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Title Floatability of coal and pyrite
Creator/Author Le, H.V.
Publication Date1977 Jul 01
OSTI IdentifierOSTI ID: 7141623
Report Number(s)IS-T-779
DOE Contract NumberW-7405-ENG-82
Resource TypeTechnical Report
Research OrgAmes Lab., IA (USA)
Subject010402 -- Coal, Lignite, & Peat-- Purification & Upgrading; ;COAL-- DESULFURIZATION;COAL-- FLOTATION;PYRITE-- FLOTATION; ADDITIVES;ALCOHOLS;COAL PREPARATION;EFFICIENCY;IOWA;PH VALUE;RECOVERY;REMOVAL;RESEARCH PROGRAMS;SURFACTANTS
Related SubjectCARBONACEOUS MATERIALS;CHALCOGENIDES;CHEMICAL REACTIONS;COMMINUTION;ENERGY SOURCES;FOSSIL FUELS;FUELS;HYDROXY COMPOUNDS;IRON COMPOUNDS;IRON SULFIDES;MIDWEST REGION;MINERALS;NORTH AMERICA;ORES;ORGANIC COMPOUNDS;PYRITES;SEPARATION PROCESSES;SULFIDES;SULFUR COMPOUNDS;SULFUR ORES;TRANSITION ELEMENT COMPOUNDS;USA
Description/Abstract An experimental investigation was carried out to improve the froth flotation method of separating coal pyrite.^The effect of several surface active agents on the floatability of an Iowa coal and its associated pyrite was studied in both the presence and absence of methyl isobutyl carbinol (MIBC), a commonly used frother.^The effectiveness of a special method of chemical pretreatment for depressing pyrite was also investigated.^The zeta potential of the same coal and pyrite was measured under the same conditions used in the flotation tests (in the absence of frother).^In the absence of MIBC, the floatability of coal and pyrite was low, and appeared to depend on pH.^The maximum recovery of pyrite was obtained at a pH of 4.5 with recovery being less at higher or lower pH.^The addition of a small amount of MIBC significantly increased the recovery of coal and pyrite with the increase in the recovery of coal being much greater than the increase in the recovery of pyrite.^Also in the presence of MIBC, the floatability of coal and pyrite seemed to be affected more by pH than in the absence of MIBC.^On the other hand, several potential pyrite depressants were found to be ineffective in the presence of MIBC.^The special chemical pretreatment reduced the floatability of pyrite markedly while not greatly affecting the floatability of coal.^Measurement of the zeta potential of coal and pyrite suspensions in dilute aqueous solutions of various reagents provided an indication of adsorption phenomena.^However, there appeared to be no consistent direct correlation between zeta potential and floatability.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 112
AvailabilityDep. NTIS, PC A06/MF A01.
System Entry Date2001 May 13

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