Theoretical reason of reducing ball size of coarse grinding has been found through tests on compressive strength of rock and rupture stress of naturalore lump.
通过岩矿的抗压强度和自然矿块破断力力学试验研究，找到了降低粗磨机钢球尺寸的理论依据。
2
Rock wool is used a variety of naturalore made of inorganic fiber, has excellent fire, sound insulation, heat insulation, water repellency seismic characteristics.
岩棉是用多种天然矿石制成的无机纤维，有优良的防火、隔音、保温、憎水抗震等特性。
3
Rock wool insulating tubes is basalt and other naturalore, etc as main raw materials, by high temperature melting in a fiber, stir-in binder, curing processing and is made.