Effect of Open Circuit Grinding on Efficiency

EF2 – Open Circuit Grinding – When grinding in open circuite ball mills, the amount of extra power required, compared to closed circuit ball milling, is a function of the degree of control required on the product produced. The inefficiency factors for open circuit grinding are given in Table 1.

TABLE 1: OPEN CIRCUIT INEFFICIENCY MULTIPLIER

Product Size Control

Reference % Passing

Inefficiency Multiplier

  • 50
  • 60
  • 70
  • 80
  • 90
  • 92
  • 95
  • 98
  • 1.035
  • 1.05
  • 1.10
  • 1.20
  • 1.40
  • 1.46
  • 1.57
  • 1.70

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