SAG Mill Optimisation and Increasing Throughput at the Phu ...
Mill Operators' Conference 2018 29 –31 August 16 Performance Overview Shell liner performance summary Base case Design 2 Design 3 Face angle, deg (vertical) 22 35 30 Liner / Lifter thickness, mm 100 / 300 130 / 340 90 / 320 Discharge system type Radial Curved Radial Grate Open Area / aperture, %/mm 14.5 % / 25 mm 14.5 % / 25 mm 15.6% / 30 mm
SAG Mill Liner Design - Mineral Processing & Metallurgy
To a more significant degree than in other comminution devices, SAG Mill Liner Design and Configuration can have a substantial effect mill performance. In …
Navachab Mine Sag Mill Grate Open Area
Grates For Pella Ball Mill- Aluneth Mining machine. Cone Crusher Wo2013155150a1 Grates Opening In Sag Mill. Grates for pella ball mill navachab mine sag mill grate open area grates for pella ball mill grates can be added to the discharge end of the ball mill …
Ball And Sag Mill Foundation Design
All Mobile crushing line Stationary crushing line Industrial grinding line
Inferential measurement of SAG mill parameters II: state ...
On account of the SAG mill discharge grate characteristics, i.e., high fractional open area (foag), high relative radial position of the open area (γ), and high relative radial position of the outermost aperture (r n), the mill discharge flow is assumed to be only through the grinding media and that no slurry pool exists at the toe of the charge.
Optimizing your SAG mill operation - International Mining
The amount of pebbles passing through the grate increases with the angle of the grate. It is imperative to ensure the efficient removal of both slurry and coarse pebbles (critical size) in order to ensure the efficient operation of AG/SAG mills. Elimination of the above mentioned material transport problems will allow the mill to respond truly ...
بررسی عمل کرد شبکههای تخلیه آسیای نیمهخودشکن مجتمع مسسرچشمه
The results indicated that 1% increase in open area causes 0.4% increase in the circulating load of the circuit. The useful operational time of the grates was found to be 5000 hours beyond which the efficiency decreases. کلیدواژهها: SAG Mill؛ Discharge Grates؛ Open Area
condition monitoring on sag mill
Automated condition monitoring of mill ball size distribution and grate open area, in Kracht, W. and Kuyvenhoven, ... GET PRICE Sag Mill Synchronous Motors - Protable Plant
(PDF) Optimisation of the Sossego SAG mill | Mauricio ...
SAG mill throughput as a function of grate open area As shown in Figure 2 the grate open area has a strong effect on Sossego SAG mill throughput. The nominal capacity of the circuit should be achieved with a combination of 13.5% ball charge and 10.8% open area with 3 and 3.5 inch apertures.
Grate liners | Magotteaux
SAG mills. All grate discharge mills (ROM, primary mills, etc.) Specifications. Grates are manufactured in CrMo (FMU226 type) for AG and grate discharge mills and in High-Chrome for AG mills. Lifters design adapted to avoid overthrowing of balls. Design to best fit to the existing pulp lifters. Downloads.
Improved Relationships for Discharge in SAG/AG Mills
(SAG) mills. In order to optimize this section, the skills to accurately model and understand its underlying mechanisms are required. The literature exposed a clear lack of previous research on the influence and performance of grate/pulp lifter design in AG/SAG mill discharge. The current understanding from
China Mill FE and DE Grate Liner factory and ...
As a casting foundry, H&G Casting also has own SAG Semi-Autogenous Grinding Mill Liner and AG Autogenous Grinding Mill Liner design. In general terms, lifter spacing and angle, grate open area and aperture size, and pulp lifter design and capacity must be considered.
AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator ...
SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
t10 (%) 63 x 53 The "SCSE" Parameter the JK Drop Weight A ...
SAG Mill. o inside shell diameter to length ratio of 2:1 with 15 ° cone angles. o ball charge of 15 %, 125 mm in diameter. o total charge of 25 %. o grate open area of 7%. o apertures in the grate are 100 % pebble ports with a nominal aperture of 56 mm Trommel. o Cut Size of 12 mm Pebble Crusher. o Closed Side Setting of 10 mm
New SAG Mill Model for Better Mine-to-Plant Planning
constant as an empirical function of the open area, grate design, mill speed, charge volume and pulp lifter specifications. Menacho and Chávez (2008) reported a slurry transport model in SAG mills by using the porous media fluid transport theory. Tupper, Govender, Mainza and Neville Plint (2013) reported a …
Open Ended Discharge Grinding Mill - Outotec
Furthermore, the spider and discharge cone are segmented and removable. Together these solutions minimize the time and cost associated with mill relining and discharge-end servicing. Optimized discharge-end serviceability is particularly important for an open-ended mill as the grate design is the primary mechanism to control the slurry pool level.
