Results 71 to 80 of about 405,346 (229)

A comparative study of cyanide and thiourea-oxalate leaching from Sinaloa gold ore

MRS Advances
The State of Sinaloa, in Mexico, has significant gold deposits, which are exploited by artisanal miners using mercury. This process is dangerous, inefficient, and restricted, limiting gold recovery (30%) and excluding the extraction of silver and other ...
D. Calla-Choque, J. E. Ballesteros-Urbina   +1 more
semanticscholar   +1 more source

Leaching of gold in acid thiourea-thiocyanate solutions using ferric sulfate as oxidant [PDF]

, 2011
manuscriptThe leaching of gold in ferric-thiourea-thiocyanate solutions has been studied by the rotating-disk technique. The effects of initial concentrations of ferric, thiourea (Tu), thiocyanate, temperature and pH value on gold leaching rate were ...
Yang, Xiyun; Shi, Xichang; Xu, Hui; Moats, Michael S.; Xiao, Xiang; Ma, Liwen, Miller, Jan D.   +1 more
core  

Leaching and CIL processes in gold recovery from refractory ore with thiourea solutions

, 2007
In this study, the applicability of leaching and CIL processes in gold recovery with thiourea method, alternative to the cyanidation from the refractory Gumushane-Kaletas/Eastern Black Sea Region (Turkey) ore was ...
Yildirim, M. E., Gonen, N., Korpe, E., SELENGİL, UĞUR   +3 more
core   +1 more source

Superiority of Thiourea Au Extraction from Low Graphiticity Carbonaceous Gold Ores

Journal of MMIJ
Double refractory gold ores (DRGOs), in which few percentages of carbonaceous matter are present and gold grains are encapsulated in sulfides, have been abandoned to develop due to economic loss caused by adsorption of Au(CN)2− on carbonaceous matter ...
Ikumi SUYAMA, Kojo T.KONADU, Keiko SASAKI   +2 more
doaj   +1 more source

Advanced MXene‐Based Multifunctional Nanoarchitecture Materials Engineered for Adsorptive Cleanup of Hazardous Radioactive Pollutants: A Comprehensive Critical Review

Advanced Materials Interfaces, Volume 13, Issue 19, 6 October 2026.
This work critically reviews MXenes as highly effective multifunctional nanomaterials for the adsorption of radio‐contaminants, demonstrating a remarkable adsorption capacity of up to 1376.75 mg/g and cyclic stability of 2–8 cycles, with complexation, electrostatic interactions, and the numerical strength of MXene active sites playing a key operational
Stephen Sunday Emmanuel, Shepherd M. Tichapondwa   +1 more
wiley   +1 more source

Coordination‐Tuned Iridium Single‐Atom Nanozymes Boost Multienzyme Activity for Colorimetric Sensing

Advanced Science, Volume 13, Issue 55, 5 October 2026.
Breaking the coordination symmetry of Ir single‐atom sites through asymmetric Ir–N3S1 engineering tailors interfacial electron transfer, oxygen activation, and multienzyme‐like catalytic pathways. Operando spectroscopy and theoretical modeling uncover the atomic‐level origin of activity enhancement, providing a strategy for designing multifunctional ...
Tao Li, Xinyu Zhang, Jiashan Xia, Mengyu Wu, Cong Liu, Yapei Sun, Wanjiang Zhao, Min Qian, Wei Wang, Weixia Duan, Shangcheng Xu   +10 more
wiley   +1 more source

1-(2,6-Dichlorobenzoyl)-3-(2,3,5,6-tetrachlorophenyl)thiourea trichloromethane hemisolvate [PDF]

, 2009
The title compound, C14H6Cl6N2OS·0.5CHCl3, crystallizes with four 1-(2,6-dichlorobenzoyl)-3- (2,3,5,6-tetrachlorophenyl)thiourea molecules and two trichloromethane molecules in the asymmetric unit. The thiourea molecules exist in the solid state in their
Bolte, Michael, Rauf, M. Khawar, Saeed Anwar, Anwar, Saeed, Michael Bolte, M. Khawar Rauf   +5 more
core   +1 more source

Rare‐Earth–Sulfur Surface Modification Enables SiC Ceramics for Low‐Frequency Electromagnetic Wave Absorption in Extreme Environments

Advanced Science, Volume 13, Issue 55, 5 October 2026.
By altering surface chemical bonds to prolong relaxation time and shift absorption to lower frequencies, SiC/rare earth–sulfur (RE─S, RE = La, Ce, Pr, Sm, Gd, Er) materials achieve excellent low‐frequency electromagnetic wave absorption under extreme conditions, offering a new direction for designing high‐performance SiC‐based absorbers.
Zhanming Wu, Xiaojun Zeng, Yu‐Nan Tan, Chi Yu, Nuohua Xie, Yanfeng Gao   +5 more
wiley   +1 more source

Extraction of gold from an Indian low-grade refractory gold ore through physical beneficiation and thiourea leaching

, 2003
The work carried out on the processing of a low-grade and refractory gold ore using thiourea is presented. Direct leaching of the “as-received” ore with thiourea has yielded only 16% gold extraction.
Murthy, D S R, Kumar, Vinod, Rao, K V, Kumar, Vinay   +3 more
core   +1 more source

The Recovery of Silver from Thiourea Leaching Solution by Cementation Technique [PDF]

Economic and Environmental Geology, 2013
In order to apply the silver cementation method using Fe powder from pregnant thiourea leaching solution. Parameters such as the amount of Fe powder addition, agitation speed, and temperature were investigated. The silver cementation rate was increased by the increasing of Fe powder addition, agitation speed, and temperature.
Bong-Ju Kim, Kang-Hee Cho, Nag-Choul Choi, Cheon-Young Park   +3 more
openaire   +1 more source