高配比高铝褐铁矿烧结成矿机理

Metallogenic mechanism of sintering of high ratio of high alumina limonite

以某高铝褐铁矿配比为60%~70%，配加其他含铁原料进行烧结，通过调节水碳、优化配矿等措施改善烧结产质量指标，并对烧结成矿机理进行分析。实验结果表明：Fe2O3和Al2O3分别与CaO反应时，2CaO·Fe2O3比3CaO·Al2O3及12CaO·7Al2O3更容易生成；当CaO，Al2O3，SiO2和Fe2O3四元矿物存在时，烧结过程优先生成2CaO·Al2O3·SiO2（钙铝黄长石）和4CaO·Al2O3·Fe2O3，并进一步形成SFCA，这与烧结矿SEM结果相一致；虽然烧结矿具有较多的孔洞和裂纹，但烧结矿具有良好的微观结构和冶金性能，可以满足中、小型高炉冶炼的生产要求。

Sintering test of Indonesian high alumina limonite matching with other iron-containing materials was carried out and the sintering yield and quality indicators were improved by optimization of ore matching, regulation of alkalinity and blending lime. The sintering metallogenic mechanism was studied. The results show that when Fe2O3 and Al2O3 react with CaO respectively, 2CaO·Fe2O3 is much easier to be formed than 3CaO·Al2O3 and 12CaO·7Al2O3. When CaO, Al2O3, SiO2 and Fe2O3 coexist in the sintering process, they are more likely to form ternary compound of 2CaO·Al2O3·SiO2 and 4CaO·Al2O3·Fe2O3 firstly, and SFCA is formed in the further reactions, which is consistent with the SEM results. It has more holes and cracks, but it can still meet the requirement of small and medium sized blast furnace （BF） smelting because of its fine microstructure and metallurgical property.