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V
Ft
In the formula 过滤 - filtration speed, m 3 / m 2 · seconds;
V - filtrate volume, m 3 ;
F——filtration area, m 2 ;
t - filter time, seconds.
Productivity filter have different representations for different purposes, in the beneficiation plant, said filter area per hour per square meter of the obtained dry cake kilograms. Expressed as:
1 q
Q=—— ×——, kg/m 2 · hour (2)
C TF
Where Q - the productivity of the filter, kg / m 2 · hour;
C——the ratio of the weight of the wet cake to the weight of the dry cake;
T - filtration time, hours;
F——filtration area, m 2 ;
q——The weight of the wet cake obtained in t time, kg.
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
60δH
Q=—————, kg/m 2 · hour t
Where Q - the productivity of the filter, kg / m 2 · hour;
δ - density of dry filter cake, g / cm 3 ;
H - filter cake thickness, mm;
t——The time and minute of each revolution of the filter.
In the current application of the above formula, since the composition of the ore is not very large, the dry filter cake density δ and the time per revolution of the filter can be taken as constant. Therefore, productivity can be obtained by measuring the thickness of the filter cake.
Example processing plant with a size of 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 g / cm 3 ; the copper concentrate density is the dry cake density.
H = 20 mm; t = 6 minutes
60δH 60×1.5×20
So Q=——— = ——————— = 300 kg/m 2 · hour t 6
Therefore, the productivity of the 20 m 2 filter is 6 tons per set. [next] 
The filtration rate is the filtrate flow rate per square meter of filtration area per unit time. Expressed as:
υ = ——, m 3 / m 2 · seconds (1)