An Experimental Study of the Stability Relations, Na-K Exchange, and Isotope Exchange Properties of Jarosite at 200oC and Above

黄钾铁矾在200℃及以上稳定性关系、Na-K交换和同位素交换性质的实验研究

• 批准号: 9005536
• 负责人: Roger Stoffregen
• 金额: $ 6.5万
• 依托单位: Southern Methodist University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-06-01 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9005536&HistoricalAwards=false
• 关键词: Experimental; Study; Stability; Relations; Na

In this study, experiments will be conducted to determine the position of the jarosite and natrojarosite stability fields as functions of the H2SO4-K2SO4 and H2SO4-Na2SO4 Concentration in the coexisting aqueous phase. Experimental Temperatures will range from 200oC to the upper stability limit of jarosite and natrojarosite, which is expected to be below 450oC. In addition, the partitioning of sodium and potassium between jarosite and aqueous sulfate solutions, the D fractionation between the hydroxyl sites of jarosite and water, and 18O fractionation between the jarosite hydroxyl and sulfate sites and water will be measured. These experiments, which will be conducted in standard cold-seal hydrothermal vessels at a pressure of 500 bars, are an extension of work in progress on alunite to a ferric-iron bearing system. They should improve our ability to interpret isotope data on acid-sulfate alteration, which frequently includes both alunite and jarosite. In addition, they will help to constrain the chemical and isotope systematics of jarosite at lower temperatures, and thus complement ongoing studies of jarosite at 25oC. A better understanding of the properties of jarosite at surficial conditions will be important in the study of acid-mine drainage, and also in the interpretation of natural weathering and oxidation of pyritic ore deposits.

在这项研究中，将进行实验，以确定 黄钾铁矾和钠黄钾铁矾稳定性场的位置， H_2SO_4-K_2SO_4和H_2SO_4-Na_2SO_4浓度函数 共存的水相。 实验温度将 范围从200 ℃到黄钾铁矾的稳定上限， 钠黄钾铁矾，预计温度低于450 ℃。 此外，本发明还提供了一种方法， 钠和钾在黄钾铁矾之间的分配， 硫酸盐水溶液，D分馏之间的 黄钾铁矾和水的羟基位及18 O分馏 在黄钾铁矾羟基和硫酸盐位点之间， 测定了 这些实验将在标准的 在500巴的压力下的冷密封热液容器是一种 将明矾石的进行中工作扩展到铁-铁轴承 系统 他们应该提高我们解释同位素的能力 酸性硫酸盐蚀变的数据，通常包括 明矾石和黄钾铁矾。 此外，它们将有助于限制 黄钾铁矾的化学和同位素系统学研究 温度，从而补充了正在进行的黄钾铁矾研究 25oC。 对黄钾铁矾性质的进一步认识 在酸性矿山的研究中， 排水，以及自然风化的解释 黄铁矿矿床的氧化作用。