以有色冶金企业排放的高含盐废水为原料用模拟日晒法制备了芒硝碱混合物,所得固体混合物在140 ℃烘干15 h后取其小部分置于玛瑙研钵中研细,供X射线衍射(XRD)分析。XRD分析的结果表明:该样品中存在有3种物相:即以正交晶系存在的Na2SO4,以斜方晶系存在的Na6(CO3)(SO4)2和以立方晶系存在的NaCl。应用无机晶体结构数据库(ICSD-2006)对其晶体结构及相关参数作了测定。应用Rietveld全谱拟合无标样方法,并采用TOPAS应用软件进一步对样品作定量相分析,所得到的Rwp(18.00),Rp(14.14)及GOF(1.49)值均达到较高的拟合精度。

Mirabilite alkali mixture was prepared from high salt containing waste water drained from non-ferrous smelteries by simulated sunning-evaporation. The solid mixture was dried at 140 ℃ for 15 h, and a small portion of the dried mixture was pulverized and used for X-ray diffractometry (XRD). As shown by the results of XRD, 3 phases, i.e., Na2SO4 as orthogonal crystal, Na6(CO3)(SO4)2 as rhombic crystal and NaCl as cubic crystal, were found in the sample. The inorganic crystal structure database (ICSD-2006) was used in the determination of crystal-structures and related parameters of the mirabilite alkali mixture. Quantitative phase analysis of the sample was performed by applying the Rietveld method of full spectrum fitting without using standard samples of pure-phase compounds, and using the applied TOPAS software. As shown by the results, values of Rwp (18.00), Rp (14.14) and GOF (1.49) with high fitting precisions were obtained.