80 years it was the predominant mill for grinding of raw materials and coal, and still ... cost of installation, cost and ease of maintenance, product quality, versatility, etc. ... cement ground in OK mills similar to those for cement ground in ball mills (BM), as shown in Figure 6.

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Grinding media and wear lining costs range between 0.41 $/t and 1.82 $/t. Option 3 has much higher media and wear lining costs because two ball mills of 8.8 MW installed power each are required to grind 8 Mtpa of RMS concentrate from P80 2.3 mm to P80 75 μm. The overall OPEX for Option 3 is the highest due to the high costs of media and liner ...

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The regrinding cost will generally be only a small fraction of the primary grinding cost. Therefore, for this purpose, a lower order of accuracy is adequate in the case of regrinding. The general procedure is first to calculate the kilowatt-hour per ton for grinding the rougher concentrate resulting from each primary grind to 80 percent passing ...

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Ball Mills can be supplied with either ceramic or rubber linings for wet or dry grinding, for continuous or batch type operation, in sizes from 15″ x 21″ to 8′ x 12′. High density ceramic linings of uniform hardness male possible thinner linings and greater and more effective grinding …

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SAG grinding) and Bond Ball mill work index, BWi (for ball mill grinding). A further measure, the Minnovex crusher index, Ci was also measured for use in the CEET program to determine SAG mill feed size (Kosick and Bennett, 2001). The SPI values varied from 13.5 to 107 minutes with an average of 53 minutes. This variability, although apparently ...

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Typical Cost of Grinding. The main costs for grinding are energy, liners and grinding media. They are different for different mill types. For tumbling mills: Diagram of cost breakdown by mill …

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mill equipment size, but also dictates how to operate the mill, whether continuous or batch operation is required, and whether the process can be performed in-house or if a tolling service is a better option. The required product size is an important grinding cost factor, especially for fine-size grinding…

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dard Circuit, assume 2.44 m diameter overflow mills, and use a rod mill F80 of 16,000 µm and a rod mill P80 of 1,000 µm. Note that—in order for no correction factor for ball mill product fineness to apply—the ball mill circuit P80 should be no less than approximately 70 µm (Bond, 1962). This

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Ball Mill Power Calculation Example #1. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ¼ inch (6350 microns). The required product size distribution is to be 80% passing 100 mesh (149 microns). In order to determine the power requirement, the steps ...

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mills illustrates the scale and cost of a test aimed at measuring the durability and cost-effectiveness of a particular type of ball. If M is the total mass of the charge within a mill and dM/dt is the rate at which the balls are consumed, the time constant of a mill is θ = - ( Eqn. 1)

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