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廢鐵回收電話-多年專業經驗「多圖」
2020-03-10





廢鐵回收分類。

廢鐵回收分類后,一些表面比較臟的廢鐵需要進行清洗,廢鐵回收清洗是用各種不同的化學溶劑或熱的表面活性劑,清除廢鐵表面的油污、鐵銹、泥沙等,經常處理機油、油污或其他附著物污染的發動機、軸承、齒輪等。

廢鐵回收還需要注意存放的問題,一般露天存放的廢鐵受潮后,由于夾雜的水分和其他潤滑脂和油會對熔融的金屬造成污染,也不宜加入煉鋼爐,會因炸裂作用而迅速在爐內膨脹,造成危險。





金屬回收利用

金屬回收利用化學法去污導致污染的可能性高,尤其是為了限制二次廢物產生量時,或采用循環去污時,污染的可能性更大。實施化學法表面去污時,由于要使用各種不同的化學試1劑和相應的專用設備及動力,因此,需要相當的運行費用支持,然而,這種運行費通常是可以接受的。但是,由于化學法表面去污會產生大量的二次廢液,它們的處理、整備、暫存和處置費用相對去污本身而言,可能要高出許多。



我國的金屬分類

按照我國的金屬分類,通常將鐵、錳、鉻及其合金稱為黑色金屬,其他金屬均列為有色金屬。實際上純凈的鐵與鉻都是銀白色的,而錳是銀灰色的,之所以把它們叫稱作黑色金屬,是因為鋼鐵表面常覆蓋一層黑色的四氧化三鐵,而錳和鉻又主要應用于冶煉合金鋼,因此被叫作黑色金屬。這種分法是沿用前蘇聯教科書的結果,不管從邏輯上還是從事物的本質上都欠科學。在歐美教科書中,金屬被分為鐵金屬和非鐵金屬兩大類,這樣比較科學、嚴謹。但是,在我國對黑色金屬、有色金屬的稱謂沿用已久,有時仍然沿用此稱謂。



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