Study On Rock Characteristics And Drillability Of Anqian Iron Mine

The study of rock drillability is a basic topic in the field of drilling, it has important practical meaning also. Rock drillability is the main foundation of choosing drilling tools, predicting drilling velocity and administering production.Anqian mine which is in the preliminary stage of the exploitation is beside Qidashan mine. Although Anqian mine is in the opposite side of the same iron ore stratum as Qidashan mine, its wastage of the drill bits is twice as Qidashan mine's. Not only the serious attrition wear and short service life of drill bits and low drilling efficiency are the problems in the process of mining, but also the rock is very difficult to drill. In this situation, the production costs are so high that it is necessary to study the rock drillability.To contrast, this paper studied the rock property of iron props in both Anqian iron mine and Qidashan iron mine.19 polished sections and 29 thin sections were made in order to observe and describe their mineral composition, grain sizes, texture and structure, cementation mode and fine structure using a microscope. All the core samples were grinded below the 200 mesh in order to carry out X-Ray diffraction and spectrofluorimetry.On the basis of observation of fine structure, this test has checkout density, longitudinal wave velocity, bulk density, water-absorption capacity, compression strength and tensile strength of 61 core samples including 100 rock cores, also tested elastic ratio, Poisson's ratio and other parameters of 33 rock cores. With the chiseling testing in the locale of Anqian mine and Qidashan mine, the drillability of 18 kinds of rocks was classed according to the specific chiseling work (a) and the wearing drill blade width (b). Furthermore, the drillability subareas in Anqian mine were divided according to the digging plan map and the pure rock drilling speed and the drill bits consumption per meter hole were labeled. The data of rock drilling and testing is consistent to the labeled result in locale. The result verified the fact that it is reasonable and scientific to use the method of specific chiseling work to carry out the drillability classification.The rock of Anqian mine is difficult to drill and the service life of drill bits is short. In this paper, I expound the ultimate reasons. On the basis of comparison to Qidashan mine, quantitative standards and references were given. Ulteriorly, the drillability classification was cared through according to the actual production of Anqian mine. Through numerical analysis, the mathematical model of forecast drill bits life on the specific conditions that can offer technical basis for formulating scientific labor production ration and materials consumption rate was point out. It can further guide optimizing technical parameters of perforation. To sum up, this study has important practical value because it can help to improve drill bits life and management decision-making and lower perforation costs.