磷石膏
磷酸
石膏
废物管理
抗压强度
柠檬酸
草酸
试剂
碳酸氢钠
碳酸钠
浸出(土壤学)
原材料
化学
固化(化学)
粉煤灰
石灰
制浆造纸工业
核化学
环境科学
材料科学
钠
冶金
复合材料
无机化学
食品科学
有机化学
高分子化学
土壤水分
土壤科学
工程类
标识
DOI:10.1016/j.promfg.2019.06.007
摘要
This study investigated the use of a chemical treatment process to treat phosphogypsum waste generated from a phosphoric acid production plant and render the final product useful for building and construction applications. Four reagents namely; citric acid, oxalic acid, sodium carbonate and sodium bicarbonate were used for the reduction and removal of hazardous and radioactive constituents in the material. The results for the untreated gypsum revealed that phosphogypsum used in this study was radioactive and laden with radionuclides such as 210Pb, 214Pb, 214Bi, 226Ra, 208Tl, 228Ac, 40K. The best leaching reagent was found to be 0.5 M citric acid as it reduced the relative proportion of contaminants contained in the material. The treated product was blended with lime and fly ash and the effect of curing temperature and phosphogypsum content on the unconfined compressive strength was investigated. Curing at higher temperatures proved to improve the strength of the specimen, the highest strength were obtained at PG content of 30%.
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