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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...
  • Ball MillCement Mills Mechanical Design Pdf

    Sag mill mechanical design pdf ball mill wikipediaball mills are used extensively in the mechanical aside from common ball mills there is a second type of ball mill cechanical design of ball millf grinding mill chinaall mill design pdf ore crusher015124 ball mill design pdf the emax is an entirely new type of ball mill.

  • Outotec Grinding Mills - Outotec

    Grinding Mills; Outotec® Grinding Mills. Optimize grinding mill performance, efficiency, and availability to ensure you meet your plant's operational targets. Outotec high-performance grinding mills use advanced simulation tools for the best possible process efficiency, mechanical reliability, and

  • 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

  • Difference Between Sag Mill vs Ball Mill - mech4study

    Oct 12, 2017  SAG mill make use of steel balls included with some large and hard rocks for grinding. These mills utilize the balls in making the large fragments of materials broken into pieces. The ball charge of a SAG mill is about 9% to 20%.This process takes place inside the large rotating drum of SAG mill which is filled with balls partially.

  • 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 ...

  • SAG MILL DISCHARGE SCREENS-TROMMEL vs. VIBRATING

    SAG MILL DISCHARGE SCREENS-TROMMEL vs. VIBRATING Tony Moon, RTZ What I’d like to talk about is probably one of the nastiest bits of mill design for a grinding circuit, and that is the choice of what do you use on a SAG mill discharge? Do you use vibrating screens or trommel screens? What many of you probably don’t realize is that at

  • REVESTIMIENTOS DE MOLINOS 2016-12

    In larger AG/SAG mill applications, composite design components of Vulco® mill liners are also available to increase service life. These composite designs are leveraged to ensure you get the best design for your mill circuit. ... the robust security of mechanical and

  • Manual design of SAG/ball/rod mill foundations ...

    Mar 14, 2007  As an engineer who has experience using FEM for the design and assessment of SAG and ball mill foundations, I know that this approach can be time-consuming, costly and -- in some cases -- not even a hope of being accurate if you don't have appropriate geotechnical and

  • The Selection and Design of Mill Liners

    mills in the older plants that had many mills in parallel. In fact this is generally still the case in the multi-stream plants, where mill liner design and selection is only tackled on a cost consumables basis. However, the gains to be had through good liner design and selection are just as great as on the large SAG mills.

  • The Selection and Design of Mill Liners

    mills in the older plants that had many mills in parallel. In fact this is generally still the case in the multi-stream plants, where mill liner design and selection is only tackled on a cost consumables basis. However, the gains to be had through good liner design and selection are just as great as on the large SAG mills.

  • (PDF) Understanding the effects of liner wear on SAG mill ...

    The SAG mill disch arges ... that process different raw material physical and mechanical properties, show that 50-70% of the total ore disintegration process accounts for 50-70% expenses, while ...

  • Design for sampling—preliminary exploration

    Design for sampling—preliminary exploration Feed sizing Product sizing/rate Circulating load sizing Circulating load rate Mill filling—balls and ore independently SAG mill load sizing (usually an estimate). Flotation circuits Feed rates Feed grades Froth flows Froth grades Percent solids.

  • 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.

  • SAG Milling in Australia -Revised Submission

    Developments in SAG Mill Design and Operation Over the last few years, SAG mill manufacturing technology has advanced rapidly. The bounds of mill size have been pushed from two directions. Firstly, the advent of ring motors has removed the constraint applied by the power that a

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

    There is significant case study published regarding energy savings and cost efficiencies of the comminution process due to HPGR. Energy savings ranging from 10 to

  • Optimization and Control of a Primary SAG Mill Using Real ...

