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对钙芒硝矿床开采的主要目的是提取其所含的硫酸钠成分,不管采用哪种开采方法,从钙芒硝中提取硫酸钠都会涉及钙芒硝的溶解与渗透。利用高精度μCT225KVFCB显微CT试验系统和MDS-200型三轴渗透试验系统,对在孔隙压出水口敞口状态下的钙芒硝进行了溶解渗透试验的进一步研究。研究表明:在溶解渗透试验过程中,钙芒硝固体骨架由致密不渗透的结构变成了可渗透的多孔介质,其固体骨架一直保持完整;随着溶解渗透时间的不断持续,由于结构的致密程度和矿物成分不断的发生变化,致使其力学性质和有效应力也在不断的发生变化;在轴压、围压不变的情况下,试件溶解贯通所需的时间随着注水压的增大减小,渗透系数随着注水压的增大而增大,随着时间的持续而增大。
The primary purpose of mining glauberite deposits is to extract the sodium sulphate contained therein. No matter which mining method is used, the extraction of sodium sulphate from glauberite involves the dissolution and infiltration of glauber’s salt. The use of high-precision μCT225KVFCB microscopy CT system and MDS-200-type three-axis penetration test system, the pore pressure water outlet open state of glauberite dissolved penetration test further study. The results show that during the process of dissolution and permeation test, the crystal structure of glauberite becomes a permeable porous medium with a dense and impermeable structure, the solid skeleton remains intact. With the continuous dissolution and permeation time, And mineral composition changes constantly, resulting in its mechanical properties and effective stress are constantly changing; axial compression, confining pressure unchanged, the specimen dissolved through the required time as the injection pressure increases Decrease, the permeability coefficient increases with the increase of water injection pressure, and increases with time.