Effect of temperature in cutting deep holes on the content of harmful components in oil-based coolants
It was found that in cutting deep holes, with an increase in the temperature from 20 to 80°C, the content of harmful components: 9- and 2-methylanthracene, 3-methylphenanthrene, etc., in oil-based MR-3K coolant (CL) decreases by 15-25%, i.e., they enter the air of the working zone. The necessity of additional treatment of CL to remove polycyclic aromatic hydrocarbons to minimize the harmful effect on humans and the biosphere as a whole is demonstrated.
The study presented in this article is part of an ongoing joint research programme on acid mine drainage (AMD) being conducted by the University of Johannesburg and the Council for Geoscience. In this study, the corrosive characteristics of AMD from the goldfields of South Africa are examined. The motivation behind this collaborative research is to generate scientific understanding that deals with pertinent questions concerning possible interaction between AMD and infrastructure. The research programme was established in the recent wake of threats and risks associated with decant of AMD in the West Rand belt, and underlying risks in the Central belt of the Witwatersrand basin. Scientific understanding is needed to deal with perceptions and public fears, such as the potential of AMD to cause disastrous consequences on urban infrastructure.