Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre
In order to study the weakening mechanism and mechanical behaviors of hard lamprophyre of Carboniferous Permian coal-bearing strata in China’s mining area, lamprophyre samples were subjected to static rock dissolution experiments with pH values of 0, 2, and 4. The acid corrosion mechanism of lamprop...
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MDPI AG
2022-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/19/6634 |
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| author | Jun Guo Xincheng Mi Guorui Feng Tingye Qi Jinwen Bai Xiaoze Wen Ruipeng Qian Linjun Zhu Xingchen Guo Luyang Yu |
| author_facet | Jun Guo Xincheng Mi Guorui Feng Tingye Qi Jinwen Bai Xiaoze Wen Ruipeng Qian Linjun Zhu Xingchen Guo Luyang Yu |
| author_sort | Jun Guo |
| collection | DOAJ |
| description | In order to study the weakening mechanism and mechanical behaviors of hard lamprophyre of Carboniferous Permian coal-bearing strata in China’s mining area, lamprophyre samples were subjected to static rock dissolution experiments with pH values of 0, 2, and 4. The acid corrosion mechanism of lamprophyre was revealed from the weight changes of samples, characteristics of solution ion concentration, and macro-mechanical properties. The experimental results show that reaction occurred between lamprophyre and acid solution. With the increasing concentration of H<sup>+</sup>, the reaction was more intense, the degree of acid etching was higher, and the weight loss was greater. The internal damage induced by acid etching results in the slow extension of the compaction stage of stress–strain curve of uniaxial compression, and the obvious deterioration of mechanical properties of the lamprophyre. The uniaxial compressive strength of the lamprophyre in the dry state is 132 MPa, which decreased to 39 MPa under the acid etching condition, showing significant mudding characteristics. Dolomite (CaMg(CO<sub>3</sub>)<sub>2</sub> with 19.63%) and orthoclase (KAlSi<sub>3</sub>O<sub>8</sub> with 31.4%) in lamprophyre are the major minerals constituents involved in acidification reaction. Photomicrograph recorded from SEM studies reveals that the dissolution effect was directly related to the concentration of H<sup>+</sup> in the solution. The dissolution effect was from the surface to the inside. The small dissolution pores became larger and continuously expanded, then finally formed a skeleton structure dominated by quartz. The content of K<sup>+</sup>, Ca<sup>2+</sup>, and Mg<sup>2+</sup> in the solution after acid etching reaction indicates that the acidified product of orthoclase is colloidal H<sub>2</sub>SiO<sub>3</sub>, which adhered to the surface of samples during acid etching and hinders the further acidification of minerals. The dissolution of dolomite and orthoclase under acidic conditions directly leads to the damage of their structure and further promotes the water–rock interaction, which is the fundamental reason for the weakening of the mechanical properties of lamprophyre. |
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| id | doaj.art-a061b4df72be4669ae5886fbf64d3de6 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
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| spelling | doaj.art-a061b4df72be4669ae5886fbf64d3de62023-11-23T20:54:08ZengMDPI AGMaterials1996-19442022-09-011519663410.3390/ma15196634Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion LamprophyreJun Guo0Xincheng Mi1Guorui Feng2Tingye Qi3Jinwen Bai4Xiaoze Wen5Ruipeng Qian6Linjun Zhu7Xingchen Guo8Luyang Yu9College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaIn order to study the weakening mechanism and mechanical behaviors of hard lamprophyre of Carboniferous Permian coal-bearing strata in China’s mining area, lamprophyre samples were subjected to static rock dissolution experiments with pH values of 0, 2, and 4. The acid corrosion mechanism of lamprophyre was revealed from the weight changes of samples, characteristics of solution ion concentration, and macro-mechanical properties. The experimental results show that reaction occurred between lamprophyre and acid solution. With the increasing concentration of H<sup>+</sup>, the reaction was more intense, the degree of acid etching was higher, and the weight loss was greater. The internal damage induced by acid etching results in the slow extension of the compaction stage of stress–strain curve of uniaxial compression, and the obvious deterioration of mechanical properties of the lamprophyre. The uniaxial compressive strength of the lamprophyre in the dry state is 132 MPa, which decreased to 39 MPa under the acid etching condition, showing significant mudding characteristics. Dolomite (CaMg(CO<sub>3</sub>)<sub>2</sub> with 19.63%) and orthoclase (KAlSi<sub>3</sub>O<sub>8</sub> with 31.4%) in lamprophyre are the major minerals constituents involved in acidification reaction. Photomicrograph recorded from SEM studies reveals that the dissolution effect was directly related to the concentration of H<sup>+</sup> in the solution. The dissolution effect was from the surface to the inside. The small dissolution pores became larger and continuously expanded, then finally formed a skeleton structure dominated by quartz. The content of K<sup>+</sup>, Ca<sup>2+</sup>, and Mg<sup>2+</sup> in the solution after acid etching reaction indicates that the acidified product of orthoclase is colloidal H<sub>2</sub>SiO<sub>3</sub>, which adhered to the surface of samples during acid etching and hinders the further acidification of minerals. The dissolution of dolomite and orthoclase under acidic conditions directly leads to the damage of their structure and further promotes the water–rock interaction, which is the fundamental reason for the weakening of the mechanical properties of lamprophyre.https://www.mdpi.com/1996-1944/15/19/6634acid corrosionlamprophyremechanical activation behaviorweakening mechanism |
| spellingShingle | Jun Guo Xincheng Mi Guorui Feng Tingye Qi Jinwen Bai Xiaoze Wen Ruipeng Qian Linjun Zhu Xingchen Guo Luyang Yu Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre Materials acid corrosion lamprophyre mechanical activation behavior weakening mechanism |
| title | Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre |
| title_full | Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre |
| title_fullStr | Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre |
| title_full_unstemmed | Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre |
| title_short | Study on Mechanical Properties and Weakening Mechanism of Acid Corrosion Lamprophyre |
| title_sort | study on mechanical properties and weakening mechanism of acid corrosion lamprophyre |
| topic | acid corrosion lamprophyre mechanical activation behavior weakening mechanism |
| url | https://www.mdpi.com/1996-1944/15/19/6634 |
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