The basic principle for coal preparation is to first liberate the coal particles from the gangue (quartz) and then, by applying different water based techniques, separate the coal particles and gangue particles.
Acetaminophen in the Treatment of Acute Low Back Pain. For low back pain, acetaminophen can be effectively used as an analgesic (or pain killer). Doctor-written article on acetaminophen as a pain reliever for lower back pain.
Even as you practice patience, a nonsteroidal anti-inflammatory drug (NSAID) such as ibuprofen (Motrin, Advil) or naproxen (Aleve) can help ease the pain you're pushing through. The research behind medicine guidelines for lower-back pain finds that these may give slightly better relief than acetaminophen (Tylenol).