The recovery of valuable metals from jarosites is a topic great relevance regarding the implementation circular economy; however, these materials also contain such as arsenic and lead, which are harmful to health environment. Considering factors, it important monitor at each stage treatment used recover metals. In present work, behavior As Pb was assessed during pretreatment conducted on jarosi...

Precious metals are currently associated with selenium (naumannite, Ag2Se) and tellurium (calaverite, AuTe2; sylvanite, (Au,Ag)2Te4) to form species refractory to cyanidation. The aim of this preliminary work was to study the use of the solvent extraction technique to recover tellurium and selenium ions from a synthetic solution similar to the cyanidation effluents to recycle the free cyanide b...

Since its advent at the end of nineteenth century, cyanide processing facilitated intensification and global expansion industrial gold mining. Today, there are important indications that artisanal small-scale mining (ASGM) is on verge a similar revolution: while ASGM typically associated with mercury-based processing, mercury amalgamation increasingly replaced with, or complemented by, cyanidat...

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 ...

Among the methods of preliminary opening refractory gold before sorption cyanidation, technology bacterial oxidation is widely used today. Although this has many advantages, specialists most enterprises around world using are faced with problem foaming in bio-oxidation reactors. This article discusses possibility oxidative roasting processing foam product process flotation concentrate a separat...

Due to the increasing concerns over the emission of sulfur dioxide from roasting and smelting, there has been an increased interest in pressure oxidation as a means of treating gold bearing ores and concentrates. One of the problems with the partial oxidation of the sulfide host matrix to form elemental sulfur is that sulfur containing streams are difficult to treat using cyanidation. In the pr...