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sag power index test spi ppt

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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 scaleup methodology... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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  • An Overview Of the SmAllScAle teStS AvAilAble tO

    SAG POwer index SPi teSt The SAG power index SPI was developed by John Starkey 7 and is offered by MinnovEX Technologies Inc The SPI expressed in minutes is defined as the time T necessary to reduce an ore sample from a K 80 of ½” to a K 80 of 17 mm The batch test is carried out in a laboratory mill of 12” diameter x 4”

  • PDF Powerbased comminution calculations using Ausgrind

    • The SAG Power Index SPI test was developed by S tarkey and Dobby Starkey and Dobby 1996 as the AGSAG equival ent to the work index test A SAG mill is operated in closed circuit

  • The application of the sag power index to ore body

    The SAG Power Index test SPI is a tool for forecasting autogenous mill performance Much effort has been directed towards the development of the process models relating SPI to throughput estimates but little has been directed towards ore body modeling

  • A public Database of tumbling mill grindability

    • CI – The Minnovex crushing index determined as part of a SPI determination unitless • SGI – The SAG Grindability Index or SAG Power Index minutes • Ai – The Bond abrasion index unitless The litho database table includes the following fields • Drillhole –


    In addition to the Bond Work index test BWi the SAG Power Index SPI was developed by MinnovEX Technologies Inc to estimate power requirements of a SAG or AG mill MinnovEX 2000D The resulting data was to be used for forecasting throughput in the existing milling operation at the time The initial programs developed in 1999 MinnovEX


    80th percentile value of a key measure such as the JK drop weight test Axb parameter NapierMunn 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

  • Sample Preparation Flowchart

    A 23 kg sample was split out from each VC for SAG Power Index SPI testing In addition coarse particles were removed for SAG Mill Comminution SMC drop weight testing with the test reject and any unused sample being returned to the blended composite Each

  • Voltage Sags Dips and Swells Power Standards Lab

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  • Bond Work Index an overview ScienceDirect Topics

    The Bond work index is not solely a material constant but is influenced by the grinding conditions For example the finer the grind size desired the higher is the kWht required to grind to that size Magdalinovic 38 measured the Bond work index of three ore types using different test screen sizes He produced a correlation between the mass of test screen undersize per revolution G and

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  • SAG Power Index SPI Test Mining SGS

    Conducted in a benchscale comminution mill the SPI test measures the energy needed to perform a standard size reduction and is expressed as an index It is a measure of the hardness of the ore from a SAG or AG milling perspective

  • SPI A Decade Later SGS

    The MinnovEX SAG Power Index SPI test is celebrating its 10th year of industry use as a primary source of ore data for grinding circuit design optimisation or production forecasting While having enjoyed extensive use and commercial success worldwide there are a number of questions that are frequently encountered


    THE SAG POWER INDEX TEST The SAG Power Index SPI Test was developed in 1991 to answer some of these questions It was evident that unless an inexpensive reliable small scale SAG test was developed some of these questions might never be properly answered Four test mills have been built The protoype was a piece of 12” diameter pipe and ran on


    The development of the Minnovex SAG Power Index SPI Test in Canada has created a new and accurate way to measure ore hardness in a SAG environment Coupled with the standard Bond Ball Mill Work Index Test it is now possible to determine from these two relatively inexpensive laboratory tests

  • The SAG grindability index test ScienceDirect

    The relevant equation expressed the mill power draw per unit throughput as a function of the SPI and T 80 as follows Starkey and Dobby 1996 8 SAG kWh t 22 01 SPI T 80 033 where the T 80 is the 80 passing size of the SAG screen undersize

  • SAG Mill Grinding Solutions Ltd

    SAGmill 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 kWht The SPI index provides a profile of the hardness of the ore type and can be used for geometallurgical models

  • Orway Mineral Consultants Canada Ltd Mississauga ON

    SPI 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 17 mm is used to predict AGSAG specific energy

  • The application of the sag power index to ore body

    The SAG Power Index test SPI is a tool for forecasting autogenous mill performance Much effort has been directed towards the development of the process models relating SPI to throughput estimates but little has been directed towards ore body modeling

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