...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Crystal growth & design >Effect of pH and Phosphate on Calcium Carbonate Polymorphs Precipitated at near-Freezing Temperature
【24h】

Effect of pH and Phosphate on Calcium Carbonate Polymorphs Precipitated at near-Freezing Temperature

机译：pH和磷酸盐对近冻结温度下碳酸钙多晶型物析出的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effects of pH and phosphate on the precipitation of calcium carbonate polymorphs from aqueous solution were investigated. Experiments were carried out at near-freezing temperature and two different pH conditions (pH 13.4 and 9.0). At each pH condition, solutions having different concentrations of CaCl2 and NaHCO3 were mixed to achieve Ca/CO3 ratios of 1:1 and 10:1 at different pumping rates with and without phosphate. Results showed that, at pH 13.4, only ikaite was formed, independent of pumping rate, Ca/CO3 ratio, and phosphate. At pH 9.0, the precipitate was predominantly vaterite in the absence of phosphate and ikaite in the presence of phosphate regardless of the ratio of Ca/CO3. These results indicate that at low temperatures and moderate alkaline conditions (pH 9.0), phosphate can act as a switch between ikaite and vaterite polymorphs. Contrastingly, at higher alkaline conditions (pH 13.4) phosphate is not prerequisite and the high pH in itself is enough to trigger ikaite formation over vaterite.
机译：研究了pH和磷酸盐对水溶液中碳酸钙多晶型物沉淀的影响。实验是在接近冰点的温度和两个不同的pH条件（pH 13.4和9.0）下进行的。在每种pH条件下，将具有不同浓度的CaCl2和NaHCO3的溶液混合，以在有和无磷酸盐的情况下，以不同的泵送速率实现Ca / CO3比为1：1和10：1。结果表明，在pH 13.4时，仅形成ikaite，与泵送速率，Ca / CO3比和磷酸盐无关。在pH 9.0时，无论Ca / CO3的比例如何，在没有磷酸盐的情况下沉淀物主要是球v石，在有磷酸盐的情况下沉淀物是钾长石。这些结果表明，在低温和中等碱性条件下（pH 9.0），磷酸盐可以作为钾盐和球ate石多晶型物之间的转换。相反，在较高的碱性条件下（pH 13.4）并不是磷酸盐的先决条件，而高pH值本身足以触发球v石上形成斑石。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号