垃圾衍生燃料气化后无机底渣制备免烧砖及对重金属的固化

Technology of Non-burned Brick Using MSW RDF Gasification Slag and Solidification of Heavy Metal

在垃圾气化后的无机底渣中添加10%水泥作为粘结剂、不同比例的电石渣作为激发剂设计了10组实验制备免烧砖,以T2处理制备的免烧砖3 d、7 d和28 d的抗压强度均较高,分别为10.5 MPa、19.3 MPa和20.1 MPa,达到了优质砖标准。以T2处理制备的免烧砖,其浸出液重金属浓度值均低于GB3838-2002《地表水环境质量标准》中V类水要求;重金属Pb、Zn、Cu、Cd大多以有机结合态和残渣态存在,有机结合态和残渣态分别占总形态的99.97%、82.93%、89.55%和74.20%。

Ten sets of experiments were designed to process non-burnt bricks by adding 10% of cement as binder and different proportion of carbide slag as activator into municipal solid waste （MSW） gasification and incineration slag. The results showed that： compressive strength at 3 d, 7 d and 28 d of non-burnt bricks compound by T2 were the higher with 10. 5 MPa, 19. 3 MPa and 20. 1 MPa respectively, achieving the high quality standard brick. Besides, leaching concentration of heavy metals were lower than that of GB3838-2002 ＂ environmental quality standard for surface water＂ in V water requirements; heavy metals Pb, Zn, Cu, Cd mostly exist in the organic and residual forms with 99.97%, 82.93% 89.55% and 74.20%. of the total forms, respectively.