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  • SAG Mill Grinding Circuit Design

    Semi Autogenous Design FactorsSag Mill Operation ExampleProcess Plant DescriptionSag Mill Design and SpecificationOperating Problems Since CommissioningDesign Changes and Future Operating StrategiesThe design of large mills has become increasingly more complicated as the size has increased and there is little doubt that without sophisticated design procedures such as the use of the Finite Element method the required factors of safety would make large mills prohibitively expensive.In the past the design of small mills, up to +/- 2,5 metres diameter, was carried out using empirical formulae with relatively large factors of safety. As the diameter and length of mills increased several crit...
  • Unlock SAG mill capacity with process control optimization

    SAG mill optimization work can be carried out remotely, with the implementation of remote connectivity, open collaboration with on-site personnel, and access to real-time plant data - this allows for lower cost implementations, faster execution rates, and increased throughput from the SAG mill.

  • AG - Autogenous SAG Semi-Autogenous Mill Design Calculations

    Table of ContentsSAG Mill ChargeSAG Mill Horsepower — Drive PowerOre Testing for AG SAG Grinding Mill Design Mill Sizing: After laboratory and pilot plant testing confirm the feasibility of autogenous or semi-autogenous grinding, it can be used to establish the exact grinding circuit and mill size. In the pilot plant tests, the tare power of the pilot plant mills should be determined ...

  • SAG MILL GRINDING DESIGN VERSUS GEOMETALLURGY –

    purchase of enough SAG mill capacity to not only achieve design tonnage all the time but also to reduce steel costs in SAG grinding. With this in mind this paper will examine new information that ... Table 1 summarizes the database including all SAGDesign test work results recorded up to and including 2009 and includes the data for ore SG, SAG ...

  • What's the Difference Between SAG Mill and Ball Mill ...

    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 finer grind than SAG mills. How does a sag mill work?

  • AG mills - Metso

    Gearless mill drive (GMD) technology has further expanded the use of large AG milling allowing Metso to produce the world's largest SAG mill of 42’ in diameter drawing power at 28 MW. Today, Metso is the world leading supplier of gearless AG mills operating globally.

  • What's the Difference Between SAG Mill and Ball Mill ...

    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 finer grind than SAG mills. How does a sag mill work?

  • SAG MILL GRINDING DESIGN VERSUS GEOMETALLURGY –

    purchase of enough SAG mill capacity to not only achieve design tonnage all the time but also to reduce steel costs in SAG grinding. With this in mind this paper will examine new information that ... Table 1 summarizes the database including all SAGDesign test work results recorded up to and including 2009 and includes the data for ore SG, SAG ...

  • AG mills - Metso

    Gearless mill drive (GMD) technology has further expanded the use of large AG milling allowing Metso to produce the world's largest SAG mill of 42’ in diameter drawing power at 28 MW. Today, Metso is the world leading supplier of gearless AG mills operating globally.

  • Selection of Comminution Circuits for Improved Efficiency

    Table 3 illustrates how circuit selection may be affected by plant capacity and ore competency. Table 3 . MATRIX OF COMPETENCY AND CAPACITY – EXAMPLES ONLY. Competency . Grinding Circuit Throughput < 0.5 Mt/a . 0.5 to 2 Mt/a . 2 to 6 Mt/a ... a SAG mill based circuit (P80 of 106 to 150 um) has media costs of around A$1/t. Providing the ore is ...

  • (PDF) OPTIMIZATION OF THE SAG MILL CIRCUIT AT KINROSS ...

    through SAG mill practic es and finally bal l mills and c yclones strategies and res ulted in significant improvement in overal l comminution performance of the Kinross Paracatu operation.

  • Increase throughput and capacity in SAG mills

    SAG mills are the main workhorses in the majority of comminution circuits globally. They need to be fed and kept working round the clock. But challenges can arise when capacity is not optimised causing unnecessary downtime and liner wear leading to the one sound operators do not want to hear - the sound of the mills standing still.

