Method for recycling weakly magnetic iron ore from fine-fraction waste rock

The invention discloses a method for recycling weakly magnetic iron ore from fine-fraction barren rock, which comprises the following steps of: 1) screening 0-5mm barren rock with the iron grade of 15-18% and thrown out by dry pre-selection of a mine into two fraction ranges of 0-1mm and 1-5mm by using a linear vibrating screen; (2) carrying out one-roughing and one-sweeping wet-type deep enrichment and waste throwing on the weakly magnetic refractory iron ore in a size fraction range of 0-1mm by adopting a high-gradient electromagnetic separator with a medium rod gap of 2mm, wherein the field intensity is 11000GS; 3) performing one-roughing and one-sweeping wet-type enrichment waste throwing on the weakly-magnetic refractory iron ore in a size fraction range of 1-5mm by adopting a high-gradient electromagnetic separator with a medium rod gap of 8mm, wherein the field intensity is 14000GS, and 4) combining pre-selected concentrates obtained in the step 2) and the step 3) and feeding the pre-selected concentra