(1. 華北理工大學(xué) 礦業(yè)工程學(xué)院，唐山 063009；
2. 華北理工大學(xué) 河北省礦業(yè)開發(fā)與安全重點(diǎn)實(shí)驗(yàn)室，唐山 063009)
摘 要: 采用單因素浸出試驗(yàn)對(duì)含鋅塵泥中鋅的浸出動(dòng)力學(xué)進(jìn)行研究，并探討硫酸濃度、液固比、攪拌速度、反應(yīng)溫度等因素對(duì)鋅浸出率的影響。結(jié)果表明：在硫酸濃度為0.5 mol/L，液固比為6:1(mL:g)，攪拌速度為300 r/min，反應(yīng)時(shí)間40 min的條件下，鋅的最終浸出率達(dá)到96.30%；含鋅冶金塵泥在硫酸體系中鋅的浸出過(guò)程符合n=0.16的Avrami動(dòng)力學(xué)模型，浸出反應(yīng)表觀活化能為10 kJ/mol，表明整個(gè)浸出過(guò)程受邊界層擴(kuò)散控制。采用SEM、XRD及EDS表征含鋅塵泥原料以及浸出渣的結(jié)構(gòu)和形貌，結(jié)果表明絕大部分鋅被浸出，而鐵、硅、碳等元素則被留在浸出渣中。
關(guān)鍵字: 含鋅塵泥；鋅；酸浸；浸出動(dòng)力學(xué)
（1. College of Mining Engineering, North China University of Science and Technology, Tangshan 063009, China;
2. Hebei Province Mining Industry Develops with Safe Technology Priority Laboratory, Tangshan 063009, China）
Abstract:A novel method for leaching zinc from low grade zinc-bearing dust in sulfuric acid solutions was proposed by single factor leaching experiment. The influences of sulfuric acid concentration, liquid-solid ratio, stirring speed and leaching temperature on the zinc extraction were discussed. The results show that, under the conditions that sulfuric acid concentration of 0.5 mol/L, liquid-solid ratio of 6 mL:1 g, stirring speed of 300 r/min and leaching time of 40 min, the zinc extraction reaches 96.30%. The results of leaching kinetics indicates that the leaching process is controlled by the interface transfer and diffusion through the product layer. And when n is 0.16, the gas mud acid leaching process is in accordance with Avrami dynamic model, the apparent activation energy is 10 kJ/mol. Using SEM, XRD and EDS, the characterization of zinc-bearing dust raw materials and the structure and morphology of leaching residue were studied. The results show that most of zinc is leached, iron, silicon, carbon and other elements are in the leaching residue.
Key words: zinc-bearing dust; zinc; acid leaching; leaching kinetics
