摘要： 以盐酸酸洗废液为原料，通过投加Na2S沉淀废液中的Pb2+，加入硅酸钠发生聚合作用，制备聚硅酸复合氯化铁絮凝剂（PSFC）。研究Na2S投加量和反应温度对Pb2+去除效果的影响，并对Na2S沉淀Pb2+的反应动力学进行探究。利用单因素实验法分析不同制备温度、n（Fe）：n（Si）、n（NaOH）：n（Fe）对Fe3+聚合形态和PSFC絮凝效果的影响，通过正交试验优化制备条件。结果表明，Na2S去除Pb2+最佳条件为n（Na2S）：n（Pb2+）=3.0，Na2S沉淀Pb2+反应满足一级反应动力学模型。絮凝剂最佳制备条件：温度为25℃、n（Fe）：n（Si）=25、n（NaOH）：n（Fe）=0.5。
关键词:
酸洗废液,
聚硅酸复合氯化铁,
絮凝剂,
水处理
Abstract: Polysilicon acid ferric chloride flocculant(PSFC) has been prepared by using waste pickling liquor(WPL) as raw material, adding the Na2S to precipitate Pb2+ in waste liquor, and adding sodium silicate to bring about polymerization. The influences of Na2S dosage and reaction temperature on Pb2+ removing effect have been investigated. In addition,the reaction kinetics of Na2S precipitation of Pb2+ has been probed into. The influences of different preparation temperatures,n(Fe):n(Si) and n(NaOH):n(Fe) on Fe3+ polymeric forms and PSFC flocculation effect have been analyzed by means single-factor tests,and the preparation conditions optimized by means of orthogonal tests. The results show that the optimal conditions of the Pb2+ removal by Na2S is n(Na2S):n(Pb2+)=3.0. The Na2S precipitation of Pb2+ obeys the first order reaction model. The optimal preparation conditions of the flocculant are as follows:the temperature is 25℃,n(Fe):n(Si)=25,n(NaOH):n(Fe)=0.5.
Key words:
waste pickling liquors,
polysilicon acid Ferric chloride,
flocculant,
water treatment
中图分类号:
徐斌, 陈程, 张毅敏, 李国瑞, 杨文忠, 彭福全, 孟瑞华. 酸洗废液制备聚硅酸复合氯化铁絮凝剂的研究[J]. 工业水处理, 2018, 38(9): 63-67.
Xu Bin, Chen Cheng, Zhang Yimin, Li Guorui, Yang Wenzhong, Peng Fuquan, Meng Ruihua. Research on the preparation of polysilicon acid ferric chloride flocculant from waste pickling liquor[J]. INDUSTRIAL WATER TREATMENT, 2018, 38(9): 63-67.