竹浆绿液絮凝除硅工艺的探讨

Investigation on Removal of Silicate in Green Liquor by Flocculation

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。

Flocculation process was used to remove the silicate in green liquor from bamboo pulping chemical recovery. The chose of floccu- lant, 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.