By Jan Leja
The means of froth flotation is a phenomenal instance of utilized floor chemistry. it's largely utilized in the mining, mineral, metallurgical, and chemical industries for separation and selective focus of person minerals and different solids. elements so targeted function uncooked fabrics for generating acceptable metals and chemical compounds. the significance of flotation in know-how is mainly end result of the ease with which it may be made selective and flexible and to the economic climate of the method. the target of this e-book is to check the basics of floor chemistry including the correct elements of natural and inorganic chemistry that-in the opinion of the author-are very important ~ regulate of the foam flotation method. The assessment updates the knowledge that were on hand in books by way of Sutherland and Wark (1955), Gaudin (1957), Klassen and Mokrousov (1963), and GIembotsky et al. (1963). It emphasizes mostly the outside chemical elements of the method, leaving different proper subject matters resembling hydrodynamics, mechanical and electric expertise, cir cuit layout and engineering, operations study, instrumentation tech nology, modeling, etc., to acceptable really good treatments.
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Extra info for Surface Chemistry of Froth Flotation
Example text
With a proper control of these parameters a sequential selective flotation has been found possible for a large number of ores, comprising solidified mixtures of sulfides liberated at relatively coarse sizes from nonsulfide gangue minerals. e[ IAI 95 . . . . . . . . ·. . ·. ·.... ' ...... / .... ' ... -:~ ....... 7. Threshold concentration of collector. , CA, Cc , and CB , for a 95% recovery. Such differentiation is the basis for selective separations by flotation. However, in practice the selectivity is achieved not so much through different concentrations of collector alone but through a combined effect of activating and depressing agents together with the collector species.
Sutulov (1974) gives detailed accounts of the world's porphyry deposits, the associated processing technology, and metallurgical production data. At present, porphyry copper deposits are responsible for approximately half of the total copper production. The need to supply the market requirements from such low-grade ores resulted in a spectacular development of the open pit mining technology and, at the same time, in an equally spectacular increase in throughput of associated flotation plants. Some 50 years ago, flotation plants had 100-300 tonne/day capacities and "-' 25 years ago, 1000-3000 tonne/day capacities, whereas most of the recently constructed plants range from 20,000 to 60,000 tonnes/day, with a few which are in the 100,000-175,000 tonne/day range.
The first attempt at selective separation of galena from sphalerite was made in 1912 at the Zinc Corporation mill in Broken Hill, Australia [Diamond (1967)] and that of a selective separation of chalcopyrite from pyrite by the Granby Company at Anyox, British Columbia, Canada, in 1918 [Petersen (1967)]. The reagents employed were distillation products of coal or wood: coal tar creosote and wood tar or wood oils. t Once xanthates were introduced in 1923, the selective flotation separations of individual sulfides proved unusually successful from ores containing dolomitic gangue minerals, especially when the valuable sulfides were liberating at relatively coarse sizes.