Grinding & Classification Circuits

Grinding & Classification Circuits

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grinding concrete bases (1 reply)

Jorge Quintanilla
10 months ago
Jorge Quintanilla 10 months ago

Hello everyone.

I am working on a new mining project in Bolivia. The listed mills are:

METSO 9x13 Feet Ball Mill with 500 HP motor

METSO10.5x14ft Rod Mill with 700 HP motor
The design of the foundation for dynamic equipment consists of two parts, the first is calculated by static loads, this can be done with the weight of the equipment.
For the second part, the validation of the dynamic response, which is to validate the amplitude of vibration and frequency, already requires the dynamic loads and their distribution, and the frequency of the equipment.
The METSO Company does not want to provide more information until the first payment is delivered for the mills, meanwhile civil engineering is stopped on this issue. We only have a reference plane of the mills.
How can I assume the dynamic load of the mills?
If I do not have the mill and the suppliers do not want to deliver the information until the first installment is deposited, how can I advance this calculation of civil engineering? I would like to know some tips to be able to get closer to defining the dynamic loads until the supplier sends his information.
I don't know if it is worth doing a vibrational analysis or ODS of another similar or larger mill?
Or, definitely, due to the low speed of the mill, there is no point in carrying out a very deep analysis of the dynamic loads.
Please any help is welcome.

Thanks in advance

10 months ago
SmartDog 10 months ago

First off the static load is not just the weight of the equipment, it also includes the charge and the feed (ore + water).  The dynamic load is the static load + the impact load of the cascading media (charge) and ore + water at the operating rpm's.  Actually it is better to use the maximum rpm's (or just before pinned load).

As to continuing the civil design, while the details of the foundations (steel and concrete stress calcs) need the information from the vendor, the size of the foundations is often dictated by the footprint and the static load.  This will allow you to work on everything else except the foundation details.  

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