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.
Muscle relaxants, opioids offer no benefit for low back pain. In a new study, people who arrive at the emergency room with severe low back pain didn't experience more relief with muscle relaxants or opioids than with over-the-counter painkillers. Non-steroidal anti-inflammatory drugs (NSAIDs) alone offered as much relief as more powerful painkillers.