全磷渣胶结充填对环境的影响及其资源化利用  

Study on environmental influence of PG cemented backfilling and utilization of full phosphorus slag

作　　者：甘蕾[1] 李夕兵[1] 范昀[1] 石英[1] 

机构地区：[1]中南大学资源与安全工程学院,长沙410083

出　　处：《科技导报》2017年第13期84-89,共6页Science & Technology Review

基　　金：中南大学创新驱动项目(2015CX005;2015CX016)

摘　　要：通过对不同年份全磷渣充填区域渗滤水中污染物含量进行测定和分析,探索全磷渣胶结充填后渗滤水中各离子含量随时间的变化规律。研究结果表明,充填体渗滤水的pH值随着时间的增加逐渐趋于中性;未充填之前,磷石膏浸出液中总磷浓度高达3979mg/L,形成充填体后充填体渗滤水中总磷浓度变为1.3mg/L,经过一定时间的地下水淋滤作用后,总磷浓度降至约0.3mg/L;此外,充填体渗滤水中Zn、Fe、Cr、Mn、Ba、As等元素的含量随充填时间的推移明显降低,且保持在相对较低的水平。但充填体中的部分F和Pb能溶出到渗滤水中,其溶出迁移机理及固化技术有待进一步研究。总体来说,相对磷石膏地表堆存,全磷渣胶结充填可以较好地固结磷石膏中大部分污染物,有着广阔的工业推广价值和发展前景。Phosphogypsum（PG） is an industrial solid waste containing a large number of pollutants, and its surface stockpile has a potentially negative impact on the environment nearby. The PG-based cemented backfill can solve the problem to a great extent. However,the negative environmental impact might be transferred into the underground when PG-based cemented backfill is filled into tunnels of mine, which is still an open question. This paper studies the change of pollutant concentrations in the leachate of PG-based backfill. The results show that the pH value of the leachate tends to be neutral with time. Before backfilling, the phosphate concentration supernatant of PG solution is 3979 mg/L, and it decreases to 1.3 mg/L when PG is made into backfilling material. In the prolonged store underground, the phosphate concentration decreases to about 0.3 mg/L. On the other hand, the concentrations of Zn, Fe, Cr, Mn, Ba, As and other elements in the leachate significantly decrease in the leachate after being cemented. Some F and Pb can dissolve in the leachate indicates that the dissolution migration mechanism and the F, P solidication technology need to be further studied. In conclusion, compared to PG surface stockpile, PG-based cemented backfill can well solidify/stabilize the harmful pollutants in PG, which could be a promising industrial process for PG disposal.

关 键 词：全磷渣胶结充填 充填渗滤水 固结作用 

分 类 号：X781.3[环境科学与工程—环境工程]