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用粉未冶金方法回收金属机械加工切屑具有重要意义。其回收技术主要有以下几种: 一、锌法回收 硬质合金碎屑的主要成分是碳化钨和钴,钴含量一般是4～25％,有些牌号硬质合金中还含碳化钼、碳化铌、碳化钛,有些耐腐蚀的牌号含铌和钼。由于锌法很适合于这些元素的回收,特别是从生产费用及所获得的产品质量考虑,都受到重视。 英国粉未冶金公司最初取得英国专利权的作法是将硬质合金在900℃下与熔融锌发生反应进行回收。经过Zn处理后,将所形成的Zn—Co合金进行酸浸提,回收WC、TiC、TaC:由浸提液回收Zn和Co需要单独进行。
The use of powder metallurgy method to recover metal machining chip is of great significance. The recovery of the technology mainly in the following categories: First, the main components of zinc carbide scrap recycling is tungsten carbide and cobalt, cobalt content is generally 4 to 25%, some grades of cemented carbide also contains molybdenum carbide, niobium carbide , Titanium carbide, some corrosion-resistant grades containing niobium and molybdenum. Because of the zinc method is very suitable for the recovery of these elements, especially from the cost of production and the quality of the product obtained by consideration, have been valued. The first British patent application by Powder Metallurgical UK was the recovery of cemented carbide from molten zinc at 900 ° C. After Zn treatment, the formed Zn-Co alloy is subjected to acid leaching to recover WC, TiC, and TaC. The recovery of Zn and Co from the leachate needs to be performed separately.