A beneficiation process for underground low-grade iron ore combined with magnetic gravity to improve quality and reduce tails
A low-grade iron ore, magnetic-gravity combined technology, applied in magnetic separation, centrifuge, solid separation, etc., can solve the problems of insignificant increase in concentrate grade, high tailings grade, metal loss, etc., and achieve perfect tailings indicators , The effect of improving concentrate grade and reducing metal loss
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Embodiment 1
[0040] Example 1——Underground low-grade ore test
[0041] 1. Test sample preparation and properties
[0042] The selected raw ore is underground low-grade ore, and the samples taken are subjected to coarse crushing-medium crushing-shrinkage-fine crushing-shrinkage respectively to prepare several equivalent test samples and preparation samples. The specific sample preparation process is as follows: Figure 4 .
[0043] Take 1 part of the test sample, mix it, shrink it, grind it, and send it to the laboratory. The raw ore grade and magnetic iron are shown in Table 1.
[0044] Table 1 Raw ore grade
[0045]
[0046] It can be seen from Table 1 that the TFe grade of the underground low-grade ore is 26.63%, the mFe grade is 15.86%, and the magnetic occupancy rate is 59.56%; the samples taken are representative.
[0047] 2. The main equipment of the test
[0048] Table 2 The main equipment of the test
[0049]
[0050] 3. Underground low-grade ore upgrading and tailing gr...
Embodiment 2
[0094] A beneficiation process for underground low-grade iron ore with magnetic gravity combined with quality improvement and tail reduction, including one-stage grinding, one-stage weak magnetic separation, one-stage strong magnetic separation, second-stage grinding, second-stage weak magnetic separation, three-stage strong magnetic separation, Centrifuge selection steps include:
[0095] The pretreatment step is carried out first. The pretreatment is to carry out coarse crushing, medium crushing and fine crushing of the underground low-grade iron ore raw ore. Specifically, the jaw crusher is used for coarse crushing, and the particle size range after coarse crushing is 6-38mm , and then use the roller crusher for intermediate crushing, and finally use the roller crusher for fine crushing again, and the particle size range after fine crushing is 5-15mm. The raw ore grade of the underground low-grade iron ore is 26.5% TFe grade, 15.5% mFe grade, and 59.5% magnetic occupancy ra...
Embodiment 3
[0105] A beneficiation process for underground low-grade iron ore with magnetic gravity combined with quality improvement and tail reduction, including one-stage grinding, one-stage weak magnetic separation, one-stage strong magnetic separation, second-stage grinding, second-stage weak magnetic separation, three-stage strong magnetic separation, Centrifuge selection steps, including:
[0106] The pretreatment step is carried out first. The pretreatment is to carry out coarse crushing, medium crushing and fine crushing of the underground low-grade iron ore raw ore respectively. Specifically, the jaw crusher is first used for coarse crushing, and the particle size range after coarse crushing is 10-30mm , and then use the roller crusher for intermediate crushing, and finally use the roller crusher for fine crushing again, and the particle size range after fine crushing is 5-10mm. The raw ore grade of the underground low-grade iron ore is 25% TFe grade, 14% mFe grade, and 58% magn...
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