Process for producing a hard metal batch

B - Operations – Transporting – 22 – F

Patent

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Details

B22F 1/00 (2006.01) B22F 3/12 (2006.01) B22F 9/04 (2006.01) C22C 1/04 (2006.01)

Patent

CA 2515379

The invention relates to a method for producing a hard metal stock by drying a wet sludge (3), which is obtained by the wet grinding of the hard substance and binding metal to the desired particle size, in the quantities required for the finished stock, using water as the liquid phase. According to the invention, the wet sludge (3) with a solid content of between 75 and 95 wt. % and a layer thickness of between 0.2 and 2 mm is applied to a moving carrier belt (1). The wet sludge (3) is brought up to a maximum temperature in excess of 100 ~C - 150 ~C during a period of 1 - 7 minutes as it passes through a drying zone (4). The length of time in which the wet sludge (3) is heated to more than 100 ~C lies between 15 seconds and 2 minutes. The hard metal stock obtained in this manner is then cooled to an ambient temperature and crushed if required.

L'invention concerne un procédé de production d'une préparation de métal dur , selon lequel on fait sécher une boue humide (3) qui a été obtenue par mouture à l'état humide, à la taille de grain voulue et à l'aide d'eau en tant que phase liquide, des proportions souhaitées, pour la matière finie, de substances dures et de métal de liaison. Selon l'invention, la boue humide (3), qui présente une teneur en solides de 75 à 95 % en poids et une épaisseur de couche de 0,2 mm à 2 mm, est placée sur une bande de transport (1) en mouvement. Lors de la traversée d'une zone de séchage (4), la boue humide (3) est amenée, pendant une période totale d'1 minute à 7 minutes, à une température maximale supérieure à la plage 100 ·C-150 ·C. La période pendant laquelle la boue humide (3) est amenée à une température supérieure à 100 ·C est comprise dans la plage 15 secondes-2 minutes. La préparation de métal dur ainsi séchée est ensuite refroidie jusqu'à la température ambiante et, si nécessaire, broyée.

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