化学结合磷酸盐胶凝材料对Pb(Ⅱ)滞留性的研究  

An investigation on the retention characteristics of Pb(Ⅱ) in chemically bonded phosphate cementitious solidification

作　　者：杜采颐[1] 严云[1] 胡志华[1] 

机构地区：[1]西南科技大学材料学院,四川绵阳621010

出　　处：《安全与环境学报》2008年第4期45-48,共4页Journal of Safety and Environment

摘　　要：研究化学结合磷酸盐胶凝材料（CBPC）固化体对Pb^2＋滞留性的影响。在不同Pb^2＋加入量和养护龄期下,测定固化体力学性能,以及浸出溶液的pH值、电导率和Pb^2＋质量浓度,分析CBPC固化体对Pb^2＋的稳定效果。结果表明,不同Pb^2＋加入量下,CBPC固化体均具有较好的早期力学性能,养护1 d的抗压强度超过30 MPa;1 d和3 d龄期的固化体浸出液的pH值约为7.5-8.0、电导率为1.95-3.04ms/cm;浸出液中Pb^2＋质量浓度较小。当Pb^2＋加入量为5%（Pb^2＋加入质量占固体总质量的比例）时,1 d龄期的CBPC固化体浸出液中Pb^2＋质量浓度仅为0.45 mg/L,远低于国标中危险废物的鉴别标准,此时Pb^2＋固化效率超过99.9%。研究表明,CBPC是一种非常有效且稳定的固铅材料。The paper is aimed to provide a new excellent and steady material for solidifying Pb^2＋ as a result of our systematic investigation and experimentation. For the research purpose, we have investigated systematically the heavy metal ion with chemically bonded phosphate cementitious solidification. First of all, stabilization of Pb^2＋ has to be tested to determine the stabilization/solidification of Pb（ Ⅱ ） and find the proper quantity of Pb^2＋ as well as the culturing time as the major factor by using the national standard method. The results of our experiments show that the stream taking Pb^2＋ as an ingredient enjoys good early mechanical properties. When solidified cement product was put into a cultured container after one day＇s cultivation, the compressive strength of the solidified cement product can be expected to rise over 30 MPa, with the PH value of leachate during different culturing times all between 7.5 and 8. However, the conducive rate would not be sensitive to the Pb^2＋ quantity joined. The Pb^2＋ concentration of leachate proves rather low when the quantity of Pb^2＋ to be included is 5% . Its mass concentration in the leachate is only 0.45 mg/L, far from being limited for the request of being hazardous waste according to the national standard. CBPC, however, it has now turned to be an excellent steady material for solidifying Pb.

关 键 词：无机非金属材料 磷酸盐胶凝材料 Pb(Ⅱ) 力学性能 滞留性 

分 类 号：TQ172[化学工程—水泥工业]