Alkaline pretreatment of a polymetallic sulfide (Fe-Pb-Mn) ore containing silver increases the efficiency of cyanidation by decreasing elemental sulfur content and by exposing sulfide surfaces
Alkaline pretreatment of a polymetallic sulfide (Fe-Pb-Mn) ore containing silver increases the efficiency of cyanidation by decreasing elemental sulfur content and by exposing sulfide surfaces
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对含银多金属硫化物 (Fe-Pb-Mn) 矿石进行碱性预处理，通过降低元素硫含量和暴露硫化物表面来提高氰化效率
DOI：
10.1016/j.mineng.2023.108325
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发表时间：
2023
影响因子：
4.8
通讯作者：
Rodriguez-Reyes, Juan Carlos
中科院分区：
文献类型：
--
作者：
Larrabure, Gonzalo;Silva-Quiñones, Dhamelyz;Teplyakov, Andrew V.;Rodriguez-Reyes, Juan Carlos
多金属硫化物矿石往往不适合氰化浸出，因为有几种元素和矿物能够干扰这一过程。因此，经常研究各种策略，如化学预处理，以提高氰化效率。除了这些策略的结果之外，重要的是要了解在这些预处理过程中矿物样品上发生的变化。在此，对由多金属硫化物（Fe-Pb-Mn）组成的银精矿（~ 8 kg Ag/t）进行碱性预处理，在随后的氰化过程中将银的提取率从40%提高到80%，并将氰化物消耗量减少一半（从大约60 kg NaCN/t降低到30 kg NaCN/t）。x射线衍射（XRD）和ICP-MS表明，预处理可以去除大量的单质硫，这是一种已知的杀氰剂。化学分析证实了大量硫的溶解，这也证明了预处理过程中铁、铅、锰和银的溶解可以忽略不计。在表面水平，x射线光电子能谱（XPS）表明预处理暴露了新的硫化物表面（如黄铁矿）。此外，XPS光谱表明，预处理有利于清洁矿物表面的暴露。清洁表面的存在表明浸出剂在矿物中的扩散更均匀，更少阻碍。事实上，将提取数据拟合到收缩核模型表明，预处理样品具有近乎理想的扩散控制过程，而在未经处理的样品中，这种拟合不太充分。在未处理和预处理样品的氰化过程中，在表面检测到铅积聚（再吸附），这表明这种现象不影响浸出过程的效率。这项研究强调了将整体分析方法与表面敏感技术相结合的重要性，以获得对浸出过程更全面的了解。
Polymetallic sulfide ores are often not amenable to cyanide leaching due to the presence of several elements and minerals capable of interfering with this process. Thus, various strategies, such as chemical pretreatments, are often studied to improve the efficiency of cyanidation. Beyond the results of such strategies, it is important to understand the changes occurring on the mineral samples during these pretreatments. Herein, an alkaline pretreatment was applied to a silver concentrate (∼8 kg Ag/t) composed of polymetallic sulfides (Fe-Pb-Mn), which increased the silver extraction during subsequent cyanidation from 40% to 80% and decreased the cyanide consumption in half (from approximately 60 to 30 kg NaCN/t). X-ray diffraction (XRD) and ICP-MS indicated that the pretreatment could remove significant amounts of elemental sulfur, which is a known cyanicidal agent. The dissolution of significant amounts of sulfur was confirmed by chemical analysis, which also demonstrated that the dissolution of iron, lead, manganese, and silver were negligible during pretreatment. At surface level, X-ray photoelectron spectroscopy (XPS) demonstrated that the pretreatment exposes fresh sulfide surfaces (e. g. pyrite). In addition, the XPS spectra indicated that the pretreatment facilitated the exposure of clean mineral surfaces. The presence of cleaner surfaces suggested a more uniform and less hindered diffusion of leaching agents through the mineral. Indeed, fitting the extraction data to the shrinking core model showed that pretreated samples featured a nearly ideal diffusion-controlled process, while in the case of untreated samples this fitting was less adequate. During cyanidation of both untreated and pretreated samples, lead build-up was detected on the surface (readsorption), which suggested that this phenomenon does not affect the efficiency of a leaching process. This study highlights the importance of combining bulk analytical methods with surface-sensitive techniques to obtain a more complete understanding of leaching processes.
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DOI：
10.1021/acs.jpcc.6b12896
发表时间：
2017-04-06
期刊：
The journal of physical chemistry. C, Nanomaterials and interfaces
影响因子：
--
作者：
Duan Y;Rani S;Zhang Y;Ni C;Newberg JT;Teplyakov AV
通讯作者：
Teplyakov AV
在超声处理和碱性预处理下进行氰化物浸出的多金属 (Mn-Fe-Pb) 硫化物的表面过程：了解使用 X 射线光电子能谱 (XPS) 提取银的差异
DOI：
--
发表时间：
2021
期刊：
影响因子：
--
作者：
G. Larrabure;Sheyla Chero;D. Silva;C. Benndorf;Mackenzie G. Williams;Fei Gao;C. Gamarra;A. Alarcón;Carlos Segura;A. Teplyakov;J. Rodriguez
通讯作者：
J. Rodriguez
影响因子：
4.8
作者：
M. Aylmore
通讯作者：
M. Aylmore
影响因子：
4.7
作者：
O. Celep;E. Y. Yazici;Pelin Altinkaya;H. Deveci
通讯作者：
O. Celep;E. Y. Yazici;Pelin Altinkaya;H. Deveci
通过使用偏光显微镜和 X 射线光电子能谱 (XPS) 分析抛光切片来识别复杂矿石中单个矿物的表面过程
影响因子：
2.5
作者：
D. Silva;Chuan He;Melissa Jacome;C. Benndorf;A. Teplyakov;J. Rodriguez
通讯作者：
J. Rodriguez