500万彩票

熔鋁爐耐火材料

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關鍵詞

熔鋁爐,熔煉爐,有色金屬熔煉設備都對耐火材料有很高的要求,熔鋁爐用耐火材料要滿足以下六大要求。
(1)有良好的化學穩定性
金屬鋁及鋁合金不僅化學活性高,而且其熔液的流動性極好。鋁熔液在750℃時的粘度僅為1.04厘泊,與20℃時水的粘度(1.0厘泊)相當接近,這就是其易向爐襯內部滲透和發生化學反應的主要原因。在鋁液同耐火材料相接觸的溫度下,鋁起強還原劑作用。耐火材料中的SiO2、TiO2、FeO等氧化物要被鋁還原。鋁液同爐襯耐火材料之間的反應不僅使產品的質量受到影響,而且使爐襯表面結瘤、鼓包和沉淀雜物,受鋁液浸漬部分和原磚的界面有出現裂紋的危險,停爐時還會引起剝落。所以,同鋁液接觸的爐襯材料,必須具有很高的化學穩定性和盡可能少的浸漬量。
(2)有良好的抗沖刷性
一般為了使爐子有較高的電效率,爐壁材料都設計的很薄,但爐子運行過程中,由于電磁力的作用,爐內金屬液不停地翻騰和攪拌,對爐襯不斷地沖刷和磨損。對有心感應爐,由于采用了噴流型熔溝,熔溝耐火材料受到的沖刷和磨損更為嚴重。所以,要求所用耐火材料必須具有很高的機械強度和硬度。
(3)有較高的致密度和體積穩定性
作為熔煉爐用耐火材料,在材質一定的情況下,都希望獲得較高的致密度和體積穩定性。體密的高低,反應了成型體內部氣孔含量多少,特別是燒結程度的好壞。材料的體積穩定性愈高,燒結和使用過程產生裂紋的可能性愈小,所產生裂紋的寬度愈小,抗滲透能力愈強。
(4)不易產生爐瘤
極少可能由于熔融物表面或內部存在的雜質(例如Al2O3)而形成爐瘤。因為爐瘤會使爐子容量顯著降低,而且金屬瘤本身致密、堅韌,除掉是非常困難的。
(5)不易被金屬液潤濕和滲透
眾所周知,耐火材料是脆性材料,在加熱和冷卻過程中不可避免地要產生裂紋。但決定其壽命的關鍵因素之一是裂紋的大小和裂紋擴展的速度。而裂紋擴展與金屬液對所接觸材料的潤濕和滲透能力大小有關。潤濕能力愈差,愈有利。
(6)耐急冷急熱性能好
這一點對無心感應爐特別重要。因為無心爐作業方式為“加料—熔化—出爐”過程的不斷循環,爐襯材料反復受到熱沖擊。若耐火材料熱震穩定性不佳,則極易產生裂紋和裂紋擴展,金屬液會在短期內滲透到線圈處,導致整臺爐襯報廢。

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