The SAG mill weight measurement combines mill shell mass charge mass and liner mass Powell (2006 2009) via a series of mill charge inspections at various operating mill weights confirmed that strong relationships can be developed between volumetric mill filling and mill weight Figure 9 displays histograms of mill power speed weight Get price

energy predictions for SAG/ball mill circuits (Morrell 2004b) the power draw of the mill was measured using a purpose built power meter to The concentrate weight recovery was in the order of 50–60% Furthermore it may be observed that the Bond ball mill work Get price

SAG mills are a critical component in mineral processing operations at the same time they are a difficult process to control Due to this combination of factors automatic control of SAG mills has received significant attention from mine operators and from advanced control system providers Get price

I'm wondering what type and firmness of you would recommend for a weightlifting bench I'm looking for something about 3-4″ thick and would deflect comfortably but minimally between the shoulders when one is bench pressing a large amount of weight between 300-500 lbs Get price

Mills usually operate in the range 65 - 82% of critical but values as high as 90% are sometimes used A crucial parameter that defines the performance of a 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 millsGet price

The Bond Rod Mill Grindability Test is performed similarly to the ball mill test The feed sample is stage-crushed to " and the test is run under a circulating load As in the ball mill test the test can also be closed with various sieve sizes but for AG/SAG mill Get price

The Cadia SAG mill is 40 ft in diameter and the shell of the mill is 22 ft long between flanges Strain gauges were applied to the Cadia mill at the locations shown in Fig 2 The gauges were placed in similar locations to those on the Telfer mill but the feed end head gauges were omitted due to access restrictions during relining of the mill Get price

utility line design calculations The following calculations are included in the website requires minimal training and take seconds to perform Utility Line Design has over twenty-five planned calculations that will be added to the website at no added charge in the coming months Get price

Weight Test in order to determine the distribution Of particular interest in AG/SAG milling is whether there is a heavy component in the ore which is also resistant to impact breakage and is also liberated at coarse size Such a component has the potential to concentrate in the mill and cause power draw problems The presence ofGet price

Apr 14 2017Weight Span Calculation of Sag in Transmission Line The analytical method for calculating weight span is given below The distance of 'Null point' or 'Low point' of the conductor from a center of the span is given by the formula x = (Th) / (w l) x = distance of a low point from the center of the span T = conductor tension in kg Get price

between the rotating mill and the static parts of the motor This enables a contin-uous workflow without maintenance on the gears or the pinions What used to be downtime is now productive time Vibration-free low-weight short-circuit- proof design with high stiffness Designing highly complex capital goods such as a Gearless Drive means startingGet price

SAG mill fractional total filling (J t) and ball filling (J b) are determined by solving the powerdraw or mill weight residuals given mill power draw or weight process measurements as inputs SAG mill fractional rock charge filling (J r) is calculated by difference of the total and ball charge fractions see Equation (11) J Get price

This result together with equation (4) shows that in autogenous mills specific power (power per unit load volume) is maintained at required levels despite low load density by operating with large torque-arm length due to large mill diameter and low filling Threevalues ofIX Get price

AG/SAG Mill The Autogenous/Semi-autogenous Grinding Mills are in most cases used as primary crushers AG Crushers use the ore exclusively as their grinding media In case the hardness and the abrasiveness of the Ore is not suitable enough to carry out the grinding process steel balls are added in-order to assist the process these are called SAG Crusher Get price

tems for SAG-Mills has become more and more common in the recent years Very high power ratings with excellent dynamic performance and high efficiency over a wide speed range allow advanced optimi-zation of the process The design of such large mill drive systems requires modern simulation tools to verify the system be-havior Get price

1 are used in AG/SAG mill modelling for predicting how rocks break inside the mill From this description the model can predict what the throughput power draw and product size distribution will be Figure 4 – Drop-weight Tester The standard JK drop-weight test normally needs at Get price

