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.
The authors found clear evidence that Tylenol, NSAIDs, and tricyclic anti-depressants were effective for chronic low back pain, at least for short-term pain relief. Effects, however, were moderate-not overwhelming.