Study on Structures and Leaching Property of Phosphate Ore after Mechanical Activation
C. WANG1,2, X.-R. MO1, C. WANG1, and H. GAO1
1School of Materials Science and Engineering, Dalian Jiaotong University, Dalian, China
E-mail: wangchen19870913@126.com
2Liaoning Geology Engineering Vocational College, Dandong, China
Keywords: mechanical activation, phosphorite powder, leaching degree, kinetics
Pages: 471-475
Abstract
A high-energy planetary mill was used to conduct the mechanochemical activation treatment of phosphorite powders and increase the phosphate leaching rate. Laser particle analysis, X-ray diffractometry, and scanning electron microscopy were applied to study the influence of this treatment on the phosphate leaching rate. The kinetics and mechanisms of the mechanical activation of phosphorite powders was preliminarily analyzed on the basis of a solid-phase reaction kinetic model. Results show that the mechanochemical activation of phosphorite powders can effectively reduce the degree of crystallinity and improve their reactivity. The phosphate leaching rate can reach as high as 56.19 % after phosphate is activated eight times at a rotational speed of 1000 r/min of the planetary mill. The solid-phase reaction of activated phosphorite includes two processes: diffusion and interfacial reaction. The kinetic constant continuously changes with the reaction.
DOI: 10.15372/CSD20180503
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