陕西洛南县北部冶金级白云岩分布规律及物性特征

Distribution and physical characteristics of metallurgical grade dolomite in northern Luonan County,Shaanxi Province

洛南县北部区域广泛出露的蓟县系龙家园组第四岩性段(Jxl^4)为冶金级白云岩矿体主要赋存层位。为大致了解该区域冶金用白云岩分布规律、资源量概况及物理性质特征等,通过路线调查、槽探工程及刻槽采样化验测试等工作,基本查明了该矿体为层控与含矿地层分布一致,局部受岩浆及构造影响;采取3组样品进行热强度和抗爆裂性检测显示其耐磨指数、灰分、磨损重量比和细粉重量比均处于较低水平,且都具有较好的抗爆裂性。为该矿床下一步的勘查、开采利用提供了重要的地质依据。

The fourth lithologic section(Jxl^4)of Longjiayuan formation,Jixian System,which is widely exposed in the northern area of luonan county,is the main occurrence of metallurgical dolomite orebody.In order to get a general understanding of the distribution rules,resources and physical properties of the metallurgical dolomite in this area,Through geological route survey,trench exploration engineering,groove sampling and laboratory testing,it was roughly ascertained that the ore body is controlled in layers and has the same distribution as the ore-bearing strata,and is locally affected by magma and structure.Three groups of samples were tested for thermal strength and anti-bursting property.The results showed that the abrasion resistance index,ash content,wear weight ratio and fine powder weight ratio were all at a low level and had good anti-bursting property.It provides an important geological basis for the next exploration,exploitation and utilization of the orebody.