Abstract
The authors present a description of the method used for calculating the unit energy expenditure for driving the mill compressor and for driving its auxiliary mechanisms, as well as the operating costs and the amortization deductions. The authors maintain that such a description is necessary for the successful incorporation of countercurrent jet mills into various branches of the construction-materials industry. An analysis of the operation of Soviet and foreign industrial jet mills has made it possible to establish the value of Tarrant coefficient in the relation determining the cost of comminution for known electrical-energy price and the total unit energy expenditures, as shown in this article. Values of the bond coefficient for energy and gaseous energy carrier expenditures in the grinding of some materials on an MSP-25 experimental-industrial jet mill are presented. Also shown is a rhythmic series of basic unit energy expenditures for different materials when they are comminuted in a jet mill.
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