For improving the strength of pellets made of ultrafine and super-high-grade magnetite concentrates, the influence of basicity (CaO/SiO₂ ratio) on the roasting and consolidation of pellets was investigated. The results showed that with the basicity of pellets increasing from 0.09 to 0.60, the compressive strength of both preheated and roasted pellets achieved an evident improvement from 502 and 2519 to 549 and 3096 N/pellet, respectively; meanwhile, the roasting time decreased from 15 to 9 min. The low-viscosity liquid phases were easily generated in fired pellets at the basicity range of 0.40–0.60 under the roasting temperature of 1240 °C, filled the voids between hematite particles and tightened the bonding among particles, effectively restraining the generation of concentric cracks and decreasing the porosity of fired pellets; low-viscosity liquid phases facilitated the solid diffusion of hematite, leading to the formation of coarse hematite crystals and thicker connecting necks.

为了提高由超细和超高品位磁铁矿精矿制成的球团的强度，碱度的影响（CaO / SiO ₂比例）对颗粒的焙烧和固结进行了研究。结果表明，随着颗粒度从0.09增加到0.60，预热和烘烤颗粒的抗压强度分别从502和2519分别提高到549和3096 N /粒；同时，烘烤时间从15分钟减少到9分钟。在1240°C的焙烧温度下，在0.40–0.60的碱度范围内，低粘度液相易于在烧结的球团中生成，填充了赤铁矿颗粒之间的空隙并加强了颗粒之间的结合，有效地抑制了同心裂纹的产生。降低烧结颗粒的孔隙率；低粘度液相促进了赤铁矿的固体扩散，