A novel rapid flotation system based on the air-injected hydrocyclone.
Spears DR; Jordan CE
1991 SME Annual Meeting, February 25-28, 1991, Denver, Colorado. Littleton, CO: Society for Mining, Metallurgy & Exploration, preprint 91-84 1991 :1-8
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.
OP; Conference/Symposia Proceedings
1991 SME Annual Meeting, February 25-28, 1991, Denver, Colorado, preprint 91-84