In this research the most accurate prediction model for SAG mill throughput will be investigated through comparing six machine learning models, including genetic …
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Publisher Summary. For the vast majority of ounces of gold produced, comminution costs in the form of power, grinding media, and liners represent the single largest cost category of milling. Since, semi-autogenous grinding (SAG) ball-mill circuits represent the single largest type of gold milling comminution circuits, the chapter …
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First Online: 13 January 2022. 690 Accesses. 1 Citations. Part of the book series: Lecture Notes in Computer Science ( (LNIP,volume 12702)) Abstract. In mining, the detection of …
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However, the objective of how many mass that the mill can process is limited. Some conditions, such as excessive ore volume, composition, particle size distribution, hardness, underestimated spin speed, incorrect percent solids, among others, can lead to overload. Exists three types of overloads can occur in a SAG mill (Fig. 1). …
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MODELING OF SAG PERFORMANCE UNDER OSD DISTURBANCES 4.1 Qualitative analysis The qualitative effect of changes in ore size distribution (OSD) on the performance of the mill can be addressed using the grindcurves (Powell and Mainza, 2006) of the SAG mill under analysis. The operation of SAG mills is extremely sensitive to …
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Outotec has recently been awarded a contract to deliver one of the largest grinding mills in the world. The contract includes the design and manufacture of a Ø 40' x 29' SAG mill. The mill will be driven by a Gearless Motor Drive (GMD) which at 28.0 MW is equal to the largest grinding mill power ever used in the mining industry.
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The mineral components of the raw ore and pebbles from representative surfaces are shown in Table 1. Among the main valuable components, Zn is mainly found in sphalerite, and Sn is mainly found in ...
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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 ...
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An analysis of the reasons for this reveals that the contributing factors are not only the type of ore dressing process, but also the declining ore head grades and the supply of water to the mines. ... a copper-molybdenum mine in Peru in 2006 and later in 2011, when the SAG mills were completely replaced by 4 HPGRs, each with a capacity of 2100 ...
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Ore-dressing methods fall naturally into two general subdivisions— (1) concentration methods and (2) direct-recovery methods (amalgamation and leaching or wet methods). Concentration methods are employed to remove worthless gangue material and concentrate the valuable minerals of the crude ore in a smaller bulk.
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Two new SAG milling models are developed in this work, able to predict power or specific energy consumption, including the usual design variables such as mill …
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The efficiency of the mill to break ore is a function of both the feed size distribution and the relative hardness of the ore. When the feed size of a SAG mill becomes coarser, i.e. α r increases ...
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The ore in Example I has a specific gravity of 3.4. The computer data input sheet Figure 2 shows the set of data given to the computer to finalize the mill sizing. Figure 3a and 3b gives the results of the computer calculation. The mill power at the pinionshaft for a 30% volume charge is the sum of:
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a SAG mill with an end-discharge grate, a sump and a hydrocyclone. The mill receives four streams as inputs: mined ore, water to assist with material transport, steel balls to assist …
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SAG and AG Mills operate by lifting ore/grinding media and dropping it on the operating bed of the mill charge. High impacts from lifting ore and media promote impact breakage which is the primary mechanism for size reduction in the mill. Via the use of sophisticated instruments and software, we closely monitor the mill impact location to boost ...
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Semi-autogenous grinding mills play a critical role in the processing stage of many mining operations. They are also one of the most intensive energy consumers of the entire process. Current forecasting techniques of energy consumption base their inferences on feeding ore mineralogical features, SAG dimensions, and operational variables. …
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energy required which in this case was to grind the ore represented by the samples, from a feed size F80 of 152 mm to 80% passing 1.7 mm, and a simple adjustment procedure in case the SAG product size needed to be adjusted. Bond rod and ball mill work indices are readily converted to pinion energy for rod and ball mills but not for SAG mills.
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The SAG Mill Cube system graphic shown in Figure 1 demonstrates that the system is fully integrated with the Yokogawa CS 3000 DCS used at Newcrest Mining Telfer Operation and Figure 2 (next page)
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PDF | On Sep 1, 2001, J. Karageorgos and others published SAG milling at the Fimiston plant (KCGM) | Find, read and cite all the research you need on ResearchGate
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If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere. Underground mines are an example: the hoisting capacity of the mine shaft is the rate-limiting step in the process, and the SAG mill must adapt to ...
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It is considered that there is an opportunity to increase production by focusing efforts on reducing the particle size of the SAG mill feed, supported by a mine …
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peak performance and balancing the power available in the SAG mill and ball mill, the transfer size must be measured and controlled. • The transfer size will be 500 microns using a 12mm opening trommel. This can be true under special conditions of operation when treating fine ore at high mill density, but in general the transfer size for
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The ball mill is a rotating cylindrical vessel with grinding media inside, which is responsible for breaking the ore particles. Grinding media play an important role in the comminution of mineral ores in these mills. This work reviews the application of balls in mineral processing as a function of the materials used to manufacture them and the …
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Figure 7: SAG mill power consumption as a function of the proportion of -152 +25mm in the fresh feed for SAG mills of different diameters (after Casili A. and Silva N.,2015) The equation developed ...
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These equations are used by SMCC Pty Ltd to estimate the specific energy of AG/SAG mills under all normal operating conditions, eg ball load, mill speed, feed size and ore hardness and for all ...
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SAG mills find applications in various stages of ore processing and mineral extraction. They are commonly used for primary and secondary grinding, where the ore is further reduced in size. SAG mills are also utilized in the processing of ores to extract …
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Ore size distribution measurements, obtained using a WipFrag R visual sensor, are analyzed in order to obtain a set of variables for SAG modeling and control. …
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Jun 15, 2015. #1. Playing DW20, I've just set up simple automated ore processing using EnderIO's Sag Mill and Alloy Furnace. I'm trying to decide what to do about the other potential uses of the Sag Mill such as clay blocks for making silicon, etc. I've got a general dump-all-the-things chest that goes to storage or to the Sag Mill based on a ...
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End and shell liner design in these mills is much the same as for SAG mills. The effect of liner design on performance is equally as important. For instance, in an iron ore operation using 6.4 m (21 ft.) mills, mill throughput was increased by 15 percent and power consumption reduced by 13 percent by liner redesign alone.
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MODEL PREDICTIVE CONTROL OF SAG WEIGHT. The MPC controller was installed to control the SAG mill weight, the belt weight in the ore feed system, and the SAG mill …
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