Click image to view original image
云母矿石的选矿是生料云母的富集过程。生料云母是指原矿中轮廓面积大于或等于4cm2的任意厚度的云母晶体。原矿中生料云母含量的多少称为生料云母含矿率，通常用单位矿石体积内含生料云母的重量(kg/m3)来表示。经选矿所得精矿中生料云母的总重量与原矿中所含生料云母总重量之比称为回收率。
Industry is mainly of natural mica crystals directly processed into products they need. The larger crystal, no defects, the higher its economic value, and therefore mica ore beneficiation process as possible to protect the natural mica crystals from destruction.
At present, the crystal outline is larger than 4cm2 chip mica mineral, primarily on the basis of crystal and gangue in the shape and the difference in friction coefficient to be commonly used methods are hand-selected, friction, shape the election. The crystal size is less than 4cm2 in broken outline mica, mainly based on its physical and chemical properties of gangue differences in the surface to carry out sorting, and the methodology for the flotation.
(1) piece of mica beneficiation process
a, hand-selected
Workers in the mining face or pit ore heap, selection has been mica monomer separation; mica and gangue in hand with the living body hammer crack, and then select one of the mica.
b, friction dressing
Flakes of mica crystals according to the sliding friction coefficient and rounded shape of the rolling friction coefficient of gangue difference, Er Shi mica crystals and gangue separation. One of equipment used for the inclined plate separator. The machine is composed of a set of metal ramps, each ramp length 1350mm, width 1000mm, under which the inclination of a ramp over a ramp on the dip. Bottom of each block ramps are left to collect gap crystal, and its wide array according to the order of descending ramps. Crack front with triangular weir plate. In the sorting process, the large vein stone rolled down to rubble; mica and small stones by the weir plate block pulse, falling through the cracks of a ramp. In the inclined plane in turn repeat the process, so the gradual separation of mica and gangue. At present, the friction mineral processing technology and equipment is not perfect, so Mica Ore, the Act has not been widely used.
C, the shape of mineral
Mica crystals and gangue under different shapes in the screening of the sieve slit through the sieve, sieve different capacities, so that separation of mica and gangue. Sorting, the adoption of a more than two different sieve screen surface structure, the first layer of screen mesh for the general bar; second level screen mesh for the square. When the ore into the screen surface, due to vibration or rolling effect, sheet mica, and small screen gangue seam leakage from the bar to the second layer of sieve; for the second layer is a lattice screen, it can be to weed out the remaining gangue under the sheet mica. Shape dressing method is simple process, equipment, small, high productivity and good separation effect, which in the mica mines are widely used.