  • Mill power draw models - SAGMILLING.COM

    Mill Power Draw Models. The mill power draw models are used to predict how much power will be consumed by a particular type of mill, mill geometry and set of mill operating conditions. This power is transferred to the ore and used to predict the throughput when combined with the specific energy consumption models.

  • AN OVERVIEW OF SINGLE STAGE AUTOGENOUS AND

    5 Low ball charge SAG mill, high mill speed. (4% ball charge, 90% Nc) A cross between AG and SAG for competent, abrasive ores. As typically operated in RSA. 6 SAG mill (configurations 3, and 5 ) with recycle crusher Competent ores, better suited to coarse grind sizes as circulating loads can be high 7 SAG mills treating partially or fully

  • (PDF) Reducing Grinding Energy and Cost -Magnetite Iron ...

    Energy savings ranging from 10 to 50 per cent compared to grinding by conventional ball and rod milling or semiautogenous grinding (SAG) with ball milling have been achieved (Daniel et al 2010 ...

  • Paper # 25 - Copper Mountain Overview on the Grinding ...

    Table 1 includes the technical data for the Copper Mountain SAG mill. Table 1 - general SAG mill data Specification Data Mill size 10.363 M [34 feet] diameter by 6.096 M [20 feet] long Mill type Wet grinding, grate discharge Mill drive motor size 17,000 HP Mill drive motor type Synchronous 200 RPM Inside diameter 10,363 mm Length 6,096 mm

  • Grinding Circuit - an overview ScienceDirect Topics

    The SAG mill is fitted with a 20 MW gearless drive motor with bi-directional rotational capacity. (Reversing direction evens out wear on liners with symmetrical profile and prolongs operating time.) The SAG mill was designed to treat 2,065 t h −1 of ore at a ball charge of 8% volume, total filling of 25% volume, and an operating mill speed of ...

  • SINGLE STAGE SAG/AG MILLING DESIGN

    Therefore, if the oreis not overly grind sensitive and the application and capacity is suited to a single mill scenario, the selection appears appropriate and further investigation is warranted. If grind sensitivity is an issue or the capacity is too high for a single SAG mill, a two stage grinding or alternate circuit is generally recommended.

  • SAG Mill - goldcilplant

    The capacity of the SAG mill is related to lots of factors such as feed size, size distribution, discharge size and grindability, etc., and it should be confirmed according to the actual situation. SM40*14’——means it is a dry mill.

  • AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator ...

    Single Stage SAG Mill. Using SAG instead of AG increases the capacity as well as application range, but will also increase wear costs and still be dependent on “natural” product size being close to the desired. Common circuit in the US and Canada . Single stage SAG mill circuit [image: (135-6-25)]

  • SAG Mill - goldcilplant

    The capacity of the SAG mill is related to lots of factors such as feed size, size distribution, discharge size and grindability, etc., and it should be confirmed according to the actual situation. SM40*14’——means it is a dry mill.

  • Increase throughput and capacity in SAG mills

    SAG mills are the main workhorses in the majority of comminution circuits globally. They need to be fed and kept working round the clock. But challenges can arise when capacity is not optimised causing unnecessary downtime and liner wear leading to the one sound operators do not want to hear - the sound of the mills standing still.

  • Grinding Circuit - an overview ScienceDirect Topics

    The SAG mill is fitted with a 20 MW gearless drive motor with bi-directional rotational capacity. (Reversing direction evens out wear on liners with symmetrical profile and prolongs operating time.) The SAG mill was designed to treat 2,065 t h −1 of ore at a ball charge of 8% volume, total filling of 25% volume, and an operating mill speed of ...

  • sag mill weight - Mine Equipments

    metal lining, sag mill liner, sag mill lining, ag mill liner, - Tega For the tough grinding applications in large diameter SAG and FAG mills there is an ... 2Weight of the lining system is less than that of the complete steel liners.

  • Hill grinding circuit liner design has been the subject of ...

