Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1978-10-06
1980-09-16
Halper, Robert
Classifying, separating, and assorting solids
Fluid suspension
Liquid
B03D 102
Patent
active
042228620
ABSTRACT:
A method and treating agent for increasing the yield of oxidized coal or coal from surface or strip mines where said coal particles are concentrated by froth flotation. The method consists of utilizing as a promoter or frothing aid 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.
The preferred promoter or frothing aid for oxidized coal is a water-in-oil latex of sodium polyacrylate 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 hydrophilic (or activator) 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. The latex emulsion has demonstrated superiority as a flotation promoter for oxidized coal over the dry polymer and exhibits synergism over the dry polymer and over the components of the latex emulsion including a paraffin solvent, a hydrophobic emulsifier such as sorbitan monooleate, a solvent such as Espersol 3-E (Charter; an aromatic blend) and stabilizers such as polyisobutylene and aluminum tristearate.
REFERENCES:
patent: 3284393 (1966-11-01), Vanderhoff
patent: 3493501 (1970-02-01), Eck
patent: 3624019 (1971-11-01), Anderson
patent: 3734803 (1973-05-01), Anderson
patent: 3826771 (1974-07-01), Anderson
patent: 3856618 (1974-12-01), Shubert
patent: 3919080 (1975-11-01), Stauter
patent: 3997492 (1976-12-01), Kane
patent: 4024216 (1977-05-01), Finch
patent: 4077930 (1978-03-01), Lim
Chem. & Tech. of Coal, Agroskin, Published for U.S. Dept. of Int. & NSF by Israel Program 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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