CAJ | 학술논문

采用碱性Na2EDTA溶液从次氧化锌烟灰中回收铅。探讨温度、浸出时间、Na2EDTA浓度和起始NaOH浓度对铅、锌浸出率的影响。得到最优实验条件如下：液固比5：1 mL/g、搅拌速度650 r/min、Na2EDTA浓度0.12 mol/L、NaOH初始浓度0.5 mol/L、温度70°C、浸出时间120 min。在最优实验条件下，铅、锌、氟和氯的平均浸出率分别为89.92%、0.94%、62.84%和90.02%。浸出液用于电沉积铅粉。在温度为60°C、电流密度为200 A/m2、H3PO4浓度为1.5 g/L、铅离子浓度不低于5 g/L时，电沉积铅粉平均电流效率大约为93%，阴极铅纯度高于98%。电沉积1 kg铅粉大约消耗0.218 kg Na2EDTA和0.958 kW·h电能。
채용감성Na2EDTA용액종차양화자연회중회수연。탐토온도、침출시간、Na2EDTA농도화기시NaOH농도대연、자침출솔적영향。득도최우실험조건여하：액고비5：1 mL/g、교반속도650 r/min、Na2EDTA농도0.12 mol/L、NaOH초시농도0.5 mol/L、온도70°C、침출시간120 min。재최우실험조건하，연、자、불화록적평균침출솔분별위89.92%、0.94%、62.84%화90.02%。침출액용우전침적연분。재온도위60°C、전류밀도위200 A/m2、H3PO4농도위1.5 g/L、연리자농도불저우5 g/L시，전침적연분평균전류효솔대약위93%，음겁연순도고우98%。전침적1 kg연분대약소모0.218 kg Na2EDTA화0.958 kW·h전능。
The selective recovery of lead from the zinc oxide dust using an alkaline Na2EDTA solution was investigated. The effects of temperature, leaching time, Na2EDTA concentration and initial NaOH concentration on the leaching rates of lead and zinc were studied. The following optimized leaching conditions were obtained: liquid-to-solid ratio 5:1 mL/g, stirring speed 650 r/min, Na2EDTA concentration 0.12 mol/L, initial NaOH concentration 0.5 mol/L, leaching temperature 70 °C, leaching time 120 min. Under the optimized conditions, the average leaching rates of lead, zinc, fluoride and chloride are 89.92%, 0.94%, 62.84% and 90.02%, respectively. The filtrate was used to electrowin lead powders. The average current efficiency of electrowinning is about 93% and lead content is higher than 98% under the conditions of temperature of 60 °C, current density of 200 A/m2, H3PO4 concentration of 1.5 g/L, and lead ion concentration of above 5 g/L. The consumption of Na2EDTA and the direct current are about respectively 0.218 kg and 0.958 kW·h for per kilogram of lead powder.