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碱式硫酸铝溶液吸收二氧化硫

Keywords: 碱式硫酸铝,吸收,解吸,饱和吸收量

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Abstract:

为了探讨碱式硫酸铝对二氧化硫的吸收效果,对所需试剂硫酸铝和碳酸钙的适宜比例(碱度),以及碱式硫酸铝能稳定存在的铝量范围等进行了研究,测定了不同铝量和碱度的碱式硫酸铝对二氧化硫的吸收量以及pH值,并分析每种吸收液的饱和吸收量,最后将其与乙二胺/磷酸溶液的吸收情况进行对比。结果表明,碱度为40%时,铝量要保持在70g/L以下才能在加热时不产生沉淀,吸收过程pH由4.5左右一直下降到2.0左右保持稳定,饱和吸收时间控制在140~160min为宜,较为理想的方案是铝量32g/L,碱度35%。

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