Dissolution of non-sulfide phases during the chemical and bacterial leaching of a sulfidic black schist

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• 作者：Tariq M. Bhatti^a ; ¹ ; Antti Vuorinen^b ; Olli H. Tuovinen^a ; ^{tuovinen.1@osu.edu}
• 关键词：Black schist ; Bacterial leaching ; Chemical leaching ; Feldspar ; Mica
• 刊名：Hydrometallurgy
• 出版年：2012
• 期刊代码：38_0304386x
• 类别：ce
• 出版时间：April, 2012
• 卷：117-118
• 期：Complete
• 页码：32-35
• 文件大小：358 K

摘要

The purpose of this study was to assess the solubilization of silicates during the chemical and bacterial leaching of finely ground black schist in shake flasks. The main sulfide minerals were pyrrhotite (Fe_{1 鈭?#xA0;x}S) and pyrite (FeS₂) with lesser amounts of sphalerite (ZnS), pentlandite (Ni,Fe,Co)₉O₈), violarite (FeNi₂S₄), and chalcopyrite (CuFeS₂). Quartz, micas, and feldspars were the main Si-containing phases. Dissolution of the non-sulfidic minerals was monitored by analysis of Si, Al, Ca, Mg, and K solubilized from the black schist in 30 day leaching experiments at 22 卤 2 掳C. The dissolution of main constituent elements from silicate minerals was a function of the pH of the leach solution and no direct role of bacterial action on the solubilization of silicates was evident. Ferrous or ferric iron addition did not affect the concentrations of elements dissolved from silicates except for mica interlayer K⁺, which was incorporated into the jarosite fraction.