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.
Popular painkiller doesn't help low back pain, arthritis, study finds. Acetaminophen -- best known as Tylenol in the United States -- does not appear to help ease lower back pain and offers little relief for the most common form of arthritis, according to a new report. The review of data from 13 studies could challenge existing recommendations on pain relief, experts say.