LIQUID AND SOLID PHASE REACTION KINETICS OF PHOSPHORIC ACID COMPLEX SYSTEM(II) EXPERIMENTAL STUDY ON DIGESTION KINETICS OF PHOSPHATE ORE PARTICLE SYSTEM
Based upon the discussion of the diffusion and reaction processes in paper Ⅰ,including general analysis of crystal micro-structure ,substance phase and chemical contents of three kinds of phosphate ores of domestic mine(Jing He,Xiao Feng and Kai Yang),the reaction kinetics process involving phosphoric acid-phosphate ore particles was investigated in an experiment system.As a result,the new negative temperature effect of iron and alumium impurity reaction was discovered.Accompanying these special phenomena in fractal particles ,the self-ordering structrue arising in the diffusion process was demonstrated in the experiments by using scanning electron microscopy and X-ray diffraction analysis.Furthermore,the kinetic process was described by adopting the new model in paper(Ⅰ) ,and satisfactory results were obtained.