氧化铝赤泥堆场盐分组成变化

发布时间：2018-03-30 14:32

本文选题：赤泥　切入点：赤泥堆场　出处：《中国有色金属学报》2016年11期

【摘要】：以典型赤泥堆场为研究对象,分析自然环境条件下赤泥堆场的盐分组成变化。结果表明:随着堆存年限的增加,赤泥中盐含量呈降低趋势;CO_3~(2-)是赤泥中占主导地位的阴离子,约占阴离子组成比例的34.14%~73.26%:赤泥可交换态阳离子及水溶态阳离子以Na~+为主,可交换态Na~+占可交换态阳离子组成比例60.50%~83.94%,水溶态Na~+占水溶态阳离子组成比例71.32%~91.16%:随着堆置年限的增加,赤泥中Ca~(2+)、HCO_3~-含量升高,而Na~+、SO_4~(2-)、CO_3~(2-)含量降低,K~+、Mg~(2+)含量变化趋势不明显;赤泥中盐含量和SO_4~(2-)、CO_3~(2-)、Na~+含量呈正相关关系,而与HCO_3~-、Ca~(2+)、Mg~(2+)含量呈负相关关系。Na~+含量和CO_3~(2-)含量过高是赤泥高盐分含量的主要原因,这为赤泥堆场土壤化处置和植被重建过程中盐分调控提供科学依据。
[Abstract]:The changes of salt composition of red mud dump under natural environment were analyzed. The results showed that the salt content in red mud decreased with the increase of storage life, and the salt content in red mud was the dominant anion in red mud. The ratio of exchangeable cations to exchangeable cations and water-soluble cations in red mud is mainly Na ~, the ratio of exchangeable Na ~ to exchangeable cations is 60.50% 83.94, the ratio of water-soluble Na ~ to water-soluble cations is 71.32% 91.16%: with the increase of stacking years, The content of Ca~(2 in red mud was increased, while the content of Na ~ + so _ 4 was reduced, the content of K ~ + -MgO _ (2) was decreased, and the content of salt in red mud was positively correlated with the content of so _ (4) and CO _ (3) O _ (3) -Na ~ (2) in red mud, and there was a positive correlation between the content of Na ~ (4) so _ (4) and the content of CO _ (3) and Na ~ ((2)) in red mud. The main reason for the high salt content of red mud is the negative correlation between the content of HCO _ 3 ~ + -CaO _ (2) and the content of MgO _ (2) and the content of Na ~ ~ and CO _ (3) ~ (2), which provides a scientific basis for the regulation of salt content in the process of soil disposal and vegetation reconstruction in red mud dump.
【作者单位】：中南大学冶金与环境学院;中南大学国家重金属污染防治工程技术研究中心;
【基金】：国家自然科学基金资助项目(41371475) 国家环保公益性行业科研专项(201509048)~~
【分类号】：X758

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