曹端宁, 王叶雷, 张硕, 田成, 文娟, 李紫龙, 鹿存房. 钢渣去除酸性矿山废水硫酸盐的机理研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.05.12.001
引用本文: 曹端宁, 王叶雷, 张硕, 田成, 文娟, 李紫龙, 鹿存房. 钢渣去除酸性矿山废水硫酸盐的机理研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.05.12.001
Mechanism of the sulfate removal process for acid min drainage using basic oxygen furnace slag[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.05.12.001
Citation: Mechanism of the sulfate removal process for acid min drainage using basic oxygen furnace slag[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.05.12.001

钢渣去除酸性矿山废水硫酸盐的机理研究

Mechanism of the sulfate removal process for acid min drainage using basic oxygen furnace slag

  • 摘要: 我国酸性矿山废水(AMD)中硫酸盐含量普遍较高,有效去除废水中的硫酸盐对于酸性矿山废水的治理具有重要意义。鉴于转炉钢渣处理AMD具有较好的应用前景,本文采用实验方法分析了硫酸盐在钢渣处理AMD中的去除效果及机理,结果表明钢渣粒度、废水pH值、固液比、硫酸盐浓度会影响硫酸盐去除效率。当钢渣粒径小于75μm, pH为2,固液比为70 g/L时,初始硫酸盐浓度为2000 mg/L时,硫酸盐的去除率最高为79.15 %,吸附量分为36.79 mg/g;动力学分析表明及机理分析表明,硫酸盐的去除符合准二级动力学模型和Freundlich等温吸附模型,钢渣与硫酸盐间的作用以多层化学吸附为主,同时伴随化学沉淀、静电吸附和表面络合作用。

     

    Abstract: The sulfate content in acid mine wastewater (AMD) is generally high in China, and it is of great significance to remove sulfate in AMD. In view of the good application prospect of steel slag treatment for AMD, this paper analyzes the effect and mechanism of sulfate removal in steel slag treatment. The results show that the size of steel slag, AMD pH value, solid-liquid ratio and the initial sulfate concentration could affect the sulfate removal efficiency. When the steel slag particle size, pH, solid-liquid ratio and initial sulfate concentration were less than 75μm, 2, 70 g/L and 2000 mg/L, the highest sulfate removal rate was 79.15%, and the adsorption capacity was 36.79 mg/g. The kinetic analysis and mechanism analysis showed that the sulfate removal conforms to the quasi-second-order kinetic model and Freundlich isothermal adsorption model, while the interaction between sulfate and steel slag is mainly multilayer chemisorption, accompanied by chemical precipitation, electrostatic adsorption and surface complexation.

     

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