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Title: Flotation and flocculation chemistry of coal and oxidized coals

Abstract

This project is designed to develop an understanding of the fundamentals involved in flotation and flocculation of coal, and of coal in various states of oxidation. The main objective of this study is to accurately characterize the coal surface and elucidate mechanisms by which surface interactions between coal and various reagents enhance beneficiation of coals. Effects of oxidation on the modification of surface characteristics of coal by various reagents will also be studied. This quarter, the following studies were conducted in order to further develop our understanding of the role of heterogeneity in interfacial phenomena. (1) Since surface characterization is an important aspect in this project, ESCA (Electron Spectroscopy for Chemical Analysis) study of the coal surface was conducted. Surface derivatization, a technique often used in the preparation of organic compounds for gas-liquid chromatography, uses site specific molecular tags'' that bond to key chemical groups on the surface. Application of derivatization in conjunction with ESCA is a relatively new technique for quantifying functional groups on the surface which has not been possible till now. (2) A distribution of contact angles on the surface of coal (pseudo theta map) is presented based on our earlier results and other published information. Themore » role of heterogeneity in contact angle studies is also examined. 14 refs., 2 tabs.« less

Authors:
;
Publication Date:
Research Org.:
Columbia Univ., New York, NY (USA)
Sponsoring Org.:
DOE/FE
OSTI Identifier:
5632118
Report Number(s):
DOE/PC/79919-9
ON: DE90001034
DOE Contract Number:  
FG22-87PC79919
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; SURFACE PROPERTIES; DERIVATIZATION; FLOCCULATION; FLOTATION; HETEROGENEOUS EFFECTS; INTERFACES; MODIFICATIONS; OXIDATION; PROGRESS REPORT; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; DOCUMENT TYPES; ENERGY SOURCES; FOSSIL FUELS; FUELS; MATERIALS; PRECIPITATION; SEPARATION PROCESSES; 010600* - Coal, Lignite, & Peat- Properties & Composition; 010300 - Coal, Lignite, & Peat- Preparation- (1987-)

Citation Formats

Somasundaran, P., and Ramesh, R.. Flotation and flocculation chemistry of coal and oxidized coals. United States: N. p., 1989. Web. doi:10.2172/5632118.
Somasundaran, P., & Ramesh, R.. Flotation and flocculation chemistry of coal and oxidized coals. United States. https://doi.org/10.2172/5632118
Somasundaran, P., and Ramesh, R.. Sun . "Flotation and flocculation chemistry of coal and oxidized coals". United States. https://doi.org/10.2172/5632118. https://www.osti.gov/servlets/purl/5632118.
@article{osti_5632118,
title = {Flotation and flocculation chemistry of coal and oxidized coals},
author = {Somasundaran, P. and Ramesh, R.},
abstractNote = {This project is designed to develop an understanding of the fundamentals involved in flotation and flocculation of coal, and of coal in various states of oxidation. The main objective of this study is to accurately characterize the coal surface and elucidate mechanisms by which surface interactions between coal and various reagents enhance beneficiation of coals. Effects of oxidation on the modification of surface characteristics of coal by various reagents will also be studied. This quarter, the following studies were conducted in order to further develop our understanding of the role of heterogeneity in interfacial phenomena. (1) Since surface characterization is an important aspect in this project, ESCA (Electron Spectroscopy for Chemical Analysis) study of the coal surface was conducted. Surface derivatization, a technique often used in the preparation of organic compounds for gas-liquid chromatography, uses site specific molecular tags'' that bond to key chemical groups on the surface. Application of derivatization in conjunction with ESCA is a relatively new technique for quantifying functional groups on the surface which has not been possible till now. (2) A distribution of contact angles on the surface of coal (pseudo theta map) is presented based on our earlier results and other published information. The role of heterogeneity in contact angle studies is also examined. 14 refs., 2 tabs.},
doi = {10.2172/5632118},
url = {https://www.osti.gov/biblio/5632118}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}