Affiliation:
1. Universidade do Extremo Sul Catarinense – UNESC
Abstract
The aim of this work was the obtaining coarse aggregate from red mud (RM) focused on the processing properties. RM and two clays (A and B) were selected from Pará state (Brazil) and characterized by XRD, XRF and HSM. Six compositions were planned by mixture design. RM amount varied from 80 to 100wt%. Compositions were pelletized in a pelletizer disc, resulting test pieces of 4 to 19 mm (diameter). Firing temperatures ranged from 1150 to 1190 oC and holding time from 15 to 90 min. Pelletizing humidity, dry friability, water absorption, and apparent density were determined. Clays A and B presented clay mineral content about 67 and 12 wt%, quartz 25 and 82wt%, respectively. The higher clay mineral contents the smaller dry friability and water absorption. Appropriated clay mineral contents and firing parameters is needed in order to satisfy processing and final properties requirements, being possible to obtain aggregates from pelletizing process.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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