Microwave Irradiated Coal Series Kaolin and Its Oil Absorption Performance

Abstract

Abstract: As a raw material, Shanxi coal series kaolin (3 g) was processed under the microwave of 1800 W to increase the oil absorption value of coal series kaolin. The morphology and structure of kaolin before and after treatment were analyzed by means of scanning electron microscopy, X-ray diffractometer, infrared spectrum analyzer, and specific surface area analyzer. The results show that the oil absorption value of coal series kaolin increases first and then decreases with the increase of microwave treatment time. The oil absorption value reaches the highest (74.4 g/100 g) when the treatment time is 17.5 min (the highest temperature is 1 100 ℃), which is higher than the original kaolin by 61%. At this time, the adsorption average pore diameter of calcined kaolin is the largest and a small amount of mullite is produced. As the microwave process time increasing, the calcined kaolin sinters, which causes the closure of internal pores and the decrease of the oil absorption value. The oil absorption value of calcined kaolin is related to its adsorption average pore diameter and pore size distribution, and the production of a small amount of mullite can promote the increase of the oil absorption value.

Key words: coal series kaolin, microwave, oil absorption value, adsorption pore diameter

CLC Number:

TQ174.9

YAN Lei, ZHANG Tao, LI Jiaquan, GONG Keyu, MIAO Yang, GAO Feng. Microwave Irradiated Coal Series Kaolin and Its Oil Absorption Performance[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 527-533.

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