Power-based modelling of single-stage AG and SAG mill …
considered, such as a primary SAG and secondary ball mill circuit where the individual stages would be ESAG and Eball, and the combined total circuit CEE would be Etotal. In all cases, the specific energy consumption is defined as the motor power consumed relative to the shell of the mill (a.k.a.
Advanced Controller for Grinding Mills: Results from a ...
Figure 2. Ball Mill Grinding Circuit The ball mill is in closed circuit with a sump and three cyclone classifiers. The ore and trim water are added to the ball mill and the outflow from the ball mill goes to a sump where additional water is added. The slurry from the ball mill is pumped out of a sump into two cyclone separators. The underflow ...
What's the Difference Between SAG Mill and Ball Mill ...
The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. …
Grinding Circuit Design for Adanac Moly - SGS
in a SAG and Ball mill circuit where there is no scope for storage capacity between milling stages and throughput is normally limited by a bottleneck at one stage or the other. In this case any ore with a high BWi value will have reduced . throughput due to the ball …
Optimization and Performance of Grinding Circuits: The ...
Semi-Autogenous Grinding (SAG) mill and a ball mill. The SAG mill circuit also includes a single-deck screen and a cone crusher while the ball mill circuit utilizes hydrocyclones. Currently, the grinding circuits are inefficient in achieving the aspired product fineness of x. P, 80 ...
Grinding Circuit - an overview | ScienceDirect Topics
The SAG mill trommel undersize is combined with the ball mills' discharge and pumped to two parallel packs (clusters) of twelve 660 mm diameter cyclones. The cyclone underflow from each line reports to a ball mill, while the cyclone overflow is directed to the flotation circuit. The designed ball milling circuit product is 80% passing 150 µm.
Shifting the comminution workload from the primary ball ...
Investing in new process improvement technology: reducing the risk of implementation – a way forward Watch. Nova copper-nickel project optimisation of the copper rougher-scavenger circuit through advanced measurement and control Watch. The development of optimised pulp lifter design for the Ahafo SAG mill using DEM modelling Watch.
AMIT 135: Lesson 6 Grinding Circuit – Mining Mill …
AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill. Because of the range of mill sizes available, AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill circuit. A diagram of types of AG/SAG ...
(PDF) A SUMMARY OF ENERGY EFFICIENCY …
Energy studies for the SAG-ball mill circuit and regrind/flotation circuits were carried out in 2018/2019 to identify opportunities for energy conserv ation and improving production performance. A ...
SAGMILLING .:. Articles
Blank spreadsheet that is pre-populated with the field names needed to import laboratory test results into the SAGMILLING circuit model testwork database (subscription required). Enter your test results, one per row, arranged into the columns indicated. To import into your testwork database, copy the block of cells starting with the top row ...
Optimizing Performance of SABC Comminution Circuit of …
This circuit shows a semi-autogenous grinding (SAG)/ball mill circuit where both grinding mills are in closed circuit, with the SAG mill closed with a crusher to control the …
Grinding Mills - an overview | ScienceDirect Topics
The circuit comprises a SAG mill, 12 m diameter by 6.1 m length (belly inside liners, the effective grinding volume), two pebble crushers, and two ball mills in parallel closed with cyclones. The SAG mill is fitted with a 20 MW gearless drive motor with bi-directional rotational capacity.
San Bartolomé Silver Mine, Potosi - Mining Technology ...
Whole ore will be fed directly to the jaw crusher then fed to the SAG/ball mill circuit. The oxide-dump ore will be handled in a similar manner. The grinding circuit discharge will be fed to an agitated-tank leach circuit with an average leach residence …
sag ball mill circuit - purpleacademy.in
sag ball mill circuit. ABC closed circuit AutogenousBallMillCrusher Another similar technique is the ABC open circuit where the crusher product feeds the ball mill rather than the autogenous mill Crusher product is typical feed to a ball mill using large diameter balls but not much grinding of 2025 mm ore can be accomplished in an autogenous mill
Examples of Transfer Size Distributions from AG/SAG Circuits
Actual comminution circuits consist in most of the cases in coarse crushing, SAG milling, pebble crushing and secondary ball milling. In these circuits the SAG mill is the largest energy consumer ...
sag ball mill circuit - Farmine Machinery
sag ball mill circuit. FOB Reference Price:Get Latest Price size, ball load, mill speed and solids will represent the total load. ball mill sag mill scw jb pc -6 1 nnc fresh feed water water pebble crusher screen cyclones sump pump fig. 1. sabc ab milling circuit. scw solid concentration by weight fraction in the sag mill feed jb balls charge bulk fraction of the sag mill volume nnc
Optimizing Performance of SABC Comminution Circuit of …
circuit is shown in Figure1. It is commonly referred to as a SABC circuit, for Semi-Autogenous Ball mill Crusher (SABC). This circuit shows a semi-autogenous grinding (SAG)/ball mill circuit where both grinding mills are in closed circuit, with the SAG mill closed with a crusher to control the amount of 'critical size' material in the circuit.
