关键词: 预选抛废, 干式磁选, 湿式磁选

Abstract: In order to efficiently and rationally develop and utilize a low-phosphorus and low-sulfu⁃ ric acid iron ore in Anhui Province，based on the study of ore properties，the experimental study on the pre-concentration and discarding of iron ore is carried out.The results show that the 0～65 mm size frac⁃ tion of raw ore is discarded by dry low intensity magnetic separator. After discarding，the rough concentrate is crushed to 0～12 mm，and the dry magnetic separation discarding and wet magnetic separation discard⁃ ing are carried out respectively. The discarding effect of wet magnetic separation is better，and the iron concentrate with iron grade of 47.09% and iron recovery rate of 95.98% is obtained. The iron grade of tail⁃ ings is reduced to 12.28%，and the recovery rate of magnetic iron lost only 1.10%.The 0～65 mm fraction of raw ore is discarded by dry low intensity magnetic separator. After discarding，the rough concentrate is rolled to 0～6 mm for wet magnetic separation discarding. The permanent magnet drum coarse magnetic separator and ordinary medium field strength magnetic separator are used respectively. The ordinary medi⁃ um field strength magnetic separator has better discarding effect，and the iron concentrate with iron grade of 50.59% and iron recovery rate of 94.35% is obtained. The iron grade of tailings is reduced to 11.31%， and the recovery rate of magnetic iron only loses 0.76%.The concentrate after dry discarding is first broken to 0~6 mm，and then wet discarding with medium field strength is carried out. The iron grade of the con⁃ centrate obtained is high，the loss of magnetic iron in tailings is less，and the effect is better.

Key words: pre-concentration and waste discarding, dry magnetic separation, wet magnetic separa? tion