钻屑作为一种固废,其主要处理方式为水泥固化,但加工水泥易产生大量二氧化碳,不利于环境保护。基于上述问题,提出了一种改良后微生物-氧化镁协同固化钻屑新方法。通过强度测试,研究了高炉矿渣和粉煤灰对微生物-氧化镁协同固化钻屑的改良,获得了钻屑固化体强度随高炉矿渣掺量增加而升高,随粉煤灰掺量增加而逐渐降低的规律,最高强度为5.4 MPa。采用FTIR、XRD和SEM等测试手段,对固化体中产物类型和结构进行了分析,结果表明：产物由连续的水菱镁石（矿化产物）、云雾状水化硅酸镁和层状水滑石（水化产物）组成。钻屑颗粒由矿化产物和少量水化产物固化,揭示了矿渣和粉煤灰在微生物-氧化镁协同固化钻屑的作用机理。
Abstract
Drill cuttings, as a type of solid waste, were mainly treated through cement solidification. However, a large amount of carbon dioxide was easily generated by processing cement, which was not conducive to environmental protection. Based on the above issues, a new method of microorganism magnesium oxide synergistic solidification of drilling cuttings is proposed in this paper. Through strength testing, the improvement of drill cuttings solidification by the synergy of microorganism and magnesium oxide in the presence of blast furnace slag and fly ash was studied. The strength of oil-based drill cuttings solidification was increased with the increase of blast furnace slag concentration and gradually decreased with the increase of fly ash concentration. A maximum strength of 5.4 MPa was obtained. The types and structures of the products in the solidified were analyzed through FTIR, XRD and SEM. The results showed that the products were composed of continuous brucite （mineralized product）, cloud-like hydrated magnesium silicate, and layered hydrotalcite （hydrated product）. Drill cuttings were solidified by the mineralized product and a small amount of hydrated product, revealing the mechanism of drilling cuttings being solidified by the synergy of microorganism and magnesium oxide in the presence of slag and fly ash.
关键词
钻屑 /
粉煤灰 /
矿渣 /
生物矿化 /
活性氧化镁
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Key words
drill cuttings /
fly ash /
slag /
bio-mineralization /
magnesium oxide
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