intermediate size ready for final grinding in a ball mill pebble mill or VERTIMILLTM Wet grinding is accomplished in a slurry of 50 to 80 percent solids AGSAG mills 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 of a ball mill
Volumetric loading is similar to that of a ball mill 3035 Design standards for drive components are more demanding than ball mills Dry applications feature a peripheral discharge or an airswept arrangement Typical operating speeds are slower than either SAG or ball mills 6570 TCS wet and 6263 TCS dry
Very large tonnages can be ground with these ball mills because they are very effective material handling devices Ball mills are rated by power rather than capacity Today the largest ball mill in operation is 853 m diameter and 1341 m long with a corresponding motor power of 22 MW Toromocho private communications
SAG is an acronym for semiautogenous 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 The largest SAG mill is 42 128m in diameter powered by a 28 MW 38000 HP motor
JKSimMet SAG screen ball mill and hydrocyclone models w ere calibrated based on survey data collected in July 2009 mass balance results plant operating data ore c haracterisation
Metso has experience of over 8000 grinding mills globally including manufacturing and delivering the largest SAGAG mills in the world Our experts welcome the opportunity to assist you with circuit and circuit control design as well as startup operation and optimization of your mill
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 66 m111 m internal diameterlength each with a 97 MW twin pinion drive The ball mills are operated at a ball charge volume of 3032 and 785 critical speed
The mill discharge from these mills consists of slurry which goes to the ball mills for further grinding and coarse pebblesrocks which are crushed and sent back to the mill To maximize the capacity of these circuits the general practice is to use grates with pebble ports reaching 100 mm instead of normal grate openings to increase the
The original Phu Kham grinding circuit comprised of a SAG and a ball mill in SAB flowsheet arrangement each with 13 MW of installed motor power The circuit targeted a cyclone overflow grind size of 106 um and an average flotation recovery of 85 In 2012 a second ball mill and additional flotation capacity were
mills with the rod mill and ball mill laboratory work indices Note in Figure 1 that the rod mill product slope is less than 05 due to an extra amount of nes present being ner than 650 m These nes proceed to the ball mill improving the ball mill ef ciency Also the plotted rod mill P80 value as shown in Figure 1 is 2900
The ball impact energy on grain is proportional to the ball diameter to the third power 3 E K 1 d b 3 The coefficient of proportionality K 1 directly depends on the mill diameter ball mill loading milling rate and the type of grinding wetdry None of the characteristics of the material being ground have any influence on K 1
Most mills used in mining rely on impact to breakdown rock to a suitable size for downstream processing The impact can be rock on rock such as in an Autogenous Grinding AG mill rock and a small ball charge 10 used in Semi Autogenous Grind
Please find below two calculators for sizing mills using the Bond and Rowland methods Ball mill sizing Calculator for ball mills in a single stage circuit Rod ball mill sizing Calculator for rod mills as first stage of the circuit and ball mills as second stage of the circuit
Attrition mill is a type of grinding mill by kinds of media to crush lump to powderlike substances The impact can be rock on rock such as in an Autogenous Grinding AG mill rock and a small ball charge 10 used in Semi Autogenous Grinding SAG mills balls of various sizes in Ball Mills and less commonly these days steel rods in Rod Mills
Large diameter ball mills offer advantages in capacity and relative cost but serious diameter limiting situations can occur The authors describe conditions that determine whether scaledup mills
intermediate size ready for final grinding in a ball mill pebble mill or VERTIMILLTM Wet grinding is accomplished in a slurry of 50 to 80 percent solids AGSAG mills 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 of a ball mill
Axb values less than 30 A single SABC line was selected for the grinding circuit with the SAG mill motor rated at 134 MW and two ball mills each powered by a 7 MW motor The plant rampup period started in 2006 and in 2009 the design throughput was yet to be achieved The
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
Mill throughput is a key driver for maintaining profitability at Mt Keith because of the low head grade 05 Ni and inherently low nickel recoveries due to the mineralogical makeup of the ore The Nickel West Mt Keith Concentrator NMK has 2 parallel grinding modules consisting of one SAG Mill and one BALL Mill per module
Antamina Compania Minera Antamina SA Peru Project One SAG Mill and 3 Ball Mill Drive Systems Capacity SAG Mill 1000 th Ball Mills 1000 th Consultant Bechtel USA Mill Builder FFE Minerals USA Mill Size SAG Mill 38 feet1158 m Ball Mills 24 feet732 m Ore processed CopperZinc Drive Rating SAG Mill 201 MW 923 rpm Ball Mills 112 MW 1138 rpm
sag mill ball charge calculation Improved Relationships for Discharge in SAGAG Mills UQ eSpace TABLE 32 PEBBLE PORT DISCHARGE REGRESSION EQUATION mills such as ball mills and SAG mills Musa and Morrison 2009
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 336 268 Lakeshore Rd E Oakville Ontario L6J 7S4
PRESS RELEASE COPENHAGEN DENMARK FLSmidth to supply crusher SAG mill and ball mill to copper mine in Serbia Chinese mining company Zijin Mining Group Company Limited has chosen FLSmidth to provide a gyratory crusher SAG mill and ball mill to the Majdanpek mine which forms part of their newly purchased Zijin Bor Copper mine group
SAG milling at the Fimiston plant KCGM coarse ore stockpile with a live capacity of 30000 tonnes The SAG which over looks the SAG mill and the ball mills to produce a grinding
size ball load mill speed and solids will represent the total load Ball Mill SAG Mill Scw Jb Pc 6 1 NNc Fresh Feed Water Water Pebble Crusher Screen Cyclones Sump Pump Fig 1 SABC AB milling circuit Scw solid concentration by weight fraction in the SAG mill feed Jb balls charge bulk fraction of the SAG mill volume NNc
mill As such primary ball mills should be designed with the rod mill work index and singlestage ball mills should be with both the rod mill and ball mill indices This is because it is common to observe a difference sometimes significant between the rod mill and ball mill index values for a given ore type McKen Verret Williams 2006 On
The Prediction of Power Draw in Wet Tumbling Mills In total 76 data sets were generated covering the power draws of ball SAG and AG mills in the range 7 7900 kW SAG mill has a
Based on experience millliner designs have moved toward more openshell lifter spacing increased pulp lifter volumetric capacity and a grate design to facilitate maximizing both pebblecrushing circuit utilization and SAG mill capacity As a guideline mill throughput is maximized with shell lifters between ratios of 251 and 501