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为适应我厂小高炉冶炼强度大、冶炼周期短(2～2.5小时)的特征,我们进一步加强了球团的整粒工作,进一步缩小了球团的粒度变化范围。一九七七年九月七日对原18辊圆辊筛进行了改造,辊径由原来的φ100毫米增加至φ103毫米,筛辊间隙由原来的8毫米缩小至5毫米,粒度下限控制在大于5毫米以上,
In order to adapt to the characteristics of small blast furnace smelting strength and short smelting period (2~2.5 hours) in our factory, we further strengthened the pelleting work and further narrowed the pellet size range. On September 7, 1977, the original 18-roller circular roller screen was rebuilt. The diameter of the roller increased from φ100 mm to φ103 mm. The gap between the rollers was reduced from 8 mm to 5 mm. The lower limit of particle size was controlled to be larger than 5 mm above,