Process for the production of a wear lining from a...

B - Operations – Transporting – 22 – D

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B22D 41/02 (2006.01) F27D 1/10 (2006.01) F27D 1/16 (2006.01)

Patent

CA 2626306

The present invention relates to a process for making a wear lining for casting ladles and pouring boxes used in foundries, in which process the wear lining is formed by introducing into a casting ladle or pouring box a pourable mass consisting of a granular or particulate refractory material that has a low heat conductivity and contains at least 4 wt-% of sodium silicate or potassium silicate and which binds together to form a solid mass in situ by means of a silica- containing gel precipitated from the silicate by the addition of a suitable ester or mixture of esters, optionally combined with the introduction of carbon dioxide. The invention also relates to a process for increasing the service life of the wear lining made in this way by adapting its MgO content according to whether it - the lining - comes into contact mainly with molten metal or molten slag.

La présente invention concerne un procédé servant à fabriquer un revêtement d'usure pour des poches de coulée et des bassins de coulée utilisés dans des fonderies, lequel procédé consiste à former le revêtement d'usure en introduisant dans une poche de coulée ou un bassin de coulée une masse pouvant couler constituée d'une matière réfractaire granulaire ou particulaire qui a une faible conductivité thermique et contient au moins 4 % en poids de silicate de sodium ou de silicate de potassium et qui se lie pour former une masse solide in situ au moyen d'un gel contenant de la silice précipité à partir du silicate par l'ajout d'un ester ou mélange d'esters approprié, éventuellement conjointement avec l'introduction de dioxyde de carbone. L'invention concerne également un procédé servant à accroître la durée de vie du revêtement d'usure fabriqué de cette manière en adaptant sa teneur en MgO selon que le revêtement est en contact principalement avec du métal en fusion ou avec du laitier en fusion.

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