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Publikováno v:
Hydrometallurgy. 188:73-80
This work aims to improve the extraction performance of organophosphorus acid extractants (di-(2-ethylhexyl) phosphoric acid (P204), 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (P507, H2A2), di-(2-ethylhexyl) phosphinic acid (P227, H2B2) and
Autor:
Daniel F.R. Domanski, Oscar G. Olvera
Publikováno v:
Hydrometallurgy. 188:47-53
The catalyzed thiosulfate leach of gold from oxide ores has been evaluated. The addition of fine activated carbon resulted in increased dissolution rates and gold recoveries. It was hypothesized that activated carbon and gold form galvanic couples, a
Publikováno v:
Hydrometallurgy. 188:201-215
Direct leaching of sphalerite has been considered as a cost effective and an environmentally benign alternative to the traditional two-step roasting-leaching approach. Yet the slow leaching rate due to the formation of surface passivating phases rema
Publikováno v:
Hydrometallurgy. 188:140-156
Ore samples contain a variety of copper-bearing and gangue minerals that affect the leach kinetics. The kinetic behaviour of a natural ore sample (that contained 48.7% bornite and 15.8% chalcopyrite) in a solution of methanesulfonic acid and ferric c
Publikováno v:
Hydrometallurgy. 187:54-62
Methanesulfonic acid (MSA) is an organic acid and was used to leach copper from chalcopyrite. MSA is a strong acid with higher solubility of various metals. A suite of leaching tests of chalcopyrite at 75 °C with various lixiviants exhibited that MS
Publikováno v:
Hydrometallurgy. 187:71-80
There are several limitations of thiosulfate leaching methods in its industrial application. The main limitation is the addition of copper and ammonia which act as catalysts in the thiosulfate leaching process. The introduction of cupric ions can acc
Publikováno v:
Hydrometallurgy. 186:50-57
The semiconductor properties of chalcopyrite during leaching in sulfate solutions in the presence of silver have been investigated. A combination of Mott-Schottky plots and potentiodynamic polarisation was used to determine the transformations of the
Publikováno v:
Hydrometallurgy. 186:12-20
The influence of sulfate versus chloride media on the adsorption of rare earth elements (REE) by strong acid and iminodiacetic acid resins was investigated. For the strong acid resin, Lewatit MonoPlus SP 112, the adsorption constants recorded for La,
Publikováno v:
Hydrometallurgy. 185:30-37
High-alumina fly ash is an alumina-rich mineral resource that can potentially replace low-grade bauxite. While a wide range of different traditional processes are available for extracting alumina from high-alumina fly ash, these processes have many d
Autor:
Hong Yu, Qin Xuecong, Yang Peng, Huiling Cheng, Chen Shuliang, Yanhe Nie, Qiang Wang, Xianzhi Hu, Chen Yunlong, Yan Zhang, Futing Zi
Publikováno v:
Hydrometallurgy. 185:102-110
In the present study, sulfur-containing functional groups were grafted onto activated carbon and adsorption behavior for [Au(S2O3)2]3− was studied. Activated carbon grafted with sulfur-containing functional groups (S-AC) was developed with MBT (2-M