摘要
各种工业过程中产生的大量含锌铅废物中含有大量的有毒重金属。必须在危险废物处置场所进行处置,这导致处置成本增加。采用强碱浸出的方法回收含锌铅废物中的Zn和Pb,考察了浸出温度、NaOH浓度、液固比(浸提液体积/原料质量)和搅拌速率等工艺参数对Zn、Pb和杂质金属浸出率的影响,得出其最佳工艺条件。在温度为70℃、液固比为13∶1、搅拌速率为800r/min条件下,用5 mol/L的NaOH浸出含锌铅废物,浸出液中Zn和Pb的质量浓度分别达33.47、11.21 g/L,浸出率分别达到94.24%和93.47%。
Large quantities of metal bearing wastes are generated from many industrial processes. Removal of toxic heavy metals at a hazardous waste disposal site is costly but necessary. Series of caustic washing experiments were performed to determine the effects of temperature, concentration of NaOH washing solution, solution/waste ratio and mixing on the extraction rates for Zn,Pb and other metal constituents. The caustic washing, employing a 5 mol/L NaOH solution at a solution/waste ratio of 13 ： 1 in a mixed reactor （stirring rate of 800 r/min） at 70 ℃, resulted in the extraction of 94.24% of Zn and 93.47% of Pb from the waste sample; the spent caustic solution contained 33.47 g/L of Zn and 11.21 g/L of Pb.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2007年第9期697-700,共4页
Environmental Pollution & Control
关键词
锌
铅
碱法浸出
Zn Pb NaOH leaching
