sag mill pebble crusher sag mill pinion damage

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  • Sag Mill Pinion Failure Crusher, quarry, mining and

    Damage to mill cylinder, neck or stub endanger girth gear and pinion. Repairs entail . or not at all. Moreover the elastic mill sag in hot or cold condition can vary, depend- . lubrication break-down, faulty switching, failure to adapt the adjust-. Read more

  • SAGDesign Test Starkey and Associates Inc.

    The SAG mill pinion energy, W SDT (kWh/t) and SAG discharge Bond ball mill work index, S d-BWI (kWh/t), are then used to calculate the total energy to grind the ore from 80% passing 152 mm to 80% passing the client specified final product size P 80.This information, along with the ore specific gravity, is used to calculate necessary mill sizes and motor power in industrial applications.

  • USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT

    For tumbling mills the 2 indices relate to “coarse” and “fine” ore properties plus an efficiency factor which represents the influence of a pebble crusher in AG/SAG mill circuits. “Coarse” in this case is defined as spanning the size range from a P80 of 750

  • Power-based modelling of single-stage AG and SAG mill circuits

    P80 is the SAG hydrocyclone overflow 80% passing size, µm F80 is the milling circuit feed 80% passing size, µm, fSAG is a calibration parameter for pebble crushing and/or fine feed (typically 1.0 for 80% passing six inch mill feed and when no pebble crusher is present). WiBM is the Bond ball mill

  • Optimizing Performance of SABC Comminution Circuit of the

    the SAG mill and ball mill was 8658 kW, which caused partial over-grinding. From experience in processing plants outside of China, the power rating of the ball mill should be higher than that of the SAG mill [5]. The pebble crusher had an over-powered configuration. The installed power draw of 630 kW

  • Sag Mill Pinion Failure Crusher, quarry, mining and

    Damage to mill cylinder, neck or stub endanger girth gear and pinion. Repairs entail . or not at all. Moreover the elastic mill sag in hot or cold condition can vary, depend- . lubrication break-down, faulty switching, failure to adapt the adjust-. Read more

  • Power-based modelling of single-stage AG and SAG mill

    P80 is the SAG hydrocyclone overflow 80% passing size, µm F80 is the milling circuit feed 80% passing size, µm, fSAG is a calibration parameter for pebble crushing and/or fine feed (typically 1.0 for 80% passing six inch mill feed and when no pebble crusher is present). WiBM is the Bond ball mill

  • USING THE SMC TEST® TO PREDICT COMMINUTION

    For tumbling mills the 2 indices relate to “coarse” and “fine” ore properties plus an efficiency factor which represents the influence of a pebble crusher in AG/SAG mill circuits. “Coarse” in this case is defined as spanning the size range from a P80 of 750

  • Uneven SAG Mill Drive Power Draw Grinding

    Differences between drives power draw of two drives sag mills. In a double drive/pinion SAG, we face different power draw between each drives. recirculation (through pebble crusher) load? Answers to the above questions can probably give clues to the cause of the problem. there is a simple harmonic motion set up in the drive train which

  • Taking Control of the Mill Feed R2

    to the SAG mill feed conveyor. A 736 Allis Chalmers pebble crusher (110 kW) performed this duty. A Process Flow Diagram is presented in Figure 2. The 8.53 m Ø x 3.92 m EGL (28 x 12.8-ft) SAG mill is fitted with two 1850 kW motors. An operating ball charge in the range of 4 to 10% is used. The mill currently operates at a fixed speed

  • Optimizing Performance of SABC Comminution Circuit of

    the SAG mill and ball mill was 8658 kW, which caused partial over-grinding. From experience in processing plants outside of China, the power rating of the ball mill should be higher than that of the SAG mill [5]. The pebble crusher had an over-powered configuration. The installed power draw of 630 kW

  • Grinding Mills an overview ScienceDirect Topics

    The crushed pebbles fall directly onto the SAG mill feed belt and return to the SAG mill. SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed.

  • SAG mill Archives International Mining

    The SAG mill trommel screen oversize feeds a pebble crushing circuit which returns crushed product to the SAG mill feed conveyor, the company said. The milling circuit, meanwhile, is fed with (F100) 250 mm primary crushed material from the primary stockpile at a throughput rate of 300 t/h and produces a product size of 70% passing 75 μm, which

  • Paper # 25 Copper Mountain Overview on the Grinding

    SAG mill, ball mill, ring gear, dual pinion, drive systems, variable speed the installation of a new primary crusher and conveyer system. Initial production on the Copper Mountain a short circuit on the motor terminals that could cause severe damage to the gear, pinions, bearings and mill.

  • THE COMMINUTION CIRCUIT DESIGN FOR THE

    The twin 16 MW SAG mills and twin 16 MW ball mills with the installation of the pebble crusher deferred to Year 6 resulted in: • SAG mill throughputs maintained at 3170 t/h for the initial 6 years without pebble crushing • The ball mills were potentially slightly overloaded after Year 6 producing a P80 of between 120 and

  • (PDF) Maximising SAG mill throughput at Porgera gold mine

    Mill consistent with survey #2 exhibiting a finer SAG mill product (smaller throughput with a pebble crusher running would have been between 631 transfer size) to the ball milling circuit than survey #1 (See Figure 6). and 935 dmtph for the feed size distribution achieved by this blast design.

