Pudong new district, Shanghai, China.
AG/SAG mill based circuits and this has impacted on the ability of companies to obtain funding. Bailey et al. (2009) published guidelines on the use of typical SAG mill-based circuit design methods, with particular focus on the use (and misuse) of JKSimMet. A follow up paper by Lane et al. in
9 Rolling mill drive 9 Off-shore wind power IGCT Assemblies Up to 14MVA. High surge current: single unit>35kA@10ms ... simulation, magnet control, UPS and sag protection. For many pulse power applications, semiconductor ... the latest i² thyristor technology for …
The 38' SAG Mill at Freeport Indonesia has already proven discharge capacity at new feed rates of over 6,000 mtph. The largest mill line offered to date (2004) includes a 33,000 HP (24.6MW) SAG Mill and two 25,000 HP (18.6MW) Ball Mills for a total installed power of 83,000 HP/61.8MW. This list speaks for itself.
The oil-fi lled rheostats posed a fi re hazard, and parts and service for the old thyristor controls were hard to obtain. The ... This variable speed drive application is a dual-pinion SAG mill driven by two 5,000 kW wound rotor induction motors. Two TMdrive-10SPRs control motor speed by recovering rotor current
SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill. The best way to measure load is to mount the mill on load cells. ... the system will release the thyristor pulses and will power the mill slowly up to the previous speed when ...
Thyristors Wire wrap technology Rated values of SAG Mill and Ball Mill. Description Ball-Mill Sag-Mill Power 4155 ... Accionamiento LCI y motor 6500 Hp motor de SAG mill Simulacin SCR Voltage (Motor side Converter) SCR 1 ...
1. SAG mill is the primary tool for grinding. SAG mill is used before the other mills. Ball mill is a secondary, and it is used after the SAG mill. 2. SAG mill breaks the raw material into pieces for the further grinding. Ball mill is used to grind the pieces of raw material into. powder-like structures. 3.
The purchase of a complete new SAG Mill Package sizes the mill at 2,300tpd or 0.8Mtpa with the existing motor. The installation of a larger 4,100 kW motor could allow a daily throughput rate to ...
The thyristors are usually only active during start, when they short out the diodes to provide a path for the starting current. Anyhow, I stand by my recommendation from 3 Nov 14 06:37: Inspect and measure everything in exciter and rotor. Including low-ohm check of windings. ... When the Sag Mill was in operation the clutch operation just did ...
SAG mill. 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 …
Two mills typically used are Ball Mills and SAG Mills which form part of the early stages of the recovery of various metals such as gold, platinum, uranium, copper and other ... control of Thyristor devices (Integrated Gate Commutated Thyristors (IGCTs) and Symmetrical Gate …
AG and SAG mills can be used as a one-stage grinder but are often used as the first stage in a two- or multiple-stage grinding process, where the second stage is carried out by the ball mill. ... An SVC consists of a combination of thyristor-switched capacitors (TSCs) and thyristor-switched reactors (TSRs) or thyristor-controlled reactors (TCRs ...
Cycloconverter (static Scherbius system) A cycloconverter is a converter that converts AC voltage of one frequency to another frequency without an intermediate DC link. When a cycloconverter is connected to the rotor circuit, sub- and supersynchronous operation variable-speed operation is possible. In supersynchronous operation, this ...
KEYWORDS: Thyristor converter, cycloconverter, harmonic distortion, synchronous motor drives. 1. INTRODUCTION ... (for SAG mills) and 1.5 times rated current for ball mills [4]. During the starting procedure, especially in the first 30 seconds,
A detailed test work was carried out with an industrial semi-autogenous (SAG) mill in a copper plant in close and open circuits to specify the effects of ore characteristics and operational ...
a. the voltage sag along the uncompensated transmission line is the weakest at the midpoint. ... Mine hoists, excavators, steel rolling mills, large thyristor-fed dc drives have limits permitted in voltage fluctuation at distribution voltages is _____ and at transmission voltages is _____. a. 1 …
SAG Mill Design and Specification . The Kidston plant was designed to process 7500 tpd fresh ore of average hardness; but to optimise profit during the first two years of operation when softer oxide ore will be treated, the process equipment was sized to handle a throughput of up to 14 000 tpd. Some of the equipment, therefore, will become ...
