Abstract
The best way to control respirable coal dust in mines is not to generate it. The chapter analyzes the respirable dust generation mathematically and relates it to various chemical and physical properties of coal. Next, an experimental method to measure the production of respirable dust is presented. Eighteen samples of coal are subjected to the same comminution process, and the resulting fraction of respirable dust is called the respirable dust index (RDI) of that coal. It ranges from 6.4 to 28.5, indicating that some coal will produce four to five times more respirable dust when mined by the same machine. RDI is significantly dependent on moisture, fixed carbon (D.A.F.), ash (dry), and fusain content of coal. Similar studies conducted later on reconfirmed the original findings by Thakur. Sharpness of the cutting bit also impacts respirable dust generation. A blunt bit may product 25% more respirable dust compared to that produced by a new, sharp bit.
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