Unique and difficult minerals processing measurement situations will be described and the
application of passive array-based technology for performing these measurements will be
illustrated. Examples of these situations include volume flow measurements in froth lines and
flotation feed lines with entrained air, slurry lines with magnetite and other magnetic ore, slurry
lines with abrasive or corrosive materials, high pressure lines, and slurry and non-slurry lines
exhibiting scale buildup. Other situations include measurement of entrained air levels in pipes
and in flotation columns. These measurements are achieved through CiDRA’s patented passive
sonar array-based technology. This technology performs two independent measurements – flow
rate and entrained air amounts. Two hardware implementations of this technology have resulted
in a non-intrusive flow and entrained air meter which easily is installed on the outside of the
pipe, and a submersible version for entrained air or gas holdup measurements which is used in
flotation processes. Recent developments in extending this technology to solve other unique
measurement problems such as valve movement confirmation will be covered.
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