生产实践表明,硫在氧化铝生产流程中循环积累,有碍烧成和蒸发并导致碱耗增加,从而恶化技术经济指标。因此硫的排除一直是国内外研究的重要课题。尽管提出了种种排硫方法,但具实效的排硫方案不外有两类:一是添加还原剂硫以硫化物形态随弃赤泥排出流程;二是蒸发析出硫酸钠复盐另行处理。前者最大的优点可谓是“无专人操作、无专用设 Production practice shows that sulfur accumulates in the alumina production process, which hinders the sintering and evaporation and leads to the increase of alkali consumption, thus worsening the technical and economic indicators. Therefore, the exclusion of sulfur has always been an important issue at home and abroad. Although various methods for sulfur removal have been proposed, there are only two types of effective sulfur removal methods: one is to add sulfur as a reducing agent to the process of removing red mud; and the other is to separate the sodium sulfate by evaporation. The former biggest advantage can be described as "no expert operation, no dedicated facilities