Velocity Profile Measurements Within a Laboratory Flotation Cell.
Fluid/particle Separation J 1990 Jun; 3(2):71-75
The U.S. Bureau of Mines used an electrochemical technique to measure the velocity profile within a laboratory flotation cell. A small dual-electrode probe was inserted into a fluid containing ferric and ferrous cyanide. With a -300-mv potential at the current limiting cathode, the transport of ferric cyanide ions to this cathode controlled the electrode current. The fluid velocity moving past this small cathode surface (0.001 Mm2) was directly related to the ferric cyanide ion diffusion rate and the electrode current. After calibrating the electrode with known fluid velocities, the current measurements of the electrode probe instantaneously measured the fluid velocity at the cathode surface. Using a computer for automated data acquisition, the velocity profile was mapped throughout the laboratory flotation cell at different impeller rotation speeds. From the velocity profile, the distribution of the dissipation energy was computed and correlated with the flotation response of a copper ore.
Fluid/particle Separation J., V. 3, No. 2, June 1990, PP. 71-75