FeCl_3赤泥控碱及离子效应研究Study on alkali control and lon effect of FeCl_3 red mud
成官文;张燎;韦桥权;张宇玲;徐敏;徐晓宇;岳远隋;
摘要(Abstract):
为开展赤泥土壤化处置研究,采用 Fe Cl_3进行赤泥控碱。 研究表明,FeCl_3对赤泥具有一定的控碱效果,但赤泥 p H值的变化滞后于碱性阴离子质量比的变化。 Fe Cl_3赤泥控碱符合二级动力学过程,主要通过 Fe(3 +)与 OH(3 +)与 OH-、CO_3-、CO_32 2 -进行化学反应而带动其他次一级化学反应共同实现,与 Fe-进行化学反应而带动其他次一级化学反应共同实现,与 Fe(3 +)同体系内的碱性阴离子 OH(3 +)同体系内的碱性阴离子 OH-、CO_3-、CO_32 2 -、HCO_3-、HCO_3-和 Al O_2-和 Al O_2-反应平衡有关,并通过陈化时间的增加促使赤泥盐分向化学结合碱转化。 投加 3 g/ kg Fe Cl_3赤泥控碱,陈化 120 d 时,游离碱、CO_3-反应平衡有关,并通过陈化时间的增加促使赤泥盐分向化学结合碱转化。 投加 3 g/ kg Fe Cl_3赤泥控碱,陈化 120 d 时,游离碱、CO_32 2 -、AlO_2-、AlO_2-和 OH-和 OH-去除率均在 50% 及以上,且对 OH-去除率均在 50% 及以上,且对 OH-的去除效果较好,达到 60% ;电导率仅增大 0. 16 m S/ cm,盐分以 Na Cl 为主,矿相总量增加 12. 9% ,形成较大的难溶性颗粒,从而实现赤泥控碱。
关键词(KeyWords): 环境工程学;赤泥;FeCl_3;控碱;离子效应;土壤化处置
基金项目(Foundation): 中国铝业股份有限公司科技攻关项目(gxzz201903);; 广西重点研发计划项目(桂科AB20297039)
作者(Authors): 成官文;张燎;韦桥权;张宇玲;徐敏;徐晓宇;岳远隋;
DOI: 10.13637/j.issn.1009-6094.2021.0244
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