A method of increasing brown iron ore grade of beneficiation method comprising the steps of:

1. Grinding: The raw ore is ground into a ball mill to -200 mesh, accounting for 96% to 99%, and the pulp concentration is 50% to 60%. Then it is graded by a spiral classifier and enters the -200 mesh high-frequency vibrating screen. The concentration of the slurry after sieving is adjusted to 20% to 25%, and the unscreened ore is returned to the regrind;

2. Re-election: the above slurry is sent to the spiral chute for rough selection, selection and secondary selection;

a. Rough selection: Desliming the slurry, the concentration of the slurry discharged from the concentrate and the middle mine is 15% to 25%, and enters the selection. The slime and part of the tailings of the spiral chute are discharged into the tailings pond. ;

b. Selection: Desliming and selecting the slurry, intercepting the concentrate from the concentrate, and adjusting the concentration of the medium slurry discharged from the mine to 15% to 25%, entering the second selection, the outer edge of the spiral chute Sludge and part of tailings discharged into the tailings pond;

c. Second selection: re-de-sludge and select the slurry, intercept the concentrate from the concentrate, and adjust the concentration of the medium slurry discharged from the mine to 15%~25% to enter the reverse flotation, spiral chute The outer margin of the slime and part of the tailings are discharged into the tailings pond;

3. Reverse flotation: Add 100g ~ 200g / t of inhibitor to the medium pulp after adjusting the concentration, 100g ~ 150g / t of the collector , stir for 2-3 minutes, under normal temperature, pH = 7 Flotation takes 10 to 12 minutes to obtain a high grade limonite concentrate.

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