### Extraction and beneficiation methods of gold ores and ...

Strong magnetic separation. Manganese mineral is a weak magnetic mineral ( the specifical magnetization coefficient x=10×10-6～600×10-6cm3/g ), and it can be recovered in a strong magnetic field magnetic separator with a magnetic field strength Ho=800～1600kA/m (10000～20000oe), the manganese grade is increased by 4% to 10%.