基于“同化性特征数”分析影响铁矿粉同化性的因素

Influencing factors of the assimilation of iron ore powder based on the “assimilation characteristic number ”

试验采用“同化性特征数”表征铁矿粉的同化性能的方法，综合考虑了同化过程的全部参数，并结合了烧结生产的实际温度，因而具有更高的准确性与操作性.选取10种铁矿粉，配碳量4%，粒径0.3～0．6 mm，运用铁矿粉“同化性特征数”的测定方法，得到各自的同化性特征数，并结合铁矿粉的理化性能分析了铁矿粉同化性能的影响因素，结果发现：不同种类的铁矿粉同化性特征数差别较大，影响因素主要有铁矿粉种类，矿粉化学成分，烧损以及铁矿粉微观形貌等，一般来说，褐铁矿或赤铁矿同化性较好；SiO2对铁矿粉同化性能无明显影响；随着Al2O3与MgO含量的增高，铁矿粉同化性先变大后变小，而上述2种成分含量适中时同化性最强；铁矿粉的同化性与其烧损呈正相关；铁矿粉微观形貌为疏松豆状组织时同化性较强，为致密块状组织时同化性较弱.

Combined with the actual temperature of sintering production and comprehensively taking the assimilation process parameters into consideration, the “assimilation characteristic number” is used to characterize the iron ore powder assimilability in tests, which is more accurate and more feasible. Ten kinds of iron ore powder containing 4 % Jing De coke of 30~ 50 purpose are selected, and the “assimilation characteristic number” is used to characterize their assimilability to determine their respective assimilation characteristic parameters and to analyze their influence factors by combining with their physico-chemical properties. The results show that different kinds of iron ore powder have significant different assimilation characteristic parameters; the major influencing factors include the types of iron ore powder, chemical composition, burning loss and microstructure, etc. Generally speaking, limonite and hematite have good assimilability; SiO2 has no obvious influence on assimilability; with increasing of the content of Al 2O3 and MgO, the assimilability increases at first and then decreases, and the powder has the strongest assimilability when the two component contents are moderate; assimilability correlates positively with the burning loss; the powder with loose granular organization has strong assimilability, and powder with dense block organization has weak assimilability.