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 [1]. Recently, however, adjustability of Ball mill speed has been given more consideration. Also, to maximize throughput, the …

For instance, in a study conducted on a copper-gold orebody, it was found that the power consumption of an AG mill is 25% to 30% lower than that of a SAG mill for the same capacity. Lower power consumption in AG mills can result in significant cost savings, making them a preferred choice in many mining operations.

The evolution of the Cadia 40' SAG mill to treat the Cadia East orebody – a case study of incremental change leading to operational stability ... An economic approach to optimising mill reline frequency – a case study of SAG mill relines at Rasp Mine Watch . ... Shifting the comminution workload from the primary ball mill to towermill ...

SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed. The SAG mill trommel undersize is combined with the ball mills' discharge and pumped to two parallel packs (clusters) of ...

alone mode (single-stage), or coupled with a ball mill in SAB configuration [2]. Full secondary pre-crushing of the fresh mill feed is an effective alternative to increasing the SAG mill ...

The basis for ball mill circuit sizing is still B ond's methodology (Bond, 1962). The Bond ball and rod. mill tests are used to determine specific energy c onsumption (kWh/t) to grind from a ...

Influence Of Feed Size On AG/SAG Mill Performance Mapping Orebody Hardness Variability For Ag-SAG Crushing And HPGR Circuits Modelling And Simulation Techniques Applied For Optimisation Of Mine To Mill Operations And Case Studies Modelling The Influence On Power Draw Of The Slurry Phase In Autogenous (AG), Semi-Autogenous …

Learn about our Grinding Media case study on changing ball size to differentiate mill performance. More > ME Super SAG 5.5″ Grinding Media Performance ... Ball Charge characteristics provides an estimate of the characteristics of the ball charge in your SAG mill which are important in terms of its grinding and wear performance.

BALL & SAG MILLS WITH THE REXNORD® AUTOGARD® TORQUE LIMITER AND FALK V-CLASS® GEAR DRIVE INDUSTRY: Mining APPLICATION: Ball and SAG mills …

Mill drive example An example of slip power recovery is the wound rotor motor shown below, one of ... typical SAG mill motor drive equipment. Since such drives Figure 3: one of two wound rotor motors for ... saving using the SPR drive, Case 3, is 970kW. Assuming two motors as in the 10,000kW mill example, and an electricity ...

ABC closed circuit, Autogenous-Ball-Mill-Crusher. 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 20-25 mm ore can be accomplished in an autogenous mill.

grade materials are trucked close to the mill, in anticipation of possible future treatment. The concentrator is designed to treat 40,000 metric tons per day of ore to produce 400,000 metric tons per year of copper in concentrate product. It includes two 28' x 14' SAG mills and four 18' x 24' ball mills in closed circuit,

Title: SAG & Ball Mill Case Study of BioKem 1 SAG Ball Mill Case Study of BioKem 2 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. 3

[Show full abstract] (SAG) mill and a ball mill. Currently, the grinding circuits are inefficient in achieving the aspired product fineness of x P 80 = 125 μm even at low to normal throughputs ...

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. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...

The test and study work showed that a single line 42 ft SAG mill circuit gave the most favorable project economics in comparison to an equivalently powered single line 40 ft SAG mill circuit. This paper does not address the process design or the project economics, but instead focuses on the key aspects of the SAG mill design, GMD design and the ...

In this study, having the optimal d_80 for the concentration unit, the mill data, and utilizing the Excel Software and Morrell method, first the total power for the optimal set of d_80 was ...

Considering the continuous increase in production costs and resource optimization, more than a strategic objective has become imperative in the copper mining industry. In the search to improve the efficiency in the use of resources, the present work develops models of a semi-autogenous grinding (SAG) mill using statistical analysis and …

The mill used for this comparison is a 4.4-meter diameter by 13.6 meter long ball mill with a 5000 HP drive motor. It is designed for approximately 90 s.ton per hour. This type two-compartment mill is a state- of-the-art shell supported cement finish mill. The torque and time requirements of the mill with the ball

As the SAG model in JKSimMet does not take account of the variation in breakage rates at different mill loads, the SAG mill load for different A and b values (Table 5) is kept the same as in the base case (Table 4). Simulated throughput was compared with the base case and the results are presented in Table 6, Table 7).

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 ).

The 42 ft diameter SAG mill is the world 's largest and is the first … (7.9m x 12.8m) 15.6 MW ball mills and two VTM-1500-WB VERTIMILLS® for Newmont Mining …. » More detailed! Largest Assel mill in the world commissioned at Hubei Xin …. Largest Assel mill in the world commissioned at Hubei Xin Yegang .

SAG Mill Control . SAG mills can be optimized for maximum ore throughput or maximum grinding energy efficiency. In both cases, precise control of the mill filling percentage is …

results obtained from case studies where optimisation of mine to mill processes were conducted. INTRODUCTION The JKMRC has developed and applied tools to explore ways of improving overall mine to mill

SAG Mill and Ball Mill Case Study. By Ingeteam. In September 2011, the company Outotec, located in Espoo (Finland), awarded Ingeteam a contract for the design and …

The Ball Mill 6 Project, for which Lycopodium has provided engineering, design, procurement and construction support services, is part of the suite of projects that were undertaken to enable the mine to achieve a …

The ball charge is a function of the bulk fraction of the SAG mill volume (Jb) occupied by balls; the ore retained in the mill is the result of the volumetric filling which depends on the ore size distribution (specially the % +6″ and the % −6″ +1″), on the rotational speed (N/Nc) and on the solid concentration by weight fraction inside ...

In the case of the sag mill model the parameters A and b are required. The model then uses these to reconstitute product size distributions from breakage events. In the case of the crusher model a matrix such as …

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general, the bigger the mill diameter, the lower are the mill operating and critical speeds. Thus, for larger mills the number of poles will increase. As a result, the number of poles can vary from 48 to 72 poles (Fig. 3.) with typical mill speed requirements of about 10 rpm for larger SAG mills and about 15 rpm for smaller ball mills. Figure 3.