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采用微型烧结装置对进口高铬型钒钛磁铁矿以及现场实际使用的若干种烧结用铁矿粉的烧结基础特性进行了系统研究,为高铬型钒钛磁铁矿烧结配矿提供理论依据和技术参数。试验结果表明,不同铁矿粉的烧结基础特性差异较大。在所研究的铁矿粉中,进口高铬型钒钛磁铁矿粉的同化温度高(1 335℃)、液相流动性差(流动性指数1.95)、粘结相自身强度弱(抗压强度1 445N)、连晶固结强度差(抗压强度365N);而国产混合粉的同化温度适中(1 291℃)、液相流动性好(流动性指数4.20)、粘结相自身强度相对高(抗压强度2 010N)、连晶固结强度稍好(抗压强度622N)。从烧结基础特性角度出发,基于本企业当前的原料条件,进行高铬型钒钛磁铁矿烧结生产时,应尽可能与国产混合粉搭配使用。
The sintering characteristics of the imported high-chromium vanadium titanomagnetite and several kinds of sintered iron ore powders used in the field were studied systematically by means of micro-sintering equipment to provide the theoretical basis for the sintering and ore blending of high-chromium vanadium-titanium magnetite And technical parameters. The test results show that different iron ore powder sintering basic characteristics vary greatly. In the study of iron ore powder, the import of high chromium vanadium titanomagnetite powder high assimilation temperature (1 335 ℃), the liquid flow is poor (mobility index 1.95), the bonding phase itself weak (compressive strength 1 445N), even the crystal consolidation strength is poor (compressive strength of 365N); while the domestic mixed powder assimilation temperature is moderate (1 291 ℃), the liquid flow is good (fluidity index 4.20), the bond phase strength is relatively high (Compressive strength 2 010N), even the crystal consolidation strength slightly better (compressive strength 622N). From the perspective of the sintering basic characteristics, based on the current raw material conditions of the enterprise, the production of high-chromium vanadium-titanium magnetite should be used with the domestic mixed powder as much as possible.