  • 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

  • INCREASING SAG MILL CAPACITY AT THE COPPER

    20’ EGL SAG mill, a Raptor 900 pebble crusher and two 24’ x 39’6” ball mills. Each mill is equipped with a 2 x 8500HP dual pinion drive system. The plant was designed to process 1585 h mtpof SAG feed. From startup, the mill struggled to meet the required production rates. Over time, a

  • Canadian Mineral Processors Examine the Fine Art of

    Apr 01, 2001· There are two grinding lines, each having a SAG mill, pebble crusher and ball mill. The decision to add another ball mill to one circuit was made in part using a comminution economic evaluation tool (CEET), which was introduced at the 1999 CMP meeting. To bring the ball mill speed up to 75% of critical from 66%, the 24-tooth pinion was

  • Sag Mill Pinion Failure Crusher, quarry, mining and

    Damage to mill cylinder, neck or stub endanger girth gear and pinion. Repairs entail . or not at all. Moreover the elastic mill sag in hot or cold condition can vary, depend- . lubrication break-down, faulty switching, failure to adapt the adjust-. Read more

  • Taking Control of the Mill Feed R2

    to the SAG mill feed conveyor. A 736 Allis Chalmers pebble crusher (110 kW) performed this duty. A Process Flow Diagram is presented in Figure 2. The 8.53 m Ø x 3.92 m EGL (28 x 12.8-ft) SAG mill is fitted with two 1850 kW motors. An operating ball charge in the range of 4 to 10% is used. The mill currently operates at a fixed speed

  • Optimizing Performance of SABC Comminution Circuit of

    Dec 02, 2016· the SAG mill and ball mill was 8658 kW, which caused partial over-grinding. From experience in processing plants outside of China, the power rating of the ball mill should be higher than that of the SAG mill [5]. The pebble crusher had an over

  • INVESTIGATION OF SORTING TECHNOLOGY TO REMOVE

    In addition to the mill volume reduction, the critical size material is harder than the normal material and this contributes to additional power draw. In order to overcome the effects of pebbles in the circuit, it is common to install pebble crushers in an AG/SAG circuit. This has increased the AG/SAG mills capacity in some cases by up to 25%

  • Grinding Mills an overview ScienceDirect Topics

    The crushed pebbles fall directly onto the SAG mill feed belt and return to the SAG mill. SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed.

  • Gold plant pebble crushing Henan Deya Machinery Co., Ltd.

    Dec 17, 2020· Sending the pebble-crusher product back to the SAG circuit allows for attaining a finer SAG circuit product, and can relieve the ball-mill circuit. Sending the pebble-crusher product directly to the ball-mill circuit can reduce SAG discharge screening requirements, but if pebble-crusher product size is not well controlled, ball-mill scatting

  • SAG 2001 COMMINUTION APERS Ausenco

    SAG mill base power was estimated from pilot plant data at 7.8 kWh/t, the basis was a SABC circuit of 8% ball charge. Maximum SAG mill power was determined by deducting the installed ball mill pinion power of 7.95 kWh/t from the maximum overall circuit power of 16.7 kWh/t to give 8.75 kWh/t.

  • (PDF) Design of the biggest mill in the world

    The SAG mill has 2 pebble crushers installed in closed circuit. Table 2a and 2b outline the dimensions and operating conditions that were used for the final comminution circuit simulations.

  • What’s the Difference Between Ball Mill, Rod Mill and SAG

    Mar 20, 2020· different grinding media of ball mills, rod mills and SAG mills. Crushing ratio Comparison. The biggest feature of SAG mills is the large crushing ratio, which can crush and grind the materials to 0.074mm at one time, accounting for more than 20% to 40% of the total product.

  • SAGMILLING.COM .:. Mill Critical Speed Determination

    Mill Critical Speed Determination. The "Critical Speed" for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shell's inside surface. This is the rotational speed where balls will not fall away from the mill's shell.

  • Orway Mineral Consultants Canada Ltd. Mississauga, ON

    submitted to the Bond ball mill work index test. The number of SAG mill revolutions required to grind the material to a P 80 of 1.7 mm is used to predict AG/SAG specific energy using quation 4. Correction E factors for feed size and pebble ing are applied to the AG/SAG specific energy, as well as specific crush

  • 2 0 0 6 Welcome to Manta Controls Manta Controls

    pebble crusher, a 10.97m (36’) SAG mill and a 7.3m (24’) ball mill in . Page 5 Figure 3. Schematic of the Newcrest Mining Telfer Operation grinding damage of the mill grate and lifters due to a drop in mill weight when associated to a partial loss of feed to the SAG mill.

  • Magnetic Separation Techniques to Improve Grinding

    • Pebble Crusher • SAG Mill Vibrating Screen Oversize • Ball Mill Discharge Technique/Equipment Solution − Suspended Electromagnet − Suspended Magnetic Drum − Trunnion Magnet Pebble Crusher Figures 3 and 4 shows the location of a suspended electromagnet over a pebble crusher conveyor. Fig. 1. Cone Crusher Mantle damaged by

  • (PDF) Maximising SAG mill throughput at Porgera gold mine

    Mill consistent with survey #2 exhibiting a finer SAG mill product (smaller throughput with a pebble crusher running would have been between 631 transfer size) to the ball milling circuit than survey #1 (See Figure 6). and 935 dmtph for the feed size distribution achieved by this blast design.