Microstructure and adhesion force of dust on soil pavement in open-pit mine

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS
Jiuzhu Wang, Cuifeng Du, Yuan Wang, Zheng Chen
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Abstract

The microstructure and adhesion force between dust particles determine the dust starting and migration to a certain extent. By use of scanning electron microscopy, the BET method, and the abruption technique, the microstructure and adhesion force of dust on the soil pavement of an open-pit mine were examined. The results indicate that the dust shape of soil pavement is mainly irregular quadrilateral, pentagonal and circular. The adhesion of dust particles in soil pavement reduces as particle size and temperature increase. When the particle size grows from 22 to 30 μm and the ambient temperature rises from 25 to 30 ℃, the adhesion force of dust particles in soil pavement drops dramatically. The adhesion force of dust particles in the soil pavement of open-pit mine increases as environmental humidity and pressure rise. When the environmental humidity exceeds 70% and pressure exceeds 24.79 kPa, the adhesion of dust particles increases dramatically. On the basis of the multiple regression method, a prediction model for the dust adhesion force of open-pit mines’ soil pavement has been developed. However, its accuracy needs to be further enhanced.

Abstract Image

露天矿土壤路面粉尘的微观结构和附着力
粉尘颗粒之间的微观结构和附着力在一定程度上决定了粉尘的起尘和迁移。利用扫描电子显微镜、BET 法和剥离技术,对露天矿土壤路面粉尘的微观结构和附着力进行了研究。结果表明,土壤路面的粉尘形状主要为不规则的四边形、五边形和圆形。粉尘颗粒在土壤路面的附着力随着颗粒大小和温度的增加而减小。当粒径从 22 μm 增大到 30 μm,环境温度从 25 ℃ 升高到 30 ℃ 时,粉尘颗粒在土壤路面中的附着力急剧下降。随着环境湿度和压力的升高,尘粒在露天矿土壤路面中的附着力也随之增大。当环境湿度超过 70%,压力超过 24.79 kPa 时,粉尘颗粒的附着力会急剧增加。在多元回归法的基础上,建立了露天矿土壤路面粉尘附着力的预测模型。但其准确性有待进一步提高。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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