铁酸钙熔体对赤铁矿的渗透行为及对烧结强度的影响

考察了铁酸钙熔体添加SiO2或Al2O3对赤铁矿渗透行为的影响.采用以铁酸钙为粘结相的烧结赤铁矿试样,考察在铁酸钙中添加SiO2或Al2O3对烧结试样抗折和抗压强度的影响.试验结果表明,添加SiO2和Al2O3抑制了铁酸钙熔体对赤铁矿的渗透行为.在1300℃,恒温20min条件下,在铁酸钙中添加质量分数为2%的SiO2的烧结赤铁矿有最大的抗折和抗压强度,这是由于添加了SiO2的铁酸钙具有较短的熔化时间和较好的渗透性,在烧结过程中充分形成流动性好的液相,提高了粘结相固结铁矿石颗粒的作用.

Effect of Penetration Behavior of Calcium Ferrite Melts into Hematite on the Strength of Sinter

The effects of penetration behavior of the calcium ferrite (CaO·Fe2O3 or CF) melts to which SiO2 or Al2O3 has been added on the sintered hematite as matrix to be penetrated was investigated experimentally, as well as its effect on the compressive and rupture strength of sinter specimens. The results showed that the penetration of the CF-based melts into sintered hematite was suppressed by the additive SiO2 or Al2O3. The sintered hematite with CF to which 2 wt% of SiO2 was added at 1300°C and held for 20 min can offer the highest compression and rupture strength because the melting time of CF melts with SiO2 added in is shorter with penetrability improved, thus forming sufficiently the liquid phase with high liquidity in sintering process to enhance the consolidation effect between adhesion phase and iron ore particles.