Design of Grinding Aid in Dry Ultrafine Grinding

利用振动磨研究了助磨剂对不同样品超微粉碎的影响。所用样品有长石、石英、氧化铝和石灰石，主要采用不同烷基醇作为助磨剂。考察了产品比表面积随磨削时间和助磨剂用量的变化。通过多变量分析，探讨了助磨剂物理性能与产品比表面积之间的关系。得到的主要结果如下：1.实验结果表明：助磨剂的助磨效果随醇的种类和醇的添加量的不同而有显著差异，但所有醇都是有效的助磨剂。2. 过度的磨削反过来又降低了产品的比表面积。3. 助磨剂的最有效用量随试样细度的增大而增大。4. 助磨剂1-丁醇和甲醇对长石和石英的助磨效果最好。5. 酒精助剂的加入增加了产品的流动性。6. 在助磨剂的物理性能中，偶极矩与分子体积之比、蒸汽压和表面张力与产品的比表面积密切相关。

The effect of grinding aids on the ultrafine grinding of various samples was studied by using a vibrating mill. Samples used were feldspar, quartz, alumina and limestone and alcohols with different alkyl groups were mainly used as the grinding aids. The variations in specific surface areas of the products were examined with grinding time and amount of grinding aid. The relationships between the specific surface area of products and the physical properties of grinding aid were also invetigated by means of a multivariate analysis.The principle results obtained are as follows : 1. The effect of grinding aids varied remarkably with the kinds of alcohols and the amount of alcohol added, though all alcohols were effective grinding aids. 2. The excessive grinding conversely decreased the specific surface area of products. 3. The most effective amount of grinding aid increased with the fineness of samples. 4. The grinding aids of 1-Butanol and methanol were most effective for feldspar and quartz, respectively. 5. The addition of alcohol aids increased the flowability of products. 6. In the physical properties of grinding aids, the ratio of dipole moment to molecular volume, vapor pressure and surface tention were closely related to the specific surface area of products.