摘要
该废催化剂呈不规则凝聚体,比表面积大,重金属Ni占比0.49%,几乎可以全部消解溶出。国标法下Ni浸出浓度为19.862 mg/L,随着浸出液p H值的降低而迅速增加;Ni浸出量随浸出时间的增加而增大,在10 h后逐渐趋于平稳。Na H2PO4、人造沸石、NTA、乙基黄原酸钾四种稳定化药剂对重金属Ni均有较好的稳定化效果,废催化剂表面形貌特征有显著变化,乙基黄原酸钾因螯合作用而稳定化效果最佳。水泥稳定化产物中重金属Ni在酸性下容易浸出,增容比为1.18,高于药剂稳定化。
The waste catalyst has irregular aggregates, large surface area, which accounted for 0. 49% of heavy metals Ni, and could be digested by agent fully. Using the national standard method, leaching concentration of Ni reached 19. 862 mg / L, and increased rapidly with the decrease of agent pH ; Leaching amounts of Ni increased while the time prolonged and stabilized af- ter 10h. Using NaH2PO＋, synthetic zeolite, NTA, potassium ethyl xanthate and cement as stabilizing agent respectively, results show good stabilizing effect on Ni of the four stabilizing agents, the surface of stabilization products changed significantly. The product from potassium ethyl xanthate reached best effect due to chelation. The Ni leached easily from cement stabilized product, and the capacity ratio reached 1.18, which higher than chemical stabilization.
出处
《环境科学与管理》
CAS
2015年第4期63-68,共6页
Environmental Science and Management
基金
南京市科委2012年科技专项(2012S02002)
关键词
含镍废催化剂
危险废物
药剂稳定化
水泥固化
nickel waste catalyst
hazardous waste
chemical stabilization
cement solidification
