ABSTRACT

In view of the similarity between the partition curve of coal preparation and the cumulative curve of distribution function, the quartile of random distribution is often used to describe the characteristics of partition curve, the median being the separation density, quartile deviation being the probable error, quartile measure of skewness reflecting the asymmetry of the partition curve. With the help of the properties of linear interpolation and distribution function, a generalized skew-normal distribution model of partition curves based on quartile and other auxiliary parameters was built which have four or five parameters including separation density, probable error and quartile skew coefficient and so on. The introduced auxiliary parameters have a good correction to the tail of the curve. The model shows very good fitness for the partition coefficient data.

摘要

鉴于选煤配分曲线与分布函数累积曲线的相似性，常采用随机分布四分位数来描述配分曲线的特征，中位数为分离密度，四分位数偏差为可能误差，反映分配曲线不对称性的四分位偏度度量。借助线性插值和分布函数的性质，建立了基于四分位数和其他辅助参数的分区曲线的广义偏正态分布模型，该模型具有分离密度、概率误差和四分位数偏斜系数等四个或五个参数。上。引入的辅助参数对曲线尾部有很好的修正。