NaAc(pH=3)缓冲液浸出焚烧飞灰中重金属的实验研究

Experiment of Leaching Heavy Metal from Fly Ash of Incineration with Buffer Solution of NaAc(pH=3)

采用HCl,HNO3,H2SO4,HAc,NaAc(pH=8 15)和NaAc(pH=3)作为浸取剂,分别对飞灰进行了浸出实验。NaAc(pH=3)浸出效果最好。以NaAc作浸取剂,对不同液固比(L/S)、浸取液浓度、浸出时间和初始pH值实验条件下Pb和Cd的浸出效果进行分析,结果表明浸取剂浓度为0 5mol/L、液固化为10、浸出时间为60min和浸取液初始pH值等于3时对飞灰中的Pb和Cd浸出效果最好。

The experiments of leaching heavy metal from fly ash have been done dividedly with different buffer solution of HCl, HNO3, H2SO4, HAC, NaAC (pH=8.15), and NaAC (pH=3). The results show that NaAC (pH=3) gets the best effects. The experiments of leaching Pb and Cd have also been done with the same buffer solution of NaAC (pH=3) under different conditions of rate of L/S (liquid/solid), concentration, time and the value of pH, the results show that the leaching effects of Pb and Cd are the best when the concentration of buffer solution is 0.5mol/l, and the rate of L/S is 10, and time is 60 minutes, and the value of pH is 3.