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新聞動態

NEWS INFORMATION

新聞動態

砂磨機濕法研磨鋁顏料工藝選材

發布時間:2018-05-13  點擊次數:4181 次
       霧化鋁粉是鋁在高壓氣中噴霧制成。外觀呈銀灰色,粒子為球狀、水滴狀,顆粒表面有一層致密的氧化膜,在干燥、常溫下可長期貯存。霧化鋁粉應保持干燥、顆粒的粒度均勻。所謂干燥是指無水分存在,鋁粉中含有少量的水也會帶來多害處。當鋁粉在球磨機內研磨時被延展和粉碎,新的表面不斷出現并且容易與水發生化學反應放出熱和產生氫氣,造成危險。與水發生化學反應的鋁表面也因鈍化而降低吸附脂肪酸的能力,既影響產品質量,又不利于產品貯存。霧化鋁粉要進行細致的篩分而分級,不同粒度范圍的鋁粉需要不同的研磨時間。如果粗、細不等的鋁粉混在一起,將影響球磨效率。球磨法粉碎的特點是加入物料的粒度在研磨中等效下降,當較細的原始粒子已在研磨中粉碎到標準細度時,較粗的尚需繼續粉碎才能達到標準,從而使前者產生“過磨”現象,鱗片狀鋁粉發生破裂,降低了徑厚比,導致水面遮蓋能力和漂浮力下降。而且過細的粒子多而細,鋁粉的金屬光澤下降甚至發黑。過細的粒子還易發生凝聚,使產品“返粗”。因此,霧化鋁粉的分級是重要的工藝程序。

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