基于超临界CO2射流破岩的地下硬岩矿山非爆连续开采模式研究与展望

    Research and prospect of non-explosive continuous mining mode of underground hard rock mine based on supercritical CO2 jet rock breaking

    • 摘要: 非爆破岩连续开采是未来实现地下硬岩矿山开采安全、绿色、高效的重要手段和途径,本文总结了当前非爆破岩连续开采的研究现状,针对地下硬岩矿山主要有机械破岩和液态CO2爆破破岩。与液态CO2爆破破岩不同,本文提出了基于超临界CO2射流破岩的非爆连续开采模式,利用超临界CO2极佳的流动性和渗透性,在超高压条件下,入射到岩层中直接致裂破坏岩层,再利用超临界CO2气化体积迅速膨胀,进一步扩大岩层致裂效果。理论上,这种破岩方式安全可控、绿色环保,且尚未运用在矿山开采领域,具有较高的创新性,但对超临界射流设备的研制要求较高。基于此,研究设计了超临界CO2射流破岩设备及装配喷嘴的钻头,提出了适用不同开采条件下三种超临界CO2射流硬岩破岩的连续开采工艺模式,并提出了未来亟待研究解决的问题并展望。

       

      Abstract: Non-explosive rock continuous mining is an important means and approach to achieve safe, green, and efficient underground hard rock mining in the future. This paper summarizes the current research status of non-explosive rock continuous mining, and mainly focuses on mechanical rock breaking and liquid CO2 blasting rock breaking for underground hard rock mines. Unlike liquid CO2 blasting for rock breaking, this paper proposes a non-explosive continuous mining mode based on supercritical CO2 jet rock breaking. Utilizing the excellent fluidity and permeability of supercritical CO2, under ultra-high pressure conditions, it directly fractures and destroys the rock layer when it is incident on it. Then, the gasification volume of supercritical CO2 rapidly expands, further expanding the fracturing effect of the rock layer. In theory, this rock breaking method is safe, controllable, environmentally friendly, and has not yet been applied in the field of mining. It has high innovation, but it requires high development of supercritical jet equipment. Based on this research, a supercritical CO2 jet rock breaking equipment and a drill bit equipped with nozzles are designed. Three continuous mining process modes for supercritical CO2 jet hard rock breaking under different mining conditions are proposed, and future problems that urgently need to be studied and solved are identified and discussed.

       

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