title: [A coal mine and coal preparation plant coal dust workplace present situation investigation and analysis].
abstract: OBJECTIVE
  Through a detection of dust in the coal mines workplace, to understand the status of occupational hazards, and the evaluation of occupational hazards, provide subject to control occupational hazards.
  
  
  METHODS
  According to production process and "hazardous substances in workplace air monitoring, sampling norms" and other standards to determine the sampling points and sampling of coal dust.
  
  
  RESULTS
  Underground mining operations in 21 subjects with time-weighted average concentration of dust types pass rate of 28.6%, of which five types of dust hazard grade II, six types of dust hazard rating of 0, and the remaining types of grade I dust hazard levels. Coal dust test six types of time-weighted average concentration of 83.3% pass rate, only one types of dust hazard grade I, all the rest is 0. Calculated by the detection of dust overrun 18 times operating sites, the pass rate of 72.2% results.
  
  
  CONCLUSIONS
  Purified water spray and air flow curtain of dust control has played a certain role, but the work of underground working conditions and environmental constraints, most of the dust concentration in workplace occupational exposure limits do not meet the requirements, recommended the strengthening of dust or Dust the daily management and maintenance of equipment, strengthen the ventilation, personal protection officers to strengthen operations.
authors.affiliation: Institute of Industrial Hygiene of Ordnance Indutry, Xi'an 710065, China.
authors.forename: Xing-Wen
authors.initials: XW
authors.lastname: Wang
authors.forename: Yan-Wei
authors.initials: YW
authors.lastname: Zhang
authors.forename: Yuan-Han
authors.initials: YH
authors.lastname: Sun
authors.forename: Feng
authors.initials: F
authors.lastname: Xiu
authors.forename: Yu-Ling
authors.initials: YL
authors.lastname: Wang
mesh_terms: D000395:Air Pollutants, Occupational / Q000032:analysis*; D003032:Coal Mining; D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring; D006801:Humans; D016273:Occupational Exposure / Q000032:analysis*; D017132:Workplace
chemical_list: D000395:Air Pollutants, Occupational; D004391:Dust