Bond rod mill work index (Wi RM) SAG Grindability index (SGI) or SAG Power index (SPI™) Drop weight test both JK and SMC (Ab DWI Mia etc) Bond rod mill work index versus Ab Only considering rod mill work index tests performed in laboratory mills equipped with wave liners This is the standard specified by F Bond and is typical of Get price

Mines (WA) 36ft SAG mill the number of Outer Head Liners was reduced from 36 to 18 pieces and in doing so reduced the time to replace them by 9 hours at a cost downtime saving of about U$25 000 per hour In this case the liners sections are 3 5 t each For smaller mills the liners have to be handled and installed manually so smaller blocks withGet price

The absorbed power is calculated by multiplying the torque on the driving shaft with the shaft speed (rad/sec) and hence excludes any losses associated with the gearbox and motor The pulp weight in the mill is obtained by subtracting the mill weight during the test from the empty mill weight including the ball charge at the start of the test Get price

The sag curve of a conductor which is spanned between to points is depending on the distance between the fixed points and the tens ion in the conductor and can be specified by the funicular curve The always presented wire tension is variable by the wire temperature and the additional l oad This permanent stress leads to an irreversibleGet price

Jan 18 2015For the Ender IO stuff first step is to make a Stirling Generator and place it right in the middle between the Alloy Smelter and the SAG Mill Drop any kind of fuel (coal charcoal etc) into the Stirling and if it is touching the other two machines it will transfer power over to them Get price

semiautogenous grinding (SAG) mills and is the last in a five-part series on Inferential Measurement of SAG Mill Parameters Inferential measurements of SAG mill discharge and feed streams and mill rock and ball charge levels detailed earlier in the series are utilised in a simulation environment Get price

between the rotating mill and the static parts of the motor This enables a contin-uous workflow without maintenance on the gears or the pinions What used to be downtime is now productive time Vibration-free low-weight short-circuit- proof design with high stiffness Designing highly complex capital goods such as a Gearless Drive means startingGet price

SAG Mill Grinding Solutions offers the following tests for SAG mill testing and/or sizing JKTech Drop Weight The JKTech Drop-Weight Test measures the breakage characteristics of an ore for five size fractions in the range of 13 to 63 mm at various energy inputs (0 1 to 2 5 kWh/t) Get price

Every mining operation has a unique grinding process 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 Get price

Mills usually operate in the range 65 - 82% of critical but values as high as 90% are sometimes used A crucial parameter that defines the performance of a 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 millsGet price

Bare wire weight x weight span for the cold case (Eq 2) Weight of unit length of iced wire x weight span for the ice case (Eq 3) In Equations 1 to 3 and for the situation in Fig 1 the unit weight of the iced wire is always larger than that of the bare wire but the weight span under ice Get price

After closed-circuit secondary crushing the SAG mill feed 80% passing (F80) size was 25 mm to 30 mm Installed grinding power is split equally between the two mills with the SAG mill fitted with a variable speed drive (VSD) SAG discharge screen oversize ('pebbles' or 'scats') was Get price

Methods to Estimate AG/SAG Mill Power Requirements It is one of my main complaints about some of the common tests (yes John your test too) "We" are throwing away valuable information in the preparation of 20-30 mm samples by assuming it behaves the Get price

More stable plant operation was obtained in the SAG operating mode as quantified by a reduction of 16% and 15% in the standard deviations of mill power draw and product size respectively The target product size (P 80 ) of 450 μm was obtained when the exhaust fan power draw was 1650–1700 kW which in turn dictated the feed rate of 580 t/h Get price

•Electric power (kW) •Mill weight (kg) • Throughput (kg/h) The absorbed power is calculated by multiplying the torque on the driving shaft with the shaft speed (rad/sec) and hence excludes any losses associated with the gearbox and motor The pulp weight in the mill is obtained by subtracting theGet price

supported grinding mills up to the largest sizes SAG/ball mill circuit incorporating pebble crushers and a POLYCOM high-pressure grinding roll SAG and ball mill for gold ore grinding One of three SAG mills with 9 75 m diameter and 2 x 4000 kW drive power These mills operate in conjunction with ball mills for iron ore grinding in Iran Get price

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