    Page 1 DEVELOPMENT OF A SAG MILL SHELL LINER DESIGN AT CADIA USING DEM MODELLING By S. Hart1, L. Nordell2 and C. Faulkner3 1Metallurgical Superintendent, Cadia Valley Operations, Orange, NSW, Australia; 2President Conveyor Dynamics Inc, Bellingham, WA USA, 3Product Support Manager, Bradken, Runcorn, Qld, Australia. ABSTRACT In August 2001, Newcrest Mining contracted

  • Modelling SAG milling power and specific energy ...

    In Fig. 3, Fig. 4 the data is presented in order to show the effect of the fresh feed size, particularly the % −6″ +1″ (−152 +25 mm), on the SAG mill power consumption (Pc) in kW and on the SAG mill specific energy consumption (Ecs) in kW h/t, obtained by dividing

  • SINGLE STAGE SAG/AG MILLING DESIGN

    Therefore, if the oreis not overly grind sensitive and the application and capacity is suited to a single mill scenario, the selection appears appropriate and further investigation is warranted. If grind sensitivity is an issue or the capacity is too high for a single SAG mill, a two stage grinding or alternate circuit is generally recommended.

  • TECHNICAL NOTES 8 GRINDING R. P. King

    LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the ...

  • Paper # 25 - Copper Mountain Overview on the Grinding ...

    Table 1 includes the technical data for the Copper Mountain SAG mill. Table 1 - general SAG mill data Specification Data Mill size 10.363 M [34 feet] diameter by 6.096 M [20 feet] long Mill type Wet grinding, grate discharge Mill drive motor size 17,000 HP Mill drive motor type Synchronous 200 RPM Inside diameter 10,363 mm Length 6,096 mm

  • Engineering Data for Copper and Aluminum Conductor ...

    TABLE 7 - 10 Sag Messenger Characteristics 47 TABLE 7 - 11 Sag Tables 49 TABLE 7 - 12 Sag Calculating Charts 50 ... TABLE 9 - 5 Capacity of Reusable Reels, Feet 58 TABLE 9 - 6 Dimensions and Capacities of Reusable Reels for Wires and Cables 59-60 List of Tables Okonite Cables. Motor Currents.

  • Mill (grinding) - Wikipedia

    SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. 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.

  • Comparison of Ore Hardness Measurements for Grinding Mill ...

    was surprising that the Bond Rod Mill Wi average was 11.3 kWh/t. Since the ore is unusually soft, the Rod Mill Wi is probably irrelevant in determining required power for the SAG mill. Drop Weight Tests Drop Weight tests were done at Hazen and analyzed by Contract Support Services, Inc. Table 4: Summary of 6 JKTech Drop Weight Tests

  • Freeing up milling capacity in a SAG mill ball mill ...

    The throughput capacity and efficiency of a SAG mill are affected by the significant recirculated load derived from over-size discharge product (critical size “pebble” discharge) that is screened out and may be stockpiled or requires secondary crushing prior to re-introduction to the SAG mill feed.

  • Design Capacity Tables for Structural ... - AusTube Mills

    Design Capacity Tables for Structural Steel Hollow Sections; Download. Australian Tube Mills is one of the world’s premier producers of welded steel tube and pipe for structural, mechanical and low pressure reticulation applications. For many years, Australian Tube Mills has been at the industry forefront with numerous innovations delivering ...

  • Modelling SAG milling power and specific energy ...

    In Fig. 3, Fig. 4 the data is presented in order to show the effect of the fresh feed size, particularly the % −6″ +1″ (−152 +25 mm), on the SAG mill power consumption (Pc) in kW and on the SAG mill specific energy consumption (Ecs) in kW h/t, obtained by dividing

  • Freeing up milling capacity in a SAG mill ball mill ...

    The throughput capacity and efficiency of a SAG mill are affected by the significant recirculated load derived from over-size discharge product (critical size “pebble” discharge) that is screened out and may be stockpiled or requires secondary crushing prior to re-introduction to the SAG mill feed.

