Abstract:

Polymeric aluminum magnesium chloride（PAMC）flocculant was prepared with two-step leaching process from bauxite ores，magnesium oxide and hydrochloric acid（20%）. The optimum preparation conditions were determined via orthogonal test by investigating the influence of sintering temperature and sintering time，as well as acid soluble rate，time and temperature on the leaching of PAMC. PAMC flocculant was prepared with basicity improvement by adding magnesium oxide. The obtained PAMC flocculant，which contains 9.6% of aluminum oxides and 46.3% of basicity，showed higher COD and color removal rate by approximately 20% as compared with that self-made or commercial available polymeric aluminum chloride flocculant when practically used in printing and dyeing wastewater treatment.

摘要：

以铝矾土、氧化镁粉和质量分数为20%的工业盐酸为原料，采用两段溶出工艺制备聚合氯化铝镁无机絮凝剂。通过正交实验考察了焙烧温度、焙烧时间、酸溶比例、酸溶时间和酸溶温度对氧化铝溶出的影响，确定了制备聚合氯化铝的最佳工艺条件。通过加入氧化镁粉提高产品盐基度得到聚合氯化铝镁絮凝剂。所得产品氧化铝含量9.6%，盐基度为46.3%。将该聚合氯化铝镁絮凝剂用于实际印染废水的处理，其COD和色度去除率比自制聚合氯化铝絮凝剂和市售聚合氯化铝絮凝剂均高出近20个百分点。