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High Strength Iron Oxide Pellets by Polymer Impregnation.

Nigro JC; Prasky C
Proc 12th Biennal Conf Inst for Briquetting and Aggl 1971 Aug; 12:125-144
A laboratory research program was initiated to determine the technical feasibility of utilizing organic polymers as binding materials for iron oxide pellets. Predried magnetite and hematite pellets impregnated with low-viscosity vinyl liquid monomers and polymerized in situ by thermal-catalytic techniques yielded compressive strengths equivalent to those reported by high- temperature induration plants. One-half-inch-diameter magnetite pellets containing less than 5 wt-pct poly(methyl methacrylate) gave compressive strengths in excess of 500 lb after polymerization at 80 deg c (176 deg f) and annealing at 200 deg c (392 deg f). Somewhat lower pellet strengths were obtained with methyl methacrylate- styrene and styrene-acrylonitrile copolymers. Polymer impregnation of both heat-hardened and cement-bonded pellets resulted in exceptionally high compressive strengths. The compressive strength of partially oxidized magnetite pellets (500 deg c (932 deg f) increased from about 100 lb to over 1,000 lb after impregnation with less than 5 wt-pct poly(methyl methacrylate). Similar strength increases were obtained after impregnation of green magnetite pellets containing from 2.5 to 5.0 pct portland cement binder.
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OP 61-73
NIOSH Division
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Proc. 12th Biennal Conf. Inst. for Briquetting and Aggl., V. 12, August 1971, PP. 125-144
Page last reviewed: October 8, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division