空气反循环跟管连续取样技术在排土场低品位矿产勘探中的应用

Application of air reverse circulation casing-following continuous sampling technology in low-grade mineral exploration of waste dumps

摘要:

本文系统探讨了空气反循环跟管连续取样技术在排土场低品位矿产勘探中的应用价值与技术路径。该技术融合空气潜孔锤破岩、套管跟进护壁与反循环取样等工艺，适用于复杂松散地层，具备高效、精准、环保等优势。结合新疆金宝排土场低品位磁铁矿勘探项目，从设备选型、钻进参数、工艺措施等方面展开分析。结果表明，该技术显著提升了钻进效率与取样代表性，平均机械钻速达24.28 m/h，岩粉采取率整体高于60%，为排土场资源勘查提供了可靠的技术支撑，具有推广价值。

Abstract:

This paper systematically discusses the application value and technical route of air reverse circulation casing-following continuous sampling technology in low-grade mineral exploration of waste dumps. This technology integrated the techniques of air down-the-hole（DTH） hammer rock breaking， casing-following for wall protection， and reverse circulation sampling， and is suitable for complex unconsolidated strata with the advantages of high efficiency， precision， and environmental sustainability. Through the low-grade magnetite exploration project in the Xinjiang Jinbao waste dumps， the equipment selection， drilling parameters， and operational measures are analyzed in this research. The results indicated that this technology significantly enhances drilling efficiency and sampling representativeness， achieving an average mechanical efficiency of 24.28 m/h and an overall rock powder recovery rate of over 60%， which provides reliable technical support for resource exploration at waste dumps and holds significant potential for broader application.