浮选药剂油酸对施氏矿物转化及重金属Cr迁移的影响  

Effects of oleic acid on the transformation of schwertmannite and Cr migration

作　　者：于生慧 冯馨怡 王翼远 张蕾 郭军康 YU Sheng-hui;FENG Xin-yi;WANG Yi-yuan;ZHANG Lei;GUO Jun-kang(School of Environmental Science and Engineering,Shaanxi University of Science&Technology,Xi’an 710021,China)

机构地区：[1]陕西科技大学环境科学与工程学院,陕西西安710021

出　　处：《中国环境科学》2024年第2期768-780,共13页China Environmental Science

基　　金：国家自然科学基金资助项目(41702038);陕西省自然科学基金资助项目(2019JM-375);陕西省科技创新团队项目(2022TD-09);陕西省重点产业链项目(2022ZDLNY02-02)。

摘　　要：采用快速化学法合成施氏矿物(Sch)和含Cr施氏矿物(Cr-Sch),并通过批量实验法,系统研究油酸浓度和pH值对Sch转化进程及转化过程中Cr的迁移.研究表明,油酸钠能够显著抑制Sch的溶解—转化进程,油酸根与Sch溶解所释放的Fe离子结合为络合物或沉淀附着于Sch表面,抑制转化的进行;Cr(VI)的掺杂能够增强Sch的稳定性,从而进一步抑制Sch的转化速率.实验体系pH值升高有利于Sch向针铁矿的转化.此外,Sch中Cr的释放规律与Sch的溶解转化速率密切相关.在低pH值条件下,Cr持续向环境中释放;高的pH值条件下,环境中Cr的释放量极大降低,Sch中的Cr进入到次生针铁矿中.Schwertmannite(Sch)was first synthesized via a rapid chemical method,and the effects of oleic acid concentration and pH on the transformation of Sch minerals and migration of Cr were investigated systematically.The results indicate that the transformation of Sch was greatly influenced by oleic acid via the inhibition of dissolution-transformation processes,and Sch remained at the primary stage after the transformation of 150days.Meanwhile,the stability of Sch was strengthened by the doping of Cr.Moreover,the Sch transformation rate increased with pH.In addition,the migration of Cr in Sch was heavily influenced by the dissolution-transformation processes.The release of Cr into the aquatic environment from Sch mineral occurred at low pH,whereas the migration of Cr into goethite took place in high pH environments.

关 键 词：施氏矿物 油酸 针铁矿 转化 CR(VI) 

分 类 号：X54[环境科学与工程—环境工程]