Community Research and Development Information Service - CORDIS


Final report on Contract no 7215-PP/001, 1 July 19987 to 31 December 2000

By different grinding methods, haematite and magnetite were ground to palletising fineness for balling and induration test work. The specific energy consumptions for ball mill and roller press grinding were recorded and the differences in particle size distribution and shape were evaluated. The pellets produced after roller press grinding resulted in improvement of the tumble abrasion and disintegration. The same is not noticed for magnetite, due to non-satisfactory oxidation during preheating.

In order to understand the mechanisms in palletising more fundamentally, new techniques have been developed, like PaRMAC for sizing of the material. Thermogravimetric (TGA) methods and Raman microprobe have successfully been used to study the dependence of particle size, surface reactivity and mineral phases on pellet quality.

The relationship between green pellet qualities, induration, cold compression strength (CCS) and metallurgical quality has been established.

There are today two mathematical models, at LKAB and Corus, describing the induration process. They have, within this project, been improved and validated against plant data and pot furnace tests. An online dynamic model for LKAB's pellet plants has been developed by CISA. The evaluation shows that it generates useful non-measurable information in real time, including cold compression strength, oxidation rates and temperature, profiled throughout the process.

Additional information

Authors: SAMSKOG P-O, LKAB, Kiruna (SE);BROUSSARD A, CISA Orléans (FR);CHAIGNEAU R, Hoogovens, IJmuiden (NL);MERTINS E, SGA, Liebenburg (DE);FORSSBERG E, Luleå University of Technology, Luleå (SE)
Bibliographic Reference: EUR 20291 EN (2002), pp.168. Euro: 25.00
Availability: EUR-OP reference: KI-NA-20291-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-3465-1
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