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利用扫描电子显微镜(SEM)和X-射线衍射(XRD)技术对加入Mg2+后生成的CaCO3形貌和晶型进行了表征,探讨了Mg2+对CaCO3结晶过程和晶型的影响。结果表明,加入Mg2+后生成的CaCO3晶型主要为文石和方解石,且文石的含量高于方解石。随着加入Mg2+浓度的增加,文石含量逐渐增加,文石的针状晶须趋于细化。当Mg2+浓度高于0.50 mmol.L-1时对方解石有很强的抑制作用,溶液中Mg2+的存在有利于CaCO3晶型由方解石向文石转化。
The morphologies and crystal forms of CaCO3 were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The effects of Mg2 + on the crystallization process and the crystalline form of CaCO3 were discussed. The results show that the CaCO3 crystal forms mainly include aragonite and calcite after adding Mg2 +, and the content of aragonite is higher than that of calcite. With the increase of Mg2 + concentration, the content of aragonite gradually increases, and acicular whiskers of aragonite tend to be refined. When Mg2 + concentration is higher than 0.50 mmol.L-1, the calcite has a strong inhibitory effect. The existence of Mg2 + in solution is in favor of CaCO3 crystal transformation from calcite to aragonite.