    Each Module at Waterval Concentrator (WvalC) employs a φ7.3 m x 8.2 m EGL SAG mills with 2 x 5200 kW motors in primary milling duty. Two silos containing Merensky and UG2 ore respectively feed the mill that operates at a fixed 75% of the critical speed. The circuit is closed with a 600 µm aperture classification screen with

  • Grinding Circuit Design for Adanac Moly - SGS

    design of a plant for Adanac Moly Corp. to include SAG and Ball milling. The hardness of each sample was measured in terms of SAG power index, SPI (for SAG grinding) and Bond Ball mill work index, BWi (for ball mill grinding). A further measure, the Minnovex crusher index, Ci was also measured for use in the CEET program to determine SAG

  • A Method to Determine the Ball Filling, in Miduk Copper ...

    one SAG mill (9.75 dia.(m)*3.88 length(m)) following two parallel ball mills (5dia.(m)*7lenght(m)). The aim of this research work was to investigate on the ball filling estimation of Miduk semi-autogenous (SAG) Mill via an utilized method. Miduk SAG Mill circuit is shown in Figure 1. Figure 1: Diagram of Miduk Copper Complex

  • Girth Gears - More than Just Metal and Teeth

    such as SAG (semi autogenous grinding) mills and ball mills for use in the mining and cement industries. By current stan-dards, girth gears can be as large as 14 meters (46 feet) in diameter, 1.1 meters (44 inches) face width, and 50 module (.5 DP) tooth size, and weighing upwards of 120 tons. Flange mounted gears rely, in

  • RESPONSE OF PRIMARY GRINDING MILL PERFORMANCE TO

    SAG mill and how the vibration response and hence mill operating conditions vary as a function of time, including during mill equipment failures such as a broken discharge grate. Opportunities for improved mill control based on ... photograph of the latest design, which was constructed for installation on a ROM ball mill, is shown in Figure 2.

  • Ball mill - Wikipedia

    A ball mill, a type of grinder, is a cylindrical device used in grinding (or mixing) materials like ores, chemicals, ceramic raw materials and paints.Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium. Different materials are used as media, including ceramic balls, flint pebbles, and stainless steel balls.

  • DESIGN OF THE KUBAKA GRINDNG CIRCUIT USING SPI AND

    T80 refers to the SAG product size in microns transferred to the ball mill circuit. The design procedure chosen by Davy used the SPI and Bond Ball Mill Work Index values to select the required specific energy for both the SAG mill and the ball mill. The other tests were used for comparison and to confirm the chosen result. Then, since used ...

  • A Practical Guide to Shaft Alignment - Plant Services

    Indicator bracket sag measurement 43 Alignment by Laser 45.. Basic operation requirements 48 ... elements in their design. ... misalignment itself, when mechanical seals fail, bearings have to be . removed from the shaft assembly, sometimes re-fitted or in most cases replaced. Removal and re-fitting in itself can cause bearing damage.

  • Girth Gears - More than Just Metal and Teeth

    such as SAG (semi autogenous grinding) mills and ball mills for use in the mining and cement industries. By current stan-dards, girth gears can be as large as 14 meters (46 feet) in diameter, 1.1 meters (44 inches) face width, and 50 module (.5 DP) tooth size, and weighing upwards of 120 tons. Flange mounted gears rely, in

  • RESPONSE OF PRIMARY GRINDING MILL PERFORMANCE TO

    SAG mill and how the vibration response and hence mill operating conditions vary as a function of time, including during mill equipment failures such as a broken discharge grate. Opportunities for improved mill control based on ... photograph of the latest design, which was constructed for installation on a ROM ball mill, is shown in Figure 2.

  • Ball mill - Wikipedia

    A ball mill, a type of grinder, is a cylindrical device used in grinding (or mixing) materials like ores, chemicals, ceramic raw materials and paints.Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium. Different materials are used as media, including ceramic balls, flint pebbles, and stainless steel balls.

  • DESIGN OF THE KUBAKA GRINDNG CIRCUIT USING SPI AND

    T80 refers to the SAG product size in microns transferred to the ball mill circuit. The design procedure chosen by Davy used the SPI and Bond Ball Mill Work Index values to select the required specific energy for both the SAG mill and the ball mill. The other tests were used for comparison and to confirm the chosen result. Then, since used ...

