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Title: Surface properties of coal and their role in coal beneficiation: Technical progress report, March 15, 1989--June 14, 1989

Abstract

The main goal of this research is to delineate the wetting behavior of coal and its subsequent effects on fine coal processing. As both bulk and surface properties of coal are interrelated and have a controlling role in the performance of these processes, a detailed study has been undertaken to correlate their influence on both wetting behavior and the response of coal to flotation. During this current reporting period, the major effort was directed towards investigation of the effect of pH and oxidation on the induction time of coal.

Authors:
Publication Date:
Research Org.:
California Univ., Berkeley (USA). Coll. of Engineering
OSTI Identifier:
6244095
Report Number(s):
DOE/PC/90507-T11
ON: DE89014166
DOE Contract Number:
FG22-86PC90507
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; WETTABILITY; FLOTATION; OXIDATION; PH VALUE; PROGRESS REPORT; SURFACE PROPERTIES; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; DOCUMENT TYPES; ENERGY SOURCES; FOSSIL FUELS; FUELS; MATERIALS; SEPARATION PROCESSES; 010600* - Coal, Lignite, & Peat- Properties & Composition

Citation Formats

Fuerstenau, D.W.. Surface properties of coal and their role in coal beneficiation: Technical progress report, March 15, 1989--June 14, 1989. United States: N. p., 1989. Web. doi:10.2172/6244095.
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Fuerstenau, D.W.. Surface properties of coal and their role in coal beneficiation: Technical progress report, March 15, 1989--June 14, 1989. United States. doi:10.2172/6244095.
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Fuerstenau, D.W.. Sat . "Surface properties of coal and their role in coal beneficiation: Technical progress report, March 15, 1989--June 14, 1989". United States. doi:10.2172/6244095. https://www.osti.gov/servlets/purl/6244095.
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@article{osti_6244095,
title = {Surface properties of coal and their role in coal beneficiation: Technical progress report, March 15, 1989--June 14, 1989},
author = {Fuerstenau, D.W.},
abstractNote = {The main goal of this research is to delineate the wetting behavior of coal and its subsequent effects on fine coal processing. As both bulk and surface properties of coal are interrelated and have a controlling role in the performance of these processes, a detailed study has been undertaken to correlate their influence on both wetting behavior and the response of coal to flotation. During this current reporting period, the major effort was directed towards investigation of the effect of pH and oxidation on the induction time of coal.},
doi = {10.2172/6244095},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 1989},
month = {Sat Jul 01 00:00:00 EDT 1989}
}
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Technical Report:
View Technical Report (0.39 MB)
DOI:  10.2172/6244095
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  • The main goal of this research is to delineate the wetting behavior of coal and it subsequent effects on fine coal processing. As both bulk and surface properties of coal are interrelated and have a controlling role on the performance of these processes, a detailed study has been undertaken to correlate their influence on both wetting behavior and the response of coal to flotation and other unit operations encountered in fine coal processing. During the last quarter, the effect of coal rank on water retention capacity was investigated. The effect of pH on the vacuum flotation yield and the effectmore » of desliming on the film flotation response of coal were also studied. 6 refs., 5 figs.« less

  • The main goal of this research is to delineate the wetting behavior of coal and its subsequent effects on fine coal processing. As both bulk and surface properties of coal are interrelated and have a controlling role on the performance of these processes, a detailed study has been undertaken to correlate their influence on both wetting behavior and the response of coal to flotation and other unit operations encountered in fine coal processing. During the past quarter, the effect of oxidation on dewatering of fine coal was studied. The water content of filter cake of as-received and oxidized Cambria No.more » 78 and New Zealand coals was correlated with their mean critical wetting surface tension, total oxygen content, and oxygen functional group concentration. 10 refs., 10 figs., 1 tab.« less

  • The main focus of the research is to delineate the wetting characteristics of coal in relation to fine coal processing. As both bulk and surface properties are interrelated and have a controlling role on the performance of these processes, a detailed study was undertaken to correlate their influence on the wetting behavior and response of coal to flotation. In the previous quarterly report, the results of preliminary studies on the effect of temperature and time of oxidation on the film flotation response of two coal samples, namely Cambria No. 78 (Pennsylvania low-volatile bituminous) and Dave Johnston (a Wyoming subbituminous) wasmore » discussed. Because of the generation of oxygenated functional groups, the coal surface is rendered more hydrophilic as the temperature or the time of oxidation was increased. Research work during the past quarter involved continued characterization of the coals subjected to various degrees of thermal oxidation. The mean wetting tension, as obtained from film flotation experiments, of a number of as-received and oxidized coals of different ranks was correlated with the oxidation temperature and the oxygen content. In addition, the susceptibility to oxidation of the fifteen different coals which had been studied previously was also quantified in terms of oxygen uptake. The results are analyzed in terms of coal carbon content, oxygen content and response to vacuum flotation in salt solution. 8 refs., 12 figs., 2 tabs.« less

  • This ongoing investigation of the surface properties of coal has been aimed at delineating interfacial phenomena related to the flotation cleaning of coal. The major concern of this research has been the investigation of the effects of oxidation on wetting and dewetting phenomena of coal in relation to coal beneficiation. This report details the results from a quantitative FTIR study of the air-oxidation of coal both as a function of oxidation time and oxidation temperature. The results from continued induction time studies and their comparison with film flotation in estimating the critical surface wetting tension are also presented. 8 figs.

  • The objective of this research program is to delineate the wetting characteristics of coal particles and to relate them to fine coal processing techniques. As both bulk and surface properties of coal are interrelated and have a controlling role on the performance of these processes, a detailed study was undertaken to correlate their influence on both the wetting behavior and response of coal to flotation. In the previous quarterly report, the effect of oxidation temperature on the wettability of different rank coals was discussed. The mean critical wetting surface tension, anti ..gamma../sub c/, obtained from film flotation experiments of as-receivedmore » and oxidized coals was correlated with the oxidation temperature and the oxygen content. It was found that anti ..gamma..,/sub c/ and oxygen content of all coals increase with the increase of oxidation temperature, indicating that coals are more hydrophilic as they become more oxidized and the oxygen uptake by the coals during oxidation is the main reason for the increase in hydrophilicity. Moreover, the results also show that the lower rank coals are more susceptible to oxidation than such high rank coals as anthracite. Research work during the past quarter involved continued characterization of bituminous coals subjected to various periods and degrees of thermal oxidation. The anti ..gamma../sub c/ values for these coals, as obtained from film flotation experiments, were correlated with the oxidation time and oxygen content. A mathematical model of coal oxidation was developed and it was used to analyze the kinetics of coal oxidation. The experimental results were found to agree reasonably well with the mathematical model. Preliminary induction time measurements are presented in this report. 14 refs., 9 figs.« less