By E Barsky

The authors describe the theoretical paintings and useful effects got in recent times within the quarter of class of powders in relocating flows. The promising nature of the cascade class approach is under pressure. Mathematical versions of normal, mixed and abnormal cascades are defined. Mathematical basics of the structural, dynamic and kinetics versions of the method are provided. a brand new method of optimising the class tactics, in accordance with the type curves and data conception, is defined. adventure with the economic program of cascade classifiers is gifted. this is often the most certain booklet during this very important sector, offers a close account of the person type approaches

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The unambiguity may be determined from the analysis of the equation β − Ds b − Rs E f − Ec = Ex − ≠ 0. R D s s M. Vaga used a very unusual method to evaluate the efficiency of enrichment processes: E= β −α 1− ε f (II-26) This relationship will now be analysed: 1. For ideal separation β = 1; ε f = 1; E = 1−α → ∞; 0 2. In separation into parts without any change of the composition E= α −α = 0; Kc 3. The unambiguity E f − Ec = β − Ds f − Rs − ≠ 0. Vaga is insufficiently convincing. Taryan estimates the efficiency of enrichment of coal on the basis of the practical yield of the concentrate and contamination of the concentrate with heavy fractions in the form: E= γ f (1 − γ f ) − d f γ f (1 − γ f ) (II-27) where d is the yield of the heavy fraction in the concentrate.

In separation into parts without any change of the composition E= α −α = 0; Kc 3. The unambiguity E f − Ec = β − Ds f − Rs − ≠ 0. Vaga is insufficiently convincing. Taryan estimates the efficiency of enrichment of coal on the basis of the practical yield of the concentrate and contamination of the concentrate with heavy fractions in the form: E= γ f (1 − γ f ) − d f γ f (1 − γ f ) (II-27) where d is the yield of the heavy fraction in the concentrate. The insufficient accuracy of this equation is evident because it is not possible to characterise sufficiently he quality of separation only by calculation of the quantities representing the ratio of yields.

Ya. Ya. Rubinchik is reduced to the expression: Dc = R f F. I. I. Povarov, the particles of the boundary size in the optimal regime are separated in proportion to the yields of the classification products, 45 F ( x) = Ff ( x) Fc ( x ) = γf (II-33) γc Analysis shows that this equation is valid only in a partial case. To confirm this, it will be attempted to find the value of the boundary grain on the basis of analysis of the principle of classification in the most general form. It is well-known that the optimality condition may be obtained by equating to zero the first derivative of the expression of efficiency with respect to the value of the particle size separation.