sag mill grate slot size

SAG Mill Grinding Circuit Design. View Larger Image; Metallurgical Content. Ball Charge Motion inside a SAG Mill ... the designed SAG mill size and operating conditions typically control circuit throughput, while the ball-mill circuit installed power controls the final grind size. ... lifter spacing and angle, grate open area and aperture size ......

Optimizing your SAG mill operation. Posted by Matrix on 21st March 2007 Sanjeev Latchireddi, Chief Process Engineer – Grinding Americas, Outokumpu Technology, looks at the shift from ball mills to SAG mills. ... Similar to slurry flow-back, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the ......

sag mill grate slot size noaddictionpowdercoin, grate open area and aperture size,, In an AG/SAG mill there, is a grate discharge trunnion supported mill or a grate discharge, 216Effect of SAG Mill . Live Chat. Minerals Free FullText Optimizing Performance of SABC ....

Aug 6 2013 A SAG Mill trommel screen lets you control the true discharge size of your strangely enough zenith is the mill shell liner and discharge grate This trommel should have screen opening slots of 1/2″ x 1/2″ as a maximum....

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...

Mar 02, 2010· 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. ... All AG/SAG mills using radial or curved pulp lifters suffer from inherent material transport problems such as ......

Jan 08, 2016· PAI SAG Mill Training Performance Associates International ... Ore that's crushed in a primary crusher is usually fed into a SAG mill, where it is reduced in size so that it can be fed into a ......

ratio of South African style SAG mills, Powell et.al, (2001). ... discharge grate (18mm round holes extending to near the centre of the grate), and pebble ports (75mm round holes). ... The estimated size distribution in the mill at the time of test 7 is based...

Grate design should incorporate an integral radial lifter. This lift on a grate can increase the grate life by up to 50 percent. The slot opening size is determined by the lump size to be retained in the mill. Grate plugging is minimized by proper slot taper and alloy selection. See Figure 5....

According to , for years, El Teniente has encountered problems with grate piece breakage in its SAG mill, resulting in low mill availability and operational instability. Starting in 2010, El Teniente began to collaborate with to solve the problem. ... An increase in slot size and operational stability increased throughput by 7% ......

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....

has recognized Codelco El Teniente as the first mining company in the world to use 's innovative grinding technology: the next level of Poly-Met discharge grates for SAG mills....

Improving Autogenous/Semi-Autogenous Grinding Performance and Energy Efficiency with Optimised Pulp Lifter Design S Latchireddi1 ... predominantly in single stage AG/SAG mills, as they handle ... grate slots, they get an equal chance to go back into the mill as...

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)....

THE INFLUENCE OF MILL SPEED AND PULP DENSITY ON THE GRINDING EFFICIENCY 89 ... past with 2 repeat test runs with the ∅0.82 x 1 m grate discharge mill in open circuit with a charge in equilibrium ... and the particle size tendencies are correct (the finest feed gives the finest discharge)....

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. This scale of DEM model is now within the possible range of standard workstations running an efficient DEM code....

for AG/SAG milling to be determined. AG/SAG inef ciency varies according to the transfer size fi (T80), whereby the ner sizes have less ineffi ciency than the fi coarser sizes. This means a closed circuit single stage AG/ SAG mill can operate at a reasonable ef ciency if the fi nal fi product is in the 75 μm range. Burgess (1991) stated ......

sag mill grate open area. Contact us at: +86 13953560679. Connect with us: ... /2011. with double grates and a total open area of 8.Circulating Load The circulating load is greatly influenced by the grate discharge slot opening. ... In general terms, lifter spacing and angle, grate open area and aperture size, and pulp lifter design and ......

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 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....

COPPER MOUNTAIN: OVERVIEW ON THE GRINDING MILLS AND THEIR DUAL PINION MILL DRIVES ... general SAG mill data Specification Data Mill size 10.363 M [34 feet] diameter by 6.096 M [20 feet] ... Mill type Wet grinding, grate discharge Mill drive motor size 17,000 HP Mill drive motor type Synchronous 200 RPM Inside diameter 10,363 mm Length 6,096 mm ......

Overflow Versus Grate Discharge Ball Mills: An Experimental Investigation. ... Recent developments in understanding the importance of material transport in performance improvement of AG/SAG mills and the limited research work on comparing discharge mechanisms in balls mills has led to the present investigation. A set of experimental test work ......

Different combinations of SAG mill ball charge and grate open area were tested until 2006. A ... the use of a blend of ball mill balls to increase finer size particles and smaller cyclone apex. These recommendations did not result in improvement in mill throughput after implementation....

TECHNICAL NOTES 8 GRINDING R. P. King. 8-2 &ROOLVLRQ 5ROOLQJ ZLWK QLSSLQJ ... LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power ... For overflow mills K = 7.98 and for grate mills K = 9.10. This difference is ascribed to the presence of a pool of sl urry that is present on the bottom...

Yanacocha Gold Single Stage SAG Mill Design, Operation and Optimisation. ... four diff erent shap e grate slot s were in stalled, ... SAG mill media size distrib ution....

Slurry flow in mills: grate-only discharge mechanism (Part-1) Author links open overlay panel S. Latchireddi S. Morrell. Show more. ... (SAG) mills use steel or rubber grates to hold back the grinding media, whilst allowing the product slurry to flow through and out of the mill. The total open area, size, ......

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...

balls and blocking the grate discharge. Optimization of mill performance by using online ball and pulp measurements by B. Clermont* and B. de Haas* Synopsis Ball mills are usually the largest consumers of energy within a ... Figure 6—Cross-section of the mill with angular references % Passing Size ......

SAG Mill Liner, Semi-autogenous Mill Liner Supplier. Home > Why Us > SAG Mill Liner SAG Mill Liner On Oct. 26, 2016, "China National Gold Group Corporation" held a centralized procurement tender of mill liners in Beijing, which to purchase mill liners for "China Gold Inner Mongolia Mining Co.,Ltd."....

the feed percentage of intermediate size particles ... been demonstrated the influence of the feed size distribution in the SAG mills throughput, power consumption and accordingly, specific energy. The feed size distribution together with the ore ... mill diameter, mill length, grates openings, and pebble ports size;...

Our grates are made of our special H79 high-strength steel which is tougher and harder than commonly used chrome-moly steels. Our grates made of H79 experience very little slot peening so mill throughput is not compromised. Proven high volume vendor Columbia Steel can provide all the castings required for a complete grinding mill reline....

Autogenous Grinding (SAG) mill in closed circuit with a hydrocyclone package. The gold ... Mill fresh feed particle size distribution was also determined using rod screens and laboratory screens. Weight of these samples after drying was 75 and 105 ... grate. The load in the mill is calculated from...

The rubber grates have tapered slots to minimize the plugging with near size particles. Rubber grates are extensively used in AG / SAG & Primary ball mills. Polycorp regularly supplies rubber grates for mills up to 28 ft in diameter....

The transfer size, T 80, is the characteristic size of the stream between the primary (SAG) and second (ball mill) stages of grinding.It is an important tuning factor for making the circuit work effectively....

Pebble Mill Grinding - 911 Metallurgist . Oct 22, 2016 ... In wet grinding the tube mill operates in closed circuit with a mechanical ... On the basis of mill volume the grate mill shows 10% to 29% more......

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. This scale of DEM model is now within the possible range of standard workstations running an efficient DEM code....