【摘要】 石灰在炉渣中快速溶解以迅速提升炉渣碱度对炼钢高效脱磷和节能降耗十分重要。通过高温溶解实验和渣-金反应脱磷实验开展了石灰和石灰石在炉渣中溶解脱磷行为的对比研究。结果表明:石灰加入熔渣初期溶解迅速,随后溶解速率逐渐下降。石灰石在溶解的初期由于大量Ca CO3分解产生的CO2阻碍了渣和分解后形成的表面石灰层的接触,导致前期溶解缓慢,后期CO2起到了很好的加快石灰溶解的作用。脱磷反应与渣中Ca O含量快速提升有着重要的关联性,石灰由于后期溶解缓慢,导致脱磷速率不高,金属液中的磷含量较高。在石灰石造渣脱磷前期脱磷效率不高,后期由于石灰石加快溶解,脱磷反应传质系数较前期提高约11.6倍,较石灰造渣脱磷提高约6.6倍。更多还原

【Abstract】 The rapid dissolution of lime in molten slag to improve the slag basicity contributes to the efficient dephosphorization and energy saving during steelmaking. The comparative study on the dissolution and dephosphorization behavior of lime and limestone in slag was conducted through high-temperature dissolution experiments and slag-metal reaction dephosphorization experiments. Results show that lime dissolved rapidly in the initial stage after added into molten slag, followed by a gradual decrease in dissolution rate and almost stagnation in the later stage. In the initial stage of limestone dissolution, a large amount of CO2 generated by the decomposition of Ca CO3 hinders the contact between the slag and the surface Ca O layer formed by Ca CO3 decomposition, thereby hindering the penetration of slag into the lime layer and the dissolution of lime. The CO2 generated by later decomposition plays an important role in accelerating the dissolution of lime. There is an important correlation between the dephosphorization reaction and the rapid increase in Ca O content in the slag. Due to the slow dissolution of lime in the later stage, the dephosphorization rate is lower, and the phosphorus content in the liquid metal is relatively higher. During the dissolution of limestone for dephosphorization, the Ca O content in the slag increases more slowly than lime due to slow dissolution in the early stage, which leads to a slightly slower mass transfer coefficient of dephosphorization reaction in the early stage compared with the test of lime. In the later stage, because of the accelerated dissolution of limestone, the mass transfer coefficient in the dephosphorization reaction increases by about 11.6 times compared with that in the early stage and about 6.6 times higher than that in the test of lime.更多还原