Mining SAG Power Index (SPI) Test. It is a measure of the hardness of the ore from a SAG or AG milling perspective. The test is a batch test, run with 2 kg of ore in a standard 10 cm diameter by 30 cm long mill, and it measures the time (in minutes) required to grind a sample from 80% passing 12.5 mm to 80% passing 1.70 mm.

Feb 12, 2020· The SAG Mill is a machine added by Ender IO.It uses Micro Infinity (µI) to grind (or mill) items into their crushed variants, like Ores into Dusts.The SAG Mill has four output slots; recipes can have 1-4 different outputs, with different chances of obtaining those outputs. Uniquely, the SAG Mill can use Grinding Balls made from various materials to increase energy efficiency (resulting in

The SAG Grindability Index (SGI) test, or alternatively the trademarked SAG Power Index (SPI), is a SAG-specific test involving a small batch SAG mill that is charged with a two kilogram ore sample and ground until the product has achieved an 80% passing size of 1.7 mm.

The SAG Power Index (SPI) test (Starkey & Dobby, 1996) uses a benchscale SAG mill test to determine the specific energy of an industrial SAG mill. The test is operated in closed circuit and the time required to grind the material to a P 80 of 1.7 mm is used to predict AG/SAG

1. Verify that the MinnovEX SAG Power Index (SPI) Test provides a good measure of ore hardness for a given SAG operation. This was accomplished at each site by taking samples from operating periods with soft, medium and hard ore. 2. Develop power correlation data for the operating SAG mills to establish in-plant correlation factors,

1. Verify that the MinnovEX SAG Power Index (SPI) Test provides a good measure of ore hardness for a given SAG operation. This was accomplished at each site by taking samples from operating periods with soft, medium and hard ore. 2. Develop power correlation data for the operating SAG mills to establish in-plant correlation factors,

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

Benchmarking: SAG Mill Power Draw Meadowbank Muteb, P. & Allaire, J.,Meadowbank Mine Process Plant Throughput Increase,Proceedings of the Canadian Mineral Processors Annual General Meeting, Ottawa, Canada, January 2013.

of the energy required by a SAG mill. Put another way, the SAG mill energy required according to this statement, is 2.5 times more than the Ab value to produce the same degree of particle breakage. There is a speci ﬁ c gravity factor that affects AG/SAG power draw. The lighter material, in the 2.5 speciﬁ c

SAG-mill Power Index® (SPI) Test. The SPI® test is carried out in a standardised mill under set conditions, with the output being the time to reach a given size, which can be converted to a SAG mill specific energy input (in kWh/t). The SPI® index provides a profile of the hardness of the ore type and can be used for geometallurgical models.

In contrast Ausgrind uses a Bond-style power model to estimate total specific energy and an empirical model to estimate the SAG mill Ecs as a function of DWI (or other comminution parameters), as

the SAG mill critical speed; Pc = SAG mill power consumption (kW); % 600 +100 = % of the fresh feed in the size range 152 +25 mm. M. Silva, A. Casali/Minerals Engineering 70 (2015) 156–161 157 In fact the later can be modelled as a function of the others.

An updated data set for sag mill power model calibration This paper expands the SAG mill survey database published by the Author at Procemin 2013. The new database includes 49 published SAG/AG mill surveys and includes mills from all over the world.

The Simple SAG Mill is a machine added by Ender IO.It uses Micro Infinity (µI) to grind (or mill) items into their crushed variants, like Ores into Dusts.The Simple SAG Mill has four output slots; recipes can have 1-4 different outputs, with different chances of obtaining those outputs.

Equipment Specification Sheet: SAG Mill,Ball Mill Work Index 122 metric Feed to SAG Mill 80% passing 150 mm,SAG Mill Pinion Power 1155 kW. INNOVATION NEWS Mills and GMDs ABB. Mills and GMDs Maarten van de,reliable drive system for SAG mills Early SAG mills had a diameter of about 32’,,SAG mills with a rated power of up to 35 MW

Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.

mill is the energy consumption. The power supplied to the mill is used primarily to lift the load (medium and charge). Additional power is required to keep the mill rotating. 8.1.3 Power drawn by ball, semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential

2005), the SMC Test® drop weight test index (DWI) (Morrell, 2004), the SAG power index (SPI®) (Starkey & Dobby, 1996) and Bond ball mill work index (BWI) (Bond, 1961), provide unquestionable margin of design safety in the plant (David, 2013). However, this approach does not consider the inherent

The SAG Power index also known as the Starkey SAG Test, also known as the SAG Grindability Index Test Procemin 2013 In this paper, the authors undertake a critical review of the Starkey test and the publicly available infor- mation related to the test equipment, procedures, and scale-up methodology.

Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.

mill is the energy consumption. The power supplied to the mill is used primarily to lift the load (medium and charge). Additional power is required to keep the mill rotating. 8.1.3 Power drawn by ball, semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential

2005), the SMC Test® drop weight test index (DWI) (Morrell, 2004), the SAG power index (SPI®) (Starkey & Dobby, 1996) and Bond ball mill work index (BWI) (Bond, 1961), provide unquestionable margin of design safety in the plant (David, 2013). However, this approach does not consider the inherent

The SAG Power index also known as the Starkey SAG Test, also known as the SAG Grindability Index Test Procemin 2013 In this paper, the authors undertake a critical review of the Starkey test and the publicly available infor- mation related to the test equipment, procedures, and scale-up methodology.

Tumbling mills, eg AG, SAG, rod and ball mills Conventional reciprocating crushers, eg jaw, gyratory and cone HPGRs Tumbling mills are described using 2 indices: M. ia. and M. ib. Crushers have one index: M. ic. HPGRs have one index: M. ih. For tumbling mills the 2 indices relate to “coarse” and “fine” ore properties plus an

A further explanation is required to explain the importance of designing the SAG mill chamber to draw required power at optimum operating conditions of 75% critical speed and less than 30% by volume load. Recent studies in the three-foot diameter SAG mill are instructive. The following graph shows the relevant facts as Figure 2.

work indices for the AG/SAG mill and ball mill can be re-organised as [7] and [8], where B’Wio and A’Wio are the corrected operating work indices and WAG/SAG, WBM are the respective power draw of AG/SAG and ball mills. Note that the ball mill operating work index is applied only on the portion that needs the additional grinding (Q2),

SAG mill optimisation using power-based simulations Author Dr. Rajiv Chandramohan, Robert Braun, Greg Lane Paper presented by Dr. Rajiv Chandramohan at

The mill reportedly rotates at 70% of critical velocity (Verret et al., 2011), or 54 rpm (Gonzalez, 2000).There is controversy surrounding the mill rotational speed. The calculation of mill critical velocity (V c) is derived from the balance of gravitational force and the centrifugal force acting on a ball, and is given by Eq., after Austin and Concha (1994) (1) V c = 42.2 (D-d) where D is the

the required SAG comminution of test ore material. Specific energy consumption (SEC) measured in kWh/t is a ratio of the mill drive power to the milling circuit output, without regard to circulating load. At the constant size of the cycle feed and discharge, SEC is a prime characteristic of material grindability in a certain ore pretreatment

Metso has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of your mill.

PERFORMANCE ENHANCMENT TOOLS FOR GRINDING MILLS 103 The need for new instruments consequence has been that as long as the mill is consuming the expected power, there is little concern about the class of Operation of large SAG mills requires a change in the conceptual approach to grinding processes.

SAG Mill Circuit Example Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill

Dec 12, 2016· Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size

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