铝土矿作为砷过滤剂的应用

S. Ndur, H. Osei, C. E. Abbey, T. Joe-asare
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引用次数: 2

摘要

砷有可能对土壤和地下水质量产生负面影响,并造成若干公共卫生挑战。它通常在含砷矿物的矿石的金属开采过程中被浓缩和释放。已制订补救策略,以避免污染。在本研究中,对来自加纳Awaso的铝土矿进行了表征,并在不同的温度、Eh和ph条件下测试了其对砷的隔离能力。研究表明,在使用范围内,最佳粒度为80% - 2毫米,因为它易于渗透,砷去除率约为95%。该反应是一种自发的、热力学稳定的准二级反应,与Langmuir吸附等温线相当。接触20分钟内吸附量达到80%左右,解吸率较低,小于1.8%。因此,该研究得出结论,铝土矿是砷的良好过滤器。关键词:砷,铝土矿,过滤器,吸附,等温线
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Use of Bauxite as an Arsenic Filter
AbstractArsenic (As) has the potential to negatively affect soils and groundwater quality, and cause several public health challenges. It is usually concentrated and released during metal mining of ores that contains arsenic-bearing minerals. Remediation strategies are in place to avoid pollution. In this study, bauxite from Awaso, Ghana, was characterised, and its ability to sequester As was tested under varying conditions of temperature, Eh and pH. The study showed that the best particle size in the range utilised was 80% passing 2 mm as it allowed easy percolation, and As removal was about 95%. The reaction is a favourable pseudo-second order reaction that is spontaneous and thermodynamically stable and compares well with the Langmuir Sorption Isotherm. About 80% sorption was achieved within 20 minutes of contact with low desorption rate of less than 1.8%. The study thus concludes that bauxite is a good filter for arsenic. Keywords: Arsenic, Bauxite, Filter, Sorption, Isotherm
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