Abstract: Self-developed bentonite-steel slag composite particles are cheap and efficient mineral materials. By in-vestigating its removing effect on Mn²⁺ and the changing law of pH, comparing and analyzing its removing effects of composite particles, de-alkaline particles and single addition of alkali on Mn²⁺, phenomena, and SEM characterization of the surface microstructure of the composite particles, as well as XRD mineral phase characteristics, its synergistic mechanism for treating acidic mine wastewater containing Mn²⁺ has been further investigated. The results show that the composite particles treatment of wastewater containing Mn²⁺ not only has adsorption and chemical settlement effects, but also continues to adsorb and has poly-settlement effect after having surface adsorption for Mn²⁺ and forming surface chemical settlement. It means adsorption-polysettlement synergistic effect occurs. The occurrence of Mn²⁺ on composite particles surface is mainly the occurrence of polysettlement of Mn-Si-O combined mineral phase and CaMn₄Si₅O₁₄(OH)₂.

Key words: acidic mine wastewater containing Mn²⁺, composite particles, polysedimentation effect

摘要： 自行研发的膨润土-钢渣复合颗粒是廉价高效矿物材料。通过探究其对Mn²⁺的去除效果及pH变化规律，对比分析了复合颗粒、脱碱颗粒与单独加碱对Mn²⁺的去除效果、现象及复合颗粒表面微观结构的SEM表征、XRD矿物相特征，探究其处理含Mn²⁺酸性矿山废水的协同机理。结果表明，复合颗粒处理含Mn²⁺废水不仅具有吸附、化学沉淀作用，且表面吸附Mn²⁺并形成表面化学沉淀后还会继续吸附发生聚沉作用，Mn²⁺在复合颗粒表面的赋存状态主要以Mn-Si-O相结合的矿物相及CaMn₄Si₅O₁₄（OH）₂聚合沉淀存在。

关键词: 含Mn²⁺酸性矿山废水, 复合颗粒, 聚沉作用

CLC Number: 

• X703.1