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近几年来,利用硅酸铝耐火纤维毡对热处理炉进行节能改造,在全国许多地方已得到了推广应用,节电效果显著。而精铸烘模壳用箱式电炉的节能改造工作至今尚未展开。其主要技术问题就是模壳在焙烧中由于氯化铵析出分解成氯化氢气体和氨气,对毡
In recent years, the use of aluminum silicate refractory fiber felt heat treatment furnace for energy saving, in many parts of the country has been promoted and applied, significant energy-saving effect. However, the energy-saving renovation of the box-type electric furnace for casting molds has not yet started. The main technical problem is that the mold shell is decomposed into hydrogen chloride gas and ammonia gas by precipitation of ammonium chloride during calcination,