# calculation of recirculation load on a single stage sag mill

### Modelling SAG milling power and specific energy

Modelling SAG milling power and speciﬁc energy consumption including the feed percentage of intermediate size particles the most widely used and energy consumer stage in the grinding circuit, acquires a very important role. distribution affects the SAG mill load and the load affects directly

Get price### 5. FANS AND BLOWERS

In singlestage blower, air does not take many turns, and hence it is more efficient. Centrifugal blowers typically operate against pressures of 0.35 to 0.70 kg/cm2, but can achieve higher pressures. One characteristic is that airflow tends to drop drastically as system pressure 95. 5. Fans and Blowers

Get price### Orway Mineral Consultants Canada Ltd. Mississauga, ON

the final product size. The prediction of the SAG mill transfer size used in the formula is made by comparison with pilotplant data and operating plant data for similar ore types (Barratt, 1989). The approach acknowledges grinding efficiency as the ratio of operating work index to that for a singlestage ball mill.

Get price### Improving Energy Efficiency Via Optimized Charge Motion

The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size. Considering a typical mining operation processes 10,000 to 100,000 tons per day the energy expenditure in grinding is 50 percent of the

Get price### EXPERT SYSTEMS IMPLEMENTATION AT PEÑOLES GROUP

Each ball mill has a single cyclone classifiion stage with the overflow secondary and tertiary grinding stage utilizing two ball mills. The SAG/Ball Mill Circuit has an overall processing capacity of 2300 TPD. A 20.0 ft x 7.5 ft, 1500 HP the recirculation load is not increasing.

Get price### mill circulating load

Mainly in USA,the term circulating load is more often used than the circulation factor.Circulating load is percentage of coarse return in relation to fines & it can be calculated by : Coarse return TPH X 100 / Mill output TPH.Normal range of cirulating load in a conventional close circuit ball mill is

Get price### Autogenous and SemiAutogenous Mills ScienceDirect

The largest volume mill in the world was constructed for Tarkwa, Ghana, in 2004. The mill is 8.23 m diameter by 12.19 m effective grinding length (EGL) or inside liner length. The mill is operated in a singlestage grinding circuit. Most AG and SAG mills have

Get price### TECHNICAL NOTES 8 GRINDING R. P. King

LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp5762. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the

Get price### A Method of C alculating Autogenous/ SemiAutogenous

SAG mills mimic the same shortcoming. It follows that in order to obtain the speciﬁ c energy (SE) to achieve a certain transfer size, based on the 80 per cent passing value, an inefﬁ ciency factor must be applied to the SE of single stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method.

Get price### SCREEN CAPACITY CALCULATION

Current screen capacity calculations do not take into consideration enough of the factors affecting screen efficiency. The old formulas were designed to keep calculations short and manageable for manual calculation. The common use of computers in today''s world makes it possible to do more complex screen capacity calculations in much shorter time.

Get price### calculation of critical velocity in ball mill

Ball mills are used primary for single stage fine grinding, regrinding, and as the second stage in two stage grinding circuits. According to the need of customers » More formula for calculate the ball mill velocity BINQ ball mill critical speed calculation – beltconveyers . formula for critical speed of ball mill Manganese

Get price### ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION

@article{osti_895022, title = {ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION}, author = {Raj Rajamani and Jose Delgadillo and Vishal Duriseti}, abstractNote = {The grinding efficiency of semi autogenous milling or ball milling depends on the tumbling motion of the total charge within the mill. Utilization of this tumbling motion for

Get price### Comminution Services SGS

mill primary grinding. In the SAG mill testwork when the steel is added the SAG product classifiion size and ore feed size distribution is varied. If necessary, pebble crushing or mill speed can also be investigated. All tests are evaluated on the basis of feed rate, power consumption and product size analysis. Unless singlestage autogenous

Get price### SkimAir flash flotation improves gold recovery for Polyus

This SAG mill discharge is screened with a 12mm screen. The screen overflow is crushed and recirculated back to the SAG mill. The screen underflow is fed to a gravity separation stage which is designed to recover the gravity recoverable gold. The tails of the gravity separation are pumped to a secondary hydrocyclone, and these tails are then

Get price### mill circulating load ferienzimmerwarnke

Mainly in USA,the term circulating load is more often used than the circulation factor.Circulating load is percentage of coarse return in relation to fines & it can be calculated by : Coarse return TPH X 100 / Mill output TPH.Normal range of cirulating load in a conventional close circuit ball mill is

Get price### SINGLE STAGE SAG/AG MILLING DESIGN Metallurgy

The single stage SAG/AG milling option is ideal for starter projects with significant exploration and expansion potential. Currently a number of the largest SAG mills designed are installed in single stage configuration. This paper discusses the challenges associated with the process design of single stage SAG/AG milling circuits, the design

Get price### Benchmarking: SAG Mill Power Draw Models SAGMILLING

Benchmarking: SAG Mill Power Draw Meadowbank Muteb, P. & Allaire, J., Meadowbank Mine Process Plant Throughput Increase, Proceedings of the Canadian Mineral Processors Annual General Meeting, Ottawa, Canada, January 2013.

