摘要
铅冶炼系统入炉物料中含有少量镉,经熔炼炉熔炼后,大部分镉进入烟灰中,烟灰中含镉量为10%~20%。研究采用酸浸法浸出镉,浸出渣返铅冶炼系统,富镉液加入锌粉置换制取海绵镉,置换后液返电积锌系统回收锌。考察了含镉烟灰酸浸时硫酸酸度、反应温度、反应时间、液固比和搅拌速度等因素对镉和锌浸出率的影响。试验结果表明,在硫酸酸度为50 g/L,液固比为5∶1,反应温度50℃,反应时间2.0 h,搅拌速度70 r/min的条件下,含镉烟灰中镉的浸出率为95.24%,镉浸出效果较好。生产实践表明:采用上述最佳试验条件,含镉烟灰中镉和锌浸出率稳定在95%以上,制取的海绵镉纯度95%以上。
There is a small amount of cadmium in the materials in the lead smelting system,and most of the cadmium enters the soot after smelting in the smelting furnace,and the soot contains about 10%~20% cadmium.In this study,cadmium was leached by acid leaching,and the leach residue was returned to lead smelting system.Sponge cadmium was prepared by adding zinc powder to cadmium-rich solution,and zinc was recovered by electrodeposition system after replacement.The effects of sulfuric acid acidity,reaction temperature,reaction time,liquid-solid ratio and stirring speed on the leaching rate of cadmium and zinc were investigated.The results show that under the condition of sulfuric acid acidity of 50 g/L,the liquid-solid ratio of 5∶1,the temperature of 50 ℃,reaction time of 2.0 h,the stirring speed of 70 r/min,the cadmium leaching rate of cadmium-containing soot is 95.24%,cadmium leaching effect is good.Using the above optimum test conditions,the production practice shows that the leaching rate of cadmium and zinc in cadmium ash are stable above 95%,and the purity of cadmium in sponge is above 95%.
作者
王雷
张桧楠
杨国洮
张峰
WANG Lei;ZHANG Huinan;YANG Guotao;ZHANG Feng(Shandong Humon Smelting Co.,Ltd.,Yantai 264109,China;Yantai Key Laboratory of Gold and Copper Concentrate Clean Smelting,Yantai 264109,China)
出处
《绿色矿冶》
2024年第2期51-54,共4页
Sustainable Mining and Metallurgy
关键词
镉烟灰
酸浸法
海绵镉
浸出率
cadmium soot
acid leaching
sponge cadmium
leaching rate
