SAG mills (semi autogenous grinding mills) 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
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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
Conical Ball Mills differ in mill body construction AG mills or SAG mills Figure 8 11 Ball mill external appearance and internal view Ball mills are filled up to 40 with steel balls (with 30–80 mm diameter) which effectively grind the ore The material that is
Metso’s delivery consists of the primary crushing station with a Nordberg C160™ jaw crusher one SAG mill and two ball mills with a total installed power of than 20 MW The circa €25 million ($27 million) order has been booked in Metso’s March quarter orders received with delivery expected to take place in the first half of 2021
AG SAG Mill Liners We have supplied rubber pulp lifters for SAG mills up to 40 ft in diameter We are pioneers in the design of both radial and curved pulp lifters also design and manufacture Rubber PolyStl™ grates and discharge systems
Ball mill gear lurication problem Ball Mill Shanghai Minggong ball mill gear lurication problem Oil analysis this shows amount of silica is very much Innovative Gear Drive Solution for Grinding Mills Both the SAG mill and ball mill are each driven by two gear units Because
Nov 19 2019 The finesse of the material milled by the ball mill is 0 074mm 0 4mm only except for the two small ball mills that have a wider range of 0 075 0 89mm However the rod mill fine grinding fineness is about 0 833 0 147mm In terms of the fineness of the ground material the ball mill
The style of a SAG mill liner is driven by the material of building and construction and also the application as well as limited by casting molding and taking care of constraints For huge mills with wide inlet trunnions in excess of 1 5 m liner handling types of equipment are currently in common usage and also this has actually permitted the development of large integral liner blocks
Modification of SAG mill liner shape based on 3 D liner May 16 2009 The oversize material is recycled to the SAG mill and the undersize is combined with the ball mill (6 71 9 91 m) discharge and is sent to the cyclones The SAG mill uses two 5500 hp synchronous motors and works with constant 10 5 rpm rotational speed in two directions
There are two lines consisting of this SAG ball mill combination where the SAGs are denoted as SAG1 and SAG2 Note Each SAG mill is operated in a closed circuit manner in conjunction with a typical trommel screen and pebble crushing circuit The ball mills are also operated in a closed circuit employing two hydrocyclone separators The
The SAG mill trommel screen provides a simple mechanism to classify large volumes of mill product Many designers and mill operators believe that the benefits of simplicity and the ability to handle throughputs in excess of 5 000 tph of solids make trommels the preferred equipment for this application
As the diameter and length of mills increased several critical problem areas were ident911metallurgist com Difference Between Sag Mill vs Ball Mill mech4study SAG mill make use of steel balls included with some large and hard rocks for grinding These mills utilize the balls in making the large fragments of materials broken into pieces
One of our Ball Mills keeps losing pressure on the high pressure pump It will run fine when starting the Mill and suddenly after a while sometimes 1hrs the pumps will loose pressure We have just grinded the journal and installed new white metal bearings After startup this afternoon after about 1h
Apr 09 2015 Grinding Mills and Their Types satyendra April 9 2015 0 Comments autogenous grinding ball mill grinding mills hammer mill rod mill roller mill SAG Grinding Mills and Their Types In various fields of the process industry reduction
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
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 in terms of maintenance and materials (eg pure ball mills hammer mills and rod mills) AG and SAG mills are cheap to
Sag And Ball Mill Drive Failures vierbeinerei de Sag mill gear failure sag and ball mill drive failures sag mill drives girth gears at 18 000 hp sag mill drives girth gears at 18 000 hp operation and performance this paper was originally presented at the vancouver sag mill conference in 1996 reducing the fatigue life of a girth gear girth
Autogenous sag mill via an utilized method miduk copper concentrator is located in kerman province iran and its size reduction stage includes one gyratory crusher which feeds one sag mill 975 diam388 lengthm following two parallel ball mills 5diam7lenghtm after sag mill a detail 100 and 125mm sag mill using forged steel balls
Tools for Improving Maintenance strategies and 2020 6 16 Practical Problem Solving (PPS) Practical Problem solving is an extension of the 5 why proce maintenance problem solving and ball mill 27 Division mirpur 12 pallbi
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 to the largest sag mill is M in diameter powered by a mw hp motor a sag mill with a M diameter and a power of mw hp has been
“Oyu Tolgoi” LLC (the 'Company') would like to invite potential experienced suppliers to submit their Expression of Interest (EOI) in relation to supply of “SAG and BALL mill relining shutdown support” [An EOI is only a preliminary step to a formal tender process to understand and identify whether there are potential suppliers in the market that are interested in and capable of
SAG Ball Mill Optimization KnowledgeScape Even though production was dramatically improved the product size of the secondary ball milling was reduced and recovery increased The results in SAG Mill line 2 are even dramatic Because of segregation on the coarse feed stockpile SAG mill 2 receives a higher percentage of coarse material
Outotec books order for SAG and ball mills at Mexico zinc Outotec books order for SAG and ball mills at Mexico zinc operation SAG mill and a ball mill The deliveries will take place in 2021 and production is expected to begin during the same year “Our unique grinding technology such as the Outotec 174 Polymer Hydrostatic Shoe Bearing HSB system will provide excellent benefits to the plant
Sep 03 2014 Strain gauging of shell mounted mills has been undertaken in the past Some results have been published in SAG mill conferences Strain gauges were also used to check the design of the CMDIC shell mounted ball mills The statement in [1] that shell mounted mills have not been thoroughly tested is incorrect CONCLUSION
On SAG Mill Lube Oil Return Lines Crushing systems such as SAG Mills AG Mills Ball Mills Gyratory and Cone Crushers are extensively used throughout the hard rock mining industry In these systems Labyrinth seal related problems leading to water ingression are intermittent and are therefore hard to detect A large Australian gold mine was
Large scale SAG mills especially with the wide application of the SABC (Semi autogenous ball mill crusher) process concentrators across the country have begun to use large scale SAG mills [2 3] However while the working method of the SAG mills brings convenience to the beneficiation process it also brings great constraints
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
A) Total Apparent Volumetric Charge Filling – including balls and excess slurry on top of the ball charge plus the interstitial voids in between the balls – expressed as a percentage of the net internal mill volume (inside liners) B) Overflow Discharge Mills operating at low ball fillings – slurry may accumulate on top of the ball charge causing the Total Charge Filling Level to
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 23 2020 Grinding mills including SAG (semi autogenous grinding) mills and ball mills consume approximately 60 70 of the total energy cost of the entire mining operation The mills are installed with large motors up to 20+MW which impart the required energy to successfully process many tonnes per hour and grind the rock to a powder size suitable
In some plants the performance of large diameter ball mills is not as efficient in energy consumption as predicted from the performance of laboratory and pilot plant ball mills Ball mill scale up
