Simulation and calculation of whole process for preparing ammonium paratungstate by alkali decomposition of tungsten ore
Based on the principles of mass conservation,chemical balance,element distribution constraints and index constraints,the thermodynamic model of tungsten ore matching,grinding,alkali decomposition,dephosphorization,ion exchange,molybdenum removal and evaporative crystallization of the whole process of preparing ammonium paratungstate by alkali decomposition of tungsten ore was constructed.Then according to the migration and transfer relationship of materials in each process,a simulation calculation system for the whole process of preparing ammonium paratungstate through the alkali decomposition of tungsten ore was developed using the MetCal software.The reliability of the model calculation was also verified using actual production data under typical operating conditions.The results showed that the relative errors between calculated values and production data of WO3 and P mass fractions in the concentrated solution of alkali decomposition were-5.755%and-12.195%,respectively.The relative errors of WO3,P,Fe,Mn and Ca mass fractions in tungsten slag were-2.026%,-5.439%,-14.819%,-14.971%and 11.826%,respectively.The relative errors of the mass fractions of WO3 and P in the dephosphorization solution are 5.513%and-7.692%,respectively.While the relative errors of the mass fractions of WO3,P and Ca in the dephosphorization solution slag are-5.834%,3.337%and 7.113%,respectively.The relative errors of the mass fractions of WO3 and Mo in the solution after molybdenum removal are-1.627%and-9.375%,respectively.The relative errors of the mass fractions of WO3,Mo,S and Cu in the molybdenum removal slag are 2.547%,-8.827%,8.686%and 9.692%,respectively.
万方数据
维普
