高纯三氯化锑的制备

研究了SbCl

Preparation of high purity antimony chloride

Phase equilibrium of the SbCl3-HCl-H2O system has been studied. By Othmer method, the compositions of gaseous and liquid phase and boiling points of HCl solution (4,8,12 mol/L) with certain concentrations of SbCl3 were detemined. The phase diagrams of temperature-concentration and composition of gaseous phase-composition of liquid phase have been measured. And in distillation systems the temperature effects on distillation rate of As and recovery rate of Sb have been determined. Based on the phase equilibrium studying and concerned data, high purity SbCl3 was prepared by chlorilation-distillation-rectification method. The flue dust containing As and Sb is first leached and distilled with HCl solution at about 110 ℃. A part of AsCl3(87.67%) is distilled out with HCl and H2O. SbCl3(99.50%) and other metal chloridets are dissolved in the leaching solution. Some metals can not be leached by HCl solution and are left in the residue. Then from the leaching solution, high purity SbCl3 can be prepared. The rectification column is maintained in the temperature range of 120～220 ℃. The purity of obtaining SbCl3 is above 99.999%. This is a new process of changing waste to treasure, reducing environmental pollution and obtaining high quality product.