钨矿碱分解工艺制备仲钨酸铵全流程仿真计算

Simulation and calculation of whole process for preparing ammonium paratungstate by alkali decomposition of tungsten ore

以钨矿碱分解工艺制备仲钨酸铵全流程为对象,基于质量守恒、化学平衡、元素分配约束和指标约束等原理,构建钨矿配矿、磨矿、碱分解、脱磷、离子交换、除钼和蒸发结晶的热力学模型,进而根据各工序物料的迁移传递关系,应用MetCal软件平台,开发钨矿碱分解工艺制备仲钨酸铵全流程仿真计算系统,并采用典型工况下的实际值对模型计算的可靠性进行实例验证。研究结果表明:碱分解浓料中WO_(3)和P质量分数计算值与实际值的相对误差分别为-5.755%和-12.195%,钨渣中WO3、P、Fe、Mn和Ca质量分数的相对误差分别为-2.026%、-5.439%、-14.819%、-14.971%和11.826%;脱磷后液中WO3和P质量分数的相对误差分别为5.513%和-7.692%,脱磷渣中WO_(3)、P和Ca质量分数的相对误差分别为-5.834%、3.337%和7.113%;除钼后液中WO3和Mo质量分数的相对误差分别为-1.627%和-9.375%,除钼渣中WO_(3)、Mo、S和Cu质量分数的相对误差分别为2.547%、-8.827%、8.686%和9.692%。

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 WO_(3),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 WO_(3) and Mo in the solution after molybdenum removal are-1.627% and-9.375%,respectively.The relative errors of the mass fractions of WO_(3),Mo,S and Cu in the molybdenum removal slag are 2.547%,-8.827%,8.686% and 9.692%,respectively.