| 微生物诱导碳酸镁沉淀固化钻屑试验研究 |
| 投稿时间：2024-03-03 修订日期：2024-04-08 点此下载全文 |
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| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要:钻屑是钻井工程中产生的固废,通常采用水泥对其进行固化处理。然而,水泥的生产将产生大量的二氧化碳,不利于环境保护。针对上述问题,本文提出了微生物诱导碳酸镁沉淀固化钻屑新方法。微生物诱导碳酸镁沉淀固化钻屑力学性能研究表明,固化体强度随含水量、尿素浓度增加呈下降趋势,随活性氧化镁浓度、养护时间增加呈上升趋势,最大强度为2.5 MPa。FTIR、XRD和SEM等表征结果发现,微生物诱导碳酸镁沉淀产物为玫瑰花状水菱镁石(4MgCO3.Mg(OH)2.4H2O)和针状水碳镁石(MgCO3.3H2O)；产物以致密的碳酸盐网络状结构将松散的颗粒胶结成结构完整的固化体,从而揭示了微生物诱导碳酸镁沉淀固化钻屑作用机制。 |
| 中文关键词:微生物 氧化镁 固化 钻屑 |
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| Experimental study on drill cuttings consolidated by microbial induced magnesium carbonate precipitation |
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| Abstract:Drill cuttings are solid waste produced in drill engineering. They are usually solidified with hydration of cement. However, a large amount of carbon dioxide was generated by cement production, which is not conducive to environmental protection. According to above problems, a new method of drill cuttings consolidated by microbial induced magnesium carbonate precipitation was proposed for the first time. The mechanical properties of drilling cuttings solidified via microbial induced magnesium carbonate precipitation demonstrated that the strength of solidified body was decreased by increasing water content and urea concentration, and increased with increasing reactive magnesium oxide concentration and curing time. Meanwhile, the most strength of solidified body was found with 2.5 MPa. The results of FTIR, XRD and SEM indicated that rosette Hydromagnesite (4MgCO3.Mg(OH)2.4H2O) and acicular Nesquehonite (MgCO3.3H2O) were yielded via synergy of microorganism-magnesium oxide. The loose particles were solidified into well-structured solidified body by dense carbonate network, consequently revealing the mechanism of drill cuttings consolidated by microbial induced magnesium carbonate precipitation. |
| keywords:Microorganism Magnesium Oxide Solidification Drill cuttings |
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