In response to such problems as poor pelletizing performance and poor sintering performance of concentrates in the State of Liberia in conventional sintering process, the granulation performance and sintering performance of the composite agglomeration process are studied from such conditions as moisture, fuel consumption, flux structure, matrix material, pelletizing material, etc., and compared with the conventional sintering process. The results show that the sintering performance of concentrates in the State of Liberia is significantly improved when the composite agglomeration process parameters are as follows: the moisture of the matrix material is 8.5%, the amount of fuel is 4.5%, the alkalinity of the composite material is 1.30, the amount of return fine is 25%, w(MgO) is 1.5%, the amount of quicklime is 7.8%, the amount of pelletizing is 40%, and the diameter of the pelletizing is 8～10 mm. Compared with the conventional sintering process, the yield of composite agglomeration process is increased from 67.81% to 76.15%, the drum strength is increased from 63.00% to 76.82%, the utilization coefficient is increased from 1.03 t/(m²·h) to 1.41 t/(m²·h), and the solid fuel consumption is reduced from 63.81 kg/t to 52.38 kg/t. The microstructure shows that the matrix material phase of composite agglomeration has more needle-like and flaky calcium ferrate, and the pelletizing material phase is dominated by the better oxidized Fe₂O₃, and the less oxidized Fe₃O₄, while the microstructure is denser, which promotes the improvement of the sinter strength.