In [5,6], the correlation between acoustic emissions, hardness, and feed size in SAG mills was studied using machine learning models. In [ 7 ], a deep learning approach to study mineral hardness and predict related values is presented.
The inferential models of the SAG mill discharge, inventories and feed will be described following a review of related works and the presentation of the relevant simulation models. The review is divided into mill charge and discharge measurement and feed size distribution measurement.
The capacity of the SAG mill is related to lots of factors such as feed size, size distribution, discharge size and grindability, etc., and it should be confirmed according to the actual situation. SM40*14'——means it is a dry mill.
The operations of AG/SAG mills are known to be sensitive to the changes in feed particle size distributions presented to the mill [].The variation of feed particle size significantly affects the overall process control, product quality, and economic performance of the mill [2,3,4].Poor product quality from the AG/SAG mill poses significant challenges to downstream processes such as flotation ...
Silva et al. [64] fit a power equation and an energy equation specific to the design of SAG mills, using them to predict energy consumption as a function of mill size, internal load level and ...
A relationship between t a and the feed size distribution parameter F 80 for a SAG mill were developed at the JKMRC (Morrell and Morrison, 1996). For the three samples above, the t a is very similar and the average t a is Based on this value, the SAG mill feed size distribution for a parameter F 80 would be 104 mm.
The purpose of the primary crusher is to reduce the ROM ore to a size amenable for feeding the secondary crusher or the SAG mill grinding circuit. The ratio of reduction through a primary crusher can be up to about 8:1. Feed: ROM up to m. Product: 300mm (for transport) to 200mm (for SAG mill) Feed Rate:
SAG mills have special requirements on feed size distribution, which is influenced by the size distribution of the blasted rock (Esen 2013). The 80% passing size, x 80, is regularly used to ...
The main target of this research was to provide the optimal size of mills' feed with acceptable accuracy, in order to find the size range of particles to achieve the maximum grinding product. ... Nowadays, experimental semiautogenous (SAG) mill and dropweight test are used for evaluation of grinding circuit regarding changes in feed ...
Product Size: All passing 6 mesh with 80% passing 20 mesh. Net power from pilot plant: KWH/ST. Mill, gear and pinion friction multiplier: Mill Power required at pinionshaft = (240 x x ) ÷ = 5440 Hp. Speed reducer efficiency: 98%. 5440 Hp ÷ = 5550 HP (required minimum motor output power).
Analysis of the recorded mill acoustic response using statistical root mean square (RMS) and mill discharge sizes showed that the introduction of fresh feed with varying hardness and size distribution considerably altered the mill product undersize of −150 μm and acoustic emission.
In the mineral processing sector, a common approach to expanding a SAG mill circuit is the addition of secondary or tertiary crushing to reduce the size of the mill feed. The addition of precrushing can increase the throughput of an existing SAG mill circuit by 10% to 30% or more, depending on the nature of the ore and the crushing
The IES simulation results indicated that using Mine to Mill strategy by maintaining the target size (P80) at 200 µm, improved economic performance by per cent relative to the base case.
In this video presentation an historical perspective of the origins of MinetoMill is described and is followed by a discussion of how AG/SAG feed size affects throughput and specific...
size depending on the required mill feed rate and ore hardness. Figure 3 Meadowbank milling flowsheet . Crushed ore is conveyed to a covered stockpile with an 8,500 t live capacity. Two variable frequency drive pron feeders reclaima the stockpiled material to a conveyer belt feeding the SAG mill in the primary grinding circuit.
Feed size effects what size is important? historically, MinetoMill has focussed on blasting alone generation of more fines • pass through SAG mill onto ball mill circuits • higher throughput ( 10% to 30%) • coarser grind size (possibly) fine <25mm medium 25 75mm coarse >75mm
Based on experience, millliner designs have moved toward more openshell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebblecrushing circuit utilization and SAG mill capacity. As a guideline, mill throughput is maximized with shell lifters between ratios of :1 and :1.
Common convention generally refers to highaspect ratio mills as SAG mills (with diameter to effective grinding length ratios of 3:1 to 1:1), lowaspect ratio mills (generally, a mill with a significantly longer length than diameter) are also worth noting.
It was also observed from the plant survey that there was a high re circulating load of fine material to the SAG mill amounting to t/h affecting mill capacity as this took space and limited the capacity for new feed. Using ModSim simulator, incorporation of a 100 micron screen on the cyclone underflow stream was simulated.
In many mine to mill type studies (Simkus and Dance, 1998, Kojovic, 2005, Michaux and Djordjevic, 2005, Morrell and Valery, 2001 and many others) has been demonstrated the influence of the feed size distribution in the SAG mills throughput, power consumption and accordingly, specific energy.
charge, 74% of critical speed and a new feed size (F 80 ) of 142mm. A SAG mill feed size (F 80) was then chosen on the basis of the JKMRC ta F 80 correlation which indicated that a 200mm closed side setting in the primary crusher should give a SAG feed F 80 of 153mm ± 15mm. The JKMRC comminution database was searched for a copper ore with ...
When the feed size of a SAG mill becomes coarser, α r increases, the energy required to break the ore increases, φ r and φ f increases (Morrell et al., 1996; Morrell and Valery, 2001 ...
As the feed size distribution commands the charge volume and thus the SAG mill power draw associated with competent ores, various industrial operations later included additional crushing stages for increasing the throughput of existing SAG mill circuits . In the case of such modification, the SAG mill product is coarser compared with the ...
... January 2007, two complete grinding circuit surveys were performed followed by a SAG mill crash stop and grindout. After stopping the mill, a SAG mill feed sample was also...
When the SAG mill feed size dropped to around 80% . passing 80mm, recycle pebble rates approaching the design level were . achiev ed even with new grates installed and SAG mill throughput would .
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