Jan 15, 2018· The HPGR-ball mill circuit was estimated to require 75% of the energy of a standard Semi-Autogenous Grinding (SAG) mill circuit. Even with an anticipated greater capital cost, the HPGR-ball mill circuit was found to give significantly better financial returns in all cases investigated in the feasibility study ( Ballantyne et al., 2016 ).
can result in damaged drive trains and enclosed gear drives Solution: Falk V-Class Enclosed Gear Drive and Autogard 820 Series Torque Limiter Result: Efficient and durable mill drive with minimal running costs and downtime in the event of a jam or sudden stoppages Ball and SAG mills Ball and Semi-Autogenous Grinding (SAG)
Modelling SAG milling power and speciﬁc energy consumption including the feed percentage of intermediate size particles ... Ball Mill SAG Mill Scw Jb Pc % -6" +1" N/Nc Fresh Feed Water Water Pebble Crusher Screen Cyclones Sump Pump ... The case study mills have all the same discharge system, resulting in a lower variation in the
GE Mill Drive Increase s Grupo Mexico Capacity ... exports from Mexico. To help meet this demand, Grupo Mexico, in conjunction with Corporation, added 6 huge 14 MW ball mills to their facility located in the Sonora state of Mexico. For these new mills, the engineering team ... case study g Parts: 1-800-458-0451 Motors: 1-800-541-7191
Case study 1: Model and optimize SAG-only circuit An existing large tonnage copper operation was operating with a single 38 ft, 19.4 MW SAG mill followed by two 25 ft 11.1 MW ball mills. The SAG mill was operating in a SAG-only configuration, closed by a vibrating screen. A base-case model of the existing circuit was
Ball and SAG mills Ball and Semi-Autogenous Grinding (SAG) mills are used in mining to crush materials into smaller, more manageable sizes, and to separate certain minerals. Ball mills crush by primarily using balls in a long-angled rotating cylinder, while SAG mills use both balls and the material itself for the process. Reliable power
Oct 10, 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)."
Case Studies. Dr Pokrajcic's case studies showed how PRODFINDER helps companies predict and optimise across the value chain (e.g. mine-to-mill). A mineral processing professional with 20 years' experience in the global mineral industry, Zeljka specialises in the commissioning, operation and optimisation of comminution and separation circuit.
analysis performed in a case study, a cost-effective wear measurement method has been suggested, taking the industry requirements into consideration. The wear of mill liners affects the production performance of the mining mill. Hence, the replacement decision for mill liners affects not only the lining cost and the production loss
Analytical solution for the dynamic model of tumbling mills. ... An analytical solution for the dynamic model of tumbling mills is developed. ... Although a SAG mill is chosen as the case study in this work, it can be easily used for other types of tumbling mills such as ball mills. With ball mills, the selection function or breakage rate is ...
2.1 A brief introduction to the mill The mill studied in the present case study has a diameter of 5.7 m and a length of 5.5 m. The power of the electric motor is 1800 kW and the capacity is around 100 tons/hour (experts). Inside the mill, abrasive actions take place due to the comminution of ore, and therefore the inner
When ABB built its first Gearless Mill Drive (GMD) for a cement ... 28MW SAG mill GMD and two 28ft, 22MW ball mill GMDs at Toromocho (Minera Chinalco Peru) at the unprecedented height of 4600m above sea level. by Matthias Neurohr, ABB Switzerland Ltd IRevival of the GMD in cement Mr P Subba Raju, MD Lalitha Cement, and Abdellah Nahdi, senior ...
This article was first published by Mining Magazine, 3 June 2017 and is reproduced here with permission of the writer and editor, Carly Leonida. I would also like to take this opportunity to acknowledge that these algorithms wouldn't be operational, if it wasn't for Newcrest's world class achievement in partnering with a start-up to take...
THE ENGINEERING AND PROCESS EFFECTS OF CHOOSING A MOTOR DESIGN SPEED *A.G. Doll 1 and K. Tischler 2 ... The SAG mill power draw model of Austin (using the calibration by Doll, 2013) is used to predict ... and the gear ratio of the mill bull gear and the drive pinion. CASE STUDY N° 1: CHANGING PINION ON A FIXED SPEED MILL ...
