C-model for power draw, an increasingly critical component in mill design validation
In a typical mine, the liners and lifters of a comminution mill are expected to last onlyIn a typical mine, the liners and lifters of a comminution mill are expected to last only 6-9 months and can cost upwards of US$500,000 to US$1,000,000 to replace. It is therefore important that the design of these components be carefully considered toensure that the mill runs as efficiently as possible while also limiting the effects of wear on the replaceable components.
CMD Consulting, a comminution consulting company in Australia, works with mines to help design more efficient and longer-lasting mill liners and lifters. Because the insides of these giant machines are nearly impossible to observe while in operation, CMD engineers pay close attention to the measurement of energy as a result of the operating conditions, such as mill filling and rotation speed. By using Morrell’s empirical C-model (Figure 1)— considered by many in the industry to be the most advanced mathematical model for predicting mill power draw—they are able to evaluate the energy costs oftheir designs. But measuring power provides only one piece to the mill design puzzle; CMD needed a way to consider the effects of liner wear on the design as well.
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