Leaching of cuprite through NH_4OH in basic systems

作     者：A.ARACENA F.PéREZ D.CARVAJAL A. ARACENA;F. PéREZ;D. CARVAJAL

作者机构：Escuela de Ingeniería QuímicaPontificia Universidad Católica de ValparaísoAvenida Brasil 2162Cod.Postal 2362854ValparaísoChile Instituto de Investigación Multidisciplinar en Ciencia y TecnologíaUniversidad de La SerenaBenavente 9801720170La SerenaChile International Organization for Dew Utilization(OPUR)60 rue EmeriauParisFrance 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2018年第28卷第12期

页      面：2545-2552页

核心收录：

学科分类：080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程] 

主　　题：leaching cuprite ammonium hydroxide copper tetra-amine reaction kinetics 

摘      要：Cuprite is a difficult oxide to leach under acidic conditions(for the maximum extraction of50%).In this research,the feasibility of leaching cuprite in an ammoniacal medium was *** working conditions addressed here were the liquid/solid ratio(120:1-400:1mL/g),stirring speed(0-950r/min),temperature(10-45℃)and NH4OH concentration(0.05-0.15mol/L).In addition,different ammoniacal reagents(NH4F and(NH4)2SO4)were *** experiments were performed in a2L reactor with a heating mantle and a *** most important results were that the maximum leaching rate was obtained at pH10.5,0.10mol/L NH4OH,45℃,4h,850r/min and a liquid/solid ratio of400:1,reaching a copper extraction rate of82%.This result was related to the non-precipitation of copper in solution by the formation of copper tetra-amine (Cu(NH2)4^2+).The liquid/solid ratio and stirring speed were essential for increasing the cuprite *** maximum leaching rate was achieved at higher temperatures;however,significant copper leaching rate occurred at temperatures near the freezing point of water(17.9%over4h).Increasing NH4OH concentration and decreasing particle size increased the cuprite leaching *** two ammoniacal reagents(NH4F and(NH4)2SO4)had low extraction rate of copper compared with *** kinetic model representing cuprite leaching was a chemical reaction on the *** order of the reaction with respect to the NH4OH concentration was1.8,and it was inversely proportional to the radius of the ore *** calculated activation energy was44.36kJ/mol in the temperature range of10-45℃.