Method and device for determining rheological properties

Details Method and device for determining rheological properties Method and device for determining rheological properties

1993-06-04

1994-06-21

Williams, Hezron E.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Viscosity

G01N 1114

Patent

active

053219740

ABSTRACT:
A method for the measurement of rheological properties of high density slurry materials and in particular high density mill tailings. A sample of the tailings is placed within a mixing tub, with mixing paddle used to effect the mixing. A digitally controlled electric motor is used to directly drive the paddle at a constant predetermined speed or speeds. Feedback control elements, including a variable speed drive and a computer constantly monitor the mixing speed and compensate for deviations therefrom. The tub is laterally pivotable against a load cell for a direct determination of reaction torque with correlation to viscosity and other rheological properties of the mill tailings. The load cell emits signals which are conditioned and fed to the computer which correlates torque to speed and determines the rheological properties on a continuous real-time basis. The computer also compares determined torque/speed parameters to stored rheological properties of known materials.

REFERENCES:
patent: 3875791 (1975-04-01), Fitzgerald et al.
patent: 4062225 (1977-12-01), Murphy, Jr. et al.
patent: 4299119 (1981-11-01), Fitzgerald et al.
patent: 4524611 (1985-06-01), Richon et al.
patent: 4535621 (1985-08-01), Gervais et al.
patent: 4879897 (1989-11-01), Booth et al.
Tattersall et al., "The Rheology of Fresh Concrete," 1983, pp. 77, 80, 82-83, 87, 89-91, and 262-265.

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