Table of ContentsAdsorption Gold Thiourea & Cation Exchange ResinThiourea ConcentrationThiourea Consumption during Gold Leaching The use of thiourea, (CS(NH2)2 as a complexing/extracting agent for gold and other precious metals has shown promise for implementation in the mining/metals industry. Laboratory testing of this reagent has indicated that a thiourea process for gold extraction has
01-03-1998· Thiourea leaching permitted the recovery of 84% Au after 6 h. Leaching solutions were purified through adsorption onto activated carbon; gold stripping from the carbon has been carried out by hydroalcoholic solutions and the final recovery of the gold from the solutions by means of electrowinning.
4. Conclusions Thiourea leaching permitted the recovery of 84% Au after 6 h. Leaching solutions were purified through adsorption onto activated carbon; gold stripping from the carbon has been carried out by hydroalcoholic solutions and the final recovery of the gold from the solutions by means of electrowinning.
The review of recent literature relating to the use of thiourea as a lixiviant for gold and silver indicates only a modest level of activity and interest. Alkali cyanide leaching system remains the popular choice for treating gold and silver ores. There is some interest in using thiourea as an alternative to cyanide in the processing of high grade
An important development in thiourea technology is the addition of SO2 to the leaching solution. This procedure effectively reduces the decomposition of thiourea and eliminates the problems of passive surface layers that limit the leaching efficiency.
01-02-2011· The leaching of gold in thiourea –thiocyanate solutions has been studied by the rotating-disc technique using ferric sulfate as oxidant. The effects of initial concentrations of ferric, thiourea (Tu) and thiocyanate as well as temperature and pH on gold leaching rates were studied. An initial gold leaching rate in the order of 10− 9 mol cm − 2 s −
J.R. Carvalho. A Portuguese gold concentrate constituted mainly of arsenopyrite was leached with thiourea in sulphuric acid medium.two sets of experiments were carried out to determine the effect
Thiourea extraction was found to be the most effective and a leach plant was commissioned in 1982.An investigation of the leaching with thiourea gave a maximum gold recovery of 89%, with a21 Design of a Process for the Purification of Cobalt by Means of Di-2Ethylhexyl Phosphoric Acid.
Thiourea is used in four main ways: as an intermediate in the production of thiourea dioxide for wool and textile processing (30%), in ore leaching (25%), in diazo papers (15%) and as a catalyst in fumaric acid synthesis (10%); the remainder has smaller areas of use.