Introduction about Hematite Beneficiation Process
Hematite is a kind of weakly magnetic iron ore, and there are many beneficiation methods used. Traditional beneficiation methods include roasting magnetic separation, flotation and high intensity magnetic separation, but the index of a single process is poor. According to the characteristics of hematite beneficiation process, it can be divided into roasting magnetic separation process, flotation process, weak magnetic-strong magnetic separation process, strong magnetic flotation separation process and heavy magnetic-float combined process.
Process of Hematite Beneficiation Process
Magnetite beneficiation process mainly includes three main processes: crushing, grinding and separation.
Crushing process:
Due to the high hardness of iron ore, large jaw crusher is usually used for rough breaking. Before the crusher will add a vibrating feeder to evenly feed the jaw crusher mineral raw materials, while the raw ore screen is divided into +75mm and -75mm two grain grades. +75mm grade ore into the jaw crusher for rough breaking, -75mm grade ore into the cone crusher for crushing.
Grinding process:
Due to the large hardness of the ore and extremely fine dissemination particle size, it is difficult to achieve the required yield and monomer separation by using the ordinary one-stage grinding process, so the process adopts the two-stage grinding process. This not only reduces the ore slime caused by mineral overgrinding and the reduction of mill efficiency, but also increases the yield and achieves the required grinding fineness.
Selection process:
The process uses permanent magnet drum magnetic separator for selection. A magnetic separator is used in the first stage of separation, and a coarse magnetic separator and a selective magnetic separator are used in the second stage of separation to achieve the requirements of more than 63% of the concentrate grade. In addition, the separation process also adds a demagnetization process to remove the magnetic properties of the mineral itself after magnetic separation to avoid magnetic linkage and affect the improvement of concentrate grade.
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