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公开(公告)号：EP1373585A2
公开(公告)日：2004-01-02
申请号：EP02703388.5
申请日：2002-03-08
CPC分类号： C22C1/1084 , B22F1/0059 , B22F9/026 , B22F2998/10 , C22C1/051 , B22F9/04
摘要： The invention relates to a method for producing a hard metal projection made of hard material portions, binding metal portions and water-soluble pressing auxiliary agent portions by drying a wet slurry, which contains the constituents and pure water as the liquid phase. According to the invention, the hard material and binding metal portions are ground with water while forming a wet slurry and, after grinding, the pressing auxiliary agent portions are admixed in the form of an emulsion to the wet slurry. The emulsion is produced with the aid of an emulsifier while adding water.
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公开(公告)号：EP1373586A2
公开(公告)日：2004-01-02
申请号：EP02703390.1
申请日：2002-03-08
CPC分类号： B22F9/026 , B22F2998/10 , B22F2999/00 , C22C29/08 , B22F9/04 , C22C1/051
摘要： The invention relates to a method for producing a hard metal granulated material by carrying out wet milling and spray drying inside a spray tower -1- while using pure water as the liquid phase. According to the invention, the spray tower -1- is configured and operated in such a manner that the ratio of the amount of water, which is supplied over the wet slurry, in liters per hour ranges from 0.5 to 1.8 with regard to the tower volume in m3, and that a maximum of 0.17 kg wet slurry is supplied per m3 drying gas, whereby the wet slurry has a solids content ranging from 65 to 85 wt. %. Under these conditions, the usually necessary addition of a water-soluble, long-chain polyglycol to the wet slurry before spraying in order to prevent the hard metal granulated material from oxidizing is eliminated.
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