以合成雪硅钙石为晶种回收废水中的磷  

Phosphorus recovery from wastewater by synthetic tobermorite through seeded crystallization

作　　者：张蓓蓓[1] 郑红[1] 马鸿文[1] 韩丽杰[2] 张红梅[2] 

机构地区：[1]中国地质大学矿物材料国家专业实验室,北京100083 [2]中国地质大学材料科学与工程学院,北京100083

出　　处：《岩石矿物学杂志》2007年第6期553-557,共5页Acta Petrologica et Mineralogica

基　　金：矿物材料国家专业实验室开放基金课题(A05006;07A001)

摘　　要：以合成雪硅钙石为晶种,探索了用结晶法以磷酸钙形式回收废水中磷的适宜条件。结果表明,在实验水质条件下,模拟废水pH=8、n(Ca)/n(P)=2、晶种用量大于1.6g/L、振荡24h后溶液中残留磷可达到国家污水综合排放标准一级(0.5mg/L)以下;在优化条件下证实了合成雪硅钙石的供碱能力,循环利用18次,回收磷的效果仍然很好。运用XRD、FTIR、SEM和EDS等测试手段对在实验条件下重复使用18次的雪硅钙石进行了表征,证明回收的磷主要以结晶度不高的羟基磷灰石形态存在。The optimized conditions for phosphorus recovery as hydroxyapatite from wastewater by synthetic tobermorite through seeded crystallization were studied in this paper. The results show that pH value of 8, Ca/P ratio of 2 （molar ratio） and 1.6 g/L seed concentration seem to be the favorable conditions. It is proved that under the optimized conditions the seed can yield alkalis. During the process in which tobermorite was used for eighteen times, all the concentrations of residual phosphorus were satisfactory. Charac- teristics of the products were determined by such analytical techniques as Powder X-ray Diffraction （XRD）, Fourier Transform Infrared （FTIR）, Scanning Electron Microscopy （SEM） and EDS. The results show that the main recovered product is hydroxyapatite with a lower crystallization degree.

关 键 词：结晶法 磷回收 合成雪硅钙石 羟基磷灰石 

分 类 号：P579[天文地球—矿物学] X703[天文地球—地质学]