Pyrite concentrates with refractory gold and silver were roasted at different temperatures to improve the recovery of metals by cyanide leaching. Scanning Electron Microscope characterization calcine revealed that occluded in pyrite less than one micron, roasting produced channels concentrate, exposing particles leaching solution. Gold recoveries maximum temperature range 500-600?C due high sur...

The article discusses four alternative cyanide substitutes for the recovery of gold from ores and concentrates. Cyanide has been premier leach reagent over 100 years due to its high recovery, low cost reliability. However, environmental damage improper management led widespread research aimed at identifying developing less toxic leaching agents. most widely researched substitutes, but it is cle...

Red mud is a kind of solid waste produced in the process aluminum extraction. Traditional methods red treatment, such as open-pit accumulation and chemical recovery, are costly environmentally hazardous. Gold tailings industrial by-products gold mining refining. In this study, NaOH, KOH, Na2SiO3 were used activators, their effects on properties ternary cementitious composite containing blast fu...

because of high cost of drilling and analysis of samples, it needs to predict gold and silvers based on pathfinder such as as, sb, cd, pb and zn and decrease the cost and time exploration project implementation. in this paper, the model based on a multilayer perceptron artificial neural network (mlp-ann) optimized by invasive weed optimization algorithm (iwo) to predict of gold and silver in za...

The recovery of gold by ore leaching is influenced by the size of the particles and the chemical environment. The effect of particle size on the dissolution of gold is usually studied using mono-size particles as the gold in solution comes from the ore of a unique leached particle size. This paper proposes a method to estimate the gold dissolution as a function of particle size using a bulk ore...

The paper describes a small full-scale plant based on the Gold-REC 1 process, designed and patented by University of L’Aquila; hydrometallurgical process allows treatment printed circuit boards (PCBs). first step is mechanical to reduce size scraps below 2 mm. extraction base metals occurs in reactor sulfuric acid/hydrogen peroxide solution. After filtration, solid leached again with thiourea f...

Gold price forecast is of great importance. Many models were presented by researchers to forecast gold price. It seems that although different models could forecast gold price under different conditions, the new factors affecting gold price forecast have a significant importance and effect on the increase of forecast accuracy. In this paper, different factors were studied in comparison to the p...