Tailing treatment process in poor magnetic iron ore beneficiation process

The invention relates to a tailing treatment process in a poor magnetic iron ore beneficiation process. The tailing treatment process comprises the following steps: a poor magnetic iron ore is fed in a high-pressure grinding roller and a screening machine for a closed-circuit grinding operation; a screened product of the screening machine is fed to a roughing magnetic separator; and a concentrate thereof is fed to a subsequent operation. The tailing treatment process is characterized by further comprising the following steps: a tailing of the roughing magnetic separator is fed to a concentration cyclone; a underflow product of the concentration cyclone is fed to a tailing dehydration sieve; an overflow product of the concentration cyclone, a screened product of the dehydration sieve and a tailing in a subsequent separation operation are all fed to a tailing concentrator for a concentration operation; a underflow product of the tailing concentrator is fed to a tailing press filter for filtration; and an unscreened product of the dehydration sieve and a filter cake of the tailing press filter are fed to a tailing dry discharge belt conveyer for conveying to a tailing storage yard or a tailing pond for storage. The tailing treatment process has the following advantages: the dry discharge treatment is performed for a thick-particle tailing in nearly one half of the separation process, and the rest tailing is concentrated and filtered to realize the tailing dry discharge, so that the tailing treatment process in the poor magnetic iron ore beneficiation process is comprehensively optimized.