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 ...
Case Study: Aluminum Smelter Ball Mill. NZAS Aluminum Smelter extends ball mill life by 300% using MVS starter. Located on the Tiwai Peninsula, New Zealand Aluminum Smelters Limited (NZAS) is one of the world’s largest aluminum smelters.
Breaking down energy consumption in industrial grinding mills. ... Three SAG/ball mill circuits were surveyed revealing that on ... Case studies are presented to illustrate the current state of ...
An electrical impact study between variable speed dual pinion mills and gearless mill drives Abstract: Conventional mining process circuits use both Semi-Autogenous Grinding (SAG) and Ball mills. It is very common that the SAG mills are operated with adjustable frequency drives (AFDs) and the Ball mills are operated at fixed speed .
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.
A comparison of wear rates of ball mill grinding media ... A comparison of wear rates of ball mill grinding media.pdf ... modelling methodologies are discussed and demonstrated by means of a case ...
04 How to manage and store Pattern. The management and storage of the mold directly affects the delivery time of the product, and even affects the surface quality of the product If the effective management of the mold and mold storage, many companies are not a See more; 03 Why use ultra-wave detection for the hammer
May 08, 2015· Before making a change in the SAG mill ball size it is important to test it first in simulation. ... Case Study: Coarser Feed to a SAG Mill - Duration: 6:21. Minerality 46 views.
The ball mill is a tumbling mill that uses steel balls as the grinding media. The length of the cylindrical shell is usually 1–1.5 times the shell diameter (Figure 8.11).The feed can be dry, with less than 3% moisture to minimize ball coating, or slurry containing 20–40% water by weight.
The IntelliSense.io team was responsible for the following key tasks: reducing mill shutdowns through predictions of ball charge and liner states, reducing the frequency of SAG mill overloads, and increasing the controllability of the grinding circuit. Challenges. Limited knowledge of changing ore properties lead to; Frequent mill overloads
• The starting of the mine’s four 6 MW ball and SAG mill motors: ̶ draws 130% rated full load current ̶ takes up to 20 seconds to start ̶ drops the 11 kV bus voltage to 84% ̶ causes other loads to trip on under voltage ̶ impacts the 132 kV transmission voltage • The mine’s 8 MVAR D-VAR® STATCOM was installed on its main 11 kV bus
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
[Case Study] Sag Mill and Ball Mill Liner Replacements. On April 7th an ICS crew completed the installation of over 6 tons of rubber lining used to protect both the mill and prolong the life of the liners in a 34’ diameter x 20’ long sag mill. All projects are completed to the safety standards and practices set forth by the mine site.
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 …
In this paper, a case study is presented benchmarking actual plant data against Ausgrind model predictions, validating the calculation improvements. Comparisons of actual and predicted data show improved response of the program for variable operating conditions. For more information please contact Dr. Rajiv Chandramohan.
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
ABB’s scope of supply included four dual pinion low-speed mill drive systems for two semiautogenous (SAG) and two ball mills, each consisting of two synchronous motors, converter transformers and ACS6000 frequency converters including active rectifier units that allow the mill drives to achieve a power factor of 0.90 leading.
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 Study: Aluminium Smelter Ball Mill. NZAS Aluminium Smelter extends ball mill life by 300% using MVS starter. Located on the Tiwai Peninsula, New Zealand Aluminium Smelters Limited (NZAS) is one of the world’s largest aluminium smelters.
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.
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 for their …
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)
TAKING CONTROL OF THE MILL FEED CASE STUDY - PARTIAL SECONDARY CRUSHING MT RAWDON Brian Putland ... the SAG and ball mill. Diverting primary crushed ore to a surge bin ahead of a secondary crusher, ... drive train were 7.5% of the power measured at the motor input. This accords with industry norms, Table 1.
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
The researchers’ case study showed the device resulted in a 40% reduction in comminution energy and a 12% reduction in overall site operating cost. Dr Pokrajcic said the entry was a clear standout in the Technical Research category, presenting high quality research that was well supported by strong technical information and cost analysis.
Big data blasts into mill efficiency and productivity studies. PETRA is excited to introduce our new PRODFINDER big data integration and machine learning algorithms. These algorithms make it possible to conduct low cost big data “mine to mill” type projects without site trials!
Because the SAG mills at Lihir are critical pieces of production equipment, and there’s no way of diverting material, it was really important to avoid these events wherever possible.” Indeed, every minute of downtime equals lost production, and the power draw (and cost) required to restart a SAG mill …
mill means it is suitable for a wide variety of processes and offers other benefits such as minimised energy usage of up to 40-50% compared with traditional ball mills (see Fig. 1 overleaf). HIGH INTENSITY GRINDING AT ITS FINEST Authors: Mattias Åstholm, Andres Paz, Eddie Jamieson Illustration of 3 x Outotec HIG3000.
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
CASE STUDY: PROMINENT HILL. Organisation. Oz Minerals. Site. Prominent Hill, South Australia. Year. 2010. ... Installing a new shell lifter on the SAG mill using the reline machine. Output SEAP April 2013 / 8 path. This continual focus on ... of the SAG and Ball mill was executed on site with ‘zero harm’ to personnel, equipment or the