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Explanatory notes on Mill video
Taken at a Platinum mine, Rustenburg, South Africa
![Page 2: Explanatory notes on Mill video Taken at a Platinum mine, Rustenburg, South Africa](https://reader035.vdocuments.net/reader035/viewer/2022062311/5a4d1aec7f8b9ab05997b5d0/html5/thumbnails/2.jpg)
Explanatory notes on Mill videoView inside the mill
Taken with an Infrared camera
To determine whether the MSS HMI accurately depicts the ore angle in the mill
![Page 3: Explanatory notes on Mill video Taken at a Platinum mine, Rustenburg, South Africa](https://reader035.vdocuments.net/reader035/viewer/2022062311/5a4d1aec7f8b9ab05997b5d0/html5/thumbnails/3.jpg)
Human Machine interface(HMI) of the Mill Safe Start
HMI of the MSS in a control room of a mine
Graphical depiction of the ore and the mill
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Explanatory notes on Mill video
Camera is facing towards the back of the mill
Top of the ore/ water mixture
![Page 5: Explanatory notes on Mill video Taken at a Platinum mine, Rustenburg, South Africa](https://reader035.vdocuments.net/reader035/viewer/2022062311/5a4d1aec7f8b9ab05997b5d0/html5/thumbnails/5.jpg)
Explanatory notes on Mill video
Direction in which the mill is moving
Approximate angle of ore
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HMI interface
As the drum turns, the angle of the mill and the ore are calculated and depicted by the graphical mill turning
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HMI interface
At the same time the angle of the mill drum is plotted against the ore angle
mill drum angle
ore angle
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HMI interface
• If the ore has not tumbled yet, the mill angle is the same as the ore angle, and
• the graph stays at 45deg
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• The mill will trip
• If the ore sticks to the drum, the ore angle does not deviate from the mill angle and
TRIP
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• As the ore tumbles, the angle of the ore changes relative to the mill angle
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• As the mill drum keeps on turning, the angle keeps changing
• But the ore angle flattens out
SA
FE
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Ore and water tumbling
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A Safe start and no need for the MSS to trip the mill!