Analysis of Leaching Characteristics of the Impurity Potassium in Ammonium Molybdate Production
In the process of producing ammonium molybdate by roasting and ammonia leaching,the leaching rule of potassium in ammonia leaching process of molybdenum calcine was studied by ICP,XPS,SEM,etc.,and the change of occurrence form of potassium in ammonia leaching process was investigated by MLA and Factsage thermodynamic software.The kinetic law of potassium release was investigated by using the unreacted kernel model,parabolic diffusion equation,double constant equation,Elovich equation and first-order kinetic equation.The results show that the leaching of potassium in the ammonia leaching process of washed molybdenum calcination can be divided into two stages:Preleaching stage is the leaching process of ionic potassium,which mainly occurred the ion exchange reaction of KCl and K2 SiF6,and the leaching activation energy is 4.79 kJ/mol.The Elovich model is the best fit for this stage.Late leaching stage is mainly the leaching process of potassium from mineral potassium the leaching activation energy is 34.55 kJ/mol,and the optimal kinetic model is a double constant model.At the late stage of leaching,the potassium release rate is slow,and the potassium release ability of the four potassium-containing minerals is from weak to strong in the order of i l lite＜barium ferromica＜mica＜orthoclase.
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