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为了研究细磨对矿粉特性和造球性能的影响,利用球磨机对某种粒度较粗的矿粉进行不同程度的细磨,然后按照不同的配比进行混合,制成11种不同粒度组成的矿粉试样,对11种矿粉进行物理性能测试和造球试验。结果表明,随着磨矿时间的延长,细磨后矿粉颗粒形貌变化不大,但细颗粒质量分数增多,矿粉的比表面积增加,毛细水质量分数增加,而分子水质量分数无明显变化规律。矿粉的比表面积与矿粉中细微颗粒(小于10μm)的质量分数有很大关系。生球的落下强度由比表面积和粒度组成共同决定,当矿粉比表面积为1 500~2 500 cm2/g时,矿粉中大于76.33和小于10μm粒级的质量分数为10%~15%,有利于造球和生球落下强度的提高。
In order to study the effect of fine grinding on the characteristics of ore powder and the performance of pelletizing, the ball mill was used to finely grind some kind of coarse ore powder with different degrees and then mixed according to the different proportions to make 11 kinds of different particle sizes Mineral powder samples, the physical properties of 11 kinds of mineral powder and pelletizing test. The results showed that the morphologies of the ground ore particles did not change much after grinding, but the content of fine particles increased, the specific surface area of the ore powder increased, the capillary water mass fraction increased but the molecular water fraction did not The law of change. The specific surface area of the slag is closely related to the mass fraction of fine particles (less than 10μm) in the ore powder. The dropping strength of green balls is determined by the specific surface area and particle size composition. When the specific surface area is 1 500 ~ 2 500 cm2 / g, the mass fraction of larger than 76.33 and smaller than 10 μm in the slag is 10% ~ 15% Conducive to pelletizing and ball drop strength to improve.