Online ISSN: 2515-8260

Keywords : coal dust


PECULIARITIES OF HYGIENIC ASSESSMENT OF WORKING CONDITIONS OF WORKERS ENGAGED IN OPENCAST AND UNDERGROUND MINING OF BROWN COAL AND IN UNDERGROUND MINING OF HARD COAL

Utkir Adilov

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 2, Pages 1799-1812

Abstract. Employees are working on opencast coal mining from May to September
work in conditions of heating microclimate. A decrease in the influence of the high
temperature of air and solar radiation is reached by the uniform distribution of the hottest
time of day (from 12 to 16 o'clock) by drawing up the working schedule. The selection of
means of individual protection of hearing organs, their regular use, and efficiency assessment
performance will reduce the impact of noise on workers' bodies. Decrease of total working
time in conditions of exposure to industrial vibration not exceeding 5-6 hours will allow
reducing the class of working conditions on this factor. The effectiveness of individual
respiratory protection means the size of dust particles, the degree of insulation of the
underwear space in places where the mask is not tightly attached to the face. Considering dust
dispersion, working conditions classes of workers engaged in brown coal mining in
underground mine #9 "Angrenskaya" decreased by 1 stage, while in mine "Shargunkumir"
the working conditions classes on dust factor, on the contrary, increased by 1 stage.

OCCUPATIONAL MORBIDITY OF WORKERS ENGAGED IN MINING OF DIFFERENT GRADES OF COAL

Adilov Utkir

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 2, Pages 2722-2737

This work aimed to analyze professional morbidity in the coal industry of Uzbekistan.
The method of data copying from outpatient cards of professional patients and its statistical
processing was used for analysis. The professional morbidity rate in the coal industry was 108
cases per 10 thousand workers and 6.8 times higher than in other industries. At surface coal
mining in the open pit, as compared to underground mining in a coal mine, the number of
cases of first detected occupational diseases was, on average, 2.6 times lower. Thus, the
vibratory disease was most frequently met among workers of open-cast mining in comparison
with underground mining 1.4 times, and professional bronchitis, bronchial asthma and
pneumoconiosis - among workers of underground mining in comparison with open-cast
mining in 2.3 times.Vibration disease is diagnosed among workers of underground mines at
the work experience of 16 years, while among workers engaged in open-cast coal mining - 21
years and more. The analysis of results of medical and labor examination with professional
diseases of coal industry workers showed that among 48.3 ‰ of workers, there were 30.4 ‰
disabilities of Group III and 17.8 ‰ disabilities of Group II. These indicators had differences
depending on the brand of coal mined, so in the mining of brown coal (SiO2-10%), the
disability of professional genesis amounted to Group II 7.5 ‰ and Group III 31.3 ‰, while in
the mining of coal (SiO2-4%) 4.4 times more established Group II disability (73.3 ‰
workers) than Group III - (16.7 ‰). Conclusion: Coal dust of hard and lignite differ in
chemical and physical properties and degree of dispersion, which affects the level of
occupational morbidity and disability of workers.