Method for recovering magnetite in brown iron ore concentrate
A technology for magnetite and magnetite concentrate, applied in chemical instruments and methods, magnetic separation, high-gradient magnetic separators, etc., can solve the problems of waste of resources, pollute the environment, low economic benefits, etc., and achieve the effect of improving recovery efficiency
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Embodiment 1
[0025] (1) Adjust the cyanide tailings to a 25% slurry;
[0026] (2) Under the condition of the magnetic field strength of 230mT, the slurry in the step (1) is subjected to weak magnetic roughing with a semi-countercurrent drum magnetic separator to form magnetite concentrate A and tailings A;
[0027] (3) Under the condition that the magnetic field strength is 180mT, the magnetite concentrate A produced in step (2) is subjected to weak magnetic separation with a semi-countercurrent drum magnetic separator to form magnetite concentrate B and magnetite medium ore;
[0028] (4) Sweep the tailings A produced in step (2) and the magnetite medium produced in step (3) with a semi-countercurrent drum magnetic separator under the condition of a magnetic field strength of 370mT to form a magnet concentrate A' and tailings B;
[0029] (5) The magnetite concentrate A' produced in the step (4) is mixed into the magnetite concentrate A to carry out the step (3) treatment;
[0030] (6) Un...
Embodiment 2
[0037] (1) Adjust the cyanide tailings to a 35% slurry;
[0038] (2) Under the condition of the magnetic field strength of 180mT, the slurry in the step (1) is subjected to weak magnetic roughing with a semi-countercurrent drum magnetic separator to form magnetite concentrate A and tailings A;
[0039] (3) Under the condition that the magnetic field strength is 140mT, the magnetite concentrate A produced in step (2) is subjected to weak magnetic separation with a semi-countercurrent drum magnetic separator to form magnetite concentrate B and magnetite medium ore;
[0040] (4) Sweep the tailings A produced in step (2) and the magnetite medium produced in step (3) with a semi-countercurrent drum magnetic separator under the condition of a magnetic field strength of 320mT to form a magnet concentrate A' and tailings B;
[0041] (5) The magnetite concentrate A' produced in the step (4) is mixed into the magnetite concentrate A to carry out the step (3) treatment;
[0042] (6) Un...
Embodiment 3
[0050] 1. Determination of iron index in the original production mode
[0051] The identified iron concentrate samples were taken from the magnetic separation products of a gold beneficiation plant in Yunnan after all-slime cyanidation. The grade of the magnetite concentrate was 63.29%, the yield rate was 2.88%, the iron recovery rate was 6.72%, and the limonite concentrate was 63.29%. The ore grade is 50.95%, the yield rate is 16.79%, and the iron recovery rate is 31.54%; the calculation results of the particle size recovery rate of iron are shown in Table 1:
[0052] Table 1 Calculation results of iron fraction recovery rate
[0053]
[0054] The metal occupancy rate in the above table refers to the percentage of recovered metals to the original ore metals.
[0055] The calculation results of the recovery rate of magnetic separation products show that the metal occupancy rate of ≤0.02mm particle size in the magnetite concentrate is 0.017%, which is basically not recovered,...
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