In order to obtain the optimal operation parameters of a SAG mill, in this paper, the discrete element method (DEM) is used to simulate the breakage process of the particles by controlling...
Sag Mill Trip on Ground Fault - CR4 Discussion Thread What can cause severe ground fault on HV breaker serving SAG MILL via LRS. LRS for SAG MILL trips …
Mill, gear and pinion friction multiplier: 1.025 Mill Power required at pinionshaft = (240 x 16.5 x 1.025) ÷ 0.746 = 5440 Hp Speed reducer efficiency: 98% 5440 Hp ÷ 0.98 = 5550 HP (required minimum …
I have problem in our Sag Mill Motor which tripping on Earth Fault and block tripped on the Multilin protection relay. This Sag Mill is driven by the 4MW / 6.6kV wound rotor, with soft stater called LRS - Liquid Resistance Stater. We don't have problem of starting since it was commision six month ago, just last week it was start tripping on ...
Another common issue with SAG mills is operating at very low density (e.g. <70% solids) - if there is room to increase SAG density, this will enable the SAG to grind finer with little or no decrease in throughput. Consider reducing the feed rate when the overload starts rather than waiting until a grind-out becomes necessary.
Offset fences and creeks, sag ponds (depressions along the fault which often become filled with water in winter), escarpments, and damaged trees are lasting evidence of the quake. The San Andreas Fault traverses the length of the Fort Ross orchard in an approximate north-south direction. The orchard is situated east of Highway One 1/4 mile up ...
Discharging Method Comparison. SAG mill: The SAG mill adopts a self-return device to realize the discharge of the mill. Ball mill: There are many types of ball mills, mainly including overflow ball mills …
SAG mill: When the weight of the SAG mill is more than 75%, the output is high and the energy consumption is low with a light degree of over-crushing. Taking quartz as an example, the following …
The delays in SAG mill circuit depend on the general arrangement of the circuit (e.g. distance between feeders, belt scales and the mill), PID controller settings and speed of belt conveyors. ... other applications include process fault detection, identification of broken sensors and backup of the hardware counterpart. Data-driven soft sensors ...
Principle of SAG Mill operation. 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%.[6][7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP ...
Online Vibration Monitoring System Improves Fault Detection in a SAG Mill. A copper mine site already had an extensive …
Simulation results under the ∅5250 × 500 mm mill model show that the mill operates with the optimal effect when the mill is under the condition of 80% critical speed and 15% fill level; the ...
When SAG mill liner bolts loosen, break or stretch beyond limits, liner impairment and degraded performance are generally next on the agenda, followed by mill stoppage for repair or replacement. Bolts and nuts — …
drive application is a dual-pinion SAG mill driven by two 5,000 kW wound rotor induction motors (WRIM). Two TMdrive-10SPRs control motor speed by recovering rotor current and returning the power to the utility supply. Configured in a twin motor arrangement, the motors share load in the tandem mill. The Customer Need
Even though Semi Autogenous Grinding (SAG) and Autogenous Grinding (AG) mill charges contains less balls and no steel …
SAG mills tend to break most rock via attrition. Sharp edges are easier to break than rounded geometries. Crusher fractures rock, often on a major axis while SAG mill "mill" it bit-by-bit from its edges. Round rock takes many passes to render it to a smaller size by small attrition and abrasion.
Newcrest's Cadia mine's SAG mill has been shut down following motor issues. On Saturday a problem was detected with the motor on concentrator 1 SAG mill, Newcrest said in a company statement. The issue is as yet unknown, the miner said, and as such the mill has been shut down while engineers work to determine the repairs required.
of the energy required by a SAG mill. Put another way, the SAG mill energy required according to this statement, is 2.5 times more than the Ab value to produce the same degree of particle breakage. There is a speci fi c gravity factor that affects AG/SAG power draw. The lighter material, in the 2.5 specifi c gravity (SG)
This paper investigates the application of statistical fault detection methods, in conjunction with process topology data-driven techniques for root cause analysis, to a simulated milling circuit. Two faults (faulty particle size analyser and rapid mill liner wear) were simulated, and the statistical monitoring techniques tested.
The Manta Controls Advanced Control System, called the SAG Cube, automatically monitors and controls a SAG Mill, keeping track of critical process variables impacting mill throughput. For most sites, one hour of operation provides a revenue between AUD$ 20,000 per hour up to or greater than AUD$ 100,000 per hour. Therefore, any downtime is very ...
However, when there was only one primary grinding mill- a large SAG mill- the process became too inefficient and costly (in the terms of increased downtime) for the mill to be relined by an in-house team. …
The plus ore will be handled separately and the two will be stored in separate stockpiles. The feed to their SAG mills will be a mix of the two, the plus as media rock and the minus as rock to be ground. The ultimate product from their SAG mill will be about 6 Mesh (3.3 mm). Further grinding will be by ball mill after magnetic separation at ...
Mill, gear and pinion friction multiplier: 1.025 Mill Power required at pinionshaft = (240 x 16.5 x 1.025) ÷ 0.746 = 5440 Hp Speed reducer efficiency: 98% 5440 Hp ÷ 0.98 = 5550 HP (required minimum motor output power). Therefore select a mill to draw at least 5440 Hp at the pinionshaft.
This example is from the San Andreas fault in the Carrizo Plain National Monument in California. Sag basins can be quite large; the San Francisco Bay is an example. Where the ground surface of the sag basin falls below the water table, a sag pond appears. Examples of sag ponds can be found along the San Andreas fault and the …
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%.[6][7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.[8]
This example is from the San Andreas fault in the Carrizo Plain National Monument in California. Sag basins can be quite large; the San Francisco Bay is an example. Where the ground surface of the sag …
Your operation requires a Semi Autogenous Mill (SAG mill) or Autogenous Mill (AG Mill) that is flexible, durable, cost-efficient and tailored to your specific needs and use cases. That's why we offer a full product range …
In all three cases (Ball, SAG or AG mill), when the equipment is stopped, the material inside can dry up over time to form a solidified charge. When the mill is restarted, the solidified charge needs to break …
A SAG mill has low speed and heavy load, which cause the energy consumption of grinding operation to be very high. It accounts for a large proportion of the electrical consumption across the plant . The …
A SAG mill overload is a highly nonlinear operating situation, and we show that principal component analysis, the best-in-class technique currently used by the industry for monitoring an overload ...
