SORPTION OF FLUORIDE IONS BY IRON OXYHYDRATE FIXED ON THE CARRIERS. Part 1. Organic carriers

V. Yegorov, O. Makovskaya, S. Mamyachenkov, P. Kozlov
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Abstract

The article considers possibility of using inorganic sorbent – iron oxyhydrate (IOH) – to remove F– ions from process solutions of zinc production. The method of IOH synthesis is chosen. The results of scanning electron microscopy and X-ray phase analysis are presented. The principal possibility of using ion-exchange resins as IOH-modified carriers is considered. The paper studies active substance formation on anion and cation exchange resins. It is shown that the most durable composite sorbents are obtained using strongly acidic cation exchange resins with SO3– groups. A method for introducing IOH into the structure of carrier materials and obtaining composite sorbents is described. The KU-2×8 strongly acidic cation exchanger is recommended as a composite base. Cation exchangers saturated with iron were held in a sodium chloride solution with a concentration of 2,5 g/dm3 for 24 hours at 85 °C to ensure formation of β-modification IOH crystals distributed over the ion exchanger grain volume. Anion exchangers were held in an iron(III) sulfate solution with added sodium chloride for 24 hours at 85 °C. At the same time, iron oxyhydrate films formed on the surface of sorbent grains were observed. Fluorine sorption was carried out in a static mode from a standardized test solution with a concentration of F– = 100 mg/dm3 at 60 °C. Sorption on the AB-17×8 anionite was carried out at 20 °C. Absorbed fluorine was desorbed by the NaOH (0,1 M) solution at 60 °C for 2 hours. The synthesized KU-2×8-IOH composite sorbent has a fluorine capacity of 0,7–1,1 mg/g, and can be regenerated with resulting easily utilizable fluorine-containing eluate.
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用固定在载体上的氧化铁吸附氟离子。第1部分。有机载体
探讨了用无机吸附剂水合氧化铁(IOH)去除锌生产工艺溶液中F离子的可能性。选择了IOH合成方法。给出了扫描电镜和x射线相分析结果。讨论了离子交换树脂作为氢氧化钾改性载体的主要可能性。研究了阴离子交换树脂和阳离子交换树脂中活性物质的形成。结果表明,含SO3 -基团的强酸性阳离子交换树脂是最耐用的复合吸附剂。介绍了一种将氢氧化钾引入载体材料结构并获得复合吸附剂的方法。建议使用KU-2×8强酸性阳离子交换剂作为复合碱。将饱和铁离子交换剂置于浓度为2.5 g/dm3的氯化钠溶液中,在85℃下保持24小时,以确保β-修饰IOH晶体的形成分布在离子交换剂颗粒体积上。阴离子交换剂在硫酸铁(III)溶液中加入氯化钠,在85℃下保持24小时。同时,还观察到吸附颗粒表面形成氧化铁膜。在60°C下,从浓度为F - = 100 mg/dm3的标准化测试溶液中以静态模式进行氟吸附。在20℃下,在AB-17×8阴离子石上进行吸附。吸收的氟用NaOH (0.1 M)溶液在60℃下解吸2小时。合成的KU-2×8-IOH复合吸附剂的含氟量为0.7 - 1.1 mg/g,可再生得到易于利用的含氟洗脱液。
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