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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 for their simplicity of .
stage of grinding. A 4.7m x 7.5m Outotec grate discharge ball mill with an installed power of 2.6MW and Turbo Pulp Lifters is operated in closed circuit with 250mm cyclones to provide a 45 m product to flotation. The primary mill was initially commissioned as an Autogenous Grinding (AG) mill. During
of grate/pulp lifter design in AG/SAG mill discharge. The current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate at various aperture sizes and radial positions. It also indicates that in
discharge pump (grate and pulp lifters) is operating. Similar to the impeller design affecting the pump capacity, the pulp lifter design affects the discharge capacity (or mill throughput) of the SAG/AG grinding mills. The general arrangement of AG/SAG mills discharge system is shown in Figure 1. BREAKAGE DISCHARGE
The commercially viable and industry accepted alternate is a grate discharge trunnion supported mill or a grate discharge shell supported mill using pulp lifters. The only way to eliminate the problem of flow-back and carry-over of slurry and pebbles is by optimizing the design of the discharge arrangement.
of overflow-discharge mills but not to the same extent in grate-discharge mills. This pool is situated more or less symmetrically with respect to the axis of the mill and therefore does not draw significant power. Austin recommends K = 10.6 for overflow semi-autogenous mills. A value of K = 9.32 makes Austin's formula agree with Morrell's data
In simple words, grate discharge mills give higher tonnage, but produce coarser grinding, that may cause problem in your Flotation recovery, Grate discharge will also reduce your EGL. The best option would be to place a retainer ring at discharge end to hold more charge & that will give you more throughputs without compromising grind size.
Grate-discharge Type The grate-discharge type of Ball Mill has a grate at the outlet of the shell and causes less excessive grinding, compared to the overflow type. Therefore, generally, it is best suited to grind materials up to the particle sizes ranging from 60 to 100 mesh. Compartment type
oututec grate discharge sag mill . Overflow VS Grate Discharge Ball or Mill Why Retrofit Allow me to compare: Ball mills can be of the overflow or of the grate discharge type. Get Price. Grate Ball Mill Ball Mill,Ball Mill Supplier,Ball Mill For .
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 ...
Outotec® Grinding technologies With over 100 years experience in grinding technology, Outotec is one of the largest mill suppliers in the world. Outotec's dedicated team of grinding specialists provide design engineering, testing and analysis in order to select the mill best suited to .
Metallurgical ContentTypes of Ball Mills Ball Mill GrindingExample of Plant Capacity GainsBall Mill SpecificationsCompare Type of Mill DischargeGrate Discharge Ball Mill CapacitiesGrate Discharge Ball Mill Arrangement & Dimensions Allow me to compare: Ball mills can be of the overflow or of the grate discharge type. Overflow discharge mills are used when a product with high specific surface is ...
By combining these into a single stage SAG and adding contingency power, the overall risk to achieving throughput and grind size was reduced. The installed mill is an Ø8.50m x 6.10m EGL (28' x 20') Outotec grate discharge SAG mill, complete with an 8 MW variable speed drive (VSD).
Along with the new mill offering, Outotec also introduced a Polymer Hydrostatic Shoe Bearing (HSB) system, designed to maximize grinding mill availability and simplify maintenance. The MH grinding mill series includes a range of SAG, ball and rod mills in standardized sizes with a capacity of up to 3.1-megawatt (MW) installed power.
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.
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. Check price. CASE STUDY: PROMINENT HILL - outotec. and discharge grates on the Ø34' SAG mill. However, following inspection, the scope of works was extended to include replacement of all the shell plates ...
Semi-autogenous mills or SAG mills, as they are often called, can accomplish the same size reduction work as two or three stages of crushing and screening. Often used in grinding at modern mineral processing plants, SAG mills reduce the material directly to the . Get Details; Outotec HIGmill High Intensity Grinding Mill Outotec
Aug 09, 2010· SAG mill to Conquest Mining (ASX: CQT) for a cash price of $6.95 million. The purchase includes: • Outotec 3.6MW Grate Discharge SAG Mill with major spares: o main electric motor: o girth gear; o gearbox; o pinion and pinion bearings; and • Russell (RME) 7-Axis Mill Re-lining Machine. All equipment is new, complete and in original packing.
Outotec® MH Series Grinding Mills offer a cost effective, and easy to operate and maintain grinding solution across the mill lifecycle. The MH Series includes a range of SAG, ball, and rod mills in standardized sizes with a capacity of up to 3.1 MW installed power, and is based on over 100 years of experience with grinding technologies.
SAG and ball mills with grate discharge are not prone to locked charge events because of the high amount of rocks and balls compared to fine ore. The pulp dischargers of a SAG mill continually pump the finer material out of the mill, lowering the total amount of residual fine ore and thus improving the situation in respect to locked charge starts.
SAG Mill vs Ball Mill. Ball Motion inside a SAG Mill. ... A Morgardshammar overflow mill can be converted into a grate discharge mill only by changing some liner parts and without any change of the mill. Trunnion liners are rubber coated fabricated steel or cast steel. In grate discharge mills the center cone and the trunnion liner form one piece.
Metallurgical ContentBall Charge Motion inside a SAG MillSAG Mill OperationSemi Autogenous Design FactorsSAG Mill Operation ExampleProcess Plant DescriptionSAG Mill Design and Specification Operating Problems Since CommissioningDesign Changes and Future Operating Strategies AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the .
lifter for sag mill Slurry flow in mills with TCPL ? An efficient pulp lifter for ag/sag mills- lifter for sag mill,Extensive test work carried out on slurry removal mechanism in grate discharge mills (ag/sag) has shown that the conventional pulp lifters (radial and curved) have inherent drawbacks They allow short-circuiting of the slurry from pulp lift.Slurry flow in mills with TCPL - An ...
Outotec® Grinding Mills. Optimize grinding mill performance, efficiency, and availability to ensure you meet your plant's operational targets. Outotec high-performance grinding mills use advanced simulation tools for the best possible process efficiency, mechanical reliability, and maintainability.
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