In order to expand the raw material structure of the belted burning machine and reduce the production cost of pellets, the particle size performance of the concentrate is made fully used and the grindability of mineral powder is improved by optimizing the pellets process path, introducing an online grinding process to use limonite powder for pellet production, and using the combined grinding method of concentrate and rich ore powder for industrial tests. The results show that different limonite powders will affect the filter press process, and the pellets grinding structure of M and P fine ores combined with PC concentrate is better than that of N and B fine ores. When the proportion of limonite powder is 33%-35%, the internal return rate of fresh pellets increases slightly with the increase of fine ore consumption, and the consumption of bentonite decreases with the increase of fine ore consumption. The application of limonite powder has little effect on the compressive strength of the pellets, the reducibility of the pellets is slightly improved, and the reduction expansion index is slightly reduced; because the aluminum-containing clay in the limonite powder plays a bonding role in the green pellets, the incorporation of limonite powder helps to reduce the amount of bentonite. Production practice shows that the grinding scheme of 20% PC concentrate + 20% PM concentrate + 60% M fine ore is the best production scheme, and the limonite proportion in the pellets is 33%, which can achieve zero bentonite pelletizing, and the annualized benefit is about 10.93 million yuan.