环境工程学报2018，Vol.12Issue(4)：1171-1181,11.DOI:10.12030/j.cjee.201710029
改性拜耳法赤泥颗粒的制备及对土壤铅的稳定化处理
Preparation of modified Bayer process red mud granules and stabilization treatment of lead in soil
摘要
Abstract
A large amount of Bayer process red mud is produced every years.It is difficult to handle due to its complicate composition and alkalinity,causing environment pollution.Soil heavy metal pollution is grim in recent years,leading to child blood lead poisoning.Regarding the issue above,we prepared red mud granules by using the Bayer process red mud as the main raw material,adding a little cement and other modified additives,followed by the applicationin stabilizing the soil lead.The results indicated that the optimized parameters for the modification are materials of 2％ cement + 5％ gypsum + 5％ fly ash + 5％ calcium dihydrogen phosphate + 83％ red mud,water cement ratio of 0.5,the disc granulation parameter of 28° ＜ α ＜ 40°and 20 r·min-1 ＜ R ＜ 40 r·min-1.The red mud particles prepared according to the optimized parameters are used to repair simulated soil with lead pollution at four different concentration which are 100,250,500 and 800 mg·kg-1.When dosing 5％ red mud particles followed by 10 days' immobilization,the bioavailability of lead was reduced 72.52％、65.38％、64.73％ and 40.03％,while the residual state increased by 43.4％,35.13％,43.42％ and 43.97％,respectively.The residual state of soil lead has a tendency to increase as the pollution concentration of soil increase,indicating that red mud prepared into a granular material can effectively stabilize the different concentrations of lead in the soil.关键词
赤泥/颗粒/土壤铅/稳定化Key words
red mud/granules/Pb in soil/stabilization分类
资源环境引用本文复制引用
杨慧珠,程乾坤,王新璋,陈惠康,张红云,黄雄飞,杨晓芳,汤叶涛,石太宏..改性拜耳法赤泥颗粒的制备及对土壤铅的稳定化处理[J].环境工程学报,2018,12(4):1171-1181,11.基金项目
广东省科技开发协作项目(71010623) （71010623）
