background and objectives according to islamic doctrines, the use of gold for men has been banned. in general, any advised subject in islam is useful for the body and what has definitely forbidden for a man is definitely harmful for him although its reasons have not been exactly specified. however, muslims believe that there is certainly a sound reason behind this prohibition. this issue was st...

modern hydrometallurgical techniques have been adopted to produce high-purity gold. many extractants were used for the extraction of gold from various synthetic solutions from which dibutyl carbitol (dbc) had a unique superiority. kinetics of process was studied in this paper and the influence of several parameters such as stirring speed, agitation time, impeller type, interfacial area, [aucl4]...

During the storm on 3 and 4 November 2021, Global-scale Observations of Limb Disk (GOLD) mission observed well separated equatorial ionization anomaly (EIA) crests post sunset November, but merged EIA November. We used Whole Atmosphere Community Climate Model-eXtended to simulate structures during two nights. The simulations show which are qualitatively consistent with GOLD observations. Numeri...

the gold mineralization in kurdistan province of iran was classified as shear zone gold type by some of the researchers. in the current study, the geochemical samples collected from the secondary environment, stream sediments, at the sw of saqquez area were used to investigate the geochemical characteristics of the gold mineralized zones in this environment. the multi-variant statistical analys...

Due to current technologies used to extract gold, increasing environmental pollution has occurred. Existing technologies for the extraction and recovery of gold include cyanidation, which uses toxic cyanide. Because of the potential health threat and waste generated by the cyanidation process, an increasing need to develop new technologies to extract and recover gold from aqueous solution has a...

Processing of gold ores with high sulfide minerals is problematic as they consume cyanide and reduce gold leaching. Optimization of gold leaching and cyanide consumption requires a methodology to estimate the amount of exposed cyanicides, their leaching kinetics, and speciation of cyanide complexes that consume the free cyanide and compete with gold. In this paper, a physico-chemical approach i...

This paper studies the influence of process parameters: temperature, the weight of the added precipitant agent, pH and reducing agent on the kinetics of the process of reduction and precipitation of gold of 98.44% purity obtained in the process of electrical and electronic waste recycling. The optimal conditions of reduction and precipitation of colloidal gold particles in the process of re...

Abstract Electronic waste is a dominant global issue with over 50 million tons generated annually. Still, as an amalgamation of precious and rare raw materials, electronic considerable economic resource the most valuable components located on printed circuit boards. Gold widely used in electronics numerous applications, although principally for contact points external connectors. The recovery g...