Apr 18, 2016· Sag & ball mill case study of bio kem 1. The Problem Our client experienced a significant water and debris contamination event in the Fixed Bearing circuit of the SAG Mill. The mill was immediately shut down to avoid bearing damage and the contaminated oil was removed and new then oil introduced. 2.
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 …
The Manta Cubewas utilised in the SAG mill and cyanide leaching circuit for improved process optimisation; ... the drive and control system of the winder at Peak Gold Mine was upgraded by the Rockwell Automation® Systems and Solutions Business team. ... Case Studies. We are working with customers around the world. These examples, ...
Jul 31, 2013· This is a great case study of bearing failure which persisted for years, showing it's ugly head every year or two. ... Case Study - Grinding Mill Bearing Failure ... belt driven grinding mill, as shown in Figure 1. The drive spindle has three (3) bearings: two (2) cylindrical roller bearings and one (1) ball …
Case note ACS 1000 variable speed drive increases output and performance of SAG mill LaRonde mine Agnico-Eagle's LaRonde mine has a large gold-silver-base metal deposit and contains the largest reserve resource base of any mine in Canada. Its assumed resource of about eight million ounces is enough to sustain the mine life for 20 years
Case Study: Aluminum Smelter Ball Mill. ... Site engineers also had concerns around their insurance coverage of damage to the mill ring gear drive chain. NZAS hoped that by replacing the ATL start and thus removing the mechanical and electrical stress, it would dramatically improve the reliability of the gearbox/system drive. ...
The Selection and Design of Mill Liners . ... In fact this is generally still the case in the multi-stream plants, where mill liner design and selection is only tackled on a cost consumables basis. ... Was generally used for mill liners (AG, SAG and Ball) prior to the movement to higher carbon content steels. It has excellent wear
Apr 18, 2016· Sag & ball mill case study of biokem Published on Apr 18, 2016 Our client experienced a significant water and debris contamination event in the Fixed Bearing circuit of the SAG Mill.
tumbling mill, such as AG, ball or rod mills. The engineering and process effects ... SAG mill at Cadia (described by Dunne et al., 2001) is ... drive pinion. Case study No 1: Changing pinion on a fixed speed mill A common way of changing the speed of a mill that is
BALL MILL GEARBOX PROBLEM ... In this case since the common factor is 2, we expect to see the ... the 1A Ball Mill Drive under no load. •To determine what problems (if any) existed with the drive, a comparison of the route vibration data between 1A & 1B Ball Mills
BREAKING DOWN ENERGY CONSUMPTION IN INDUSTRIAL GRINDING MILLS ... Figure 3 and Figure 4 for the SAG and ball mill circuits respectively. ... Results from the case studies …
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Industrial Case Studies SAG Mill 2 Ball Mill Simulations of the Mill Power Effect on the Throughput Conclusions. Introduction At the moment, the conventional grinding technologies of SAG and Ball Mills are power inefficient, they use from 3-5% of the total of the energy consumed.
diagnostic studies in many cement plants. The paper describes the approach for the process diagnostic study for the optimisation of a ball mill circuit and is supported with typical case study done by HOLTEC in a 1.5 mio t/a cement plant.
This was a case study for an expansion of a 2200 TPD SAG Mill operation. The client wanted to increase the plant to 2700 TPD @ 30um. Some plant samples were taken, work indexes obtained and data simulated. As it turns out a single 3000HP Vertimill would get that done. The applications of the VERTIMILL continue to expand in number. The variety of applications being tested and operated are ...
manufacture of a Ø40'x29' SAG mill. The mill will be driven by a Gearless Motor Drive (GMD) which, at 28.0MW, is equal to the largest grinding mill power ever used in the mining industry. The SAG mill design is based on Outotec's proprietary grinding mill technology, developed over decades for maximum reliability and performance.