Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1978-06-08
1980-09-16
Halper, Robert
Classifying, separating, and assorting solids
Fluid suspension
Liquid
B03D 102
Patent
active
042228611
ABSTRACT:
This invention relates to a method and treating agent for increasing the yield of larger particles of fine oxidized coal where the particle size is 28.times.100 mesh and preferably 28.times.70 mesh and where said coal particles are concentrated by froth flotation. The method consists of utilizing as a promoter an alkali metal or ammonium polyacrylate. A preferred promoter is about 0.05-1.5 lbs of sodium polyacrylate latex per ton of dry coal (0.017-0.5 lb of dry sodium polyacrylate per ton of dry coal), having an average molecular weight of about 100,000, to 1,000,000 and more, with a preferred range of 1,000,000 or more.
This preferred promoter or frothing aid for oxidized coal is a water-in-oil latex of sodium polyacrylate used with a water-in-oil emulsifier and preferably used with an alcohol-type frother. The latex may be utilized neat and self inverts with the assistance of an oil-in-water surfactant and the water in the system upon application to form an oil-in-water emulsion, or it may be used as a two part system with an activator (aqueous) to promote inversion. Additionally, the latex emulsion recovers larger particles in the size 100 mesh and greater and preferably in the range 28.times.70 mesh.
REFERENCES:
patent: 3284393 (1966-11-01), Vanderhoff
patent: 3493501 (1970-02-01), Eck
patent: 3624019 (1971-11-01), Anderson
patent: 3734873 (1973-05-01), Anderson
patent: 3850618 (1974-12-01), Herbert
patent: 3919080 (1975-11-01), Staute
patent: 3997492 (1976-12-01), Kool
patent: 4024216 (1977-05-01), Finch
Chem. & Tech. of Coal, Aposhis, Published for U.S. Dept. of Int. & NSF by Isiuel Pavgrsn for Sci. Translations, 1966, pp. 33-43.
Halper Robert
Miller Robert A.
Nalco Chemical Company
Premo John G.
Roberts John S.
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