Closely graded slurries exist when 
Homogeneous slurry: one which does not tend to separate immediately when it becomes still. These slurries have high pulp densities (>50%w/w, and a high proportion of fines (<50 um)), and the solids are uniformly distributed throughout the liquid carrier. Note that as the concentration of particles exceeds 40% by weight, the mixture becomes more viscous and develops non-Newtonian properties.
Heterogeneous slurry: one which will tend to separate immediately when flow movement is halted. A gradient concentration exists in the vertical plane, and a minimum carrier velocity is required. Typically types of flows are encountered in mineral processing plants.
Pulp density is the percentage of solids in the slurry mixture, by weight.
Static lift () is the vertical height through which the slurry is to be raised. (Strictly speaking, it is the vertical difference between the free surface of the slurry in the pump sump and the discharge point. That is, it includes the entry losses in the suction piping, and the friction loss from the sump outlet to the pump mouth)
Equipment head is the the pressure drop across an inline device (e.g. a cyclone) necessary to achieve its process duty. This pressure is usually quoted in kPa and must be converted to meters of slurry head (
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