Get price### A Method to Determine the Ball Filling, in Miduk Copper

After SAG mill, a trommel screen produces two over and under size materials which the oversize part is circulated into SAG mill and undersize reports to hydrocyclone for further process. Ball filling identify was implemented in this work using mill`s load sampling and ball abrasion test.

Get price### How to Calculate Total Mass or Load of Conveyor for Load

May 13, 2015 · I want to select a motor for a conveyor or machine, for Load torque calculation, i need the weight of the parts which has to move by motor. Now the problem is that,can i simply take full weight of all parts which has to move or carry? or is there is any specific method to take weight of all parts like chain, shaft, belts ? for example like: if there is shaft with pulleys on two pillow blocks

Get price### AMIT 135: Lesson 5 Crushing – Mining Mill Operator Training

This means that the number of crushing stages can be reduced depending on the feed size accepted by primary grinding stage. Image of a "Classical" 3stage ore crushing prior to rod mill [image: (13551)] Diagram of Typical 12 stage ore crushing prior to AGSAG mill [image: (13552)] Calculation of Reduction Ratio in Crushing

Get price### calculation of critical velocity in ball mill

Ball mills are used primary for single stage fine grinding, regrinding, and as the second stage in two stage grinding circuits. According to the need of customers » More formula for calculate the ball mill velocity BINQ ball mill critical speed calculation – beltconveyers . formula for critical speed of ball mill Manganese

Get price### Benchmarking: Yanacocha Singlestage SAG Mill

The Bond/Barratt singlestage SAG model results in the following: Survey 1: F 80 =79.1 mm P 80 =152 µm E asag = 16.4 kWh/t (20% low) Survey 2: F 80 =72.4 mm P 80 =154 µm E asag = 16.3 kWh/t (10% low) The Morrell Mi singlestage SAG model using the assumed ball mill work index F 80 and grams per revolution from the 212 µm closed test

Get price### Sag and Tension Calculations trimble

SagTension Calculations: Refinements and Enhancements Made by Trimble Energy Solutions by: Jacques Hamian and Yair Berenstein Abstract Sagtension programs have traditionally calculated the conductor''s sagtension characteristics using the ALCOA graphic method. By refining the input used in this equation, and augmenting

Get price### Freda Rebecca SAG milling circuit optimisation CEEC

ABSTRACT Simulation work was carried out to analyse 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 throughput 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### Solved: Calculate The BOD Loading, Hydraulic Loading, BOD

Calculate the BOD loading, hydraulic loading, BOD removal efficiency, and effluent BOD concentration of a singlestage trickling filter based on the following data: Influent flow =1530 m3/d Recirculation ratio = 0.5 Primary effluent BOD = 130 mg/L Diameter of filter =

Get price### Modelling SAG milling power and specific energy

Modelling SAG milling power and speciﬁc energy consumption including the feed percentage of intermediate size particles the most widely used and energy consumer stage in the grinding circuit, acquires a very important role. distribution affects the SAG mill load and the load affects directly

Get price### A Mechatronic Solution Design and Experience with Large

loads and faulty conditions, mechanical and magnetic spring constants, mostly only as one way information. At that time, only small mill tubes were manufactured and also the magnetic forces were less compared to today''s large high power mills. Mechanical design calculations were based on static load cases in terms of forces and acceleration

Get price### White paper, September 2015 SmartMill™: Exceed your

recirculating load – and at the same time preventing excessive equipment wear. The specific variables to be accommodated and the best strategy to control the grinding process will depend on the actual process circumstances, and the type of mill and drive involved. In modern grinding, ball mills and SAG mills are two types of mill commonly found.

Get price### effect of balls charge on sag mill performance

effect of balls charge on sag mill performance. the grain comminution by ball impact, as well as on the basis of the The ball size in a mill has a significant influence on the mill throughput, power where: db max is the maximum ball diameter in a charge, d is the characteristic top limit. >> Get Price startling effect of ball ss removal on sag mill performance.

Get price### SAGMILLING .:. Home

Sagmilling is home to a collection of both free and subscriptionbased calculation tools to aid metallurgical process engineers perform comminution calculations. Grinding circuit design tools, including for SAG millball mill circuits, and geometallurgy energy models are available to subscribers.

Get price### SCREEN CAPACITY CALCULATION

Current screen capacity calculations do not take into consideration enough of the factors affecting screen efficiency. The old formulas were designed to keep calculations short and manageable for manual calculation. The common use of computers in today''s world makes it possible to do more complex screen capacity calculations in much shorter time.

