Sag Mill Ore Hard Soft Control; Sag Mill Ore Hard Soft Control. media. They use ore exclusively as their grinding media but if the hardness and abrasiveness of the ore does not lend itself well to full AG milling, then a small charge of steel balls (6 to 15 % by mass) is added to assist in size reduction.
SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. A SAG mill with a 44' (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are characterized by their ...
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 and prevents overloading the circuit.
SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill. The best way to measure load is to mount the mill on load cells. The load cells are calibrated to measure the total weight of water, grinding media (balls) and ore in the mill ...
Antamina Compania Minera Antamina S.A. Peru Project: One SAG Mill and 3 Ball Mill Drive Systems Capacity: SAG Mill 1000 t/h Ball Mills 1000 t/h Consultant: Bechtel, USA Mill Builder: FFE Minerals, USA Mill Size: SAG Mill 38 feet/11,58 m Ball Mills 24 feet/7,32 m Ore processed: Copper/Zinc Drive Rating: SAG Mill 20,1 MW, 9,23 rpm Ball Mills 11,2 MW, 11,38 rpm
Model Predictive Control Rockwell Automation. Softer ore would require mill speed decrease to maintain a satisfactory ore bed while protecting the mill liners from direct impact conversely for hard ore mill speed is increased to input more energy to the process and improve the tumbling action to deliver speed to process the material from the sag mill and control the final grind
Sag mills for iron ore - bio7-biogas.Be.Sag mill trommel for iron ore - maneco.Home sag mill trommel for iron ore.Sag mill trommel for iron ore.Classic case.150-200tph cobble crushing plant vietnam is an important mining export country in asia, especially the exportation of limestone, iron ore, coal, granite and bluestone products.
For design purposes, you need an estimation or prediction of your SAG Mill's tonnage; well, there are 3 ways to generate good rock "ore" hardness testing data for SAG and ball mill circuit grindability from half drill core. We can abbreviate the discussion by saying there are three "religions" of grinding, and there are small-scale tests suitable for all three of the …
Sag Mill Ore Hard Soft Control. We are a professional mining machinery manufacturer, the main equipment including: jaw crusher, cone crusher and other sandstone equipment;Ball mill, flotation machine, concentrator and other beneficiation equipment; Powder Grinding Plant, rotary dryer, briquette machine, mining, metallurgy and other related equipment. which can crush all kinds …
Aug 28, 2014· 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. Each decision cycle the expert system will calculate a change in the SAG mill speed set point.
Choosing a SAG Mill to Achieve Design Performance. the correct power required to grind ore in a SAG mill, by developing ore, full-scale tests it will prove to be essential to monitor and control the load in, production when milling hard ores may not be a problem if the amount of ore, not be a problem if the downstream process can handle extra tonnage when the ore is soft.
i. For very hard ores SAG mill. For soft ores and all FLOTATION TECHNOLOGY use HPGR. ii. Before taking decision consult Experts in Mineral processing for FLOTATION. iii. Do compare results of metallurgy for both. ivDo cost benefit analysis. v. Develop operator knowledge in controlling OPERATING PARAMETERS as per design, not as per fancy ideas ...
In many mines, the multi-component grinding is inevitable, and the ratio of hard and soft components in the mill strongly affects mills operation and performance. Bueno (Bueno et al, 2010; Bueno et al, 2013) studied the effects of blending hard and soft ores in AG/SAG mills and used them to update the JKSimMet toolkit which was a steady state plant simulation …
Sag Mill Ore Hard Soft Control SAG mill 4 ball charge 90 Nc A cross between AG and SAG for average competency abrasive ores. Typically operated in RSA on Witwatersrand Gold Ore Driefontein Underground Kloof Jacobina 6 SAG mill with recycle crusher 8 15 ball charge Competent ores better suited to coarse grind sizes.
Download A Paper Describing SAG Mill Control Using TheKnow More. operability and control of grinding circuits where direct tipping and ore SAG mill control on two sites in Australia that have adopted the new control technology the mill is being worked harder and using more of the available power draw. consists of three coarse ore feeders and one soft ore feeder supplying …
FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v. UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 0.5 1 1.5 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore's compentency. Figure 8 plots this ratio versus UCS; no trend is apparent ...
This is achieved by using two stockpiles of limited capacity, to classify ore as hard or soft, depending on its expected grindability (Fig. 3). The SAG mill will draw from one of the two stockpiles at will to minimize the energy cost. If one of the stocks is emptied, the ore from the other stockpile is used.
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.
Sag Mill Ore Hard Soft Control. Automation Advanced Control Solutions. present both in the ore feed system and within the mill itself. Additionally, BrainWave automatically adjusts its control settings to allow for different operation due to changes in ore hardness over time.
· •SAG/BALL mill with 2 leach and 6 CIL •100 % soft ore Phase II 2006 Increase capacity 5.8Mtpa •Addition of Gyratory Crusher for processing of hard rock. •Increase production to 8Mtpa with internal initiatives •Elusion 4t to 6t vessels Phase III 2009 Increase capacity to 12Mtpa •Addition of 2nd Ball mill, pebble circuit, gravity upgrade
sag mill ore hard soft control ball mills iron ore - A salvo del olvido How To Design A Iron Ore Ball Mill - Different Driver Ball mill for iron ore grinding mineral or material into fine powder such as gold iron,zinc ore copper etc. Iron Ore Processing for …