由天然锰结核水热合成钙锰矿的实验研究

Experiment on preparation of todorokite from nature manganese nodules by hydrothermal treatment

东太平洋的天然锰结核经0.1mol/LKMnO4溶液氧化,与1.0mol/LMgCl2溶液进行离子交换,在密闭高压釜中于180℃水热处理120h后,似水锰矿(buserite)转变成钙锰矿(todorokite).实验结果表明,水热反应能提高锰结核中钙锰矿的结晶度和含量,是实现天然锰结核相转变的关键;利用水热反应可将天然锰结核开发为钙锰矿型分子筛功能性材料.

Manganese nodules recovered from the Eastern Pacific Ocean floor was oxidized by 0.1 mol/L KMnO4, cation exchanged by 1.0 mol/L MgCl2, then autoclaved at 180°C for 120 h. Buserite in the raw material was successfully converted into todorokite. It shows that the hydrothermal treatment on manganese nodules, together with the oxidation and cation exchange, is an effective route for transforming nature buserite into todorokite, and increases the crystallinity and content of todorokite. Manganese nodules is a potential source for octahedral molecular sieve.