In magnetic separation practice, the ore is divided into strong magnetic minerals, weak magnetic minerals and the nonmagnetic minerals according to the size of specific susceptibility. weak magnetic minerals: This kind of ore belongs to the ferrous magnetic material, such as magnetite, magnetic pyrite, hematite and magnetic zinc, iron spinal, etc. This kind of ore can be recycled by magnetic separation machine with weak magnetic field intensity. strong magnetic minerals: They can be recycled by strong magnetic separation machine with magnetic field intensity h = 1 2 t. There are many mineral of this kind, such as iron man, hematite, mirror, limonite and iron ore, manganese ore, using, soft hard titanium iron ore, chromite, black tungsten mine, etc.
This kind of ore mostly belongs to the magnetic material, also have the ferromagnetic materials. nonmagnetic minerals: in the current technology conditions, it still can’t be recycled by the magnetic separation method t. Many of the minerals belong to this kind of the minerals, such as part of the metal ore-copper, lead, zinc sulfide ore and rust minerals, white tungsten, tin, stone, gold, etc.; most of the non-metallic minerals-natural sulfur, graphite, diamond, plaster, fluorite, kaolin, coal, etc.; most of the mineral rock made-adaptation, feldspar, calcite, etc. Some of this kind of ore belongs to the magnetic material; also some belong to the inverse magnetic material. In recent years, the successful development of weak magnetic gravity separation equipment, such as magnetic separation column, composite flash and magnetic field screening separator machine, will be described in this paragraph. Beijing general research institute of mining and metallurgy researched bk series permanent magnet drum magnetic separator, incluyendo bky, bkc, bkj, bkw, and bkf 5 models, which respectively apply to the pre-selection, roughing, premium, flotation dam re-election and anti-bubbles of magnetic separation.
They gain a good technological specification, and play an important role in increasing yield and economic benefit for magnetic separation plant. In recent years, the successful development of the largest specification ctb-? 1 200 x 4 500 mm wet permanent cylinder type magnetic separator, the angle is 127 degrees magnetic, magnetic induction in sorting area tube sheet is 180-350 mt, dealing capacity is up to 200-320 t/h (mine), pulp processing capacity is 600 – 700 m 3/h The magnetic separator can separate raw materials with different magnetic rigidities. The machine works under the magnetic force and machine force. Magnetic separators are designed to recover ferromagnetic materials. The separators are available in designs and sizes to provide solutions for all applications. The heart of each separator is the magnetic system with its unique design, which has a proven record of high efficiency. The magnetic separators are available in cyclic design with process vessel diameters smaller than 3 mm. Magnetic separator is one kind of efficient equipment for processing fine, feebly magnetic minerals, such as hematite, limonite, wolfram, limonite, and tantalum-niobium, etc. In recent years, it is also more and more applied in purifying quartz, feldspar and nephline. Its magnetic system is a ring-shape chain closed magnetic circuit with energizing coils made of copper tube and cooled internally by water. Grooved plates made of magnetic conductive stainless steel are used as magnetic matrix. Owing to the permanent magnet material formation of the magnetic system has already changed from to some rare earth nd-fe-b ferrite, which composed of composite magnetic system, or some using all of the nd-fe-b magnetic material being composed of magnetic system, so that the technical performance of magnetic separation equipment is continuously improving.