Taking the phosphogypsum of a phosphogypsum stockpile as the research subjects,the harmless modification of phosphogypsum was carried out by proprietary composite agents with different proportions,and the compliance and stability of harmless modified phosphogypsum under different proportions and modification times were investigated.The results show that the characteristic pollutants such as pH value and phosphate and fluoride can meet the standard within 8 days,while the newly produced fresh phosphogypsum must be harmlessly modified no less than 16 days.In terms of long-term stability,the characteristic pollutants of harmless modified phosphogypsum remain stable after 45 days and meet the standard limit requirements.The results will provide reference for the large-scale application of phosphogypsum to the ecological restoration of mine pits after harmless modification,and finally realize the effective control of phosphogypsum environmental risks in China.
关键词
磷石膏/无害化改性/矿坑生态修复/特征污染物/稳定性
Key words
Phosphogypsum/Harmless modification/Ecological restoration of mining pits/Characteristic pollutants/Stability
维普
万方数据