Preparation of Nano Gold Powder from an Acid Leaching Tail Solution

摘要：

According to the unique properties and many applications of nano gold powder, it was prepared from an acid leaching tail solution. The low value residual gold ions were existed in acid leaching tail solution in Mouteh gold mine in Iran with fellow heavy metals as pollutants (Fe2+, Cu 2+, and Zn2+).Preparation of nano gold particles is achieved by two steps. First, by addition of ammonia as separation step and second using suitable reagents for precipitation/extraction step. Conditions control includes pH, residence time, temperature, agitation, and molar ratio of reducing agents to reagents. The optimum results show that nano gold powder was prepared by temperature of 250 ℃,urea to gold molar ratio of 3:1, and reduction time of 20 min. Also, heat treatment improves dispersion of nano sized gold particles. The properties of gold nano powders were evaluated by SEM, A.A,and UV- Vis spectroscopy methods. The size of prepared particles were about 80nm to 90nm.

关键词： Nano gold powder Leaching tail Urea Precipitation

作者: M. Kargar Razi M. Khosravi R. Sarraf Mamoory M. Mohammadi

作者单位: Azad Univ,, North Tehran Branch, Iran Tarbiat Modares University. Tehran, Iran Mouteh Gold Complex, Iran

会议类型: 国际会议

会议名称: XXIV International Mineral Processing Congress(第24届国际矿物加工大会)

会议地点: 北京

会议语种:英文

页码: 3207-3212

在线出版日期: 2008-09-24（万方平台首次上网日期，不代表论文的发表时间）