回转窑热解处理废锌锰电池试验研究

Research on pyrolysis of spent alkaline zinc manganese dioxide batteries in a rotary kiln

利用回转窑装置热解处理废锌锰电池,考察了热解温度、热解时间和载气流速对热解脱汞效果的影响,研究了汞被吸收的规律、尾气的成分以及废锌锰电池的物质形态变化。研究结果表明:在热解温度为690℃,热解时间为100m in,载气流速为0.06 m3/h的条件下脱汞效果最好。热解时间对脱汞效果影响最大,热解温度次之,载气流速的影响很小。吸收液能完全吸收通过吸收瓶的尾气中含有的汞,其中95%以上的汞以单质形式存在。热解残渣中晶态物质多,金属元素呈低价态。

Pyrolysis characteristics of the spent alkaline zinc manganese dioxide batteries in a bench scale rotary kiln were studied under different conditions. The effects of temperature, residence time and flow rate of carrier gas on Hg removal rate were investigated. The law of the Hg absorption,the content of the tail gas and the form change of the spent Zn/MnO2 batteries were investigated. The most efficient condition is： temperature 690 ℃ ,residence time 100 min, flowrate of carrier gas 0.06 m^3/h. The most influential factor is residence time. The less influential factor is temperature. Flowrate of carrier gas has a footy factor on Hg removal rate. The absorption solution absorbs almost all the Hg in the tail gas. Approximately 95% of the Hg absorbed in the absorption solution is simple substance. Much crystalline solid is found in the pyrolysis residue. The metallic element is low valent.