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.
There is no one right NSAID for back pain -- you may need to try a few before you can identify the best choice for you. Tylenol, on the other hand, relieves pain but does not reduce inflammation. Anti-inflammatory or not, all over the counter pain medications for back or neck pain offer both risks and benefits. Deciding on which to take depends on your individual health picture.