Magnetic Minerals Magnetite-quartzite

Magnetite-quartzite deposits are sedimentary-metamorphic ore

, magnetic separation method widely used at home and abroad this type of ore sorting, the types of ore in China is known as Anshan-type magnetite ore poor in foreign countries known as taconite, magnet quartzite, etc., in iron ore resources in such an important position, is the main target of magnetic separation.

Magnetite-quartzite beneficiation process is characterized by the use of phase magnetic stage grinding process, so that discharge can be monomer gangue phases, reducing the amount of the next stage of grinding.

Magnetic devices use more cylinder-type magnetic separator, the upstream end of trough-type and semi-countercurrent type. At home and abroad have used magnetic dewatering tank for instance off the mud.

Iron Ore Crusher Following the Capital Iron and Steel Company Dashi iron ore concentrator introduces an example.

Dashi iron ore dressing plant is the main raw material base of Capital Iron and Steel Company, located in Hebei Province Qian'an County. Dashi Anshan-type iron ore is poor magnetite to form the ore bodies are pre-Sinian strata in wells were banded gneiss and gneissic structure. Between the ore and the ore body within the broad development of various types with stone, the mining process about 15% of mixed waste rock, ore dilution serious geological grade of 30.18%, selected only 25% of the ore grade.

Metal ore minerals are mainly magnetite, followed by a small amount of hematite and hematite false; main gangue minerals of quartz, followed by pyroxene, hornblende, less harmful impurities.

Symbiotic form of magnetite and gangue simple, easy to dissociation. Coarse-grained disseminated magnetite and uniform. Crystal grain size of 0.062 ~ 0.5mm crystals accounted for 60% ~ 70%, 0.5 ~ 2mm total 10% ~ 20%, O.062mm the following content accounted for about 10%. Fine-grained hematite. Gangue minerals are coarse crystalline grain size, between the 0.18 ~ 0.35mm. Grinding to -200 mesh ore accounted for 75% to 80%, the useful minerals and gangue basic to monomer dissociation.

The use of sand making machine - weak magnetic separation process. First, the pulleys on the ball with the magnetic material into the pre-selection, can be discarded before the grinding yield of 8%, 9% of grade waste rock, into the ground to improve product quality by 2% magnetic iron recovery was 99%. The first paragraph, a second magnetic concentrate grade, the second grinding, magnetic separation concentrate upon the second after fine sieve sieve material to return the ball mill, Sec, as selected three sections of the magnetic particle size has been strictly controlled, increased mineral monomer dissociation degree, make the final concentrate grade from 64% to 65% to 67% ~ 68.5%.

The process of the main technical indicators: ore grade of 26.28%, 68.42% concentrate grade, tailings grade 6.41%, 82.64% recovery rate.

by: crusherb2b

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