  • A Practical Guide to Shaft Alignment - Plant Services

    Indicator bracket sag measurement 43 Alignment by Laser 45.. Basic operation requirements 48 ... elements in their design. ... misalignment itself, when mechanical seals fail, bearings have to be . removed from the shaft assembly, sometimes re-fitted or in most cases replaced. Removal and re-fitting in itself can cause bearing damage.

  • The Science of Comminution

    mechanical design elements, Outokumpu considers the owner’s business objectives, at the installation site, experience of the operators and the logistics of delivering the mill unit. Outokumpu Mills has a long experience in supplying mills employing rolling element bearings. Thermal expansion of the mill along the axis of rotation is

  • t10 (%) Weighted Fit 63 x 53 - SMC Testing

    parameters used by the AG/SAG mill model in JKSimMet which permits prediction of the product size distribution and the power draw of the AG/SAG mill for a given feed size distribution and feed rate. In . 0 10 20 30 40 50 60 70 80 90 100 0 0.5 1 1.5 2 2.5 3 3.5 4 t10 (%) Ecs (kWh/t) Weighted Fit 63 x 53 45 x 37.5 31.5 x 26.5 22.4 x 19 16 x 13.2

  • Common Mechanical Engineering Terms

    Common Mechanical Engineering Terms Ball and Detent (n) A simple mechanical arrangement used to hold a moving part in a temporarily fixed position relative to another part. The ball slides within a bored cylinder, against the pressure of a spring, which pushes the ball against the detent, a hole of smaller diameter than the ball.

  • Modelling SAG milling power and specific energy ...

    operating SAG mills (it is not intended for design, but could help with it). Even if the mill total load is a key variable and can be indi-rectly measured with bearing pressure measurements, it was decided to discard it as an input variable. The main reason is that

  • SAG mills (semi-autogenous grinding mills) - Metso

    SAG mills are also an optimum solution for wet grinding since crushing and screening in these cases can be difficult, if not impossible. Efficiency through automatic operation Metso’s process engineers will assist you in creating an efficient software-driven process, from circuit design to start-up and optimization, to ensure you get your ...

  • INCREASING SAG MILL CAPACITY AT THE COPPER

    Copper Mountain first feed to the SAG mill occurred in late May, 2011. The circuit began ramp up in mid-June of that year, with more consistent operating run times on the SAG and Ball mills. Plant throughput in the first months was quite variable with throughput tonnage greater than 40,000 tons one day and less than 25,000 the next on some ...

  • Mineral Processing Plant Design

    crushers to SAG circuits, on both greenfield and retrofit projects, to increase feed rate to the SAG mill. In other words, crushing plants, from primary to quaternary circuits, are here to stay. There are three main steps in designing a good crushing plant: process design, equipment selection, and layout.

  • SAGDesign Case Studies - Leaders in Comminution Design

    Ball Mill Wi test on SAG ground ore from the first or SAG stage of the test. The SAG stage therefore had to use enough material to do the Bond Wi test. To ensure this, the SAGDesign SAG mill was designed to be 488 mm (19.2”) in diameter and 163 mm (6.4”) long (EGL). Other design parameters for the SAGDesign SAG mill were selected to

  • SAG Mill Testing - Test Procedures to Characterize Ore ...

    samples historically constituted the traditional approach for AG or SAG design, but was gradually replaced by small-scale tests. Nowadays, conducting grindability tests requiring only a few kilos of material on several samples, is a more typical approach to grinding mill design. This paper summarises the requirements and

  • A RAPID SAG MILL GRINDABILITY AND MILL SIZING

    SAGDesign test, information regarding the SAG specific grinding energy can be output prior to the completion of the test as a whole. This allowed for the SAG mill diameter (a critical design variable for the clients infrastructure engineering as it determined ceiling height) to be determined with confidence early in the design process.

