Residual diesel range organics in process waters from laboratory fine coal flotation tests.

Laboratory flotation tests were conducted on three bituminous high-rank coal samples - two from direct flotation feeds and one from run-of-mine material - in a Denver cell using petro-diesel collector dosages of 0-1 000 g/t and a methyl isobutyl carbinol frother (10 ppm). Total diesel-range organics and specific polycyclic aromatic hydrocarbon contents were determined in process waters associated with concentrate and tailing streams. The results indicated that concentrate waters contained larger quantities of diesel-range organics than tailing waters and that diesel-range organic contents in both streams increased with increasing diesel dosage. Total diesel-range organic contents are limited to the water-soluble fraction, and residual polycyclic aromatic hydrocarbons in the process waters partition proportionately with total diesel-range organic content. Six naphthalene compounds, but no phenanthrene, were detected in the concentrate and tailing water samples resulting from the flotation tests and, in general, polycyclic aromatic hydrocarbons were found to be present at higher levels in concentrate samples than tailing samples.
Laboratory flotation tests were conducted on three bituminous high-rank coal samples - two from direct flotation feeds and one from run-of-mine material - in a Denver cell using petro-diesel collector dosages of 0-1 000 g/t and a methyl isobutyl carbinol frother (10 ppm). Total diesel-range organics and specific polycyclic aromatic hydrocarbon contents were determined in process waters associated with concentrate and tailing streams. The results indicated that concentrate waters contained larger quantities of diesel-range organics than tailing waters and that diesel-range organic contents in both streams increased with increasing diesel dosage. Total diesel-range organic contents are limited to the water-soluble fraction, and residual polycyclic aromatic hydrocarbons in the process waters partition proportionately with total diesel-range organic content. Six naphthalene compounds, but no phenanthrene, were detected in the concentrate and tailing water samples resulting from the flotation tests and, in general, polycyclic aromatic hydrocarbons were found to be present at higher levels in concentrate samples than tailing samples.