Results 81 to 90 of about 405,346 (229)
Yankuang ceshi, 2020 BACKGROUND The geochemical exploration for gold deposits is based on the accurate determination of gold. The content of gold in geochemical samples is usually at the level of ng/g, which needs to be preconcentrated before determination by inductively ...
WANG Ji-yan +7 more
doaj +1 more source
The effect of organic acids as leaching agents for hydrometallurgical recovery of metals from PCBs
Metalurgija, 2022 The hydrometallurgical treatment, compared to other recycling processes, is of great interest due to its higher efficiency and better economy. In hydrometallurgy, popular agents used in the leaching processes of e-waste include inorganic acids, ammonia ...
M. Lisinska +5 more
doaj
Research progress on non-cyanide leaching of refractory gold ores
工程科学学报, 2019 With the increasing demand for gold and the decreasing of easily treated gold resources, refractory gold ores, which are characterized by low gold recovery and high cyanide consumptions when subjected to direct cyanide leaching, have gradually become the
JIA Yu-juan +3 more
doaj +1 more source
Materials Research Proceedings. Electronic waste (e-waste) is an escalating environmental concern that poses significant risks to human health and ecosystems. Despite its hazardous nature, e-waste is rich in valuable metals, particularly gold (Au), which has a high economic value and
N. M. Noah
semanticscholar +1 more source
Advanced Science, Volume 13, Issue 59, 23 October 2026.Interfacial synergy between carbon cloth and Pt‐free metal/nonmetal catalysts enhances charge transfer, wettability, active site accessibility, and hydrogen bubble release, enabling efficient and durable hydrogen evolution across acidic, neutral, and alkaline media for scalable green hydrogen production.
Syed Mohammed Hubaish +4 more
wiley +1 more source
Aggregate, Volume 7, Issue 10, October 2026.This review surveys COF‐based optoelectronic memristors from structural design to neuromorphic applications, tracing how framework‐controlled states become history‐dependent conductance. It also identifies the mechanism validation, reproducible film processing and addressable array integration needed for practical visual hardware.
Xianglong Dai +2 more
wiley +1 more source
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Spent automotive exhaust catalysts represent the largest secondary resource of palladium (Pd), and their efficient recovery is essential to support the sustainability of Pd‐related industries. Inspired by supramolecular chemistry, a novel calixarene derivative, 5,11,17,23‐tetra‐tert‐butyl‐25,27‐bis[(N′‐hydroxyacetimidamide)ethoxy]‐26,28 ...
Tao Ge +8 more
wiley +1 more source
Leaching of gold and silver from Miller Process dross through non-cyanide leachants
, 1996 Leaching of gold and silver from the Miller Process dross was investigated using non-cyanide leachants. The dross was found to be very refractory to direct leaching with thiourea as well as thiosulphate.
Murthy, D S R +3 more
core +1 more source
Recent Applications of Propylene Carbonate as a Solvent in Sustainable Organic Synthesis
ChemSusChem, Volume 19, Issue 17, 14 September 2026.This review evaluates propylene carbonate (PC) as a non‐toxic green solvent in organic synthesis, highlighting its performance in key reactions including cross‐couplings, asymmetric hydrogenations, peptide synthesis and biocatalysis. Across these processes, PC delivers yields comparable to conventional and alternative green solvents.
Laura G. Aguilar‐Sanchez +1 more
wiley +1 more source
Recovery of Precious Metals from Discarded Mobile Phones by Thiourea Leaching
Materials Science Forum, 2019 The objective of this work was to recover gold and silver from the printed circuit board (PCB) of discarded mobile phones by thiourea leaching. Effects of thiourea concentration, leaching temperature, leaching time, and ferric ion (Fe3+) concentration on
Siu-Hua Chang, S. F. Abdul Halim
semanticscholar +1 more source