Yesica Raquel Quijada-Noriega*, Jesus Leobardo Valenzuela-Garcia*, Maria Mercedes Salazar-Campoy*, Guillermo Tiburcio-Munive, Victor Manuel Vazquez-Vazquez and Jose Refugio Parga-Torres,
{"title":"Gold Extraction from a Refractory Ore Using Calcium Hypochlorite at Moderate Pressure and Temperature before Cyanidation","authors":"Yesica Raquel Quijada-Noriega*, Jesus Leobardo Valenzuela-Garcia*, Maria Mercedes Salazar-Campoy*, Guillermo Tiburcio-Munive, Victor Manuel Vazquez-Vazquez and Jose Refugio Parga-Torres, ","doi":"10.1021/acsengineeringau.4c0003810.1021/acsengineeringau.4c00038","DOIUrl":null,"url":null,"abstract":"<p >Conventional leaching, the standard method for gold extraction, involves using a cyanide solution to dissolve gold from the ore. However, this process is often ineffective for refractory ores due to the presence of sulfide minerals. This study aims to improve the efficiency of gold extraction from refractory ores by introducing an oxidative pretreatment step using a calcium hypochlorite. This compound plays a crucial role in the process as it facilitates the oxidation of the sulfide minerals, mainly pyrite and quartz. The study also investigates how this approach affects oxidation at different temperatures and pressures inside a titanium reactor at 600 rpm. After the pretreatment, the mineral is in contact with a solution of sodium cyanide (1000 ppm) inside a stirred reactor (300 rpm) under atmospheric conditions. Some results obtained were more than 60% extraction of gold, but there were conditions under which gold extraction was less than 40%. The effect of the concentration of calcium hypochlorite 10 and 30 wt % was more significant compared with the temperature (25, 60, and 80 °C) and oxygen pressure (80 and 120 psi). This effect is due to a protective layer confirmed in the characterization using scanning electron microscopy (SEM-EDS) of the solid material previously leached.</p>","PeriodicalId":29804,"journal":{"name":"ACS Engineering Au","volume":"5 2","pages":"89–97 89–97"},"PeriodicalIF":4.3000,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsengineeringau.4c00038","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Engineering Au","FirstCategoryId":"1085","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsengineeringau.4c00038","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Conventional leaching, the standard method for gold extraction, involves using a cyanide solution to dissolve gold from the ore. However, this process is often ineffective for refractory ores due to the presence of sulfide minerals. This study aims to improve the efficiency of gold extraction from refractory ores by introducing an oxidative pretreatment step using a calcium hypochlorite. This compound plays a crucial role in the process as it facilitates the oxidation of the sulfide minerals, mainly pyrite and quartz. The study also investigates how this approach affects oxidation at different temperatures and pressures inside a titanium reactor at 600 rpm. After the pretreatment, the mineral is in contact with a solution of sodium cyanide (1000 ppm) inside a stirred reactor (300 rpm) under atmospheric conditions. Some results obtained were more than 60% extraction of gold, but there were conditions under which gold extraction was less than 40%. The effect of the concentration of calcium hypochlorite 10 and 30 wt % was more significant compared with the temperature (25, 60, and 80 °C) and oxygen pressure (80 and 120 psi). This effect is due to a protective layer confirmed in the characterization using scanning electron microscopy (SEM-EDS) of the solid material previously leached.
期刊介绍：
）ACS Engineering Au is an open access journal that reports significant advances in chemical engineering applied chemistry and energy covering fundamentals processes and products. The journal's broad scope includes experimental theoretical mathematical computational chemical and physical research from academic and industrial settings. Short letters comprehensive articles reviews and perspectives are welcome on topics that include:Fundamental research in such areas as thermodynamics transport phenomena (flow mixing mass & heat transfer) chemical reaction kinetics and engineering catalysis separations interfacial phenomena and materialsProcess design development and intensification (e.g. process technologies for chemicals and materials synthesis and design methods process intensification multiphase reactors scale-up systems analysis process control data correlation schemes modeling machine learning Artificial Intelligence)Product research and development involving chemical and engineering aspects (e.g. catalysts plastics elastomers fibers adhesives coatings paper membranes lubricants ceramics aerosols fluidic devices intensified process equipment)Energy and fuels (e.g. pre-treatment processing and utilization of renewable energy resources; processing and utilization of fuels; properties and structure or molecular composition of both raw fuels and refined products; fuel cells hydrogen batteries; photochemical fuel and energy production; decarbonization; electrification; microwave; cavitation)Measurement techniques computational models and data on thermo-physical thermodynamic and transport properties of materials and phase equilibrium behaviorNew methods models and tools (e.g. real-time data analytics multi-scale models physics informed machine learning models machine learning enhanced physics-based models soft sensors high-performance computing)
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
