In order to increase the production of Autogenous grinding system and separation capacity of magnetic separators in Sino Iron beneficiation plant,changes the single cylinder cone crusher into heavy multiple cylinder cone crusher with the P80 about 14 mm of crushed product,decrease the weight of the AG mill liner by 230 t with the increase of AG mill inside material mass and milling efficiency,replace the cone cyclone with flat cyclone with the increase above 70% of classification efficiency and the decrease below 200% of circulating load,change the magnetic separators to elutriation with the increase by 5 μm of ball mill product,control the AG mill new feed size more than 150 mm of F80.Based on these measurements,solves the bottlenecks of production improvement in each production period and realize the increase of the production of Sino Iron beneficiation plant year-by-year,with an annual operating rate of 90%,an annual single-line average autogenous grinding new feed with the increase from 1 000 t/h to 1 300-1 400 t/h,and a stable iron ore concentrate grade of around 65%.In addition,considering the intensified crushing practice of double-cone crushers at the same time,the beneficiation plant has found a solution for future production improvement.The application of elutriation has provided ideas for the enhanced separating of upstream magnetic separation operations.