C O N S U L T I N G L T D TECHNICAL MEMORANDUM
EF5BM=[ P80+10.3 1.145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a "single-stage ball mill" calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies …
BrainWave: Control solutions for SAG mills
BrainWave SAG mill is a unique control package using patented model-based predictive adaptive control technology. It is well known within the mining industry that effective grinding in a SAG mill depends largely on the loading of the mill. A mill con - taining too much material does not allow for adequate movement of the ore and balls within ...
Used Sag-mills For Sale
Inventory ID: 6C-GM01. UNUSED FL 36' x 17' (11m x 5m) SAG Mill with 13,500 kW (18355 HP) Wrap Around Drive
(PDF) Operation Analysis of a SAG Mill under Different
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 ...
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Modelling SAG Milling Power and Specific Energy …
size, ball load, mill speed and % solids will represent the total load. Ball Mill SAG Mill Scw Jb Pc % -6" +1" N/Nc Fresh Feed Water Water Pebble Crusher Screen Cyclones Sump Pump Fig. 1. SABC A/B milling circuit. Scw = solid concentration by weight fraction in the SAG mill feed; Jb = balls charge (bulk fraction of the SAG mill volume); N/Nc ...
I-203 I-204 INTRODUCTION
be expected to behave in a different manner when fed to a sag mill. Despite the limitations of using the F80 it can be seen from Figure 2 that on average an increase in F80 for this particular mill (sag mill with 12-15% balls) causes a higher specific energy and a consequent lower throughput at constant mill power. Over the range of F80 covered ...
SAG Mill Optimization using Model Predictive Control …
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).
Sag Mill Maintenance
The hours, days or weeks needed to get a mill back on line are often filled with tense periods of trouble-shooting and scrambling to locate and acquire needed parts, and the characteristics that make SAG mills such robust performers — powerful drives, massive components and capacity to carry a thousand tons or more of ore and grinding balls ...
Электрон жин зарна
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Grinding Mill Control
The acoustics of the mill charge motion is measured by a device mounted adjacent to the SAG Mill shell. The resulting signal is transmitted to the acoustic indicating controller which, in turn, sends a remote set point to the SAG mill speed controller. The speed of the SAG mill is then automatically adjusted (within set limits) to maintain the ...
CALCULATION OF THE REQUIRED SEMIAUTOGENOUS …
the required SAG comminution of test ore material. Specific energy consumption (SEC) measured in kWh/t is a ratio of the mill drive power to the milling circuit output, without regard to circulating load. At the constant size of the cycle feed and discharge, SEC is a prime characteristic of material grindability in a certain ore pretreatment ...
AMIT 135: Lesson 6 Grinding Circuit – Mining Mill …
Semi-Autogenous Grinding (SAG) Mill Wet or dry Higher capacity than A-G mill grinding Primary, coarse grinding (up to 400 mm feed size) Grinding media is grinding feed plus 4-12% ball charge (ball dia.100- 125 mm) High capacity (short retention time) Less sensitive to feed composition (critical size material) Semi-Autogenous Mill
A comparison of SAG mill power models
varying it as the mill water addition rate changes. Loveday/Barratt Model Brian Loveday published a simple SAG mill model (Loveday, 1978) of the form in Equation 2. The equation uses mill dimensions (inside the liners), the density of the mill charge and an empirical "power number" that encapsulates the mill speed and volumetric filling.
SAG Mill | Autogenous and Semi-Autogenous …
Since the early 1980s, we have been designing and manufacturing Semi Autogenous Mill (SAG Mill) and Autogenous Mill (AG Mill) under the Fuller-Traylor brand. Semi-autogenous grinding uses a minimal ball charge in the range of 6-15% while autogenous grinding uses ore only.
Optimizing your SAG mill operation
The amount of pebbles passing through the grate increases with the angle of the grate. It is imperative to ensure the efficient removal of both slurry and coarse pebbles (critical size) in order to ensure the efficient operation of AG/SAG mills. Elimination of the above mentioned material transport problems will allow the mill to respond truly ...
Operation Analysis of a SAG Mill under Different …
in the semi-autogenous grinding process by dynamically modeling the SAG mill-pebble crusher loop to improve the SAG mill throughput. Cleary [8–10] studied the e ect of rock particle shape on the dynamic filling and energy utilization in a SAG mill and analyzed the operation status of a SAG mill under di erent collision conditions through the ...
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AN UPDATED DATA SET FOR SAG MILL POWER MODEL …
measurement point (PDCS) and the power available at the shell of the mill (Pshell). Austin SAG Model The SAG mill model by proposed by Leonard Austin (1990) was largely based on modifications of earlier tumbling mill models by Hogg & Fuerstenau and F. Bond. The model is loosely structured as a kinetic and
C O N S U L T I N G L T D TECHNICAL MEMORANDUM
cient circuit of SAG milling followed by ball milling should be 10% less efficient that the "maximum efficiency" grinding circuit (crushing, single-stage ball mill). Thus, the Etotal of …
Comparison of SAG mill feed size & throughputs
The SAG mill circuit also includes a single-deck screen and a cone crusher while the ball mill circuit utilizes hydrocyclones. Currently, the grinding circuits are inefficient in achieving the ...
(PDF) Operation Analysis of a SAG Mill under Different
As one of the machines widely used in mining, a semi-autogenous grinding (SAG) mill can significantly improve the roughing efficiency of rock. But the SAG mill still faces the obstacles of...
SAG Mill Grinding Circuit Design
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SAG Circuit Design
Unfortunately I have a program for SAG mills and grinding circuits. Computational testing showed that: - Capacity of SAG Mills can increase to 10000 t/h. - The number of ball mills should be 2-4. - The capacity of the SAG mill with pre-crushing by 20-30% more than the SAG mill with the crashing critical size.
SAG Circuit Design
SAG mill grates generally limit pebble extraction rates to around 25%, so you can't expect a throughput increase of more than 5-10% depending on the ore. To pebble crush, you need to port the grate. This removes any fine media, so achieving a fine grind size in a single stage becomes difficult.
SAG Mill Components
SAG Mill Components Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell …
SAG Mill Grinding Circuit Design
SAG Mill Liner Design In summary: A broad range of AG/SAG circuit configurations are in operation. Very large line plants have been designed, constructed, and operated. The circuits have demonstrated reliability, high overall availabilities, streamlined maintenance shutdowns, and efficient operation.
SAG Mill Optimization using Model Predictive …
MPC has been successfully applied to SAG mill control at several copper mines in South America. In each case, MPC was used to enhance or replace elements of the existing …
ЭЛЕКТРОН ЦАХИЛГААН ЖИН ЖИНЛҮҮР КГ ЗАРНА …
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Schematic Flow Sheet of the AG/SAG Mill Model.
The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 years, but the ability to simulate the effects of blending hard and soft components on mill performance remains ...