化工进展2017，Vol.36Issue(7)：2660-2666,7.DOI:10.16085/j.issn.1000-6613.2016-2331
高炉矿渣-粉煤灰地聚合物胶凝材料固化砷钙渣
Solidification/stabilization of calcium arsenate waste with blast furnace slag and fly ash geopolymer materials
摘要
Abstract
Blast furnace slag and fly ash were utilized as raw materials for the preparation of geopolymer from industrial wastes.After that,calcium arsenate waste was solidified/immobilized with blast furnace slag and fly ash geopolymer materials as well as addition of compound chemical activators.Moreover,the mechanism for the solidification/stabilization of calcium arsenate waste with blast furnace slag and fly ash geopolymer materials by exploring the cementitious matrices using X-ray powder diffraction (XRD),Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM).The results showed that the optimum combination of the solidified sample was the mass ratio of blast furnace slag,fly ash and calcium arsenate waste =4 ∶ 2 ∶ 4 as well as addition of compound chemical activators (NaOH and industrial water-glass mixture) 1.5％-2.0％.The arsenic concentration of the leachate from the solidified forms was lower (0.5-0.9 mg/L) than the national standard (i.e.,5mg/L).The results of XRD,FTIR and SEM showed that the sparingly soluble CaHAsO4·3H2O transformed into more stable Ca5(AsO4)3OH orthe isomorphous Ca5(AsO4)3 (OH,F) compounds at the pH of cementitious system over 13 when calcium arsenate waste solidified with blast furnace slag and fly ash geopolymer materials.Meanwhile,the hydration products of blast furnace slag and fly ash geopolymer materials consolidated with other components in the solidified body to form a stable whole,decreasing eventually the arsenic leachability of the solidified sample.Based on these results the blast fumace slag and fly ash geopolymer materials may be considered as a potential material to solidify arsenic-containing wastes.关键词
砷钙渣/地聚合物胶凝材料/固化/高炉矿渣/粉煤灰Key words
calcium arsenate wastes/geopolymer materials/solidification/immobilization/blast furnace slag/fly ash分类
资源环境引用本文复制引用
刘守庆,罗中秋,和森,周新涛,贾庆明..高炉矿渣-粉煤灰地聚合物胶凝材料固化砷钙渣[J].化工进展,2017,36(7):2660-2666,7.基金项目
NSFC-云南联合基金(U1137604)、云铜校企预研基金2015YT08)、昆明理工大学引进人才科研启动基金(KKSY201605021)及昆明理工大学分析测试基金(2016T20160009)项目. （U1137604）
