Development of an environmentally safe gold extraction method from refractory ores using sodium thiosulfate as an extractant
- 1 — Ph.D., Dr.Sci. professor National Mineral Resources University (Mining University)
- 2 — professor Lappeenranta University of Technology
Abstract
The article presents the results of a mathematical model development for the process of gold leaching from gold-containing ores and concentrates. A mathematical model has been developed by analyzing the chemistry of reactions and mass transfer processes. On the base of a kinetic extraction model and a hydrodynamic complete mixing model a mathematical model of thiosulfate leaching process in various types batch reactors, complete mixing flow process vessels and complete mixing reactor columns with different numbers of vessels in a column has been developed. The effect of the number of reactors in a column has been investigated and optimal segmentation conditions have been found. Based on the investigation of the process using the mathematical model a control system structure has been designed to provide maximum conversion at the exit area of a reactor column.
References
- Шариков Ф.Ю. Исследование процесса окислительного выщелачивания золота из концентрата бедной руды с использованием калориметрии Кальве. Постановка задачи и первые результаты / Ф.Ю.Шариков, В.В.Жуков, М.Лампинен // Исследование материалов с использованием методов термического анализа, калориметрии и сорбции газов: Доклады междунар. конференции. СПб: Полторак, 2012. С.59-61.
- Шариков Ю.В. Моделирование систем. Ч.1. Синтез моделей технологических объектов на базе уравнений гидродинамики и химической кинетики / Ю.В.Шариков, И.Н.Белоглазов / СПГГУ. СПб, 2011. 108 с.
- Шариков Ю.В. Моделирование систем. Ч.2. Методы численной реализации математических моделей / Ю.В.Шариков, И.Н.Белоглазов / Национальный минерально-сырьевой университет «Горный». СПб, 2012. 118 с.
- Abbruzzese C. Thiosulphate leaching for gold hydrometallurgy / C.Abbruzzese, P.Fomari, R.Massidda, F.S.Veglio, S.Ubaldini // Hydrometallurgy. 1995. Vol.39. P.265-276.
- Abbruzzese C. Nuove prospettive per il recupero dell'oro dai minerali: la lisciviazione con tiosolfato / C.Abbruzzese, P.Fornari, R.Massidda, S.Ubaldini // Indust. Miner., 1994. Vol.4. P.10-14.
- Bagdasaryan K.A. Kinetics of gold and silver dissolution in sodium thiosulfate solutions. Izv. / K.A.Bagdasaryan, M.L.Episkoposyan, K.A.Ter-Arakelyan, G.G.Babayan // Nonferrous metalls, 1983. Vol.5. P.64-68.
- Breuer P.L. Thiosulfate leaching kinetics of gold in the presence of coper and ammonia / P.L.Breuer, M.I.Jeffrey // Minerals Ingineering, 2000. Vol.13. N 10-11. P.1071-1081.
- Breuer P.L. The reduction of copper(II) and the oxidation of thiosulfate and oxysulfur anions in gold leaching solutions / P.L.Breuer, M.I.Jeffrey // Hydrometallurgy, 2003. Vol.70. P.163-173.
- Senanayke Gamini. Rewiew of rate constants for thiosulfate leaching of gold from ores and flat surfaces: Effect of host minerals and pH // Hydrometallurgy. 2003. Vol.70. P.180-185.
- Umetsu Y. Dissolution of gold in ammoniacal sodium thiosulphate solution / Y.Umetsu, K.Tosawa // Bull. Res. Inst. Miner. Dressing Metall., 1972. Vol.28. P.15-16.
- Zipperian D. Gold and silver extraction by ammoniacal thiosulphate leaching from a crhyolite ore / D.Zipperian, S.Raghavan // Hydrometallurgy. 1988. Vol.19. P.361-375.