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***3 Beneficiation Production Line from shanghai minggong

Overview
Hematite is weak magnetic associated ore. The chemical composition of hematite is Fe *5%~*9%, S 0.*3%, P 0.2%, Si *4.*9%, Al2O3 7.*7%. The Mohs’ scale of hardness of the hematite is 6. The flow of the technics would be: 1st stage ore washing***-storage****1st stage crushing****2nd stage crushing****3rd stage crushing****2nd stage ore washing***-storage***-feeding ore into rotary kiln***-magnetizing roasting***-ore cooling***-storage***-ore milling***-magnetic separation***-dehydrate***-fine ore. The technics of coal powder making would be: coal storage***-coal milling***-coal powder concentrating***-coal powder scaling***-burning***-tail gas processing.

Ore extracting and washing 

According to data provided by customer, the physical size of ore we are processing is no bigger than **0mm. Ore is transported to raw material storage by truck. The volume of storage should be no less than ****0 ton. The storage can be divided into three parts: raw ore storage, big size ore storage and washed ore storage. Ore is sent to raw material silo. At the top of the silo, it is a screen which can pick out ore with size bigger that **0mm. Ore bigger than **0mm will be sent to big size ore storage, while smaller than **0mm goes into the silo. There is a discharge opening at the bottom of the silo, through which the material can go into to a 2FG***0****0 double screw sand washer to be washed. Given that the ore contains soil at a content of *0%, this sand washer is necessary to remove the soil and other impurity from the ore. The output of this screw sand washer is ***0 ton per day. The washed ore is sent to washed ore storage by belt conveyor. Washed ore with size bigger than **0mm will be sent to crushing silo. Under the opening of the silo is an ***0×***0 vibrating feeder. We can adjust the vibrating amplitude of feeder to control the feeding speed. The feeder can separate the ore with size bigger or smaller than *0mm: the bigger one will be send to a crusher, smaller one to a circular vibrating screen.

Ore Crushing and Storage

Washed ore and ore bigger than **0mm are sent to a jaw crusher **0×**0 for first stage crushing. The output size of jaw crusher is no larger than *0mm. The output of first stage crushing is sent to second stage crushing, two **0×***0 jaw crushers, to be crushed into size smaller than *5mm. The output of second stage is sent to a 2YK***0 circular vibrating screen, which has two layers screen, *5mm and *0mm. Rock with size bigger than *5mm will be sent second stage for further crushing. Rock with size smaller than *5mm is sent to the 3rd stage crushing, ***0×**0 hydraulic roller crusher, to be crushed into size no bigger than *0mm. Ore with size smaller than is sent to 2nd stage washing. The washed ore will be sent to a raw material silo, capacity **0t, by belt conveyors and two ***-type buck elevators. The silo should be able to store **0 ton material. We apply two flows in this plant; there should be a small silo at head of each rotary kiln. There are electromagnetic vibrating feeders at the bottom of silos to feed material into rotary kilns.

Magnetizing Roasting and Cooling

Material, smaller than *0mm, is fed evenly to rotary kiln feeder by a valve feeder which is installed at the bottom of raw material silo. Then, the material is fed into 3.5m×*0m metallurgy rotary kiln. The ore reaction contains three stages: preheating, high-temp calcining, cooling. The temperature of high-temp calcining should be **0°C, and the time should be *0~*0 minutes. After the reaction in the kiln, Fe2O3 become Fe3O4, which is magnetic. The reducers of this reaction would be C and CO. And the chemical reaction formula would be: 3Fe2O3+C→(**0°)2Fe3O4+CO,3Fe2O3+CO→(**0°)2Fe3O4+CO2 . While calcining, combined water of ore escapes, the grade of ore is improved. Magnetic ore goes through a discharge opening of rotary kiln into FG***0****0 sand washer for cooling. This machine cools the magnetic ore to **0°C. After cooling, magnetic ore will be stored. The waste air come out of the rotary kiln will be purified and sent to the atmosphere. There is a tube connecting the end of rotary kiln and the coal mill, using the hot air in the kiln to dry the coal.

Coal powder making and burning

Coal requirement is: heat productivity no less than ***0Kcal/kg, size smaller than *0mm. Coal is elevated into the coal silo, capacity *5 ton. There is a electromagnetic vibrating feeder, which feed the crushed coal into a 2.4×4.*5m coal mill, at the bottom of this silo. Coal is milled into powder in the coal mill. A blower press air to lift coal powder to a Type **0 powder concentrator which picks out the qualified powder. The unqualified powder will be sent back for further milling by a screw conveyor. The qualified will be sent to a ***5 dust collector by air. The collected powder is stored in a *5 ton capacity silo. Under this silo, there is a coal powder scale system, which can adjust the coal powder feeding speed. Powder and air is sent to a HNZL*2 burner buy a roots blower. The high temperature which this burner can generate is ***0°C. The tail gas of burning will go into a dust collector and the processed gas dust density is smaller than **0mg/m3 .

Ore separation

Magnetic ore is conveyed to a fine crusher first. The crushed magnetic ore is then stored in a silo. At the bottom of the silo, there is an electromagnetic feeder to control the feeding speed of magnetic ore. A belt conveyor transfer magnetic ore into ***0×***0 wet type ball mill to be mill into **0 mesh. Then the slurry is send to a ***0×***0 high type classifier. Qualified ore will run into a ***0×***0 magnetic separator, unqualified will be sent back to ball mill for further milling. The magnetic separator’s magnetic density is ***0 Gauss. It can improve the Fe content in the ore up to about *0%, recovery rate about *0%. The tailing is sent and stored into a tailing pool. *0% Fe content ore slurry is then sent to the second stage magnetic separation, ***0×***0 magnetic separator, ***0 Gauss. It can improve the Fe content up to about *0%, recovery rate about *3%. The final ore slurry is send to a disc type filter 2PG***8 to dehydrate. The dry final ore contain moisture less than 5%.

The tailings will be push to a disc type filter by a slurry pump for dehydration. The dried tailings can be stored for further usage.

hematite dressing plant/iron ore benficiation/magnetite beneficiation.