Blank spreadsheet that is pre-populated with the field names needed to import laboratory test results into the SAGMILLING.COM circuit model testwork database (subscription required). Enter your test results, one per row, arranged into the columns indicated. To import into your testwork database, copy the block of cells starting with the top row ...
The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. …
Thyristor valves used in the actiVAR TM provide "fast vars" for voltage sag and flicker mitigation while standard capacitor switches provide "slow vars" for harmonic distortion attenuation and power factor correction. The actiVAR TM samples your phase voltage, load, and line currents at rates exceeding 7,000 times a second, analyzing them in real-time, and instantaneously responds to ...
Material handling system, Jaw & Cone crushers and SAG ball mill, Leaching reactors, Filter presses, spin flash dryer, Slurry &… Mechanical (This is Indian based industries. DCS, PLC based mineral ore processing plant having capacity 3500 TPA Cobalt Carbonate and 16000 TPA Copper Cathode and Sulphuric Acid Plant - 45000 TPA)
The modernization project includes two 8 MW SAG (semi-autogenous) mills and two 9.7 MW ball mills with dual pinion drives. The new drive systems are replacing the existing synchronous motors and direct converters for the SAG mills and the drive systems of the ball mills, which were installed by a different manufacturer.
32 x 12 ft (9.8 x 3.6 m) Hardinge Koppers ( ) SAG Mill 6800 HP. 32 x 12 ft (9.8 x 3.7 m) Hardinge Koppers SAG Mill 6800 HP (5100 kW) Two GE wound rotor induction motors: - 3400 HP - 710 RPM - 4000 V - Includes motor starter. - Includes lube system and temperature sensors.
At 8 – 12 % v/v ball charge volume, and 25 – 35% v/v total charge volume the SAG mill typically draws 10 –. 11 MW. The operating work index for the mill is extremely ore. depe ndent and can ...
See who else is going to Summit 40' - Exclusive for 40' SAG mill, and keep up-to-date with conversations about the event. Summit 40' de ME Elecmetal, cumbre anual de molinos SAG, conecta a un ...
Figure 1 Ball mill shells delivered and brought into the mill building. Figure 2 Ball mill cradle being installed. Figure 3 Ball mill shell being lowered into the cradle. Figure 4 SAG mill shell ...
CITIC HIC has received an order for SAG Mill Ø7.9m x 5.3m LG – 5,500kW SAG Mill Ø7.0m x 4.1m LG – 2,800kW Ball Mill Ø7.32m x 10.68m... 02 April 2010 SINO Iron Mill Arrive at Site
the latest i² thyristor technology for optimum efficiency and can be used in both single phase and three phase applications. These are primarily designed for operation at 35kV, with the range extending up to 300MVar. We have a growing number of reference projects currently in operation for the entire range. The Dynex range of TCRs have been ...
Inventory ID: 6C-GC02. MPSI HARDINGE 21' x 11' (6.4m x 3.35m) EGL Sag Mill with 2875 HP, 240 RPM Motor
Ball and SAG mills are one of the most expensive pieces of equipment designed without redundancy, thus they can quickly ... usually half-suppressed thyristor converters used for years with DC drives. The basic unit is generally a three-phase bridge with which a ... As the loaded mill starts up, the control system evaluates
Control of -SemiAutogenous Grinding(SAG) mill weight is an example of an important process that exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009).
A view of the SAG Mill and Ball Mill at Agnico Eagle's Meadowbank mine in Nunavut, in this June 28, 2011 file photograph. At the rim of the Arctic Circle in Canada, gold mining firm Agnico-Eagle is learning how tough it is to operate in a remote region with temptingly large, but frustratingly inaccessible, reserves of oil, gas and minerals.
The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
Products/Services for Sag Mill Liner Bolts. Bolts - (1225 companies) A bolt is a type of threaded hardware fastener that is used to position two workpieces in specific relation to each other. Bolts come in several configurations for their application and specification variances. Since the terms " …
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