Process for the production of hard metal granulate

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 1/05 (2006.01) B22F 9/02 (2006.01) C22C 29/08 (2006.01)

Patent

CA 2406372

The invention relates to a process for the production of a hard metal granulate involving wet milling and spray drying in a spray tower (1) using pure water as the liquid phase. The essential characteristic of the invention is that the spray tower (1) is designed and operated in such a way that the ratio of the quantity of water added via the slurry (in liters per hour) to tower volume (in m3) is between 0.5 and 1.8 and in that a maximum of 0.17 kg of slurry is atomized per m3 of incoming drying gas, whereby the slurry has a solid particle concentration within a range of 65 - 85 % by weight. Under the conditions described above, the addition of a water-soluble, long- chain polyglycol to the slurry prior to spraying ordinarily required in order to prevent oxidation of the hard metal granulate is no longer necessary.

L'invention concerne un procédé permettant de produire un granulat de métal dur par mouture humide et séchage par pulvérisation dans une tour de pulvérisation 1 à l'aide d'eau pure comme phase liquide. Selon l'invention, la tour de pulvérisation 1 se présente et est actionnée de manière que le rapport de la quantité d'eau, exprimée en litres par seconde, acheminée par l'intermédiaire des boues humides, par rapport au volume de la tour exprimé en m?3¿ se situe entre 0,5 et 1,8, et qu'au maximum 0,17 kg de boues humides par m?3¿ de gaz de séchage soit acheminé. Les boues humides présentent une teneur solide de l'ordre de 65 à 85 % en poids. Ces conditions étant posées, l'adjonction nécessaire habituelle aux boues humides, de polyalcool à chaîne longue, soluble dans l'eau, avant la pulvérisation, afin d'empêcher toute oxydation du granulat de métal dur, n'est plus indispensable.

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