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DOI	10.2172/10182737
Title	Pelletization of fine coals. Technical progress report, March 1, 1992--May 31, 1992
Creator/Author	Sastry, K.V.S.
Publication Date	1992 Sep 01
OSTI Identifier	OSTI ID: 10182737; Legacy ID: DE92040533
Report Number(s)	DOE/PC/89766--T8
DOE Contract Number	FG22-89PC89766
DOI	10.2172/10182737
Other Number(s)	Other: ON: DE92040533
Resource Type	Technical Report
Specific Type	Numerical Data; Progress Report
Resource Relation	Other Information: PBD: [1992]
Coverage	Quarterly
Research Org	California Univ., Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering
Sponsoring Org	USDOE, Washington, DC (United States)
Subject	01 COAL, LIGNITE, AND PEAT; COAL FINES; PELLETIZING; PROGRESS REPORT; NUMERICAL DATA; COMPRESSION STRENGTH
Description/Abstract	The first step consisted of producing a batch of seed pellets (in the size range {minus}4.75+4.00 mm) by pelletizing of 200 g of ground coal with desired additives (surface active agents and binders) and moisture content for 800 revolutions. The seed pellets are obtained by sieving the output from the batch drum. The second step involved the production of finished size pellets by layering the seed pellets with stepwise addition of moist feed which is again produced with desired additives and moisture content. Specifically, 25 g of the {minus}4.75+4.00 mm seed pellets are placed in the drum and 20 g of moist fluffy feed is added every 80 revolutions for five times. After 400 revolutions the pellets are sieved on the 4.75 mm screen and the screen undersize which corresponds to new seeds generated during the layering cycles is discarded. Now, 30 g of moist fluffy feed is added every 50 revolutions for five more cycles. These layered pellets are sieved again and the {minus}9.5+8.00 mm pellets. Coal agglomerates produced by the above described technique are nice and spherical. With our past experience with iron ore pelletization we learnt that as long as sufficient fluffy feed is available for the consumption by the seed pellets, they generally grow by forming layers consuming the feed rather than grow by coalescence. This is found to be true in the case of coal also. Growth by coalescence of coal pellets is found to yield raspberry type uneven agglomerates. After ascertaining the possibility of producing nice spherical pellets, several experiments have been conducted to develop the above standard procedure for making pellets in a reproducible way and testing them for their quality.
Country of Publication	United States
Language	English
Format	Size: 3 p.
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System Entry Date	2007 May 14
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