Abstract
A new method for the measurement of apparent viscosities and densities of mineral slurries is explored. The slurry is drawn up into a vertical tube using a reduced pressure and allowed to drain under the influence of gravity alone. The drainage velocity of the slurry down the vertical tube is a function if its viscosity as well as other quantifiable variables. This is the basis of the operation of the measurement device. Useful features of this device include the fact that it has no moving parts, is inexpensive and robust and is subject to little wear. The measurement can be performed directly on the stream in question and it is unlikely to be blocked up by fibers/particles. A self cleaning facility may also be included. A measurement of the percent solids of the slurry may also be obtained.A full description of the equipment is given and the theoretical basis of its operation is examined. The results of some test work conducted at a pilot scale mill are also presented.
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