Underground coal mining equipment 1 Manufacturer for more than 20 years 2 Best design proposal 3 Whole life service Complete Underground ... hematite, limonite, wolfram, ilmenite, and tantalum-niobium, etc. In recent years, it is also more and more applied in purifying quartz ... and gangue in the concentrating factory, make the mash of 20-30% raise up to 40-70% about. It is widely ...