Application of Operating Work Indices in Autogenous ...
circuit or the overall performance of an autogenous-semiautogenous (AG-SAG)/ball mill circuit, but they are of limited value in evaluating AG-SAG and ball mill sections separately. This problem arises due to the difficulty of describing particle size distributions with different shapes by one number, the eighty percent passing size. This
Gold Fields Granny Smith Grinding Circuit: A Metallurgist ...
Utilising existing steady-state, JKSimMet models of the Kidston SAG mill and Granny Smith ball mill, a range of different circuit options were evaluated. The high-aspect, variablespeed SAG mill allowed - GSM to consider a number of different circuits due …
What is the difference between a SAG mill and ball mill?
SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill with a 44 ...
Grinding - Mineral Processing
Grinding circuit. The grinding circuit usually consists of a SAG or AG mill and one or two ball mills. Grinding is continuous and fully integrated with subsequent flotation operations. SAG or AG mills. The crushed products are ground in SAG or AG mills. The self-grinding machine can grind ore without grinding media such as iron ball, or steel ...
SAG mills - Outotec
SAG milling extends itself to many applications due to the range of mill sizes available. They can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill and some or all of the work done by a ball mill. SAG mills are also an optimum solution for wet grinding since crushing and screening in these ...
SAG & BALL Mill Maintenance – KIE SARL
SAG Mill make use of steels balls included with some large hard rocks for grinding. These mill utilize the balls in making the large fragments of materials broken into pieces and ball mills are used primary for single stage fine grinding, regrinding, and as the second state in two stage grinding circuits.
Freeing up milling capacity in a SAG mill & ball mill ...
Where the SAG mill/ball mill circuit is the bottleneck in the processing plant the pebble circuit can be a significant factor in limiting overall plant capacity. The pebble circuit recirculating load can be very significant (depending on the ore characteristics and …
Improving Energy Efficiency in Barrick Grinding Circuits
Following the upgrades in the SAG mill circuit, sampling and modeling of the ball mill circuit identified a bi-modal hardness characteristic of the ore. valuation with both MetCom and JK SimMet®E lead to changes in the ball make up size from 75 mm to a 50:50 mix of 75 mm and 38 mm.
Mill Circuit Pump Manual
crushed ore is fed into a SAG/Ball mill circuit with a median size of approximately 12,000 microns. Most SAG Mills are operated in closed circuit with a screen. The screen fi lters undersized ore, normally minus ½ inch, to a ball mill discharge sump. The combined mill discharg-es are pumped to undergo classifi cation, normally via hydrocyclones.
Model:Amelunxen SGI - SAGMILLING
Amelunxen SGI Model. This is a model that estimates the specific energy consumption of a SAG or AG mill plus ball mill circuit using the equation by Amelunxen (2014) for E SAG and the classical Bond work index equation for E ball substituting CF ball in the place of the Rowland efficiency factors.. The model requires manual calibration factors for both equations (CF SAG and CF ball ...
(PDF) SAG mill circuit optimisation at Ernest Henry Mining
At 8 – 12 % v/v ball charge volume, and 25 – 35% v/v total charge volume the SAG mill typically draws 10 –. 11 MW. The operating work index for the mill is extremely ore. …
Energy and Cost Comparisons of HPGR-based Circuits | E …
The results showed that the HPGR-ball mill circuit achieved a 21% reduction in energy consumption over the existing SAG-ball mill circuit at the same P80 grind size of 160 mircons (μm). At a grind of 80% passing 75 μm, the HPGR-stirred mill circuit …
MMPB-748C Trunnion Magnet System - Eriez
circuit can be varied to retrofit an existing SAG/ball mill and available space at the discharge. • The magnetic circuit is designed to provide maximum strength for high slurry throughputs and up to 4 inch diameter grinding balls. • The trunnion magnet can …
SAG Mill Grinding Circuit Design - 911metallurgist
These mills typically grind ROM ore in a single stage. A large example of such a mill was converted from a single-stage milling application to a semi autogenous ball …
USING THE SMC TEST® TO PREDICT COMMINUTION …
ball mill cyclone overflow. The closed circuit crusher distribution can be seen to be relatively steep compared with the open circuit crusher distribution and ball mill cyclone overflow. Also the open circuit distribution more closely follows the gradient of the cyclone overflow. If a ball mill circuit were to be fed 2 distributions, each with ...
Bond Grinding Circuit Efficiency - ceecthefuture
Mill Ball Mill Closed circuit crushing to 16 mm Open circuit 8' dia. rod mill to 1 mm Closed circuit 8' dia. ball mill to P80 um The ore Test Work Index = Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK ...
Orway Mineral Consultants Canada Ltd. Mississauga, ON ...
2006). The laboratory bench-scale SAG mill reproduces operating conditions of a commercial SAG mill, in a closed circuit dry grinding environment. The ground product for the laboratory SAG mill is then submitted to the Bond ball mill work index test. The number of SAG mill revolutions required to grind the material to a P