Decontamination of Soil Containing Residual Mercury from Mining Operations

采矿作业中残留汞土壤的净化

• 批准号: 9800643
• 负责人: Quintus Fernando
• 金额: $ 10万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 2000-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9800643&HistoricalAwards=false
• 关键词: Decontamination; Soil; Containing; Residual; Mercury

9800643 Fernando This is an award to provide support for research on minimizing the environmental impact of a process for decontamination of soil that had been contaminated by use of mercury in extracting gold and silver from ores mined in the United States and Mexico. The work involves collaboration with Dr. Tetsuya Ogura of the Autonomous University of Guadalajara in Mexico on soils obtained from contaminated sites in Zacatecas, Mexico. The process currently in use there involves treatment of soil contaminated by these metals with an aqueous solution of calcium thiosulfate produced by passing sulfur dioxide through an aqueous suspension of lime and elemental sulfur. The resultant solution of metal contaminants is contacted with metals that precipitate elemental mercury containing amalgamated gold and silver which can be extracted from the amalgam by heating it to vaporize the mercury. Process control is important to avoid its potential pollutional impact on air, water and soil. Results of this project are expected to provide knowledge as to how the process being studied can be designed and conducted to obtain its benefits and minimize its potential negative environmental impact. Research will also identify the advantages and disadvantages of the process over currently available alternative technologies for removing mercury from soil. This project is being partially supported through a program of collaboration with the Nacional de Ciencia y Tecnologia (CONACyT) of Mexico.***

9800643 Fernando该奖项旨在为研究提供支持，以最大限度地减少在美国和墨西哥开采的矿石中提取金和银时使用汞污染土壤的净化过程对环境的影响。 这项工作涉及与墨西哥瓜达拉哈拉自治大学的Tetsuya Ogura博士合作，研究从墨西哥萨卡特卡斯受污染场地获得的土壤。 目前在那里使用的方法包括用硫代硫酸钙水溶液处理被这些金属污染的土壤，所述硫代硫酸钙水溶液是通过使二氧化硫通过石灰和元素硫的水悬浮液而产生的。 将所得的金属污染物溶液与沉淀出含有汞齐金和银的元素汞的金属接触，可通过加热汞齐使汞蒸发而从汞齐中提取汞。 过程控制对于避免其对空气、水和土壤的潜在污染影响非常重要。该项目的结果预计将提供有关如何设计和实施正在研究的工艺的知识，以获得其效益并尽量减少其潜在的负面环境影响。 研究还将确定该工艺相对于现有的去除土壤中汞的替代技术的优缺点。 该项目得到了与墨西哥国家科学技术委员会（CONACyT）合作方案的部分支持。