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Previous to the flotation of non-sulphide minerals frequently desliming operation is required. Due to insufficient desliming the flotation performance in plant is sometimes inferior than that in laboratory. To avoid such trouble the author contrived a quantitative representation of desliming performance.<BR>1) When slime is sufficiently dispersed in water, superfine slime would behave with water. Slime rejection, which means the distribution of harmful superfine slime rejected to overflow, could be defined as the distribution of water to overflow. Desliming performances can be re-presented quantitatively with slime rejection R and yield Z which is the distribution of solid to underflow.<BR>2) Quality of the deslimed product can be evaluated with relative slime content S, which is defined as:<BR>S=(1-R)/Z (5)<BR>S and Z are more suitable for evaluating the performance of a desliming operation than R and Z.<BR>3) Total performance of multi-stage desliming circuit is calculated with R and Z of constituent stages (eqs. 8 to 23). R and Z of each stage are determined by pulp densities as shown in eqs. 1 to 4. Actual pulp densities can be used for this calculation, even in the case that additional wash water is introduced into the circuit.<BR>4) The more stages in the circuit, the better performance is obtained. However, the character of the circuit depends greatly on the type of circuit. Total performances of various desliming circuits (fig. 1 to 4) are demonstrated in table 1.<BR>5) Total performance is influenced with any variation in constituent stages. In the case of three stage closed circuit illustrated in fig. 3(2), the influence of each stage is discussed (eqs. 24 to 31). Increase of feed rate to the primary stage due to the circulating load is also discussed (eqs. 32 to 40).<BR>6) An application to the desliming operation on hematite flotation in Akatani mine is de-scribed briefly (table 2). Noticeable reduction of S value from 13.4% to 1.67% was resulted by conversion of desliming circuit (fig. 5), and the flotation performance was remarkably improved.
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