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The rubber grates have tapered slots to minimize the plugging with near size particles. Rubber / PolyStl™ grates are extensively used in AG / SAG and Primary ball mills. Polycorp regularly supplies rubber and PolyStl™ grates for mills up to 40 ft in diameter. PolyStl™ Grates. PolyStl™ Grates are suitable for AG / SAG mill applications ...
The load in such a mill typically contains 250,000-450,000 particles larger than 6 mm, allowing correct representation of more than 90% of the charge in Discrete Element Method (DEM) simulations. Most AG/SAG mills use discharge grate slots which are 15 mm or more in width. The mass in each size fraction usually decreases rapidly below grate size.
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.
Jan 08, 2016· In this training module, we'll cover the workings of a semi-autogenous grinding mill, or SAG mill, that's designed to be the first stage of a grinding circuit. Ore that's crushed in a primary ...
Many grates in operation are pegged by grinding media to varying degrees of severity. This paper introduces a comprehensive, accurate and rapid method to measure and track the size and pegging status of each and all grate holes in situ, and therefore provides tracking information on the Open Area of a SAG mill.
Apr 14, 2016· In 2010 Codelco El Teniente's problems with grate piece breakage in their SAG mill resulted in low mill availability and operational instability. Codelco El Teniente worked in close cooperation with to solve the problem. As a result, the next level of Poly-Met discharge grates were taken into use in a SAG mill for the first time.
The initial design of the grate section caused a serious accumulation of pebbles within the SAG mill which contributed to a decreased grinding efficiency. The grates were designed with 18 inner sections, with a 25 mm grate slot width, and 18 outer sections, with only four sections having pebble ports (slot width of 60 mm).
Discharge grates are designed to retain oversize material and balls in the mill, while allowing slurry and pebbles to move on. In 2015, El Teniente claimed record commercial production of more than 71,000 tons of fine copper at one of the industry's lowest cost levels. An increase in slot size and operational stability increased throughput by 7%.
Overflow Versus Grate Discharge Ball Mills: An Experimental Investigation It has been widely accepted to go for grate discharge ball milling when a coarse product is preferred or to avoid production of extreme fines, but overflow discharge mills are preferred .
Water-jet systems, used for returning discharged oversize rock and steel back into a SAG mill, may have to limit the size of material that can be returned. This, in turn, would limit the size of grate slots to prevent the discharge unacceptably large materials. Figure 6 — Outer feed end integral angled lifter-liner (after Veloo et al., 2006a).
Sep 06, 2017· Mill lining optimization increases wear life by 36% at TISCO. Special ore properties have made it very difficult for TISCO Yuanjiacun Iron Mine to find a mill lining that lasts. 's optimized metallic mill lining solution puts an end to years of application testing. Nevertheless, is continuing to improve the solution even further.
description of the hold-up and mass transport in grate discharge AG/SAG mills and the slurry discharge mechanism is still not well ... function of grate configuration. Slot size, position, and ...
Outokumpu Technology's new design, TPLTM is a result of these material transport problems. As the internal design of the TPLTM approximates a grate, peripheral discharge or a grate, open-ended discharge, it keeps the slurry/pebbles away from the grate once they enter the pulp lifter chamber, thus completely eliminating flow-back and carry-over problems.
design is customised to suit your mill size, application and operating conditions. The Vortex design can be fully retrofitted into an existing mill or supplied for new mills. The Bradken Vortex Discharge System: • Provides superior discharge performance for SAG and AG mills • Is ideally suited to high throughput, high solids discharge mills
grates opening in sag mill,grates opening in sag mill grate slot size liner design,with the advent of large diameter sag mills,the mill technology hammer . Contact Us ball mill grate discharge . for ball and SAG mill applications, Ball mill grates limitation on the smallest ball size is the discharge grate slot .
The load in such a mill typically contains 250,000–450,000 particles larger than 6 mm, allowing correct representation of more than 90% of the charge in Discrete Element Method (DEM) simulations. Most AG/SAG mills use discharge grate slots which are 15 mm or more in width. The mass in each size fraction usually decreases rapidly below grate size.
Similar to slurry flow-back, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the pebbles flow down and slide across the grate slots, they get an equal chance to go back into the mill. Similar to slurry pool formation, pebbles flow-back would increase the quantity of critical size material in the mill.
McNICHOLS ® Plank Grating, Interlocking Plank, GRATE-LOCK ®, Galvanized Steel, ASTM A-653, Mill Finish, 14 Gauge (.0785" Thick), Round-End Slot (12" Width), 3" Channel Depth, Two Male Channel Flanges, Male Channel Flange Profiles Interlock with Adjacent Channel Flange Profiles, Slip-Resistant Surface, Long way of Opening (LWO) Parallel to Width of Interlocking Plank, Slots Sheared ...
Turbo Pulp Lifter (TPLTM) - An Efficient Discharger to Improve SAG Mill Performance Sanjeeva Latchireddi Chief Process Engineer Outokumpu Technology Inc. Centennial Co 80112, USA Phone +1 303 792 3110 x224 Fax +1 303 799 6892 Email: sanjeeva.latchireddi@outokumputechnology Key Words: SAG, Grate, Pulp lifter, pebbles, flow-back, carry-over
grate slots, they get an equal chance to go back into the mill as illustrated in discrete element method (DEM) simulation of 36 ft SAG mill pulp lifters shown in Figure 5. Solid particles and coarse pebbles also flow-back through the grates along with the slurry. While flow-back of slurry leads to
SLURRY POOLING AND TRANSPO RT ISSUES IN SAG MILLS ... representative of the whole grate. [slot] all slots mill ... This effect can also be observed when the feed to a mill changes in size
The real number of granular particles is huge in an industrial sized SAG mill. The most challenging task in the simulation of granular flow inside a SAG mill is the grates filtering the ore particles. The grates consist of many small slots and is placed in the intersec-tion of the cylinder-shaped grinding chamber and cone-shaped discharge end.
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 .
SINGLE STAGE SAG/AG MILLING DESIGN Brian Putland 1, Fred Kock & Leigh Siddall1 ... xLoad stability with large rock size and a small mill volume. xPebble extraction rates and discharge designs in the pilot mills. ... first based on the required slurry flow with typical grate and pulp lifter performance and the Effective Grinding Length. 1.
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