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.
Some patients with acute low back pain, and more commonly those with sciatica, require oral opioids to control the pain. Opioids should be considered a second- or third-line analgesic option and should be used only for a short period for most patients.