在制粒过程中,铁矿粉与水的接触角不但影响渗入颗粒孔中的水量,也影响颗粒表面能够将颗粒黏接到一起的水量,接触角对制粒过程和制粒后生球的粒度、强度都有决定性的影响。用渗透法测量了10种来自不同地区的铁矿粉与水的接触角,分析发现铁矿粉接触角与其化学成分密切相关,其关系可表示为：θ=0.24x-1.94y＋65.40,θ表示接触角,x和y分别表示铁矿粉中赤铁矿的体积分数和烧损。接触角随铁矿粉中赤铁矿的体积分数的增多而变大,随烧损的增大而减小。赤铁矿体积分数和烧损的标注化回归系数分别为0.34和-0.66,烧损对接触角的影响作用较为显著。
For granulation operations,the ore contact angle affects both the amount of liquid absorbed into the pores of the particles and the amount of liquid required to successfully bond the particles together.Contact angle between iron ore and liquid has a decisive impact on both granulation process and properties of green pellets.The water contact angles of 10 different iron ores were measured by penetration method.An approximately correlation was found between the contact angle and the ore composition given by θ=0.24x-1.94y+65.40,where θ is the contact angle,x and y represent the volume fraction of hematite and burning loss of the ore.Contact angel increases with volume fraction of hematite,decreases with burning loss of the ore.The standardized regression coefficient of hematite fraction and burning loss are 0.34 and-0.66 respectively,the influence of burning loss is comparatively remarkable.
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