For securing noble metal resources, recovery of metals from urban mines is a key technology. Recently, ammonium thiosulfate solution has attracted attention as safe and low-cost for gold leaching. We previously reported process using electroless displacement deposition onto silicon powder. In this study, we tried to use powder recover an leaching solution. experimentation, added simulated conta...

There are some 60 gold-mining sites in the Bento Gomes River basin (Mato Grosso), at the border of the Mato Grosso Pantanal (Swamp), where mercury is used to agglutinate fine gold particles through amalgamation. During burning of the amalgam to release the gold, mercury vapor is lost to the atmosphere, since closed systems for mercury recovery are not always used. This study shows the results o...

Recovery following peripheral nerve injuries is often incomplete. The gold standard treatment is surgical nerve repair performed immediately or shortly after injury. To date, there are no additional treatments that are used to enhance functional recovery. In this paper we outline two emerging applications of electrical stimulation to enhance nerve regeneration and functional recovery. The first...

Nowadays, there are many gold leaching processes, and the dominant one is cyanidation, but virulence of cyanidation seriously endangers environment human health. In order to reduce environmental pollution improve recovery rate gold, metallurgical workers put forward a variety new methods, which can be roughly divided into two types: develop pretreatment technology on basis traditional method; T...

For selected patients ventricular assist device explantation is feasible. Freedom from heart transplantation and VAD support for >15 years following VAD removal is possible even if recovery is incomplete and the underlying cause for ventricular assist device implantation was a chronic form of cardiomyopathy. Echocardiography and rightheart catheterization are necessary to assess cardiac recover...

This article lists a number of geological data on the conditions of formation of some major gold deposits in the conglomerates of the Earth's crust. We analyze the metallogenic, tectonic, stratigraphic and other factors controlling the formation of gold-bearing conglomerates in certain fields, such as the Witwatersrand (S. Africa) and Darwaz (Tajikistan). The following tectonic factors play the...

The aim of this study is experimental assay of sensitivity and stability of a bimetallic silver/gold SPR sensor chip. This chip utilizes the sensitivity of the silver and the stability of the gold. Moreover, the Silver layer (instead of usual Cr or Ti layer) was used as an adhesive intermediate layer between the Gold layer and the glass substrate. The optimization of the Gold/Silver thickness u...

In this study, the biosynthesis of gold nanoparticles by Penicillium chrysogenum, isolated from Ahar copper mine, was investigated. The gold nanoparticles were synthesized by reducing the aqueous gold ions using the culture supernatant of the filamentous fungi. The UV–vis spectrum displayed a characteristic peak at 532 nm that is very specific for gold nanoparticles. The XRD spectrum confirmed ...