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′ () in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill with a 44′ () diameter and a power of 35 MW (47,000 ...
WhatsApp: +86 18838072829The proportion of SAG and ball mills in producing the final product (particles finer than 74 µm) was % and % respectively. That is, the SAG mill produces about % more than the ball mill in the final product. The average consumed energy at SAG and ball mills to produce one ton of final product was kWh/t and kWh/t ...
WhatsApp: +86 18838072829Now I finished the calculation of flowsheet with precrushing, SAG mill and Ball mills. The result is follows: 1. Precrushing three crusher MP2500(Metso) for crushing from 300mm to 50mm. Two working and once in reserve. 2. Primary grinding once SAG mill with size 42ft x 24ft, power motor 28MW. F8050mm, p80 2mm. 3.
WhatsApp: +86 18838072829We have a overflow dry grinding ball mill grated discharge x, we use 40mm,25mm and 17mm ball sizes (high chrome steel) to mill manganese with a top size of 4800um, mill liners are stee... B Last replied to by Dewald
WhatsApp: +86 18838072829This paper describes advances in the operation and control of new SAG mill installations in Australia. The case studies show the difficulties in operability and control of grinding circuits...
WhatsApp: +86 18838072829SAGDesign testing provides SAG pinion energy grindability in kWh/t to within +/ 5% from 152 to mm, and Bond Ball Mill Work Index on SAG ground ore, from the SAG test on the same sample. Starkey Associates uses the patented SAGDesign technology to calculate accurate mill sizes from measurements on a client's own ore samples.
WhatsApp: +86 18838072829Emerson can help you achieve higher availability in SAG and ball mills and high pressure grinding rolls with advanced condition monitoring solutions to detect issues early. Emerson's advanced process control solutions can help optimize your grinding and milling circuits and achieve a more consistent grind while reducing energy consumption.
WhatsApp: +86 18838072829Ball mills, conversely, contain grinding media up to 50mm in diameter, occupying between 25% 40% of mill chamber volume. To effectively reduce material size, each type of mill needs to generate different charge load actions, or the type of motion characterised by the mill's contents. SAG mills generate higher levels of impact reduction and ...
WhatsApp: +86 18838072829Measuring filling is also necessary to estimate the composition of the load for mill modelling: rock and slurry for AG mills; rock, balls and slurry for SAG mills; or balls and slurry for ball mills. In the case of SAG mills, this requires two separate filling measurements: one for a crashstop and one following a complete grindout to quantify ...
WhatsApp: +86 18838072829SAG Mill Trommel Screen. A SAG Mill trommel screen lets you control the true discharge size of your SAG mill or the transfer size to the downstream Ball Mill circuit. In the image case below, strangely enough, Metso is the mill shell liner and discharge grate manufacturer. The grates it provides to this Cu/Pb/Zn operation are 15mm X 30mm.
WhatsApp: +86 18838072829• 22 MW GMD for 28' ball mill • 28 MW GMD for a 40' SAG mill • 28 MW GMD for 42' SAG mill Whether it is size or an installation at the highest altitude (4600 ), ABB's GMDs are well positioned to contribute to the building of larger and ever more powerful mills. — Leading the gearless mill drive evolution
WhatsApp: +86 18838072829Measuring filling is also necessary to estimate the composition of the load for mill modelling: rock and slurry for AG mills; rock, balls and slurry for SAG mills; or balls and slurry for ball mills. In the case of SAG mills, this requires two separate filling measurements: one for a crashstop and one following a complete grindout to quantify ...
WhatsApp: +86 18838072829Open gland water valve to the appropriate cyclone feed pump. Put density controller on MANUAL mode and set the output to 20%. Set the setpoint to 5055% solids. Start the appropriate cyclone feed pump. Put flow controller in MANUAL mode and set output to cubic meters/hour (60% controller output). Start ball mill motor (clutch disengaged).
WhatsApp: +86 18838072829to an industrial semiautogenous (SAG) mill in Craig and MacLeod (1995, 1996), and the linear model predictive control for an industrial ball mill circuit in Chen et al. (2007). A robust nonlinear model predictive controller (RNMPC) was proposed by Coetzee et al. (2010) to control a ROM ore milling circuit. Full state feedback was assumed.
WhatsApp: +86 18838072829Feed Tracking: Accurately controls the number and weight of balls entering the mill and keeps an uptodate inventory of the balls in the mill for more efficient operational control. InMill Tracking : Simulation of grinding media size distribution inside the mill, as a function of ball size, discharge size (grate slot), daily charges and ...
WhatsApp: +86 18838072829The larger units can also be matched with the SAG mill in SAB/SABC configuration. Stirred mills (Regrinding). Finer regrinding or ultrafine grinding is a frequent requirement in pilot plants and ALS has a range of units that can run continuously in pilot applications. The following mills are located at Balcatta: ISAMill tm, Deswik, and ...
WhatsApp: +86 18838072829After extraction in the openpit mine, the ore is crushed in a huge 40foot semiautogenous grinding (SAG) mill and two 27foot ball mills, all three of which are driven and controlled by ABB gearless mill drive systems with a massive power output of and megawatts respectively.
WhatsApp: +86 18838072829By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ballmill circuit feed is maintained while still unloading the SAG circuit (Mosher et al, 2006). A variant of this method is to direct pebblecrushing circuit product to the ballmill sump for secondary milling: while convenient, this has the ...
WhatsApp: +86 18838072829The Mill Control System provides all control functions required for the safe operation of grinding mills and their associated lubrication systems, as well as continuously monitoring the equipment's condition. ... The Tube Mill Reline Machine is a compact relining solution for smaller SAG and ball mills. Mill equipment transporter.
WhatsApp: +86 18838072829SAG Mill Process Control What do you prefer? Controlling Weight (within a range) by manipulating mill speed and keeping a constant feed rate? Controlling weight by manipulating feed rate? Oberstorm 8 years ago Like Where do you see maximizing throughput subject to load maximum and upstream/downstream process constraints? Marshal Meru 8 years ago
WhatsApp: +86 18838072829In large capacity SABC circuits operating at high SAG mill ball load, ball mill capacity is often a limiting factor. Figure 1 IMPACT OF FEED SIZE ON SAG MILL SPECIFIC POWER FOR ORES OF MODERATE TO HIGH COMPETENCY. To counter high ore competency, the ball to rock ratio can be increased and/or the ball size increased.
WhatsApp: +86 18838072829Relation between Sag mill solid and product P80! Both are dependent on feed size. Dependent on Volume % solids in SAG mill. Dependent on ball charge volume. Hardness of ore. Recirculation load. Dependent on P80% size. All other parameters are secondary. In general Sag mill solids are kept at 70% by wt. Operating grinding circuit is an art.
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