摘要
提出了超富集植物的"焚烧→湿法提取与净化→电化学沉积/化学沉淀法→金属/化工产品"工艺。以镍的超富集植物Berkheya coddii为例,对该收获物进行焚烧处理后,对焚烧产物进行氨法浸出,对浸出液进行一定处理后直接进行电积镍,最终得到高纯镍板(99.999%),该工艺既实现了对超富集植物收获物的去毒化处理,又实现了收获物中有价金属的回收。对于浸出实验,优化实验条件分别为:浸出温度60℃,氯化铵及氨水的摩尔比(n(NH4Cl):n(NH3))0.6,液固比(L/S)5:1,浸出时间2h;对于镍电积实验,优化实验条件为:ρ(Ni2+)浓度23g/L,极距3.5cm;电流密度200A/m2,温度40℃。
The leaching and electrowinning of nickel from Berkheya coddii biomass was studied according to incineration→ohydro-extraction and purification→electrodeposition→Metal/product flowsheet, and ammonia-ammonium chloride solution was used as leaching agents. The research was carried out in two phases, which are a leaching study to determine nickel extraction efficiency of this leaching agent, and an electrowinning study to determine nickel electrodeposition efficiency from the filtrate. The results show that leaching temperature has the most dominant effect on the metal extraction performance, followed by mole ratio of NH4Cl to NH3, liquid-solid ratio and leaching time. Accordingly, the optimum leaching conditions are that temperature of 50℃, n（NH4C1）：n（NH3）=0.6, leaching time of 2 h and L/S=5：1. The total nickel removal after leaching under optimum condition reaches to 97.61%. The optimum conditions of nickel electrodeposition experiments are obtained as p（Ni2＋） of 23 g/L, polar distance of 3.5 cm, current density of 200 A/m2 and temperature of 40 ℃, and the ultimate nickel content in the as-synthesized nickel plate is more than 99.999%.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2009年第4期754-759,共6页
The Chinese Journal of Nonferrous Metals
基金
国家高技术研究发展计划资助项目(KY20080577000002)
国家自然科学基金资助项目(50804056
50774099)
中国博士后基金资助项目(20080431028)
