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Carbonate binders by “cold sintering” of calcium carbonate

机译：通过“冷烧结”碳酸钙制成的碳酸盐粘合剂

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The solubility of calcium carbonate (limestone) particles depends on the amount of CO2 dissolved in the water, which is a function of temperature and the pressure of CO2 that is in equilibrium with water. At a constant temperature, increasing CO2 pressure increases the solubility of CaCO3, and decreasing CO2 pressure favours the crystallisation of CaCO3. This dissolution–crystallisation behaviour of CaCO3 can be used in the development of carbonate binders—a process called “cold sintering”—of limestone. This paper examines the effect of a range of parameters on the cold sintering process of limestone powder. The parameters studied are CO2 gas pressure (atmospheric, 10 atm and 35 atm), exposure time (0–90 min), post-compaction pressure (10 and 15 MPa) and compact pressing time (10–60 min). The water/limestone powder ratio was kept constant at 0.2 (by weight). The compressive strength of the limestone compacts was used as a measure of the efficiency of the carbonate binder formation process, and scanning electron microscopy was used to study the microstructural developments. The results show that carbonate binders can be produced by cold sintering of limestone powder. Exposure of limestone compacts to high CO2 pressure followed by post-compaction at high mechanical pressure, enhances the strength of the compact. From the microstructural data, it is evident that newly formed calcium carbonate crystal growths are responsible for the strength improvements observed. The amount of water that is used in the limestone powder mixture is one factor that controls the quantity of the cementing phase. Future work has to be focussed on the application of methods to further increase the solubility of calcium carbonate, as the amount of calcium carbonate available for recrystallisation is important in producing a strong binder.
机译：碳酸钙（石灰石）颗粒的溶解度取决于水中溶解的CO2 的量，这是温度和与水平衡的CO2 压力的函数。在恒定温度下，增加CO2 的压力会增加CaCO3 的溶解度，而降低CO2 的压力则会促进CaCO3 的结晶。 CaCO3 的这种溶解-结晶行为可用于开发石灰石的碳酸盐粘合剂（一种称为“冷烧结”的过程）。本文研究了一系列参数对石灰石粉冷烧结过程的影响。研究的参数是CO2气体压力（大气压，10个大气压和35个大气压），暴露时间（0–90分钟），压实后压力（10和15 MPa）和压制时间（10–60分钟） 。水/石灰石粉末的比例保持恒定在0.2（重量）。石灰石压块的抗压强度被用来衡量碳酸盐粘合剂形成过程的效率，而扫描电子显微镜则被用来研究微结构的发展。结果表明，通过石灰石粉的冷烧结可以生产碳酸盐粘合剂。将石灰石压块暴露于高CO2 压力下，然后在高机械压力下进行后压实，可增强压块的强度。从微观结构数据来看，很明显新形成的碳酸钙晶体生长是所观察到的强度提高的原因。石灰石粉末混合物中使用的水量是控制固井相量的一个因素。未来的工作必须集中在方法的应用上，以进一步增加碳酸钙的溶解度，因为可用于重结晶的碳酸钙的量在生产强力粘合剂中很重要。

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  • 来源
    《Journal of Materials Science》 |2007年第16期|6792-6797|共6页
  • 作者

    Premalatha De Silva; Liana Bucea; Vute Sirivivatnanon; David R. Moorehead;

  • 作者单位

    CSIRO Manufacturing ampamp Infrastructure Technology 14 Julius Avenue Riverside Corporate Park North Ryde Sydney NSW 2113 Australia;

    CSIRO Manufacturing ampamp Infrastructure Technology 14 Julius Avenue Riverside Corporate Park North Ryde Sydney NSW 2113 Australia;

    CSIRO Manufacturing ampamp Infrastructure Technology 14 Julius Avenue Riverside Corporate Park North Ryde Sydney NSW 2113 Australia;

    Arup Level 10 201 Kent Street North Ryde Sydney NSW 2000 Australia;

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