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A Novel Rapid Flotation System Based on the Air-injected Hydrocyclone.

Spears-DR; Jordan-CE
SME Preprint 91-84 1991 :8 pages
The U.S. Bureau of Mines has developed a fast air-injected hydrocyclone-shallow tank (fast) flotation system. Conventional flotation cell kinetics are a compromise between two conflicting requirements, the need for an agitated zone for rapid bubble- particle collision, and a quiescent zone for bubble-pulp separation. The Bureau of Mines has designed a flotation system in which bubble- particle collision and bubble separation are carried out in two discrete unit operations. A bubble slurry was mixed with an ore slurry at a high rate in a modified air-injected hydrocyclone for rapid bubble-particle collision. The mixture was then fed into a unit specially designed for rapid separation of the bubbles from the pulp. A conventional flotation cell required 2.8 Min to obtain 90- pct recovery at a 7-pct cu rougher concentrate grade, whereas the fast flotation system can obtain 85-pct recovery with a 13-pct cu rougher concentrate grade in 0.28 Min, and 92-pct recovery with a 7- pct cu grade in 0.56 Min. The Bureau's fast flotation system is adaptable to a wider variety of flowsheets and could potentially allow for replacement of conventional flotation cells with smaller and faster units.
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OP 88-91
NIOSH Division
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SME Preprint 91-84, 1991, 8 PP.