Flotation machine evolution over the past 6 decades saw first a proliferation of design developed to fit different concepts of process mechanism, or to provide best for the requirement considered most important. Up to the 1930’s, hundreds of designs had been patented and dozens used; between then and the 1960’s, all had become obsolete but the sub-aeration, self aerated and pneumatic types. Today, even the latter has practically disappeared in original form.
The process of elimination has been the results of trends towards design simplification, not necessarily yielding optimum conditions for each requirements, but permitting simpler construction, lower operation and maintenance costs, greater flexibility , and lower maintenance requirements than earlier more complicated designs.
The more recent trend, within the last decade particularly, has been towards larger, metallurgical efficient and more cost effective machines. This depart from the simpler tank/mechanism combination towards design which segregate and direct flow and towards providing an external air supply for types which had been self aerating and towards the application of hydrodynamic principles to cell design like the DELKOR BQR range of flotation machines.
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