阜山金矿进回风巷粉尘孔粒径分布及其分形特征

为探究金属矿井下粉尘孔粒径特征,以阜山金矿为例,系统研究其进风巷粉尘(IAD)、回风巷粉尘(RAD)的孔粒径分布(PSD)情况.首先,利用激光粒度分析仪与扫描电子显微镜(SEM)、低温液氮吸附仪分别测试粉尘粒径与孔参数,然后利用分形理论计算并分析其粒度分形维数与孔分形维数.结果 表明:RAD粒径比IAD粒径小,两者最可...

PSD,pore structure,and fractal characteristics of intake and return airway dust in Fushan gold mine

In order to study particle size and pore characteristics of dust in underground metal mines,with Fushan gold mine as an example,PSD and pore characteristics of its IAD and RAD were systematically investigated.Firstly,PSD of dust samples were measured by using laser particle size analyzer and scanning electron microscope(SEM),meanwhile,pore parameters were measured by low-pressure N₂ gas adsorption device.Then,fractal dimensions of particle size and pore volume were calculated according fractal theory,respectively.The results show that the particle size of RAD is less than that of IAD.Their most probable particle size are 7.19 and 23.58μm,respectively,and the respirable dust percentage in them are 65%and 40%,respectively.However,the fine particles(particle size less than 1μm)percentage in IAD(0.67%)is larger than that in RAD(0.39%).In addition,pore types in RAD and IAD are similar and mainly consist by impermeable closed pore,while RAD pore is more developed than IAD pore,which was caused by the blasting action in gold mines.Furthermore,both IAD and RAD feature significant fractal characteristics,and fractal dimensions of IAD,including particle size and pore volume,are larger than that of RAD,which indicates that PSD,surface roughness and pore complexity of IAD are all more complicated than that of RAD.Therefore,gold mines should pay more attention to IAD.