热解油基钻屑资源化利用(Ⅰ):废渣基固化剂固化实验研究

Resource Utilization of Pyrolyzed Oil Cuttings(Ⅰ):Study on Solidification of Oil Cuttings with Waste-slag Solidifier

针对油基钻屑热解吸处理过程中产生的危险废物残渣,采用废渣基固化剂CS对其进行了固化处理。考察了CS掺量对固化体无侧限抗压强度、水稳性、抗冻性和污染物浸出特性的影响,并利用XRD、SEM和MIP等测试方法,讨论了固化剂对热解油基钻屑的固化机理。结果表明:CS作为固化剂固化热解油基钻屑,其抗压强度及水稳系数(大于0.87)均优于参比样(掺水泥固化体);冻融循环15次后,掺CS热解油基钻屑固化体仍能保持较高的强度值,试件质量损失较小且完整性良好;CS掺量为6%~15%时,热解油基钻屑固化体浸出液成分达到GB 8978-1996Ⅰ级的要求;CS固化处理后,热解油基钻屑固化体中生成了大量C-S-H凝胶和少量AFt,使其基体结构更为致密,明显提高了固化体抗压强度、水稳性和抗冻性,同时能抑制热解油基钻屑中污染物的浸出。

Hazardous and waste residue resulted from pyrolyzed oil cuttings were solidified with a waste-slag solidifier CS.Laboratory studies have been conducted on the effect of the amount of CS on the unconfined compressive strength,water stability,frost resistance and the characteristics of the leached pollutants of the solidified cuttings.Using XRD,SEM and MIP,the solidification mechanisms of the prolyzed oil cuttings with solidifiers were studied.It has been discovered that prolyzed oil cuttings solidified with CS had higher compressive strength and coefficient of water stability(0.87)than those of the reference samples.After alternate freezing and thawing for15times,the solidified prolyzed oil cuttings treated with CS still had higher compressive strength,lower mass losses and good integrity.Leached liquids from the prolyzed oil cuttings treated with solidifiers containing6%-15%CS conforms to the class I requirement of the standard GB8978-1996.After the solidification treatment,there were large amount of C-S-H gels and small amount of Aft in the solidified cuttings,making them much denser.The solidified cuttings have higher compressive strength,better water stability and frost resistance,and the leaching of pollutants from the prolyzed oil cuttings is also inhibited.