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Hematite beneficiation equipment can be classified according to its beneficiation stages, including pre-selection equipment, separation equipment and concentrate/tailings dehydration equipment >section.
The hematite pre-selection stage mainly includes the crushing and screening and grinding and classification stages , among which crushing and screening are crushing and screening, and grinding and classification are grinding and classifying stages.
Crushing and screening: The raw ore is sent to the crusher by the feeder for crushing. The crushed products enter the screening machine, and the objects above the screen are returned to the crusher for re-crushing, and the objects under the screen are Then it is sent to the grinding stage by the belt conveyor.
Grinding and grading: Generally, the hematite grinding and grading part mostly adopts two-stage grinding operation, mostly using autogenous grinding machine (large-scale concentrator) or grid-type ball mill + overflow A flow ball mill is used for wet grinding. After grinding, the minerals are classified, the overflow product enters the separation stage, and the low flow is returned to the ball mill for re-grinding.
Commonly used mineral processing equipment for hematite at this stage include: Crusher, screener, belt feeder, ball mill, classifier, hydrocyclone, etc.
Ball mill: The lattice ball mill is used for coarse grinding and is mostly used in one-stage grinding operations. The overflow-type ball mill is used for fine grinding or two-stage grinding operations. Rod The mill is mainly used for fine crushing and coarse grinding operations;
Classifier: Generally used with grid ball mill, high weir spiral classifier The processing capacity is 10~1785t/d, and the submersible classifier has a processing capacity of 50~1410t/d;
Hydrocyclone:Generally used with an overflow ball mill, with a processing capacity of ≤542m3/h. The specific model can be customized according to the characteristics of the ore.
Crusher: There are jaw crushers, hammer crushers, cone crushers, mobile crushing stations, etc., which can be suitable for crushing various minerals to suitable particle sizes;
Screening machine: The self-centering vibrating screen is suitable for classifying medium and fine-grained minerals; the linear vibrating screen is suitable for dehydration, desliming, deliquidation and removal of heavy media; the circular vibrating screen is used for Material particle size classification;
Belt feeder: It can transport various block and granular bulk materials with a bulk density of 0.5~2.5t/;
The hematite separation stage mainly includes flotation, magnetic separation, gravity separation and combined separation. The equipment is determined according to the process plan. The hematite separation equipment is as follows:
The flotation method separates hematite, which uses the difference in properties of the mineral surface to improve its characteristics by adding chemicals to the mineral. Positive flotation method, Reverse flotation method, etc.
Forward flotation:Use anionic collector to float iron ore from raw ore;
Reverse flotation: > Use anionic or cationic collectors to float gangue minerals from raw ores.
The main hematite flotation equipment includes: SF flotation machine, JJF flotation machine, BF flotation machine machine, KYF flotation machine, XCF flotation machine, etc. (Details of hematite flotation equipment), the specific equipment needs to be customized according to the properties of the ore.
Hematite magnetic separation can be divided into There are two types of weak magnetic separation and strong magnetic separation. Weak magnetic separation: combined with strong magnetic separation. After weak magnetic separation, the tailings obtained enter the strong magnetic coarse separation process. After separation and sweeping, the coarse concentrate enters strong magnetic separation. This process is mostly suitable for magnetic and hematite mixed ores; Strong magnetic separation: is often used in conjunction with flotation , the coarse concentrate is obtained through strong magnetic separation, and then enters the ball mill for fine grinding, and then enters the flotation machine to obtain the hematite concentrate. This method is suitable for processing hematite containing quartz, feldspar, chlorite and other gangue minerals.
The main hematite magnetic separation equipment includes: Permanent magnet drum magnetic separator, high gradient magnetic separator, eccentrically arranged rotating magnetic field dry separator, magnetic drum, etc.
Permanent magnet drum type magnetic separator: Can do pre-selection, rough selection and selection operations, the selected particle size range is 2~10mm;
High gradient magnetic separator:Mainly used for strong magnetic separation, suitable for processing fine-grained hematite ore below 2mm;
Dry magnetic separator: strong>Used for pre-selection of hematite before grinding; re-selection of hematite tailings and iron recovery from waste steel slag.
Magnetic roller: Do more strong magnetic separation, suitable for magnetic separation of coarse-grained hematite below 30mm.
There are three types of hematite gravity separation, which areaccording to the particle size of hematite ore For selection, there are jig gravity separation, shaker gravity separation and chute gravity separation. The mineral processing equipment are jig, shaker and spiral chute respectively.
Jigger:Processing 30(2)~0.5mm coarse hematite;
Shaking table: Processing of fine-grained hematite of 2~0.037mm;
Spiral chute:Processing of fine-grained hematite of 0.1~0.37mm with low mud content.
Hematite dehydration operations are generally divided into concentrate dehydration and tailings dehydration. The specific dehydration requirements should be determined according to the actual needs of the dressing plant. Among them, hematite concentrate dehydration is the iron concentrate obtained after sorting and entering the concentrator for concentration. After reaching a certain dehydration rate , sent to the filter for continued dehydration, and the obtained filter cake hematite concentrate is ground. Hematite tailings dehydration The tailings dry discharge system is mainly used, and a variety of dehydration equipment is used for dehydration to reduce the content of The amount of water is sent to the tailings pond for storage.
The main dehydration equipment of Xinhai Mining includes: Concentrator, high-frequency dehydration screen, filter press, filter and cyclone
strong>etc.Cyclone: Generally used in one stage of concentration operation, the low flow concentration range is 60~70%;
Concentrator: Can be used for one-stage or two-stage dehydration operations, with a low flow concentration range of 50~60%;
High-frequency dehydration screen :Generally used as a three-stage dehydration operation, the final moisture content is 12~15%;
Filter press/filter:Commonly used in the final dehydration stage, the moisture content is is 9~12%.
The above is an introduction to the conventional beneficiation equipment for hematite beneficiation. In actual beneficiation plants, the selection of hematite beneficiation process methods and beneficiation equipment must be based on the beneficiation test results and cannot be blindly selected or selected. Copy the process equipment and customize the hematite beneficiation process and equipment that suit your actual situation to achieve the ideal return on investment.
Xinhai Mining has more than 20 years of experience in mineral processing plant design and equipment production, and has participated in a number of hematite-related projects. If you have any needs, please feel free to consult Xinhai Mining Equipment.
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