Spiral classifier leads the test in ore beneficiation process

The experts of Henan Hongxing Mining Machinery have done the magnetic separation test for the sand return of the spiral classifier with different size fractions to examine the separation indexes, as well as different size fractions concentrate grade of the tailings. When the grading overflow particle size of 200 mesh takes up 40%, the sand which contains 40% to 41% iron can be full-grain magnetically sorted without screening. When the sorting field strength is 0.18, you can sort out the tailings which contain 17.58% iron. The productivity of the tailings is 28.32%. It shows that the direct sand return with the full grain is difficult to sort out the tailings. In addition, the productivity is low.

When the return sand is screened by the sieve pore of 0.45mm, the coarse particles of 0.45mm on the sieve contain about 32% iron. When the field strength is 0.13, the tailings which contain 12.04% and whose productivity is 7.87% can be sorted by the magnetic separation.

The coarse particles more than 0.45mm in the return sand can be sorted. The fine particles under the sieve can be sent for magnetic separation in the grading overflow of the magnetic separation system. When the classifying return sand is screened by the high-frequency fine screen of 0.4mm, the materials on the sieve take up 60.47% and they return to the ball mill for grinding again. The materials take up 39.53% and they merge with the classifying overflow for magnetic separation. When the raw ore contains 31.59% iron, the grade of the concentrate more than 52% can be got. The productivity of the concentrate is 47.44% and the iron recovery is more than 8%.

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After the comprehensive comparison, the experts of Henan Hongxing Mining Machinery think that the separation of the materials under the sieve with the return sand is more superior. The spiral classifier produced by Henan Hongxing Mining Machinery can be used for the same grinding equipment to compose the closed-circuit operation. It can also be used to wash ore, dehydration and desliming. The main feature is to use the helical blade with continuous rotation to lift and transport the grit.

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