In the beneficiation process, grading is an extremely important preparation exercise. Grading can effectively separate thecoarse and fine particles, thus avoiding the over-comminution of the fine-grained minerals, reducing unnecessary energy consumption, and enabling the coarse-grained minerals to become the comminuted sand returning mill effectively.
In the beneficiation process, grading is an extremely important preparation exercise. Grading can effectively separate thecoarse and fine particles, thus avoiding the over-comminution of the fine-grained minerals, reducing unnecessary energy consumption, and enablingthe coarse-grained minerals to become the comminuted sand returning mill effectively. Grading of a direct impact on the classifier machine productioncapacity, product quality and follow-up sorting operations concentrate gradeand recovery of technical and economic indicators of the level.
Grading process can be divided intogravitational hydraulic grading, centrifugal grading and high-frequencyfine-grading three categories. Hydraulic classification of particles in thewater by the role of gravity or centrifugal force, according to the settlementof the final velocity distribution of grading methods, including spiralclassifier, hydrocyclone, wind classifier. Fine sieve grading is in strictaccordance with the particle size of grading operations. In recent years,beneficiation grading process transformation, are to make the grading processcan be better and stable.
(1) Spiral classifier classification
The use of small and medium-sized ball millconcentrator, for economic and production stability considerations, a grindingclosed-circuit grading still tend to use the spiral classifier. Liu Shu et al.Reported on the hydrocyclone in Chengchao ore dressing plant grading system ofindustrial tests. Cheng Chao concentrator a closed-circuit grinding system atotal of 6 series, 1-4 series of 2.7m3.6m ball mill and 2000mm double helixclassifier closed system.
(2) Hydrocyclone classification
Hydrocyclones are a high-efficiencygrading, desliming equipment. Because of its simple structure, easy tomanufacture, large capacity, has been widely used at home and abroad, the maindrawback is the larger consumption power. Fine classification is in strictaccordance with the particle size size of the grading operation, it can solvethe hydraulic grading useful mineral density easily muddy, small density ofnon-monomer gangue dissociation problem.
(3) A variety of grading equipment joint classification
Reduced iron project requirements vanadiumtitanium magnetite iron grade cannot be less than 56%.