环境工程学报2016，Vol.10Issue(10)：5957-5963,7.DOI:10.12030/j.cjee.201601080
磷石膏基胶结材固结磷尾矿性能及浸出特征
Properties and leaching characteristics of cemented phosphate tailings backfill with phosphogypsum-based cementation material
摘要
Abstract
Cementation mechanism and properties,which include the cementation slurry and a hardened specimen,along with the contamination properties of liquid leaching of phosphate tailings cementation with a phosphogypsum-based material (PM),as opposed to cement,were investigated in this study.The results showed that the bleeding quantity of a phosphate tailing cementation slurry with PM was smaller,and that the slurry fluidity with PM was better than that with cement under the same conditions.The compressive strength of the phosphate tailing hardened specimen with PM with different hydration age was 1.21 to 1.95 times higher than that with cement,except for a 3 day hydration.After a 3 day hydration period,the total phosphorus in the liquid leaching of hardened specimens with PM and cement was similar,but the pH with PM was far lower than that with cement.The total phosphorus in liquid leaching with PM was below the integrated wastewater discharge standard of China,which implied that the liquid leaching of hardened specimens with PM was safe to the environment.SEM and XRD analyses revealed that the main compositions of cemented phosphorus tailing included hydrated calcium silicate gels and acicular ettringite crystals,which were generated from the hydration of PM,dolomite,and brushite crystals,all of which contributed to higher compressive strength,lower total phosphorus,and pH.This finding suggests that PM is a more promising material for phosphate tailings cementation than cement.关键词
磷石膏/磷尾矿/砂浆流动度/抗压强度/pH/总磷Key words
phosphogypsum/phosphate railings/mortar fluidity/compressive strength/pH/total phosphorus分类
资源环境引用本文复制引用
黄绪泉,赵小蓉,唐次来,冯思源,杜奕锦,陈伯宇..磷石膏基胶结材固结磷尾矿性能及浸出特征[J].环境工程学报,2016,10(10):5957-5963,7.基金项目
湖北省自然科学基金计划资助项目(2014CFB676) （2014CFB676）
