【摘要】 以天然磁黄铁矿为净化剂,研究As（Ⅲ）在磁黄铁矿表面的吸附、转化行为;基于机械活化原理,开发高质量浓度含砷废水净化除砷技术。研究结果表明:As（Ⅲ）吸附在磁黄铁矿表面,并与表面S^2-发生作用生成As₂S₃,矿物表面同时发生氧化反应生成少量As₂S₅,As₂O₃和As₂O₅,表面含砷组分及单质硫在一定程度上阻碍磁黄铁矿与溶液中砷的进一步反应。通过对磁黄铁矿进行机械活化处理,一方面,可减小磁黄铁矿粒度、增大比表面积,另一方面,暴露具有较高活性的新鲜表面,极大地提高磁黄铁矿的除砷效率;当pH为3.0～3.5、温度为80℃、反应时间为24 h、磁黄铁矿初始质量浓度为12 g/L时,砷的去除率大于97%。更多还原

【Abstract】 Natural pyrrhotite was used as a purifying agent to study the adsorption and transformation behavior of As（Ⅲ） on the surface of pyrrhotite. Based on the mechanical activation, the arsenic removal technology of acid wastewater with high mass concentration of arsenic was developed. The results show that As（Ⅲ） adsorbs on the surface of pyrrhotite and reacts with surface S^2- to form As₂S₃. The surface of the mineral is simultaneously oxidized to form a small amount of As₂S₅, As₂O₃ and As₂O₅. The presence of arsenic-containing components and elemental sulfur on the surface hinder the further reaction of pyrrhotite with arsenic in the solution to some extent.On the one hand, activated treatment of pyrrhotite by mechanical activation reduces the size of pyrrhotite and increases the specific surface area. On the other hand, it exposes the fresh surface with higher activity, and greatly improves the arsenic removal efficiency of pyrrhotite. The removal rate of arsenic is over 98% when pH is 3.0-3.5 and temperature is 80 ℃, with reaction time being 24 h, and an initial dosage of pyrrhotite being 12 g/L.更多还原