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ore hardness. The SAG mill product is then crushed to passing 3.35 mm and is subjected to ... Figure 1 highlights ores from two different projects with both soft and hard SAG milling components to grind from a feed F80 of 152 mm to a P80 of 1.7 mm. The soft ore is characterized by 2 kWh/t and
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The difficulty of stabilizing SAG mill load limits the effectiveness of feedback control approaches. Control is particularly difficult during periods when the feed ore is either unusually hard or fine. There is also a strong tendency to lose control during transient periods when feed ore changes.
The semi-autogenous grinding (SAG) mill at the Phoenix Mine is the largest SAG mill in the United States. "This is a low-grade deposit, so volume is what makes up the difference," said Phoenix ...
Applying grindcurves to mill operation and optimisation M.S. Powella,*, A.P. van der Westhuizenb, ... Clearly this must have implications for mill control, as depending upon the ore type and ball load, the peak ... sag hard oc ag hard oc sag soft oc sag soft cc
Dec 11, 2016· Model Predictive Control for SAG Milling in Minerals Processing. or compounds trapped in the mined ore, so that these can be further considered an intermediate crushing and grinding of ore Ore ...
AbstractA detailed test work was carried out with an industrial semi-autogenous (SAG) mill in a copper plant in close and open circuits to specify the effects of ore characteristics and operational...
Jul 11, 2017· If the ore suddenly goes from very hard to very soft, the cyclone underflow is recycled to the primary mill to maintain a liner protecting load until the ball charge is ground down or the mine can supply some competent rock. This also reduces the load on the ball mill .
SAG precrush Precrushing provides relief to the grinding circuit. It increases efficiency within the SAG mill, increasing overall throughput, or enabling the existing level of throughput to be maintained when ore hardness increases. Good design considers the best selection of crusher and screen to fit the plant layout. Ore sorting
The baseline dataset consists of 15 x hard ore CV01 belt cuts and 3 x soft ore belt cuts. ... Results indicate the SAG mill throughput will increase if the PSD of hard ore presenting to the SAG mill is optimized by: ... improve wall control, grade control, and reduce costs and energy duty on downstream
Our unique Outotec TPL™ technology improves grinding process efficiency – the primary grinding process can be intensified for hard ores and material transport can be improved for soft ores. TPL is an environmentally friendly technology used to achieve higher energy efficiency from the grinding mill.
JKTech Laboratory Services JK Drop Weight Test ... characteristics of a sample of ore in an AG/SAG mill. In an AG/SAG mill, there are two main mechanisms of breakage: impact (high energy) and abrasion (low energy). ... Hard Hard Soft Soft
Sag mill power is ok; Recycle is ok; Speed Rules. Currently because of hard ore conditions the SAG mill speed is run at in fixed speed mode only. In the future, if soft or fine ore conditions are restored, we will commission rules to control the SAG mill speed.
Ore is stockpiled (1) at the processing plant, and the process begins by feeding the ore into a hopper with a loader. The ore is conveyed, and lime is added (2) to raise the pH of the ore. Following crushing through a jaw crusher (3), the ore is fed into the semi autogenous grinding (SAG) mill (4) along with water and steel balls.
SPI; the ore can be relatively soft at . 2. coarser sizes while relatively hard at finer sizes. This can have a significant impact . in a SAG and Ball mill circuit where there ... the capability of the SAG mill to handle more, and vice versa when the SPI value is high.
applications that can benefit from the speed and/or torque control offered by ... l Increases output and performance of SAG mill – improved process control and longer lifetime of equipment (more flexibility) ... soft rock or earth or fragmented hard rock. It could also be used to load the material into the hauling units (trucks) or ...
A structured approach to the evaluation of the energy ... - SciELO SA. for processing cement, diamonds, and iron ore. (Broeckmann and ... and SAG mill circuits in hard ore ... complete comminution circuits using SAG mill and HPGR.
SPI; the ore can be relatively soft at . 2. coarser sizes while relatively hard at finer sizes. This can have a significant impact . in a SAG and Ball mill circuit where there ... the capability of the SAG mill to handle more, and vice versa when the SPI value is high.
Stamp mill,Crusher, AG mill, SAG mill ... Hammer- and hammer impact mills are sui table for crushing soft to medium hard m ... Three different milling time of copper ore in laboratory ball mill ...
Model Predictive Control for SAG Milling in Minerals Processing | 5 Model Predictive Control on a SAG Mill and Ball Mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure.
Hard and Soft Rock Mining Screening Primary Crushing Coal Preparation ... Concentration Classification Water Tailings Pond Flotation Separation Conditioning Grinding Water SAG/Ball Mill Primary Crushing Ore Storage Leaching Leached Solution Dryers Electro-Winning Solvent Extraction Electrolyte ... – Drives and process control systems ...
Apr 24, 2014· Increased production and energy efficiency for optimized Antamina mine. ... control, ore dilution and environmental aspects. ... Two antennas were installed at Antamina – one on the primary crusher product belt and the other on the SAG mill feed belt – thus allowing the performance in the crushing and milling circuit to be linked to the ore ...
UQ eSpace - University of Queensland. AG mills exclusively use ore as grinding media, while in SAG mills steel balls are ... between the various components inside an AG/SAG mill in terms of particle breakage, transportation and ..... 2.4.4 Mechanistic Breakage Energy Calculation .
ore hardness. The SCSE was developed by extensive modelling over a range of A*b, ta and SG values, using the concept of a 'standard' SAG mill with pebble crusher circuit. The JK Bond Ball Mill (JKBBM) test, is a locked cycle grindability test conducted using a standard laboratory Bond Ball Mill with the same steel ball charge and
UQ eSpace - University of Queensland. AG mills exclusively use ore as grinding media, while in SAG mills steel balls are ... between the various components inside an AG/SAG mill in terms of particle breakage, transportation and ..... 2.4.4 Mechanistic Breakage Energy Calculation .
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