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Title: Dewatering studies of fine clean coal

Abstract

The main objective of the present research program is to study and understand dewatering characteristics of ultrafine clean coal obtained using the advanced column flotation technique from the Kerr-McGee's Galatia preparation plant fine coal waste stream. It is also the objective of the research program to utilize the basic study results, i.e., surface chemical, particle shape particle size distribution, etc., in developing a cost-effective dewatering method. The ultimate objective is to develop process criteria to obtain a dewatered clean coal product containing less that 20 percent moisture, using the conventional vacuum dewatering equipment. (VC)

Authors:
Publication Date:
Research Org.:
Illinois Dept. of Energy and Natural Resources, Springfield, IL (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
5987026
Report Number(s):
DOE/PC/90176-T49
ON: DE92004185
DOE Contract Number:
FG22-90PC90176
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL FINES; FLOTATION; WATER REMOVAL; IONS; METALS; MOISTURE; PARTICLE SIZE; PROGRESS REPORT; SURFACE PROPERTIES; SURFACTANTS; CHARGED PARTICLES; DOCUMENT TYPES; ELEMENTS; REMOVAL; SEPARATION PROCESSES; SIZE; 010300* - Coal, Lignite, & Peat- Preparation- (1987-)

Citation Formats

Parekh, B.K.. Dewatering studies of fine clean coal. United States: N. p., 1991. Web. doi:10.2172/5987026.
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Parekh, B.K.. Dewatering studies of fine clean coal. United States. doi:10.2172/5987026.
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Parekh, B.K.. Tue . "Dewatering studies of fine clean coal". United States. doi:10.2172/5987026. https://www.osti.gov/servlets/purl/5987026.
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@article{osti_5987026,
title = {Dewatering studies of fine clean coal},
author = {Parekh, B.K.},
abstractNote = {The main objective of the present research program is to study and understand dewatering characteristics of ultrafine clean coal obtained using the advanced column flotation technique from the Kerr-McGee's Galatia preparation plant fine coal waste stream. It is also the objective of the research program to utilize the basic study results, i.e., surface chemical, particle shape particle size distribution, etc., in developing a cost-effective dewatering method. The ultimate objective is to develop process criteria to obtain a dewatered clean coal product containing less that 20 percent moisture, using the conventional vacuum dewatering equipment. (VC)},
doi = {10.2172/5987026},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}
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Technical Report:
View Technical Report (1.31 MB)
DOI:  10.2172/5987026
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  • Physical cleaning of ultra-fine coal using advanced froth flotation technique provides a low ash product, however, the amount of water associated with clean coal is high. Economic removal of water from the froth will be important for commercial applicability of the advanced flotation processes. The main objective of the present research program is to study and understand dewatering characteristics of ultra-fine clean coal and to develop process parameters to effectively reduce the moisture to less than 20 percent in the clean coal product. The research approach under investigation utilizes synergistic effect of metal ions and surfactant to lower the moisturemore » of clean coal using conventional vacuum dewatering technique. During this contract period adsorption studies of anionic, non-ionic and cationic surfactants onto the clean coal were conducted. No significant moisture reduction was observed with any of the surfactant. However, a mixture of the cationic (cetyl pyridinium chloride) surfactant and aluminium metal ions provided a filter cake containing about 22 percent moisture. Morphology studies of filter cake obtained without addition of reagents showed gradation of void fraction in filter cake, which decreased from top to the bottom layer of the cake. Efforts are in progress to optimize dosages of surfactant-metal ion system to lower moisture to less than 20 percent. Additional studies on morphology of the filter cake will also be conducted. 12 figs., 2 tabs.« less

  • The main objective of the present research program is to study and understand dewatering characteristics of ultra-fine clean coal and to develop process parameters to effectively reduce the moisture to less than 20 percent in the clean coal product. The research approach under investigation utilizes synergistic effect of metal ions and surfactant to lower the moisture of clean coal using conventional vacuum dewatering technique. During this contract period adsorption of di-, tri-, and tetra-valent metal ions, and octadecylamine onto the clean coal was studied. The adsorption of divalent copper ions provided three charge reversal points (or zero-point-of-charges) for the cleanmore » coal. The lowest amount of moisture in the filter cake was obtained near the two charge reversal points of the copper-coal system. For the tri-valent aluminum ions and tetra-valent titanium ions one charge reversal, at pH 8.0 and pH 5.0 was observed, respectively. The moisture in the filter cake was lowest near the zero point of charge (ZPC) or both the metal ions. Adsorption of octadecylamine onto the coal provided one ZPC at pH {approximately}7. 0. However, moisture content of the filter cake was not significantly lowered at this pH Morphology of the filter cake obtained without the addition of metal ions or surfactant, showed segregation of large particle at the bottom of filter cake. Efforts are in progress to determine effect of combining metal ions and various (nonionic and anionic) surfactant on filtration, and utilizing a better approach to study the in-situ morphology of the filter cake. 13 figs.« less

  • Physical cleaning of ultra-fine coal using an advanced froth flotation technique provides a low ash product, however, the amount of water associated with clean coal is high. Economic removal of water from the froth will be important for commercial applicability of advanced froth flotation processes. The main objective of the present research program is to study and understand the dewatering characteristics of ultra-fine clean coal and to develop the process parameters to effectively reduce the moisture to less than 20 percent in the clean coal product. The research approach under investigation utilizes synergistic effects of metal ions and surfactant tomore » lower the moisture of clean coal using a conventional vacuum dewatering technique. During the last year's effort, it was reported that a combination of metal ion and surfactant provided a 22 percent moisture filter cake.« less

  • Physical cleaning of ultra-fine coal using advanced froth flotation technique provides a low ash product; however, the amount of water associated with clean coal is high. Economic removal of water from the froth will be important for commercial applicability of the novel processes. The main objective of the present research program is to study and understand dewatering characteristics of ultra-fine clean coal and to develop process parameters to effectively reduce the moisture to less than 20 percent in the clean coal product. The research approach utilizes synergistic effect of metal ions and surfactant to lower the moisture of clean coalmore » using conventional vacuum dewatering technique. During this contract period clean coal product obtained using the advanced Ken-Flote column was characterized. The average particle size of the clean coal was 21 microns and contained about 8 percent ash. The electrokinetic studies conducted on the coal before and after flotation shows a strong adsorption of fuel oil on the coal surface. Adsorption of Cu(II) metal ions and a cationic surfactant lowered the zeta potential to zero, depending on the pH of the suspension. Dewatering of clean coal froth without addition of any reagent provided 35 percent moisture cake; addition of 2.5 lb/ton of fuel oil reduced moisture to 30 percent. Efforts are in progress to understand adsorption phenomena of the reagents, contact angle studies and micrographic analysis of the filter cake. From these data, optimum process conditions will be identified to obtain a filter cake containing less than 20 percent moisture. 10 figs., 1 tab.« less

  • The main objective of the present research program is to study and understand dewatering characteristics of ultrafine clean coal obtained using the advanced column flotation technique from the Kerr-McGee`s Galatia preparation plant fine coal waste stream. It is also the objective of the research program to utilize the basic study results, i.e., surface chemical, particle shape particle size distribution, etc., in developing a cost-effective dewatering method. The ultimate objective is to develop process criteria to obtain a dewatered clean coal product containing less that 20 percent moisture, using the conventional vacuum dewatering equipment. (VC)