麻黄梁煤矿矸石破碎粒度与化学成分相关性研究

Correlation between particle size and chemical composition of crushed gangue from Mahuangliang Coal Mine

为研究矸石破碎后粒度差异对矸石组分分布的影响,以麻黄梁煤矿矸石为研究对象,通过筛分、研磨、化学成分测试等手段,研究了矸石经过颚式破碎后的粒径分布规律及不同排矿口宽度和粒度条件下主要化学成分变化情况。结果表明:随着排矿口宽度增大,矸石粒径分布模型中特征粒径具有对数上升趋势,均匀性指数具有指数下降趋势。各粒径的矸石成分组成也随粒度发生变化:随着排矿口宽度增加,各成分的分配率受影响程度不一,含CaO和MgO的矸石颗粒,在粗粒级产品中富集;含Fe_(2)O_(3)的颗粒逐渐由细粒级向粗粒级集中;含有Al_(2)O_(3),SiO_(2),C的颗粒更易破碎并在细粒级产品中富集。且随着矸石颗粒粒度的增大,各成分的分配率表现为先上升再下降的规律,富集比随粒度变化的趋势符合y=a+b×c^(x)形式。

In order to study the influence of grain size difference on the distribution of gangue components after crushing,taking gangue from Mahuangliang Coal Mine as the research object,the grain size distribution law of gangue after crushing was studied by means of screening,grinding,chemical composition testing and other means,and the change of main chemical composition of gangue under different width of discharge port and grain size was analyzed.The results show that the characteristic grain size of gangue grain size distribution model has a logarithmic increasing trend and the uniformity index has an exponential decreasing trend with the increase of the drainage port width.The composition of gangue also changes with the grain size.With the increase of the width of the discharge port,the distribution rate of each component is affected to different degree.Gangue particles containing CaO and MgO are enriched in coarse-grained products.The particles containing Fe_(2)O_(3)gradually concentrates from fine to coarse.Particles containing Al_(2)O_(3),SiO_(2)and C are more likely to be broken and enriched in fine-grained products.With the increase of gangue particle size,the distribution rate of each component increases firstly,then decreases,and the relationship between enrichment ratio and the change of particle size conforms to the function of“y=a+b×c^(x)”.