摘要：

针对含As试样开展熟料煅烧实验、浸出实验、连续提取实验及能谱分析(SEM-EDS)，以重金属浸出特性及化学形态为指标，考察As在熟料煅烧过程以及水化过程的迁移特性及固定机理。结果表明，煅烧过程中As的固定率较高，大于60%，As在熟料的主要矿物相C₃S中的含量范围为0.4%～0.6%，As和Fe有很强的依存关系，煅烧过程中As生成了稳定的化学形态AsCr_xFe_y

Abstract:

The arsenic contained reagent was added to the cement raw meal to produce clinkers.Leaching test, sequential extraction procedures and SEM-EDS analysis were employed to evaluate the migration characteristics and the mineralogy change of arsenic during the sintering and hydration process.The results show the retention rate of arsenic during the sintering process is higher than 60%, while the content of arsenic in C₃S, the major mineral phase in clinker was only 0.4%—0.6%.The SEM-EDS analysis of clinkers show arsenic has a strong dependent relationship with Fe.XRD analysis of clinkers showed the complex compounds with the chemical form of AsCr_xFe_y or AsCr_xV_y were generated during the clinkerisation process, which were more stable under the high pH environment during the hydration process.Leaching test shows that the leaching concentration of arsenic has no considered increase compared to the blank samples.The BCR sequential extraction procedure analysis of the clinkers showed that the exchangeable water and acid-soluble phase of arsenic was only account for 0.01% of the total, while the easily reduced phase of arsenic had the biggest ratio, up to 39.35%.Finally, the residue fraction of arsenic accounts for 25.41% of the total, which show that the co-processing of high arsenic contained waste in the cement kiln has the potential environmental impact.