Beneficiation dewatering-filter
Beneficiation dewatering-filter The separation of solids from liquid by gravity can be easily done by batch or continuous sedimentation processes. The underflow, however still contains appreciable amounts of liquid and the overflow can contains some amount of solids. Further removal of liquid is necessary for some down stream operations. The removal of this liquid is usually possible by passing the suspension through a semi-permeable membrane which is designed to hold the solids and permit the liquid to pass through. In effect the membrane forms a screen. In the early stages of separation across this membrane the solids deposit forming a second semi-permeable medium or cake. These two layers then form the filtering medium for the remainder of the slurry. The structure of the filtering cake changes continuously as more particles deposits with time. The main changes relate to permeability and porosity of the filtering zone. The permeability of the cake depends on the particle size, s...