Porous agglomerates containing iron and at least one further...

C - Chemistry – Metallurgy – 21 – C

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C21C 7/00 (2006.01) B22F 9/20 (2006.01) C21C 5/52 (2006.01) C22B 1/24 (2006.01) C22C 33/02 (2006.01) C22C 35/00 (2006.01) C22C 38/04 (2006.01) C22C 38/12 (2006.01) C22C 38/22 (2006.01) C22C 38/24 (2006.01) C22C 38/44 (2006.01)

Patent

CA 2397524

The invention relates to agglomerates containing iron and at least one other element from groups 5 or 6 of the periodic table, in particular, molybdenum or tungsten. The invention is characterised in that said agglomerates have a porosity in the range from 20 to 65 vol %, in particular, from 30 to 45 vol %. A rapid dissolution in a metal melt is thus achieved. According to the invention, the agglomerates, in particular, contain molybdenum as the further element, preferably in an amount in the range of 60 to 80 wt. %. The particle density of said agglomerates is preferably 4.2 to 6.3 g/cm3. Said agglomerates are produced by reduction of a mixture of iron oxide and molybdenum, whereby the reduced metal is formed into briquettes without the addition of any binders and the Fe-Mo product in briquette form is then sintered.

L'invention concerne des agglomérats contenant du fer et au moins un autre élément des groupes 5 ou 6 de la classification périodique des éléments, en particulier du molybdène ou du tungstène. Ces agglomérats se caractérisent en ce qu'ils présentent une porosité comprise dans la plage 20 à 65 % en volume, en particulier 30 à 45 % en volume. Grâce à cette porosité, les agglomérats se dissolvent rapidement dans du métal en fusion. Les agglomérats selon l'invention contiennent, comme autre élément, en particulier du molybdène en une proportion qui est de préférence de 60 à 80 % en poids. La masse volumique de ces agglomérats est de préférence de 4,2 à 6,3 g/cm?3¿. Ces agglomérats sont produits par réduction d'un mélange constitué d'oxyde de fer et de molybdène, les métaux étant, après la réduction, briquetés sans addition de liants, et les produits de Fe Mo briquetés étant frittés.

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