Conclusion

Column flotation has become the standard proven industrial flotation technique rather than an experimental method during the last decade. Nevertheless, its use in mineral-processing plants is mainly restricted at present to cleaning operations. The future of flotation equipment development lies in the combination of the advantages of impeller and column flotation and in the use of pneumatic machines in roughers.

As a greater share of flotation operations are used for unconventional areas such as environmental applications (water treatment, soil remediation, etc.) and ultrafine and colloid particle separation, special machines will be developed combining flotation attachment at intensive aeration and mixing conditions and three-phase separation in a quiescent environment. This leads to the concept of pre-aeration in a reactor (a unit for attachment of recovering phase on to gas bubbles) and de-aeration in a separator (a unit for separation of loaded bubbles from the bulk of three-phase suspension). Additional coarser bubbles can be added in a separator as a carrier to enhance the removal of loaded microbubbles by coalescence.

This concept and other types of new combined flotation machines will provide for more effec

M. T. Thew, University of Bradford, Bradford, UK

Copyright © 2000 Academic Press

Solar Panel Basics

Solar Panel Basics

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