Study Of The Characteristic And Thermal Decomposition Of Hanyuan Phosphate-potassium Ores

Hanyuan phosphate-potassium ores is the only valuable ores for exploitation in China so far. The characteristic of Hanyuan phosphate-potassium ores and thermal decomposition constituent are first studied by using the method of X-ray diffraction quantitative analysis in this thesis. The results can be applied in guiding the process of Hanyuan phosphate-potassium ores application and provide the creative thinking way for the application of the method of X-ray diffraction quantitative analyzing constituent of ores.The technical condition of temperature and mass ratio of Hanyuan phosphate-potassium ores is studied. Hanyuan phosphate-potassium ores is taken first thermal decomposition with the addition of CaCO3,CaS04 and CaCO3+CaSO4,then the mixture is extracted by H2SO4 for phosphate and potassium. The best operating condition is that when m(phosphate-potassium ores):m(CaSO4):(CaCO3) is 1:1:1 at 1100 ,the potassium extraction efficiency reaches 87.2%, the phosphate extraction efficiency reaches 64,8%. Meanwhile, the kinetics relationship of the K2O extraction efficiency of Hanyuan phosphate-potassium ores and the time is studied to build the experience formula of a = a(1-e-bt) which is highly correlated and meaningful.The parameter a stands for the balance translating rate while the parameter b is related with the reaction activation energy.