膨润土复合颗粒制备工艺及其吸附性能研究

针对矿山废水中酸度、重金属离子的高成本处理问题,采用经高温焙烧的膨润土-钢渣复合颗粒对Fe^(2+)、Mn^(2+)、Cu^(2+)和Zn^(2+)进行吸附。从去除效果、碱度释放量及散失率对复合颗粒的最佳制备工艺进行研究,并用其处理模拟酸性矿山废水(AMD)。结果表明,最佳制备工艺条件为:膨润土与钢渣配比5∶5,黏结剂用量5%,焙烧温度500℃,焙烧时间60 min;当吸附剂投加量为10 g/L,吸附时间为240 min时,酸性矿山废水中Fe^(2+)、Mn^(2+)、Cu^(2+)、Zn^(2+)的去除率分别为93.21%、87.31%、100%、89.68%,出水pH值为8.31。膨润土-钢渣复合颗粒可同步降低水中酸度,去除重金属离子,且处理成本较低,值得推广应用。

A Novel Method for the Fabrication of Granular Hydroxyapatite-bentonite Composite Adsorbents for the Removal of Pb2＋ from an Aqueous Solution

Granular HApB composite adsorbents, with dimensions of 4 mm × 4 mm, were prepared for the removal of lead from an aqueous solution. The effectiveness of the composites for Pb2＋ removal from an aqueous solution with different initial concentrations, adsorbent doses and reaction times were examined. The Langmuir isotherms, Freundlich isotherm models and pseudo-second order kinetic model were used in this analysis. It was found that the Langmuir model fitted the experimental data better than the Freundlich model, with a maximum adsorption capacity of 93.37 mg.g-1. The pseudo-second order kinetic model also fit the experiment data well with an adsorption capacity of 70.73 mg.g-1 after being reused for 3 times. Furthermore, the composites may possibly be used in processes for industrial water treatment.