### PT Freeport Indonesia

Mill capacity may vary according to ore feed hardness and size in addition to other economic considerations that may require a lower operating level in order to maximize overall resources value North Concentrator commenced functioning in 1972 and subsequently underwent expansion through continual minor projects Get price

### Autogenous and Semi

The feed size for these mills is limited to the maximum size that can be practically conveyed and introduced into the large mill feed chutes And the product of the large AG/SAG grinding is either a finished size ready of processing or an immediate size for further grinding in a ball mill pebble mill VERTIMILL or a stirred media detritor Get price

### Understanding Size Effects of Semi

Description Although it is well known and easily experienced that the feed size distribution influences the throughput and stability of operation of a semi-autogenous grinding (SAG) mill the details are poorly understood since it is often only the input and output measurements that are used to identify unfavourable in-mill conditions Get price

### Economics of Grinding for Pelleted Feeds

Economics of Grinding for Pelleted Feeds In the feed manufacturing industry particle size reduction (grinding) is second only to extrusion processes (pelleting expanders extruders) in terms of total energy consumption To achieve a finer grind (smaller finished particle size Get price

### Optimum choice of the make

As the feed size is reduced to 13 4 mm a 62 38 mix of 50 8 mm and 25 4 mm balls was found to be the optimum mix As the feed size is reduced further less of the 50 8 mm balls and more of the 25 4 mm balls are required for the maximum capacity attaining of 25 4 mm balls for a feed size of 4 7 mm (Fig 6d) The capacity difference between Get price

### Cyclone Mill Twister

In the cyclone mill TWISTER size reduction is effected by impact and friction between the rotor and the friction surface of the fixed grinding ring The feed material passes through the hopper (with splash-back protection) onto the rotor which is rotating with high speed and is thus submitted to preliminary size Get price

### A Neural Network Model for SAG Mill Control

SAG specific power range of about 3 to 9 kWh/t for this site The design of the ore stockpiling and conveying system contributes to fluctuating size distribution with significant short-term segregation occurring under certain operating situations Depending on ore type and feed size distribution each SAG mill will process between 700 and 3000 tph Get price

### SAG MILLS CHOOSING METHODS II The working index of F

General view of the Bond theory equation has the following form Where E is the specific energy of particle size reduction for 1 ton of material kW * h / t Wi – Bond's working index P_80 – the mill feed size 80% passes the control sieve F_80 – the product size at the output 80% passes the control sieve Get price

### sag mill operation

IMPROVEMENTS IN SAG MILL THROUGHPUT FROM 1 IMPROVEMENTS IN SAG MILL THROUGHPUT FROM FINER FEED SIZE AT THE NEWMONT AHAFO OPERATION *Adrian Dance1 Sonny Mwansa2 Walter Valery 2 George Amonoo3 and Bryon Bisiaux3 1SRK Consulting (Canada) Inc 22nd Floor 1066 West [Chat Online] Turbo Pulp Lifter (TPLTM) An Efficient Discharger to Get price

### SAG Mill

SAG mill feed is conveyed from the coarse ore stockpile The ore passes through a gyratory crusher where it is reduced to 8 inch diameter before being dumped on the pile A line drawing of the Fort Knox SAG mill liner configuration and spare liners awaiting installation Five and one quarter inch steel grinding balls - cannon balls - occupy 8% Get price

### Autogenous and Semiautogenous Mills Datasheet

AG/SAG mills accomplish the same size reduction work as 2 or 3 stages of crushing and screening Features The feed size for these mills is limited to the maximum size that can be practically conveyed and introduced into the large mill feed chutes Get price

### FREDA REBECCA SAGMILLING CIRCUIT OPTIMIZATION

respect with SAG mills being increasingly less sensitive as the ball charge is increased (Morrel S and Valery W 2001) 2 2 EFFECT OF FEED SIZE DISTRIBUTION ON SAG MILLING The qualitative eﬀect of changes in particle size distributions (PSD) on the SAG mill performance can be addressed by using the grind curves Get price

### Used Mills For Sale Grinding Mill

Industrial mills are used to change the size of a product whether by breaking or grinding a material into smaller granules or powder or by agglomerating a product into larger granules or pellets Roller mills use rollers to crush the product into a smaller granule or powder Get price

### FREDA REBECCA SAGMILLING CIRCUIT OPTIMIZATION

respect with SAG mills being increasingly less sensitive as the ball charge is increased (Morrel S and Valery W 2001) 2 2 EFFECT OF FEED SIZE DISTRIBUTION ON SAG MILLING The qualitative eﬀect of changes in particle size distributions (PSD) on the SAG mill performance can be addressed by using the grind curves Get price

### Dynamic modeling and simulation of a SAG mill for mill

The modeling and simulation of semiautogenous (SAG) mills have been widely used in the design and optimization of mill performance in terms of its power draw processing capacity and product size distribution However these models are solved under steady approximation and do not provide any information on mill charge distribution in real time Get price

### Application of Operating Work Indices in Autogenous

terms such as "SAG mill inefficiency factor " As ore breakage characteristics can be a major factor in AG/SAG mill product size distribution Figure 2 compares only data for porphyry ores Before the true power efficiency of an AG/SAG grinding mill can be properly assessed by using the Wio concept the T 80 used for calculations must be Get price

