The present paper is focused on the extraction of gold from high-grade e-waste, i.e., spent electronic connectors and plates, by leaching electrowinning. These are usually made up an alloy covered a layer gold; sometimes, in some them, plastic part also present. applied system consisted acid solution diluted sulfuric (0.2 mol/L) with thiourea (20 g/L) as reagent ferric sulfate (21.8 oxidant. Th...

several methods have been developed for gold exploration in the past, among which biological base method is known to be the most efficient with least expenses. this method can also be used for latent gold prospects exploration. in the present study, the possibility of applying bacillus cereus frequency in soil as a biological marker was investigated for the exploration of latent gold prospectin...

We demonstrated a real-time monitoring of live cells upon laminar shear stress stimulation via surface plasmon resonance (SPR) in gold nanoslit array. A large-area gold nanostructure consisted of 500-nm-period nanoslits was fabricated on a plastic film using the thermal-annealed template-stripping method. The SPR in the gold nanoslit array provides high surface sensitivity to monitor cell adhes...

Borax gold extraction has been carried out in the Philippines for over thirty years and presently around 15000 small-scale miners (ssm) use the method. Early 2010 the method was successfully tested in the Mbeya region of Southern Tanzania. In Ghana a recently completed EU funded project proved that the borax process worked on Ghanaian gold ores. A very successful teaching and training programme...

In gas adsorption and metal recovery, inexpensive covalently bonded porous polymers offer industrial feasibility, despite the challenge of having reactive functionalities while maintaining porosity. Herein, three highly covalent organic (COPs), COP-210, COP-211, COP-212, with porphyrin that are readily synthesized by a Friedel–Crafts reaction using chlorinated solvents as linkers reported. The ...

the recovery process of selenium from iranian sar-cheshmeh copper anode slimes employing hydrometallurgical methods has been investigated. the copper anode slimes are made up of those components of  the anodes, which are not soluble in the electrolyte. they contain varying quantities of precious metals like gold, silver, selenium and tellurium. they are being extracted as a by product in the co...

Two gold-selective adsorbents were prepared from MCM-41 by grafting amino and thiol groups. The mesoporous silica adsorbents possess higher adsorption capacity for gold compared to activated carbons. The OMSNH2 adsorbent was able to selectively remove and adsorb gold from solutions containing copper. Pure gold was recovered by a simple acid wash and the regenerated adsorbents could be reused. T...

Double refractory gold concentrates were subjected a two-stage microbial process to destroy both sulfides and carbonaceous matter. In the first stage, the well-known sulfide biooxidation process, which utilizes chemolithotrophic bacteria was used to oxidize sulfides and in the second stage carbonaceous matter is destroyed using the bacterium Streptomyces setonii. After biooxidation of sulfides ...

Herein, we demonstrate that highly sensitive conductometric gas nanosensors for H(2)S can be synthesized by electrodepositing gold nanoparticles on single-walled carbon nanotube (SWNT) networks. Adjusting the electrodeposition conditions allowed for tuning of the size and number of gold nanoparticles deposited. The best H(2)S sensing performance was obtained with discrete gold nanodeposits rath...