Sulfur speciation analysis in cyanide leach solutions with liquid chramotography

IF 1.5 4区 工程技术 Q3 METALLURGY & METALLURGICAL ENGINEERING Mining, Metallurgy & Exploration Pub Date : 2024-03-02 DOI:10.1007/s42461-024-00942-2
N. Duru, C. Nesbitt
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Abstract

During the cyanide leaching process, gold and silver ores that come from the transition zones, which typically contains low levels of sulfide, may produce one or more of the following reduced sulfur species: sulfide (HS), polysulfides (Sn2−), thiocyanate (SCN), thiosulfate (S2O32−), trithionate (S3O62−), tetrathionate (S4O62−), pentathionate (S5O62−), hexathionate (S6O62−). The actual speciation of the reduced sulfur species in the circuits will primarily depend on the redox potential, pH, cyanide levels, and existing sulfur species in recycled process water, as well as the presence of other reactive metal species. The development of an accurate analytical method for sulfur species in cyanide leaching units of gold ores where sulfur speciation occurs has an important role in explaining the metal recovery deviations. This study presents the speciation of sulfur species and the development of ion chromatography method to analyze reduced sulfur species thiocyanate (SCN), thiosulfate (S2O32−), trithionate (S3O62−), tetrathionate (S4O62−) in cyanide leaching circuits for gold ores. The method developed has resulted in precise quantification of target sulfur species in leach solutions. Method development and validation results were illustrated on analytical graphs containing each species’ peak number, retention time (min), type, width (min), area (mAU*s), height (mAU), and area distribution (%) of the peak.

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利用液相色谱法分析氰化浸出液中的硫标度
在氰化浸出过程中,来自过渡带(通常硫化物含量较低)的金银矿石可能会产生以下一种或多种还原硫:硫化物 (HS-)、多硫化物 (Sn2-)、硫氰酸盐 (SCN-)、硫代硫酸盐 (S2O32-)、三硫酸盐 (S3O62-)、四硫酸盐 (S4O62-)、五硫酸盐 (S5O62-)、六硫酸盐 (S6O62-)。回路中还原硫物种的实际种类主要取决于氧化还原电位、pH 值、氰化物含量、循环工艺水中现有的硫物种以及其他活性金属物种的存在。在金矿氰化浸出过程中,硫的种类会发生变化,因此开发一种准确的硫种类分析方法对于解释金属回收率偏差具有重要作用。本研究介绍了金矿氰化浸出回路中硫的种类和离子色谱分析还原硫硫化物硫氰酸盐(SCN-)、硫代硫酸盐(S2O32-)、三硫酸盐(S3O62-)、四硫酸盐(S4O62-)的方法。所开发的方法可精确定量浸出液中的目标硫种。方法的开发和验证结果在分析图中进行了说明,图中包含每个物种的峰数、保留时间(分钟)、类型、宽度(分钟)、面积(mAU*s)、高度(mAU)和峰面积分布(%)。
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来源期刊
Mining, Metallurgy & Exploration
Mining, Metallurgy & Exploration Materials Science-Materials Chemistry
CiteScore
3.50
自引率
10.50%
发文量
177
期刊介绍: The aim of this international peer-reviewed journal of the Society for Mining, Metallurgy & Exploration (SME) is to provide a broad-based forum for the exchange of real-world and theoretical knowledge from academia, government and industry that is pertinent to mining, mineral/metallurgical processing, exploration and other fields served by the Society. The journal publishes high-quality original research publications, in-depth special review articles, reviews of state-of-the-art and innovative technologies and industry methodologies, communications of work of topical and emerging interest, and other works that enhance understanding on both the fundamental and practical levels.
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