EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

The slagdoor is the part of the electric furnace for the slag bleeding occurs. This door is closed by a metal door that rises at the time of casting slag, dropping back to its initial position to continue the process of steelmaking. During the casting, the erosion or attrition of the refractories lining that cover the sidewalls of the furnace takes places, so it is necessary to apply a material which allows that useful life of those refractories is extended at the same time that protect the electrodes and facilitate the clean of the slag residues. The protection of the slagdoor comprises several parts: protecting the refractory lining, the electrode and facilities cleaning of slag. PASEK Dunite is an ultramaphic rock exploited in the north of Spain with a basic chemical classification, being olivine and serpentine its principal minerals. As a result of its composition, its physical and mechanical properties and availability of different grain sizes according to customer requirements, PASEK Dunite is a suitable material to protect the slagdoor during the casting. The main products for this applications are magnesium derivatives as magnesite and dolomite, besides the use of Dunite has several advantages such improving the clean os slagdoor, lower cost of acquisition and No CO2 emissions. On the other hand, the same product could be used as ramming mix in combination with magnesite mixes, to protect the refractory lining of EAF hearth line. In this case, is possible to have a tailor made heart lining changing thickness, thermal conductivity and compression strength of final lining. Keywords: Slagdoor; Heart lining, EAF; Dunite; magnesium silicate, runner patch