ARE SAG MILLS LOSING MARKET CONFIDENCE?
Different combinations of SAG mill ball charge and grate open area were tested until 2006. A higher load level was achieved after several changes in the grate design that prevented both liner and grate breakage. Upon resolution of issues related to the mill grate design, the project achieved the target throughput of 41 kt/d. Phoenix
Overflow VS Grate Discharge Ball or Mill - Why Retrofit
The discharge end of the Grate Discharge Ball Mill has at least ten times the discharge opening area, through the grate slots, compared to the common trunnion overflow type mill. The discharge grates are designed to run clean and free of any blinding or choking. The pulp level in the mill may be varied by merely changing the pulp dilution.
Slurry flow in mills with TCPL — An efficient pulp lifter ...
Considering the shortened mill length (from 3.66 to 3.48 m), smaller grate hole size (from 26.8 to 18.5 mm) and reduced grate open area (from 10.47% to 8.16%), the load volume is expected to be more than the pre-installation condition for the same feed rate.
(PDF) Slurry flow in mills: Grate-pulp lifter discharge ...
RPL, 30% charge volume, 7.05% grate open area) Inf lu en ce of charg e vol u me on p erf orman ce of pu l p l ift ers Figu re 10 sh o ws th e infl ue nc e of cha r ge vol u me o n t he disc ha r ...
Mill Ball Mill Sag - lacasinadeinonni.it
SAG is an acronym for Semi-Autogenous Grinding. SAG mills are autogenous mills but 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' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.
Grate Inlet Areas in Storm Sewers - Autodesk Community
For example: If we were designing a site with a 2'x3' grate inlet in a sag my, old job would add the area of slits in the grate to get the open area. We would enter: Grate Width: 2 ft. Grate Length: 3 ft. Grate Area: 2.667 (sqft) When a grate inlet is on grade the Grate Area input was disabled. We we would adjust the grate length and width so ...
Lifters For Ag Mill
Aug 01, 2014· The pulp lifter is an integral component of autogenous (AG) and semi-autogenous (SAG) grinding mills as it controls the throughput, performance and efficiency of mills. The slurry transport from the AG/SAG mill through grate holes into the discharge trunnion is the main function of the pulp lifter.
(PDF) Slurry pooling and transport issues in SAG mills
The slurry transport from the AG/SAG mill through grate holes into the discharge trunnion is the main function of the pulp lifter. ... in which the mill speed, grate open area and the position of ...
Advanced Simulation for Semi-Autogenous Mill Systems: A ...
SAG mills (see Figure 1) are presently one of the most widely used ... Where a i is the open area of all holes at a radial position r i, and rm is the radius of the mill ... efficiency vector, ci (fraction), which includes two effects: one produced by the mill s internal grate and the other by the pulp evacuation system (Magne et al., 1995 ...
Modelling of the Performance of AG/SAG Mills
Transport of slurry through the mill is described by a function which relates the hold-up of slurry, grate design, grate open area and mill speed to the volumetric discharge rate through the grate (Morrell and Stephenson, 1996): Jp = k Q0.5 g-1.25 A-0.5 f0.67 D-0.25 (7) where. Jp = fractional slurry hold-up. D = mill diameter (m)
Vulco Mill Lining Brochure Global - The Weir Group
multiple apertures per grate to large SAG/AG mill applications with integrated reinforcement for structural integrity with open pebble ports for maximum open area. Vulco® mill linings are available for small regrind mills to our extremely specialised "one …
Slurry flow in mills: grate-only discharge mechanism (Part ...
Discharge grates play an important role in determining the performance of autogenous, semi-autogenous and grate discharge ball mills. The flow capacity (grinding capacity) of these mills is strongly influenced by the discharge grate design––open area and position of …
Optimum Critical Speed For Grate Discharge Mills
The role of SAG mill grate open area and aperture was evaluated in detail. ... The SAG mill discharges onto two 12' x 24' horizontal vibrating screens whose ... and grate pebble port sizing resulted in a best overall performance of the circuit. ... 30 Speed, % critical Up to 82 Product, P 80, …
grate open area in sag mills - ecolesaintjeanmonthyon.fr
However in sag mills and in partcular ag mills the grinding media derive from the feed ore, Transport of slurry through the mill is described by a function which relates the hold-up of slurry, grate design, grate open area and mill speed to the volumetric discharge.