Get price### Optimizing Performance of SABC Comminution Circuit of

of the SAG mill and ball mill (both rated at 6000 kW with a single pinion drive). The capacity of the SAG mill was not fully utilized, as the actual operating power draw was only 3358 kW. This meant it was only operating at 56% of its maximum power, providing large room for improvement. The load

Get price### Centrifugal Air Compressor Controls and Sizing Basics

Select an air compressor with sufficient turndown, without blowoff, to match to your load variance. If the load drops to 50% of peak often, you will have no choice but to allow some blowoff, if you are sizing a single centrifugal air compressor to your system. Consider a multiple air compressor system if load

Get price### Design SAG mill production when you need it most: In day 1

in a single stage SAG mill. Cyclones work best when the cyclone feed size is limited to 5 mm top size, as noted above when referring to screen selection. The product size is also a function of liberation and downstream requirements. SAG Mill ore hardness kWh/t: Energy required to grind an ore from F80 of 152 mm to T80 of 1.7 mm.

Get price### DeGrussa Processing Plant overview AusImm Bulletin

The primary crusher is a single stage C140 jaw crusher, fed from the ROM pad with a front end loader. The crusher product feeds into a Crushed Ore Bin with a live capacity of approximately 12 hrs. The ore is reclaimed from the bin using three vibrating feeders. The primary SAG mill is 7.3 m x 3.35 m with a 3.4 MW variable speed motor.

Get price### Selecting Inching Drives for Mill and Kiln Appliions

• Full load running torque required at the kiln or mill shell at inching operating speed. Typically this is set at 120% of main drive operating torque. • The desired output speed at the shell. Usually this is targeted at 0.1 RPM with a range of +50% / 10% • Single or dual pinions driving the ring gear. • Mill

Get price### Freda Rebecca SAG milling circuit optimisation CEEC

ABSTRACT Simulation work was carried out to analyse 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 throughput 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### Estimated Water Requirements for the Conventional

Estimated Water Requirements for the Conventional Flotation of Copper Ores . By Donald I. Bleiwas . Introduction . This report provides a perspective on the amount of water used by a conventional copper flotation plant, including the makeup water required to compensate for water losses. Much of the global

Get price### ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION

@article{osti_895022, title = {ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION}, author = {Raj Rajamani and Jose Delgadillo and Vishal Duriseti}, abstractNote = {The grinding efficiency of semi autogenous milling or ball milling depends on the tumbling motion of the total charge within the mill. Utilization of this tumbling motion for

Get price### Improving Energy Efficiency Via Optimized Charge Motion

The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size. Considering a typical mining operation processes 10,000 to 100,000 tons per day the energy expenditure in grinding is 50 percent of the

Get price### calculate circulating load primary crusher annasweethome

percentage of reciculation load of primary crusher. Lculating Circulating Load Ball Mill Mining calculate circulating load primary crusher 8211 sag mill recirculating load rate sarvamanglaashram calculate circulating load primary crusher 8211 Here is a formula that allows you to calculate the circulating load ratio around a ball mill and hydrocylone

Get price### 1waycoupled pilot SAG mill draft1

Inadequate discharge of slurry by the pulp lifters is often a problem for single stage AG or SAG mills because of high circulating loads when operated in closed circuit with a fine classifier. Carryover of coarser particles (past the discharge point onto the discharge cone)

Get price### Dynamic Load Of Ball Mill stpauluskita

ball mill dynamic load calculation . Dynamic Stiffness Calculation Of Ball Mill sinaforchi . calculate horizontal rotary ball mill torque. 2018626 rotary ball mill power dynamic calculation pochiraju. and mill power in a dry ball mill with balls and powder, mill diameter, mill speed and other variables affecting were used to estimate the dynamic angle of repose of the charge for . behaviour

Get price### Sag andtension claculation SlideShare

Feb 06, 2013 · Figure 14.5 shows the tension versus slack curves intersecting at a tensionof 3700 lb, which agrees with the preceding calculations.14.2.3 Sag Change Due to Ice LoadingAs a ﬁnal example of sagtension calculation, calculate the sag and tension for the 600ft Drake spanwith the addition of 0.5 inches of radial ice and a drop in conductor

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High quality ball screws by Thomson Antifriction design with precision ground or rolled helical groove The ball screws drive is an assembly that converts radial torque to linear thrust.

Get price### circulating load calculation bangladesh

Circulating Load Calculation In Closed Circuit Ball Mill. calculate sagball mill circulating load sxctezpur. done in a SAG/ball mill circuit with no coarse recycle classifiion of the SAG mill . in closed circuit with a spiral classifier and carried a large circulating load the power drawn by the three foot diameter mill was calculated from basic.

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