Bonded medium

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 7/02 (2006.01) C22B 1/14 (2006.01) C22B 1/244 (2006.01)

Patent

CA 2200333

Thermally shock stable bonded solid materials are formed by mixing a solid mineral or inorganic material in an aqueous medium with a lignosulfonate, treating the aqueous medium with a metal ion-based complexing agent (such as lime), with application of heat sufficient to maintain the lignosulfonate in fluid form, so as to produce an intimate mix of saturated slaked lime with lignosulfonate and the mineral or inorganic material, and thoroughly mixing the resulting substantially dry material with dry urea (or a derivative thereof) so as to cause the mix to agglomerate, preferably followed by shaping the agglomerates by briquetting or the like.

L'invention concerne des matières solides agglomérées, thermostables, que l'on produit en mélangeant dans un milieu aqueux un minéral solide ou une matière inorganique avec du lignosulfonate, puis en traitant ce milieu avec un agent complexant à base d'ions métalliques (de la chaux, par exemple), avec un apport de chaleur suffisant pour conserver au lignosulfonate sa forme liquide, ce qui permet de mélanger parfaitement la chaux éteinte saturée avec le lignosulfonate et le minéral ou la matière inorganique. Une fois pratiquement sèche, la matière ainsi obtenue est mélangée intimement avec de l'urée sèche (ou un dérivé) de façon à ce que le mélange s'agglomère. Le produit aggloméré ainsi obtenu est, ensuite, de préférence, mis sous forme de briquettes ou d'éléments analogues.

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