south african sag mill on soft ore Description. SINGLE STAGE SAG/AG MILLING DESIGN - Metallurgy. UG2 ores (South Africa), Yanacocha 5 Low ball charge, high speed SAG mill (4% ball charge, 90% Nc) A cross between AG and SAG for average competency, abrasive ores.

• SAG Mill Design Test (Starkey, 2006). There are reasonable correlations between all the tests' data that generally allow any or all of the data to be used to design a SAG mill based grinding circuit for 'typical' ores of a moderate competence range. Issues have arisen where the expected SAG mill specific energy is greater than 10 kWh/t.

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 …

of one 40x 22ft (21,000 kW) SAG mill working with two 26 x 38ft (15,500 kW each) ball mills, the SAG mill currently being the largest of its kind in the worldSAG mill trommel . oversize product (pebbles) is sent to the pebble crushing plant, consisting of two pebble crushers in parallel. Crushed pebbles are returned to the coarse ore stockpile.

1. Introduction. The Run-of-mine composition strongly affects autogenous mill operation. However, the effects of a varying ratio of hard and soft components in mill performance are not described by the current generation of AG/SAG models (Stange, 1996).For example, current JKSimMet models (Napier-Munn et al., 1996) assume a uniform feed, and …

Maximise ore characteristics and increase productivity with our powerful JK Drop Weight Test - an industry standard for use in characterising ore under AG/SAG milling conditions. The JK Drop Weight Test provides ore specific comminution parameters that are used in the JKSimMet software to analyse and/or predict crusher and AG/SAG mill performance.

Detailed descriptions of the test equipment, procedures, and calibration are provided, and it is proposed that this become an open standard procedure for SAG mill hardness testing, particularly for soft to medium-hard ores, over which range the test is most effective.

SAG Mill Control It Shouldnt be that Hard. SAG Mill Control It Shouldn't be that Hard An economically appealing method for improving operations is available without the capital expense get more out of a mill by applying the SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill andor manipulating the rotational speed

Hard ore grinding resulted in finer products, compared to the soft ore milling. The softer ore is ground chiefly via the impact breakage whereas the stronger ore is subjected to abrasion and attrition events where the media impact …

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.

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Sag Mill Ore Hard Soft. Home Sag Mill Ore Hard Soft. PEW series Jaw crusher features big crushing ratio, reliable operation, easy maintenance and low operating cost. It is the ...

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 mm. The soft ore is characterized by 2 kWh/t and 2 0 0 6 Manta Controls

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 …

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.

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.

However, the effects of a varying ratio of hard and soft components in mill performance are not described by the current generation of AG/SAG models (Stange, 1996). For example, current JKSimMet models (Napier-Munn et al., 1996) assume a uniform feed, and describe it using a single set of average ore breakage function parameters (A, b and t a).

home; sag mill ore hard soft; sag mill ore hard soft. Medium hard to very hard Slightly abrasive Dry or wet not sticky 61 to 81 Sand amp gravel recycling Vertical shaft impactors autogenous Soft to very hard No limit Dry or wet not sticky 21 to 51 Quarried materials sand amp gravel Mineral sizers Hard to soft Abrasive Dry or wet and sticky 21 to 51 Heavy mining Crusher

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.

THE APPROPRIATENESS OF THE TRANSFER SIZE IN AG AND SAG MILL CIRCUIT DESIGN S. Morrell SMCC Pty Ltd Pty Ltd 220 ... 2. what the appropriate T80 value should be for a given ore type, circuit configuration, mill geometry and operating condition 10 100 0.01 0.1 1 10 ... Cum % passing hard soft medium medium-hard very hard typical cyclone overflow ...

sag mill ore hard soft control. JKMRC researchers tackle SAG mill fill productivity challenge with new 'soft sensor' Posted by Daniel Gleeson on 3rd April 2020 Researchers from the Sustainable Minerals Institute's Julius Kruttschnitt Mineral Research Centre JKMRC say they are developing a soft sensor to overcome previouslyaccepted performance challenges facing …

DOC Main text Gurubasayya Swamy. The mill performance is poor when the mill feed is all time with very little ore larger than 3 inch CONCLUSIONS Based on the results obtained from the performance study on SAG mill the following conclusions are made From the study on effect of mill load balls load on SAG performance it can be concluded that mill performed better at mill...

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.

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.

Hard rock is associated with high specific energy consumption, and soft rock, with low specific energy consumption. Keeping the throughput constant, but selecting high or low specific energy consumption blocks for the SAG mill feed allows the energy requirement to be managed, while satisfying the production.

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 ...

The SAG mill was sized with 746 kW to give a 25% contingency for power swings on the calculated power. The ball mill was sized at 1120 kW. Total installed power for comminution exceeded that required for conventional grinding by a factor of 1.163 (including secondary crushing).

2015-11-12 · •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

Hard ore grinding in the SAG mill resulted in finer products compared to the soft ore milling. In addition, it was found that the products of the soft ore milling were more elongated, angular and less rounded than those of the hard ore milling. This was attributed to changes in breakage mechanisms as ore strength changes.

Effects Of Ore Characteristics On Product Shape Properties. Hard ore grinding in the sag mill resulted in finer products compared to the soft ore milling in addition it was found that the products of the soft ore milling were more elongated angular and less rounded than those of the hard ore milling this was attributed to changes in breakage mechanisms as ore