Control of pyrite surface chemistry in physical coal cleaning. Second quarterly progress report, December 1, 1989--February 28, 1990 Page: 3 of 26
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INTRODUCTION
The primary objective of this research is to obtain fundamental knowledge
concerning the surface properties of coal pyrite as they relate to advanced
physical coal cleaning (APCC) processes. This goal will be achieved through a
two-part program: (1) investigating the mechanisms responsible for the
inefficient rejection of coal pyrite and (2) developing schemes for improving
the rejection of coal pyrite based on information gathered from part (1).
The objectives of the research conducted during this reporting period
were to determine the following: (1) the influence of commonly used flotation
surfactants (i.e., frother and kerosene) on the hydrophobicity of coal and
mineral pyrite samples as a function of pH, (2) the correlation between the
observed hydrophobicity and changes in sample morphology using scanning
electron microscopy (SEM), (3) the reduction/oxidation properties of the coal
and mineral pyrite samples as a function of pH, and (4) the effect of
controlled surface oxidation as a possible pyrite rejection scheme in
microbubble column flotation.
EXPERIMENTAL PROCEDURE
Materials
An additional coal pyrite sample from the Pittsburgh No. 8 seam
(Pennsylvania) was obtained in massive crystalline and run-of-mine (-6mm)
form. The sample preparation for the hydrophobicity measurements was
identical to the procedure outlined in the last quarterly report.
Induction Time and Microflotation
Th, induction time and microflotation measurements were conducted in
similar fashion to those described in the previous report. The flotation
surfactants used in these studies were Dowfroth 1012 and kerosene.2
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Luttrell, G. H.; Yoon, R. H.; Zachwieja, J. & Lagno, M. Control of pyrite surface chemistry in physical coal cleaning. Second quarterly progress report, December 1, 1989--February 28, 1990, report, June 24, 1992; Blacksburg, Virginia. (https://digital.library.unt.edu/ark:/67531/metadc1319602/m1/3/: accessed June 3, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.