Preparation of Nano Silver Powder from Acid Leaching Tail in Gold Room
According to the unique properties and many applications of nano silver powder, it was prepared from acid leaching tail solution. The low value residual gold and silver ions were occurred with fellow heavy metals as pollutants (Fe2+, Cu 2+and Zn2+) in acid leaching tail solution in Mouteh gold mine in Iran.Preparation of nano silver particles was achieved in two steps: first, by addition of ammonia as separation step and second by using different reagents as precipitation and extraction steps. Different controlled parameters were including pH, residence time and temperature, mixing time, and reducing reagents to metals molar ratio. Acid leaching process was carried out with sulphuric and nitric acid via suitable reductants. In order to remove copper, zinc, and silver ions from solution, all of the conditions were controlled. The optimum conditions for preparation of nano silver powder with less than 90 nm were pH 10.5, hydrazine/methanol to silver molar ratio of 3 to 4, and reduction time of 5 min in 45 ℃. The results were evaluated via SEM, A.A and UV- Vis spectroscopy analytical methods.
Nano silver powder Acid leaching tail solution Hydrazine Methanol
M. Kargar Razi S. Azadi Sh.Moradi R. Sarraf Mamoory
Azad Univ., North Tehran Branch, Iron Tarbiat Modares Univ., Tehran, Iran
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3255-3261
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）