竹浆绿液絮凝除硅工艺的探讨

采用絮凝法处理竹浆绿液中的硅,对絮凝除硅工艺絮凝剂的选择、工艺条件和流程的确定进行了研究。结果表明,铝盐改性钠基膨润土-CPAM-CaO对竹浆绿液中的硅有高效的去除作用,硅去除率最高可达99.9%。最佳工艺条件为:铝盐改性钠基膨润土用量26 g/L,质量分数0.4%的CPAM用量15 mL/L,CaO用量15 g/L,搅拌时间10 min,澄清时间5 min。并通过红外光谱分析结果验证了絮凝除硅法的可行性。

Investigation on Removal of Silicate in Green Liquor by Flocculation

Flocculation process was used to remove the silicate in green liquor from bamboo pulping chemical recovery. The chose of flocculant, the process parameters of flocculation was described. It was found that the Na-bentonite-CPAM-calcium oxide motified with aluminum salt had an efficient effect on silicate removal, the maximum removal rate reached to 99.9%. The optimum operating conditions were: the dosage of the aluminum salt modified Na-bentonite was 26 g/L, the dosage of CPAM was 15 mL/L, the calcium oxide was 15 g/L, stirring time was 10 min, clarification time was 5 min. Finally the process for commercial application was confinmed.