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.
Prescription Pain Medications. Here is a comparison table summary of popular pain medication. The pain relievers below were ranked by effectiveness for chronic back pain, by a Harvard Study. Each pain medication was rated for effectiveness on a scale of from 1 (aspirin) to 10 (morphine). Disclaimer. . .top of page. Painkiller Comparison. Chart.