  • A Practical Guide to Shaft Alignment - Plant Services

    Indicator bracket sag measurement 43 Alignment by Laser 45.. Basic operation requirements 48 ... elements in their design. ... misalignment itself, when mechanical seals fail, bearings have to be . removed from the shaft assembly, sometimes re-fitted or in most cases replaced. Removal and re-fitting in itself can cause bearing damage.

  • A Method of C alculating Autogenous/ Semi-Autogenous ...

    SAG mills mimic the same shortcoming. It follows that in order to obtain the specifi c energy (SE) to achieve a certain transfer size, based on the 80 per cent passing value, an ineffi ciency factor must be applied to the SE of single stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method.

  • How Ball Mills Work (Engineering and Mining) - YouTube

    Jun 20, 2019  For both wet and dry ball mills, the ball mill is charged to approximately 33% with balls (range 30-45%). Pulp (crushed ore and water) fills another 15% of the drum’s volume so that the total ...

  • Modelling SAG milling power and specific energy ...

    operating SAG mills (it is not intended for design, but could help with it). Even if the mill total load is a key variable and can be indi-rectly measured with bearing pressure measurements, it was decided to discard it as an input variable. The main reason is that

  • Autogenous and Semi-Autogenous Mills

    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.

  • Fundamental Principles of Mechanical Design

    Mechanical Design Fundamentals K. Craig 3 Introduction • Precision machines are essential elements of an industrial society. • A precision machineis an integrated system that relies on the attributes of one component to augment the weaknesses of another component. • Here we emphasize the design of mechanical and structural

  • Grinding mills - for mining and minerals processing - Metso

    Every mining operation has a unique grinding process. 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.

  • Pdf ball grinding process - Blue Towers Community

    ball mill grinding and beneficiation process pdf files. ball mill in iron ore beneficiation pdf. Wet ball mill and fine ore crushers are used during this process.ball mill in iron ore beneficiation pdf,ball mill in iron ore beneficiation pdf,HPGR in the Iron Ore Industry - METS EngineeringMineral Processing > Engineering Design > Training > Specialist Services.

  • SAG mills (semi-autogenous grinding mills) - Metso

    SAG mills are also an optimum solution for wet grinding since crushing and screening in these cases can be difficult, if not impossible. Efficiency through automatic operation Metso’s process engineers will assist you in creating an efficient software-driven process, from circuit design to start-up and optimization, to ensure you get your ...

  • Optimization of mill performance by using

    Optimization of mill performance by using online ball and pulp measurements J o u r n a l P a p e r The Journal of The Southern African Institute of Mining and Metallurgy VOLUME 110 NON-REFEREED PAPER MARCH 2010 135 Table I Influence of speed and liner design on load dynamics Mill speed Soft design Aggressive design

  • A mine of efficiency

    12.8m diameter SAG mill. But the most powerful GMD systems currently in op-eration – 22.5MW – are those used in Boliden’s concentrator plant in Sweden; they drive the huge 11.6m autogenous (AG) mills. In terms of volume, the Aitik mills are the largest in the world with their astonishing length of 13.7 m. Ensuring reliable and stable power

  • A comparative

    above the nominal mill throughput. Considering a mill runtime of 94% and a final P80 size of 180 micrometers, the proposed circuit consists of a SAG mill 40 feet in diameter and 25 feet in length (EGL), with an installed gearless motor of 30 MW and two 28 feet diameter by 44.5 feet in length ball mills equipped with 22 MW gearless motors.

  • ATTRITOR GRINDING MILLS AND NEW DEVELOPMENTS

    a unique patented design concept that includes a new grinding tank internal configuration and side discharge screen which allows mills to run at higher speed, using smaller media, and continuously discharges products out of the mill by centrifugal force. (Fig. 6) HSA Attritors generally operate from 400-1800 RPM using grinding beads from 1-3mm.