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·Extraction of gold and silver in the selective chlorination roasting process of cyanidation tailing Haoyu Li State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization The results show that gold chlorination reaction was controlled by the interfacial chemical reaction and the apparent activation energy was kJ/mol
·Cyanide has been the most widely used process for the extraction of gold from its ores for the past 120 years; however the use of cyanide is under increasing pressure due to its toxicity and consequent deleterious effects on the environment in the event of an unforeseen spill or tailings dam is examined as a potential alternative lixiviant and the status
·refractory carbonaceous gold ore by chlorination roasting process Hong jun WANG 1 Ya li FENG Hao ran LI2 Jin xing KANG1 1 School of Civil and Resources Engineering University of Science and Technology Beijing Beijing 100083 China; material by means of chlorination process using chlorine as a reactive agent And the highest recovery
·To realize the efficient comprehensive utilization of refractory gold ore resources and environmental and economic gold extraction methods this study investigated the optimal chlorine source for the sustained recovery of gold and vanadium from carbonaceous refractory gold ore by chlorination heat treatment During the chlorination roasting process the
·Semantic Scholar extracted view of "Experimental process analysis and mathematical modeling for selective gold leaching from slag through wet chlorination" by Antoneta Filcenco Olteanu et al This study showed the kinetics of gold chlorination leaching from an anode slime complex containing copper silver barium selenium and
·The chlorination leaching of gold one of the non cyanide methods has the advantages of higher reaction rate less pollution simple process and low cost compared with the cyanide leaching In this work the hydro leaching method consisting of the pressure oxidation pretreatment and chlorination leaching has conducted for the refractory gold
·Chlorination Concept Electronic Encyclopedia of Gold in Australia e Gold is a biographical bibliographical and archival database that tells the story of gold through images stories and multimedia interactives connecting individual stories to wider historical themes
·This gold concentrate is a typical refractory gold concentrate with the gold leaching rate of % and % in direct cyanidation and chlorination respectively The effect of the desulfurization and arsenic removal in pressure oxidation pretreatment on gold leaching in chlorination is investigated experimentally
·A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent
DOI / Corpus ID 228929249; Cleaner process Efficacy of chlorine in the recycling of gold from gold containing tailings article{Li2020CleanerPE title={Cleaner process Efficacy of chlorine in the recycling of gold from gold containing tailings} author={Haoyu Li and Jinhui Peng and Hailin Long and Shiwei Li and Libo Zhang} journal={Journal of
·A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent The effects of roasting temperature roasting time and NaCl content on the volatilization rates of gold and zinc were investigated
The Miller Chlorination Process is employed to upgrade the gold bullion to % purity Subsequent to the Miller refining process gold electrolysis is employed to produce % pure gold for the production of gold bars granules and coins Rand Refinery also utilises a Wet Chemical Refining Plant for high purity gold material
·The feasibility to recover the gold present in alluvial material by means of a chlorination process using chlorine as a reactive agent has been studied Dunn 1982 Dunn et al 1991 have extracted gold by chlorination using pyrometallurgical processes at temperatures lower than the ones mentioned above from refractory minerals and
·Thermodynamic calculation of gold leaching chlorination leaching system were performed E pH diagram lg[Au III ] pH diagram and lg[Cl ] pH diagram of Au Cl H 2O system were drawn respectively
·1 Removal of impurity elements Available global technologies for gold refining Miller process Separation of silver and other metals from gold by treating with gaseous chlorine was known in the early 1800 s The process was suggested in 1838 by Louis Thompson but was first patented and implemented in 1865 by Francis Bowyer Miller at the
·With calcium hypochlorite for chlorination leaching under suitable conditions of calcium hypochlorite adding amount 8% chlorination temperature 333 K and chlorination time 2 h gold was
·In this work a new chlorination roasting process for the extraction of precious metals gold and silver from the CT was attempted Chlorination process harness the feature of low boiling point and high volatile of metal chlorides It demonstrates that CaCl 2 as a chlorination reagent effectively break small particles and release gold [22
Fig 1 Various gold extraction process for free milling and refractory ores Haque 1987 1 Haque 1987 " Gold Leaching from Refractory Ores Literature Survey " Mini Process
Chlorination was applied widely in gold processing throughout the 1800s as vat and barrel leaching with chlorine gas acting as an oxidant In the early 1900s hydrometallurgical gold process technology changed from chlorination to cyanidation which replaced chlorination as the predominant gold leaching process due to technical and financial advantages
·The alternative process selected chlorination may allow the sustainability of gold extraction both for environmental reduction of reagents and waste toxicity and economical aspects high capital investment related to electrolytic cell purchase cost it should be possible to reduce the cost of storage of dangerous materials waste
2 ·The Wilfley table quickly earned its reputation as the best gold recovery method devised before mills began using chlorine cyanide and glycerides to concentrate the gold The chlorination process probably first used in New Zealand in 1889 might have been developed as early as the 1870s Mills in the United States adopted it in 1891
The direct chlorination of a pure gold was also studied up to a temperature of 1223 K These experiments demonstrated that the precious metal is not attacked at that temperature in agreement with the literature which indicates that the reaction of direct chlorination of gold is produced at high temperatures Panias and Neou Syngouna 1990