  • sag mill weight - Mine Equipments

    metal lining, sag mill liner, sag mill lining, ag mill liner, - Tega For the tough grinding applications in large diameter SAG and FAG mills there is an ... 2Weight of the lining system is less than that of the complete steel liners.

  • A public Database of tumbling mill grindability ...

    The `dwt` (drop weight test) table includes the following fields: • A – The fitted coefficient of a “t10 versus Ecs” curve in a drop weight test. • b – The fitted exponent of a “t10 versus Ecs” curve in a drop weight test. • Axb – The product of the fitted A and b parameters in a drop weight test. • ta – The abrasion resistance measurement of a JK DWT™.

  • Mining Mineral Processing Equipment Manufacturer - JXSC ...

    JXSC Mining Equipment for sale! Complete mineral processing equipment, rock crusher, gold wash plant, magnetic separator, magnetic separators, flotation machine, etc.

  • Comparison of Ore Hardness Measurements for Grinding Mill ...

    was surprising that the Bond Rod Mill Wi average was 11.3 kWh/t. Since the ore is unusually soft, the Rod Mill Wi is probably irrelevant in determining required power for the SAG mill. Drop Weight Tests Drop Weight tests were done at Hazen and analyzed by Contract Support Services, Inc. Table 4: Summary of 6 JKTech Drop Weight Tests

  • Mill (grinding) - Wikipedia

    SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. 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 Method of C alculating Autogenous/ Semi-Autogenous ...

    Rod mills are limited in size to 2000 kW because the longest commercial grinding rod available is 6 m long. For this reason rod mills are rarely selected in the present day environment of large AG/SAG mills and large ball mills. However, it is necessary to discuss their operation because a Rod mill product has a similar slope to AG/SAG mills.

  • Improving Autogenous/Semi-Autogenous Grinding

    efficiency and maximising the capacity of the horizontal grinding mills. As a result of these studies, Outotec has developed a new technology – Turbo Pulp Lifter (TPL™). TPL™ enhances the grinding efficiency of AG/SAG and ball mills and therefore saves significant amount of electrical energy while maximising the mill capacity.

  • Design Capacity Tables for Structural ... - AusTube Mills

    Design Capacity Tables for Structural Steel Hollow Sections; Download. Australian Tube Mills is one of the world’s premier producers of welded steel tube and pipe for structural, mechanical and low pressure reticulation applications. For many years, Australian Tube Mills has been at the industry forefront with numerous innovations delivering ...

  • Selecting Inching Drives for Mill and Kiln Applications

    specified since the expected 25 years life of the mill / kiln, the inching system would operate infrequently. Tables 1 and 2 summarize the expected number of starts and the total hours of operation for inching drives for mills. Event Installation Inspection Relining Warming/Cooling Hours 20 4 36 120 Frequency per year 1 52 1 4 Number of years 1 ...

  • dealing with a sagging table when milling long work

    May 24, 2008  I believe much of the reason for sag in mill tables is the peening given to the bottom side of the tee slots by the top of the tee nuts. Especially by people who overtighten everything. Many tables are straightened by peening the bottom side. The curvature is relatively unimportant if you are working on thin work clamped flat to the table.

  • MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL

    Prediction of the mill dimensions zThe ball-mill dimensions (internal mill diameter D and length L), for a given (L/D) ratio, for feed size D f and product size d (mm), for a known Bond work index w i (kWh/short ton) and for desirable capacity T (short ton/h), can be calculated from: D d T D D L f 3.5 )0.106 0.193 0.962 10.38 0.9180 ( ) (1 − × =

  • Outokumpu Technology’s TPLTM for elimination of material ...

    Mar 14, 2007  Similar to the impeller design affecting pump capacity, the pulp lifter design affects the discharge capacity (or mill throughput) of autogenous grinding (AG) and SAG grinding mills. Generally, the discharge from AG/SAG mills consists of one or both of the following components: slurry (water and finer particles) and pebbles (20-100mm).