The invention relates to the technical field of metallurgic mineral separation and provides a mixed flocculating agent capable of accelerating 
settling of superfine grain tailing 
flocculation and application thereof. According to the mixed flocculating agent, firstly from 13 million to 14 million, by molecular weight, of 
polyacrylamide is prepared into a water solution with 
mass faction from 0.05% to 0.3%, then the water solution is mixed uniformly with 
quartz sand from 20 to 40 grits or iron rough concentrate according to the 
mass ratio 
ranging from 0.3:1 to 6:1, and the flocculating agent is obtained; by means of the mixed flocculating agent, the 
settling time and the 
settling efficiency of superfine grain tailing can be accelerated, the 
water quality of separating medium is improved obviously, so that the separating medium generated in the 
flocculation process can be recycled and reused as mineral separation used water, and the flocculating agent usage is greatly reduced (by about from four to ten grams per 
ton of dry ore); meanwhile, a novel superfine grain tailing 
flocculation settling technology is provided, the superfine grain tailing flocculation 
settling time is greatly shortened, the production efficiency is enhanced, the problem that 
water content stays at a high level after the superfine grain tailing concentrates is solved, a new process 
route is provided for the superfine grain tailing dry 
pile technology, and prominent contributions are made to environment protection and comprehensive utilization of resources.