Thermodynamics of Arsenates, Selenites, and Sulfates in the Oxidation Zone of Sulfide Ores. XV. Synthetic Analog of Alfredopetrovite: Composition, Properties, and Stability Limits

IF 0.8 4区地球科学 Q3 GEOLOGY

Geology of Ore Deposits Pub Date : 2024-02-07 DOI:10.1134/s1075701523070139

K. L. Ushakova, M. V. Charykova, V. G. Krivovichev, N. M. Efimenko, N. V. Platonova, V. N. Bocharov, A. S. Mazur

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Abstract

The purpose of this work was to synthesize hexahydrate aluminum selenite Al₂(SeO₃)₃⋅6H₂O (analogous to the mineral alfredopetrovite) and study its solubility in water. Al₂(SeO₃)₃⋅6H₂O is synthesized from AlCl₃ and Na₂SeO₃ solutions at room temperature and atmospheric pressure. The obtained samples were studied using powder diffractometry, infrared and Raman spectroscopy, energy-dispersive X-ray microanalysis, nuclear magnetic resonance spectroscopy, and complex thermal analysis. Solubility was determined by isothermal saturation in ampoules at 25°C. Solubility products were calculated using Geochemist’s Workbench software package (GMB 9.0, SpecE8 program). As a result of the calculation, the average value logKsp[Al₂(SeO₃)₃⋅6H₂O] = –28.3 ± 0.5 was obtained. An Eh–pH diagram is constructed for the Al–Se–H₂O system, which was used to analyze the stability of alfredopetrovite in near-surface conditions.

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硫化矿氧化区砷酸盐、硒化物和硫酸盐的热力学。XV.Alfredopetrovite 的合成类似物：成分、性质和稳定性极限

摘要这项工作的目的是合成六水铝硒矿 Al2(SeO3)3⋅6H2O（类似于矿物 alfredopetrovite），并研究其在水中的溶解度。Al2(SeO3)3⋅6H2O 是在室温和常压下由 AlCl3 和 Na2SeO3 溶液合成的。利用粉末衍射仪、红外光谱和拉曼光谱、能量色散 X 射线显微分析、核磁共振光谱和复合热分析对所获得的样品进行了研究。溶解度是在 25°C 的安瓿瓶中通过等温饱和法测定的。使用 Geochemist's Workbench 软件包（GMB 9.0，SpecE8 程序）计算了溶解度乘积。计算得出的平均值为 logKsp[Al2(SeO3)3⋅6H2O] = -28.3 ± 0.5。构建了 Al-Se-H2O 系统的 Eh-pH 图，用于分析阿尔弗雷德辉石在近地表条件下的稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geology of Ore Deposits 地学-地质学

CiteScore

1.10

自引率

14.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Geology of Ore Deposits is a periodical covering the topic of metallic and nonmetallic mineral deposits, their formation conditions, and spatial and temporal distribution. The journal publishes original scientific articles and reviews on a wide range of problems in theoretical and applied geology. The journal focuses on the following problems: deep geological structure and geodynamic environment of ore formation; distribution pattern of metallogenic zones and mineral deposits; geology and formation environment of large and unique metallic and nonmetallic deposits; mineralogy of metallic and nonmetallic deposits; physicochemical and isotopic characteristics and geochemical environment of ore deposition; evolution of ore-forming systems; radiogeology and radioecology, economic problems in exploring, developing, and mining of ore commodities.