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.

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.

South African Sag Mill On Soft Ore T22:02:41+00:00 Pilot And Laboratory Test Procedures For The Design Of. internal mill volume hence the term SAG or semi-autogenous grinding, but can be as high as thirty per cent. SAG mills ...

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 …

south african sag mill on soft ore in zimbabwe. south african sag mill on soft ore ball mills and sag mill problem How to Improve SAG Mill TonnageGrinding Classifiion Jun 17 2018 Sometimes facing the excessive hard ores in the SAG mill is a challenge for or decreasing mill throughput are the solutions for this problem

Soft 3 samples 1, 8, 9 16.7 17.6 14.8 Soft ore in SAG is hard in ball mill. SAG, RM ~equal Feed F80 for Test 19 10 2 SAGDesign F80 is almost double rod mill Wi test. The hard ore composite represents information that has never been identified before soft Bond ...

The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 years, but the ability to simulate the effects of blending hard and …

The primary grinding mill is an 18 ft. diameter x 9 ft. EGL, 1500 HP variable speed SAG mill and the secondary mill is a 13 ft. diameter x 21 ft. long, 2000 HP fixed speed, ball mill. When hard ore was treated, the SAG mill restricted …

Session 14: Plant Start-Up - AG/SAG Mill Circuits Commissioning and Operation of the Mt Carlton Single Stage SAG Mill AndrewCervellin Commissioning of Sandfire Resources Copper Processing Plant at Degrussa, Western Australia SanjeevaLatchireddi New projects in Russia for Hard and Soft Ores with SAG Mills Selected from the Results of SAGDesign ...

Sag Mill Ore Hard Soft Control in How Much Crusher[], this type of mill combines crushing and grinding. it utilizes two or three wheels running . GET PRICE. Hard rock pabrik crusher 10 t h .

We applied the proposed methodology on two SAG mill datasets, of one year period each. Results show accuracies above 80% on both SAG mills at a short upcoming period of times and around 1% of misclassifications between soft and hard characterization.

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 ...

South African Sag Mill On Soft Ore. The South African style SAG (RoM) mills operate in a window that is almost exclusive from the operation of the Australian and North American mills that have been used for the development of SAG mill models. Combining good quality test data from the RoM mills is extending and improving these models, and ...

Hard Ore (88% Full) Hard Ore (12% Full) Soft Slurry (Mud) 1. Hard/Normal Ore has a well defined toe area vs. none for the muddy type 2. Liner Damage is a measure of the sharpness of the polar plot in an predefined arc in the toe region. 3. As the mill empties, the toe signal begins to sharpen and is a good indicator of when balls are striking ...

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 mills grinding media includes some large and hard rocks, filled rate of 9% – 20%. SAG mill grind ores through impact, attrition, abrasion forces. In practice, for a given ore and equal processing conditions, the AG milling has a …

For example, hard or coarse ores might bottleneck the SAG/AG mill throughput, while the ball mills might constrain throughput when milling soft or fine ores. Because the power draw of a ball mill is fairly constant compared to that of a SAG/AG mill, periods of SAG/AG mill bottlenecks lead to increased ball mill circuit specific energy ...

Ore types can respond with a characteristic hardness ... (SAG) mill in the first project, and more energy in the secondary (ball) mill for the second. ... of the coarse tests agree on which samples are hard or soft; whereas it does not at the medium-sizes (A×b, WiRM). Nº 82

sag mill trommel for iron ore - BINQ Mining. Nov 30, &#; sag mill trommel for iron ore - Grinding Mill China, hard ore was treated, the SAG mill restricted the …

Sag Mill Ore Hard Soft Control. Saudi Arabia Mining Industry Gold Ore and Copper Ore Mining. Copper ore ball mill produced by SBM can be widely used for the mineral materials. This ball mill can be used for dry and wet grinding of different materials such as the limestone copper ore cement materials etc. .

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 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).

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.

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.

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.

The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 years, but the ability to simulate the effects of blending hard and …

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 …

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.

operational relative-hardness. We applied the proposed methodology on two SAG mill datasets, of one year period each. Results show accuracies above 80% on both SAG mills at a short upcoming period of times and around 1% of misclassifications between soft and hard characterization. The proposed

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.

(P-G) ores, and significantly harder than P-G ores in terms of ball mill grindability. But Portage E (Pushback) ore is the hardest in terms of competency or crushing yet is still relatively soft in terms of grindability. The other finding worth noting is that Vault ore has a lower SG, which means the SAG mill would draw less power at the