (SABC)), are briefly summarized in the table below. Material transport Single stage AG/SAG mills have to handle large amounts of slurry as they are generally in closed circuit with classifiers whose ...
Ball Mill Problem The mine experienced repeated failures of pumps used on ball mills to circulate lubricating oil. The unscheduled downtime accumulated quickly. Resulting losses of productivity was averaging 12 hours per event six times a year. Solution
SAG mill and two ball mills in closed circuit with cyclones. Two pebble crushers treat the SAG mill discharge trommel screen oversize material. The crushed product is combined with the SAG mill feed. Project economics dictated maximum throughput through a single line comminution circuit. Hence the selection of some of the largest
Dec 31, 1995 Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size.
Mar 21, 2007 In the past, when primary, secondary and tertiary crushers fed material directly to large ball mills, the energy efficiency of the concentrator was determined for the most part by the ball mill operation, whereas now the energy efficiency of a plant often rests largely on the SAG mill operation.
Mar 02, 2010 The type of mill discharge and the associated problems in both single stage and multi-stage circuits(AG-Ball-Crusher (ABC) and SAG-Ball-Crusher (SABC)), are briefly summarized in the table below. Material transport Single stage AG/SAG mills have to handle large amounts of slurry as they are generally in closed circuit with classifiers whose ...
Axb values less than 30. A single SABC line was selected for the grinding circuit, with the SAG mill motor rated at 13.4 MW and two ball mills each powered by a 7 MW motor. The plant ramp-up period started in 2006 and in 2009 the design throughput was yet to be achieved. The
Optimization of the single stage SAG mill circuit at the ... - zenith. implemented which allowed the SAG mill to operate similarly to a large ball mill and achieve ... by Minera Yanacocha as well as the grinding circuit optimisation study ... operates on a campaign basis when processing copper bearing gold ores. ...
Ball mills are the most common grinding machine employed in the mining industry. Grinding occurs in a single stage, or multiple stages. Multiple stages may include a rod mill followed by a ball mill (two stage circuit), or a semi-autogenous grinding (SAG) mill followed by a ball mill (two stage circuit).
2020-04-11 Ball mill When the particle size of the product is less than 0.5mm, the grinding effect of the ball mill is greater than that of a rod mill of the same specification. SAG mill The SAG mill has a wide range of feeding particle sizes and can process larger minerals, but at the same time, its output particle size is relatively larger.
work indices for the AG/SAG mill and ball mill can be re-organised as 7 and 8, where BWio and AWio are the corrected operating work indices and WAG/SAG, WBM are the respective power draw of AG/SAG and ball mills. Note that the ball mill operating work index is applied only on the portion that needs the additional grinding (Q2),
Optimization of mill performance by using online ball and pulp measurements by B. Clermont* and B. de Haas* Synopsis Ball mills are usually the largest consumers of energy within a mineral concentrator. Comminution is responsible for 50% of the total mineral processing cost. In todays global markets, expanding mining groups are trying
The ore is ground into a fine powder by large rotating mills. The two types used in the Mission South Mill are called SAG (semi-autogenous grinding) mills and ball mills. SAG mills use larger pieces of ore to break up the smaller pieces (autogenous does it by itself). The larger pieces break down as well.
AG/SAG mill is inefficient in grinding particles of a certain size, typically in the range of 25-55 mm, i.e., pebbles. Therefore, cone crushers are often used as pebble crushers and integrated into AG/SAG mill circuits to break the critical size particles that accumulate in the mill and to increase the performance of the primary grinding circuits.
Overview on the grinding mills and their dual pinion mill drives The grinding process with one 34 x 20 SAG mill and two 24 x 39.5 ball mills will be briefly discussed. All three mills are gear driven by a ring gear, dual pinion ...
Nov 01, 2018 The ball-mills in SABC circuits are operated at a relatively high speed (7078% of critical speed), with large balls (50 mm to 80 mm), to cope with a coarse feed (a transfer size from the SAG mill typically larger than 10 mm) and to maximize power draw.
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 ...