ZHOU Youhang^{a, b}, SONG Jialin^a, XU Changfeng^a, SHEN Wang^a, ZHAO Yu^a

(a. College of Mechanical Engineering; b.Engineering Research Center of Complex Tracks Processing,Technology and Equipment of Ministry of Education,Xiangtan University, Xiangtan 411105, China)

Abstract: The mechanical crushing method is easy to damage the fiber structure of fibrous clay minerals due to friction and extrusion. To solve this problem, this paper proposes a new method for crushing fibrous clay minerals, namely, crushing using transient temperature and pressure change. The use of the Griffith’s strength theory under high-temperature, high-pressure, and dry saturated steam explosion improvesthe theoretical basis of the method, the feasibility of this method is verified by the design test of sepiolite as raw material. The results from the experiment show that this method can preserve its fiber structure. As the set pressure of the pressure vessel increases, the sepiolite ore is increasingly crushed into a fine power, and the precision of the crushed mineral powder also increases.

Keywords: mineral powder; fiber structure; temperature and pressure transients; Griffith’s strength theory; tension breaking

中图分类号： TD-05

文献标志码：A

文章编号：1008-5548(2021)03-0097-08

DOI:10.13732/j.issn.1008-5548.2021.03.013

收稿日期： 2020-11-05，修回日期：2020-12-04，在线出版时间：2021-04-07 13:02。

基金项目：国家自然科学基金项目，编号：51775468；湖南省教育厅科学研究项目，编号：20A505。

第一作者简介：周友行(1971—)，男，博士，教授，博士生导师，研究方向为数字化设计及制造。E-mail：zhouyouhang@xtu.edu.cn。