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Title: High-carbon fly-ash as a binder for iron ore pellets

Abstract

The goal of this project was to convert currently unusable fly-ashes into a material that can be used as a binder for iron ore. Such a binder would also be useful for other high-volume markets, including foundry sand mold binders. Previously, the investigators used fly-ash in combination with calcium hydroxide as an additive while calcium chloride was added as a hardening accelerator. However, the addition of chloride salts have a detrimental effect because chlorine causes corrosion in processing equipment. Therefore, other potential hardening accelerators were investigated during this project. During production, dried iron-ore pellets are required to have crushing strength of at least 22.2 newtons (5 pounds force) per 12.7 mm (1/2 inch) diameter pellet. The pellets are then sintered at temperatures up to 1300 C and must not exhibit a significant degree of spalling or cracking. Pellets will therefore be tested to determine whether acceptable dry crushing strengths can be achieved.

Authors:
; ; ;
Publication Date:
Research Org.:
Federal Energy Technology Center, Morgantown, WV (US); Federal Energy Technology Center, Pittsburgh, PA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
781805
Report Number(s):
DE-FG26-97FT97271-01
TRN: AH200123%%428
DOE Contract Number:  
FG26-97FT97271
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; WASTE PRODUCT UTILIZATION; ADDITIVES; BINDERS; CALCIUM CHLORIDES; CALCIUM HYDROXIDES; CORROSION; FLY ASH; HARDENING; IRON ORES; COMPRESSION STRENGTH

Citation Formats

Kawatra, S.K., Eisele, T.C., Ripke, S.J., and Ramirez, G. High-carbon fly-ash as a binder for iron ore pellets. United States: N. p., 1999. Web. doi:10.2172/781805.
Kawatra, S.K., Eisele, T.C., Ripke, S.J., & Ramirez, G. High-carbon fly-ash as a binder for iron ore pellets. United States. doi:10.2172/781805.
Kawatra, S.K., Eisele, T.C., Ripke, S.J., and Ramirez, G. Wed . "High-carbon fly-ash as a binder for iron ore pellets". United States. doi:10.2172/781805. https://www.osti.gov/servlets/purl/781805.
@article{osti_781805,
title = {High-carbon fly-ash as a binder for iron ore pellets},
author = {Kawatra, S.K. and Eisele, T.C. and Ripke, S.J. and Ramirez, G.},
abstractNote = {The goal of this project was to convert currently unusable fly-ashes into a material that can be used as a binder for iron ore. Such a binder would also be useful for other high-volume markets, including foundry sand mold binders. Previously, the investigators used fly-ash in combination with calcium hydroxide as an additive while calcium chloride was added as a hardening accelerator. However, the addition of chloride salts have a detrimental effect because chlorine causes corrosion in processing equipment. Therefore, other potential hardening accelerators were investigated during this project. During production, dried iron-ore pellets are required to have crushing strength of at least 22.2 newtons (5 pounds force) per 12.7 mm (1/2 inch) diameter pellet. The pellets are then sintered at temperatures up to 1300 C and must not exhibit a significant degree of spalling or cracking. Pellets will therefore be tested to determine whether acceptable dry crushing strengths can be achieved.},
doi = {10.2172/781805},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}