Special Features of Electro-Membrane Recovery of Acids and Alkalis from the Water-Soluble Wastes of Nuclear Power Plants

被引:1
|
作者
Sedneva, T. A. [1 ]
Ivanenko, V. I. [1 ]
Belikov, M. L. [1 ]
机构
[1] Russian Acad Sci, Kolskii Res Ctr, Tananaev Inst Rare Element & Mineral Chem & Techn, Apatity 184209, Russia
关键词
electrodialysis; recovery; anion-exchange; cation-exchange and bipolar membranes; boron; nitric acid; alkalis; IONIC LIQUIDS;
D O I
10.1134/S1023193522010116
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The results of studying of the nitric acid and NaOH + KOH alkalis' mixture recovery from concentrated solutions in filter-press-type electrodialyzers with anion-exchange, cation-exchange, and bipolar membranes are presented. The necessity of the technological solutions preliminary purification from calcium and boron compounds was established, in order to obtain crystalline boric acid (H3BO3) and gypsum (CaSO4 center dot 2H(2)O). The possibility of obtaining, from purified concentrated salt solutions, acids and alkalis with a concentration of similar to 300-600 g/L suitable for reuse is shown. This can be provided only by the electrodialysis with anion- and cation-exchange membranes, while electrodialysis with bipolar membranes is complicated by noticeable contamination of both acidic and alkaline solutions with salts.
引用
收藏
页码:216 / 225
页数:10
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