Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1989-08-17
1991-06-11
Silverman, Stanley
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209166, 252 61, B03D 102
Patent
active
050229834
ABSTRACT:
A flotation process is disclosed for cleaning of particulate coal and separation therefrom of pyrite and ash. A flotation pulp is prepared comprising a particulate coal feed material and an anionic surfactant selected from among alkanesulfonic acids, alkenesulfonic acids, alkynesulfonic acids, arenesulfonic acids, alkyl sulfuric acids, alkenyl sulfuric acids, alkynyl sulfuric acids, aryl sulfuric acids and salts of these acids. Among the particularly preferred surfactants are substituted ethenesulfonic acids and salts thereof. Other preferred embodiments include the use of at least about 0.3 pound surfactant per ton of particulate feed material; implementation of the process via aggregate flotation, in which at least about 50% by weight of the particulate coal feed material is smaller than about 400 mesh; and use of combinations of anionic surfactants and nonionic frothing agents. A novel composition of matter comprising the anionic surfactants adn a nonionic compound is also disclosed.
REFERENCES:
patent: 2074699 (1937-03-01), Lenher
patent: 2102370 (1937-12-01), Merriss
patent: 2112362 (1938-03-01), Gillson
patent: 2120217 (1938-06-01), Harris
patent: 2346151 (1944-04-01), Burk
patent: 3394893 (1968-07-01), Moss
patent: 4199065 (1980-04-01), Wang
patent: 4308133 (1981-12-01), Meyer
patent: 4830740 (1989-05-01), Klinpel
"Optimizing Coal Cleaning/Pyrite Removal of the use of Cis-Dialkylethelene Sulfonate Reagents", Quarterly Technical Report for Center for Research on Sulfur in Coal (CRSC).
Preceedigns, 1st Annular Pittsburgh Coal Conference, Sep. 17-21, 1984, "A Preliminary Investigation on the Application of Colloidal Gas Aphrons for the Coal Cleaning", by Yoon and Miller.
"The Effect of Bubble Size on Fine Coal Flotation", Coal Preparation, 1986, vol. 2, pp. 179-192.
Myers Cal Y.
Read Richard B.
Shideler Krisanne
Silverman Stanley
Southern Illinois University Foundation
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