固体废弃物基地聚合物固化/稳定重金属研究
首发时间:2012-03-26
摘要:利用固体废弃物高钙粉煤灰研制地聚合物来固化/稳定重金属,采用静态浸出试验和动态浸出试验研究了高钙粉煤灰地聚合物对重金属的固化/稳定效果,并进一步探索了重金属的迁移机制和长期安全性。研究表明:高钙粉煤灰地聚合物分别固化/稳定0.025%的铅,0.025%的铬和0.01%的汞后,经静态浸出试验,重金属浸出浓度远低于规定的上限值,且固化率均在98%以上。经动态浸出试验,重金属的实时浸出浓度低于规定的上限值,累积浸出浓度在72h后趋于稳定;固化体中重金属的径向分布相似。
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SOLID WASTES BASED GEOPOLYMER SOLIDIFICATION/STABLIZATION OF HEAVY METALS
Abstract:Utilization of solid waste of high calcium fly ash geopolymer to solidify/stabilize heavy metals was explored. The solidification/stabilization effectiveness of heavy metals was studied using static and dynamic leaching experiments. Additionally, transferring mechanism and long-term safety of heavy metals in geopolymer were also explored. Static leaching experiment results showed that the leaching concentrations of heavy metals from the solidified/stabilized matrix were far lower than the limit values, and all the solidified/stabilized ratios of heavy metals reached 98% when the geopolymer solidified/stabilized 0.025% Pb(II), 0.025% Cr(VI), and 0.01% Hg(II), respectively. Dynamic leaching experiment results showed that real-time leaching concentrations of heavy metals were lower than allowable maximum values, and the accumulated leaching concentrations became stable after 72 h. After dynamic leaching experiment, the radial distributions of heavy metals in geopolymer specimens were similar.
Keywords: high calcium fly ash geopolymer heavy metal leaching concentration transferring mechanism
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