### Grindin' at the Mill

The SAG mill feed is controlled by the mill weight measured by 4 load cells on the mill bearing system Therefore if the ore does not grind quickly enough in the SAG mills the mill weight increases and the control system reduces feed to the mill to maintain the desired mill weight Get price

### Optimum choice of the make

As the feed size is reduced to 13 4 mm a 62 38 mix of 50 8 mm and 25 4 mm balls was found to be the optimum mix As the feed size is reduced further less of the 50 8 mm balls and more of the 25 4 mm balls are required for the maximum capacity attaining of 25 4 mm balls for a feed size of 4 7 mm (Fig 6d) The capacity difference between Get price

### Limestone wet ball mill limestone feed size

Ball mill for limestone rossjohnsoncoza Ball Mill Limestone Wholesale Limestone Suppliers - Alibaba Alibabacom offers 2 558 ball mill limestone products About 1% of these are lime A wide variety of ball mill limestone options are available to you such as free samples Ver Precio limestone wet ball mill limestone feed size 200T H-1000T Get price

### Selection of Comminution Circuits for Improved Efficiency

from a certain feed size to a product size as measured against a benchmark such mill product size 1 Plant relocated to Black Swan Table 2 SUMMARY OF COMMINUTION CIRCUITS a SAG mill based circuit (P80 of 106 to 150 um) has media costs of around A$1/t Providing the ore is amenable the use of primary autogenous milling can Get price

### Feed particle size Implications on the digestion and

ground seeds with protein meals The feed industry has little control over the particle size of protein meals such as soybean meal and meat meal as they are supplied pre-ground by the processor However the particle size of seeds including cereals and legumes may vary at the feed mill 010977_Journal_3 10-07-2007 09 38 Pagina 439 Get price

### Freda Rebecca sagmilling circuit optimization

Abstract Simulation work was carried out to analyze how feeding a finer size distribution to a single stage SAG mill in closed circuit with hydro cyclones at Freda Rebecca Gold Mine would affect through put and specific energy consumption using an Excel based milling process simulator developed by Hinde a comminution specialist who has worked for Mintek for many years Get price

### SAG Mill Control at Northparkes Final

the size distribution of the SAG mill feed can be regulated (to some extent) The feedrate isusually automatically controlled by adjusting the speed of one or more of the feeders It is quite common to have one feeder being adjusted automatically to control feedrate to the mill Get price

### Solved 2 A SAG Mill Operates With A 10 000 Hp Motor Typ

2 A SAG mill operates with a 10 000 hp motor Typical power draw is 80% of maximum The 80 percent passing feed size to the mill is 6 inches and the mill discharge has an 80 percent passing size of 2 3 mm Calculate the Operating Work Index for this mill if the feed tonnage rate is 1175 tonnes per hour Get price

### Optimization of mill performance by using

Optimization of mill performance by using online ball and pulp measurements Soon after a stop a mill is a dangerous place to enter for the personnel tasked with taking measurements or samples Crash stops are difficult to handle The mill and all feed streams should be stopped simultaneously but often they are stopped around about the same time Get price

### Optimizing your SAG mill operation

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 in terms of power draw for changes in mill load which depends on feed ore characteristics Get price

### Understanding Size Effects of Semi

Pax R and Cornish B 2016 Understanding Size Effects of Semi-autogenous Grinding (SAG) Mill Operation as a Pathway to Solving Feed Disturbances – Case Study using the MMG Century SAG Mill in Proceedings 13th AusIMM Mill Operators' Conference 2016 pp 321–330 (The Australasian Institute of Mining and Metallurgy Melbourne) Get price

### Improvement in SAG Mill throughput from finer feed size at

The PTI study focussed on ball mill limited material from the Apensu open pit Following a benchmarking study of all blasting crushing and grinding practices in January 2009 PTI recommended changes in both blasting and crushing conditions in order to generate a finer feed size to the SAG mill Get price

### A Neural Network Model for SAG Mill Control

SAG specific power range of about 3 to 9 kWh/t for this site The design of the ore stockpiling and conveying system contributes to fluctuating size distribution with significant short-term segregation occurring under certain operating situations Depending on ore type and feed size distribution each SAG mill will process between 700 and 3000 tph Get price

### Milling Speed and Feed Calculator

Determine the spindle speed (RPM) and feed rate (IPM) for a milling operation as well as the cut time for a given cut length Milling operations remove material by feeding a workpiece into a rotating cutting tool with sharp teeth such as an end mill or face mill Get price

### Ball Mill Feed Size

what is the feed rate for ball mill and the size is NEUROCONTROL OF A BALL MILL GRINDING CIRCUIT ore feed rate changes and feed particle size variations Variations in ore hardness and feed size variations may reduce the mill throughput drastically by causing the mass flow rate of the hydrocyclone overflow and particle size distribution to Get price

### Major Mines Projects

The cone crusher product discharges directly on to the mill feed conveyor to be carried back into the SAG mill The secondary grinding circuit consists of a 5 5 m diameter x 9 8 m grinding length 5 222 kW ball mill in a closed circuit with the grinding cyclopac Get price

### Sag Mill Feed Size ? Grinding Mill China

sag mill feed size – Grinding Mill China Modifying the sag mill feed size Modifying the mill feed size distribution The SAG milling of ores with high levels of competency leads to high SAG mill specific Type of Grinding mill in China for stone mineral grinding Get price

### Optimizing your SAG mill operation

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 in terms of power draw for changes in mill load which depends on feed ore characteristics Get price