Physicochemical properties of rhodochrosite before and after leaching and the changing law of interface hydration behavior
Electrolytic manganese residue(EMR)with high water content has become a bottleneck restricting the development of China's EMR industry.In this study,the physicochemical properties such as mineral composition and microscopic morphology were analyzed before and after the leaching of rhodochrosite,and the hydrophilic coefficient,wetting heat,water content and filtration performance before and after the leaching of rhodochrosite were investigated.The results showed that the hydrophilic clay minerals such as kaolinite and hydrotalcite zeolite appeared in the EMR after leaching.At the same time,the new infrared characteristic peaks of structural and crystal water appeared in the electrolytic manganese residue after leaching.The water content after leaching increased from 17.68%to 32.67%,the wettability heat increased from 0.743J/g to 3.879J/g and the hydrophilic coefficient increased from 1.117 to 2.233.In addition,the filtration performance of the leached EMR was affected by clay minerals and the filtration rate after leaching decreased from 10.318mL/min to 5.296mL/min.This study provided theoretical support for the research and development of water content control technology in the electrolytic manganese residue.
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