![]() ![]() In a Rotary Drum Filter any water left in the cake after a compartment has risen above the level of the axis of the drum tends to drain by gravity back into the cake, which is then dried solely by the current of air drawn through by the vacuum pump. In the latter machine, directly a compartment has risen to the level of the axis of the drum, the water drains straight out of the cake by gravity. The formation of the cake is not so uniform in a rotary disk filter as in an drum filter nor does the water drain so evenly. It also occupies less floor space per unit of filtering area than the other two. The rotary disk filter is the only type capable of handling two concentrates in one machine, the vertical disc construction making it possible for the tank to be partitioned and each half used for a different product. Choosing a Rotary Disk or Rotary Drum Filter The moisture in the discharged cake normally ranges from 8 to 12%. per square foot, although this figure is generally exceeded under modern conditions. For the purposes of rough calculations it is usual to assume a capacity of 1,000 lb. of dry concentrate per square foot of filtering surface per 24 hours according to the nature of the material and the amount of water that it contains. The capacity of a vacuum rotary drum filter varies from about 200 to 2,000 lb. ![]()
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