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Pore structure and surface properties of diatomite with mechanical grinding and its influence on humidity control

Hu Zhibo, Zheng Shuilin, Li Jinyu, Zhang Shuaiqian, Liu Min, Wang Zhicheng, Li Jiaxin, Sun Hongjuan

Physicochemical Problems of Mineral Processing

2022

Vol. 58, iss. 6

art. no. 153509

Mechanical grinding (MG) is an effective method to regulate the pore structure and surface properties of mineral material. Grinding diatomite samples were prepared by horizontal sander under different grinding time. The pore structure and surface properties of grinding samples were characterized systematically by the particle size analysis, low temperature nitrogen adsorption, MIP, fractal theory, XRD, SEM, TEM, FTIR and surface hydroxyl density analysis. The humidity control performance (HCP) of grinding diatomite was tested under different temperature and relative humidity. The relationship among pore structure, surface properties and HCP was analyzed. The results show that macroporous is more easily damaged by mechanical force than mesoporous, and the internal blind holes structure can be opened. The HCP of diatomite is positively correlated with the specific surface area, mesoporous volume, the inhomogeneity of macroporous structure and the number of hydroxyl groups, while negatively correlated with the proportion of macroporous volume.