Reductive behaviour of the recycled dust during nickeliferous laterite treatment [Das Reduzierende Verhalten des Recycelten Staubs Während der Verarbeitung bon Feni-lateriten]

Zevgolis, E; Halikia, I; Kostika, I-P

dc.contributor.author	Zevgolis, E	en
dc.contributor.author	Halikia, I	en
dc.contributor.author	Kostika, I-P	en
dc.date.accessioned	2014-03-01T01:55:27Z
dc.date.available	2014-03-01T01:55:27Z
dc.date.issued	2006	en
dc.identifier.issn	16132394	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/27741
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-33846386003&partnerID=40&md5=6e482b9415ecc79c842e7d6a616a4fa1	en
dc.subject	Laterite reduction	en
dc.subject	Nickeliferous dust	en
dc.subject	Reduction kinetics	en
dc.subject.other	Activation energy	en
dc.subject.other	Nickel compounds	en
dc.subject.other	Recycling	en
dc.subject.other	Rotary kilns	en
dc.subject.other	Laterite reduction	en
dc.subject.other	Nickeliferous dust	en
dc.subject.other	Reduction kinetics	en
dc.subject.other	Dust	en
dc.title	Reductive behaviour of the recycled dust during nickeliferous laterite treatment [Das Reduzierende Verhalten des Recycelten Staubs Während der Verarbeitung bon Feni-lateriten]	en
heal.type	journalArticle	en
heal.publicationDate	2006	en
heal.abstract	In the present study, the reductive behavior of nickeliferous dust from rotary kilns, during Greek laterite treatment in ferronickel production is investigated. The study concerns dust of various origins, i.e. washing towers, electrostatic filters and polycyclones. Laboratory made pellets from these dusts were also examined. Reducibility was studied in the temperature range of 700°C to 850°C in a laboratory tube furnace. Experimental results showed that the reduction degree reaches maximum values of 28% and 26% percentage for dusts and pellets respectively within the first twenty minutes of the process, and then reaction tends to equilibrium for all cases examined. The rate of reduction increases significantly during the first ten minutes of reaction and then it becomes lower until it diminishes to zero after twenty minutes of roasting. Temperature favors the reduction process, the reduction percentage being increased as a function of temperature up to about 800°C. Rates and reduction degrees are higher for the dusts than for the corresponding pellets, for all experimental conditions examined. Kinetic analysis of the results showed that at low temperature values the mixed kinetic model verifies the experimental results of dust and pellet samples. At higher temperatures (800°C and 850°C), diffusion becomes the rate determining step. The change in the controlling mechanism is attributed to the formation of silicate compounds around the grains as temperature rises. The calculated activation energy values verify the above mentioned results.	en
heal.journalName	World of Metallurgy - ERZMETALL	en
dc.identifier.volume	59	en
dc.identifier.issue	6	en
dc.identifier.spage	350	en
dc.identifier.epage	359	en