Control effect of occupational hazards in coal mine and coal preparation plant

This study investigated the status of occupational risk factors and evaluated the control effect of occupational hazards in the coal mine and coal preparation plant. Based on the production process, categories of raw and auxiliary materials, work flow and relative standards such as specifications of air sampling for hazardous substances monitoring in workplace, investigation of the occupational hazards sampling point, sampling method and analytical methods were confirmed. The results demonstrated that the qualified rate of 24 detection points for chemical substances was 100.0%, for dust 79.2%; qualified rate of 91 noise points in the workplace was 87.9%. Qualified rate of time-weighted average concentration of coal dust was 30.0% in 20 types of subjects of underground mining operations, 83.3% in types of subjects of coal preparation plant qualified rate of 9 types of individual workers exposed to noise was 66.7%, 35 types of 8-h equivalent sound level of noise were calculated and qualified rate was 71.4%. The authors concluded that the test results show that the majority of occupational hazards in the workplace meets the occupational exposure limit, but underground work conditions and work environment cause tech. difficulty so that dust concentration can’ t meet the national occupational exposure limit. The occupational critical control points in the project are coal dust and noise produced by the underground mining unit extraction, transportation processes and coal preparation unit and transporting products processes. The authors suggest strengthening routine management and maintenance of dust removal and equipments, to enhance the operator’s individual protection and reduce occupational hazards.

Authors: Zhang, Yan-wei; Wang, Yuling; Wang, Xing-wen; Xie, Feng; Chang, Zhi-qiang; Xing, Yafei; Chen, Yu ;Full Source: Zhongguo Weisheng Gongchengxue 2010, 9(5), 323-327, 331 (Ch) ;