Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1978-01-19
1979-07-31
Halper, Robert
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209 5, B03D 102
Patent
active
041629663
ABSTRACT:
A method and treating agent for increasing the yield of deep mined coal mined from a site 100 feet or more below the surface where the particles in the coal are concentrated by froth flotation. This 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 deep mined coal is a water-in-oil latex of sodium polyacrylate 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 (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 deep mined 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 Espesol 3-E (Charter; an aromatic blend) and stabilizers such as polyisobutylene and aluminum tristearate.
REFERENCES:
patent: 3284393 (1960-11-01), Vanderhoff
patent: 3493501 (1970-02-01), Eck
patent: 3624019 (1971-11-01), Anderson
patent: 3734873 (1973-05-01), Anderson
patent: 3850618 (1974-12-01), Shubert
patent: 3997492 (1976-12-01), Kane
patent: 4024216 (1977-05-01), Finch
Chem. & Tech. of Coal, Agroskin, Published for U.S. Dept. of Int. & NSF, by Israel Program for Sci. Translations, 1966, pp. 33-43.
Chem. Abst., 82, 1975, 88349x.
Chem. Abst., 83, 1975, 62404g.
Halper Robert
Miller Robert A.
Nalco Chemical Company
Premo John G.
Roberts John S.
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