A comparative study of dust control practices in Chinese and Australian longwall coal mines

Mine dust is one of the main hazards in underground longwall mines worldwide.In order to solve the mine dust problem,a significant number of studies have been carried out regarding longwall mine dust control,both in China and Australia.This paper presents a comparative study of dust control practices in Chinese and Australian longwall mines,with particular references to statutory limits,dust monitoring methods and dust management practices,followed by a brief discussion on the research status of longwall mine dust control in both countries.The study shows that water infusion,face ventilation controls,water sprays,and deep and wet cutting in longwall shearer operations are commonly practiced in almost all underground longwall mines and that both Chinese and Australian longwall mine dust control practices have their own advantages and disadvantages.It is concluded that there is a need for further development and innovative design of more effective dust mitigation products or systems despite the development of various dust control technologies.Based on the examinations and discussions,the authors have made some recommendations for further research and development in dust control in longwall mines.It is hoped that this comparative study will provide beneficial guidance for scholars and engineers who are engaging in longwall mine dust control research and practice.

聚氨酯硬泡外墙外保温技术在既有住宅楼节能改造中的应用

该技术在墙体外侧采用现场喷涂聚氨酯硬泡作为保温层,以钢丝网水泥砂浆作保护层,并用塑料胀管螺丝将基体和护层连为整体。具有轻质整体、高效保温、粘接牢固、防水、耐老化、施工方便等优点。15年工程实践检验证明,该技术工艺技术可靠,操作简便易行,监理检查直观,节能效果显著。既适用既有建筑维修改造,又适用于新建筑保温节能。该技术于2002年1月23日通过了吉林省建设厅组织的科技成果鉴定。