Abstract

Data on the mineral and chemical composition of samples of sulfide deposits from the Broken Spur and TAG (Mid-Atlantic Ridge) are presented. The main minerals in the Broken Spur field are marcasite, pyrrhotite, pyrite, chalcopyrite, and sphalerite; in sample from TAG: chalcopyrite, pyrite, and marcasite. It has been established that these sulfide minerals of Fe, Cu, and Zn are natural ion exchangers and belong to the class of adsorbents. Exchange capacity of sulfide minerals in terms of heavy metal cations (Ni²⁺, Co²⁺, Cd²⁺, and Pb²⁺) is 0.022–0.32 mg-equiv/g. In the exchange reaction products, the mineral composition of sulfide deposits is retained, and new phases do not appear. It is suggested that the adsorbed heavy metal cations populate either vacant cationic or interstitial defect sites in the structures of sulfide minerals. Bond strength of the adsorbed heavy metal cations with the main structural elements of minerals is low, which is confirmed by their high extraction in an acid medium. The results of adsorption-desorption experiments indicate two forms of heavy metal cations in sulfide minerals: adsorbed (basic) and chemically bound.

中文翻译：

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破碎的杂散和TAG水热场中大西洋中贱金属硫化物对重金属阳离子的吸附

摘要

给出了来自“破碎马刺”和TAG（中大西洋海脊）的硫化物矿床样品的矿物和化学成分数据。破碎马刺场中的主要矿物是镁铁矿，黄铁矿，黄铁矿，黄铜矿和闪锌矿。在TAG样品中：黄铜矿，黄铁矿和镁铁矿。已经确定，这些Fe，Cu和Zn的硫化物矿物是天然离子交换剂，属于吸附剂类别。硫化物矿物的重金属阳离子（Ni 2 ⁺，Co 2 ⁺，Cd ²⁺和Pb ²⁺）为0.022-0.32毫克当量/克。在交换反应产物中，硫化物沉积物的矿物成分得以保留，并且不会出现新的相。建议吸附的重金属阳离子在硫化物矿物结构中占据空缺的阳离子或间隙缺陷位点。吸附的重金属阳离子与矿物的主要结构元素的结合强度很低，这可以通过在酸性介质中的高萃取率来证实。吸附-解吸实验的结果表明，硫化物矿物中有两种形式的重金属阳离子：吸附（碱性）和化学结合。