Abstract

The article presents the results of sorption of rare earth metal (REM) cations on samples of deep-sea base metal sulfides in the Broken Spur and TAG hydrothermal fields (Mid-Atlantic Ridge). The studied samples contain the following major minerals: marcasite, pyrrhotite, pyrite, and sphalerite in the Broken Spur field; chalcopyrite, pyrite, and marcasite in the TAG field. It has been established that these Fe–Cu–Zn sulfide minerals are natural absorbents. The exchange capacity of sulfide minerals for REM cations is 0.006‒0.061 mg-equiv/g. The exchange complex of sulfide minerals comprises the cations of alkaline, alkali-earth metals, and main cations of metals in the crystal lattice – Fe, Zn, Cu (in very limited quantities). The mechanism of the REM cation absorption is ion-exchange equivalent to the exchange cations of sulfide minerals. It was found that REM cations occur in the sulfide minerals almost completely in the sorbed form (more than 90% of the total amount). Apparently, the chemically bound form is possible only for Lu and Dy cations. The mineral composition of sulfide deposits is preserved in the exchange reaction products, and new phases do not appear.

中文翻译：

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大西洋 Broken Spur 和 TAG 热液场中贱金属硫化物对稀土金属阳离子的吸附

摘要

本文介绍了稀土金属 (REM) 阳离子在 Broken Spur 和 TAG 热液田（大西洋中脊）深海贱金属硫化物样品上的吸附结果。研究样品包含以下主要矿物：Broken Spur 油田的白铁矿、磁黄铁矿、黄铁矿和闪锌矿；TAG 场中的黄铜矿、黄铁矿和白铁矿。已经确定这些 Fe-Cu-Zn 硫化物矿物是天然吸收剂。硫化物矿物对 REM 阳离子的交换容量为 0.006-0.061 mg-equiv/g。硫化物矿物的交换络合物包含碱金属、碱土金属的阳离子，以及晶格中金属的主要阳离子 – Fe、Zn、Cu（数量非常有限）。REM阳离子吸附的机理是离子交换，相当于硫化物矿物的交换阳离子。结果发现，REM 阳离子几乎完全以吸附形式存在于硫化物矿物中（占总量的 90% 以上）。显然，化学键合形式仅适用于 Lu 和 Dy 阳离子。硫化物矿床的矿物成分保留在交换反应产物中，不会出现新相。