Considering the low corrosiveness of polyphosphoric acid to the stainless steel,the combustion chamber,which was made of stainless steel without inner lier,was used in the two-step method process.

• 利用多聚磷酸对不锈钢的低腐蚀特性,在二步法工艺中采用无衬里不锈钢燃磷塔。