Medium υ - filtration speed, m 3 / (m 2 · sec);

V - filtrate volume, m 3;

F——filtration area, m 2;

t - filter time, seconds.

The productivity of the filter has different representations for different purposes, and in the concentrator it is the number of kilograms of dry cake obtained per square meter of filtration area per hour. Expressed as:

Q - the productivity of the filter, kg / (m 2 · hour);

C——the ratio of the quality of the wet cake to the quality of the dry cake;

T - filtration time, hours;

F——filtration area, m 2;

q——The quality of the wet cake obtained in t time, in kilograms.

It is inconvenient to obtain the productivity of the filter according to the above formula in actual production. It is easier to apply the following formula, ie

Q - the productivity of the filter, kg / (m 2 · hour);

δ - the density of the dry filter cake, g / cm 3;

H - filter cake thickness, mm;

t——The time and minute of each revolution of the filter.

When the above formula is applied in the concentrator, since the composition of the ore is not very large, the dry filter cake density δ and the first turn of the filter can be taken as constants, so that the productivity can be obtained by measuring the thickness of the filter cake.

Example Specification of a processing plant 20 m 2 filter outer cylindrical filtration filter type copper concentrate, a known filter for each revolution time of 6 minutes, copper concentrate density of 1.5 g / cm 3, and the filter was measured The filter cake thickness is 20 mm, and the productivity of the filter is obtained?

It is known that δ = 1.5 cm 3 ; the copper concentrate density is the dry cake density.

H = 20 mm; t = 6 minutes

Therefore, the productivity of the 20 m 2 filter is 6 tons / (table · hour).

If the number of revolutions of the filter is n in the hour of T, the time per revolution of the filter is t;

The mass q of the wet cake obtained in T hours is:

Where δ1 - the density of the wet cake, g / cm 3; H - the thickness of the filter cake, mm; S - the filtration area, m 2.

Substituting the above T, q, and C values ​​into the formula (7-1),

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