多硼酸盐的分散作用及其对碳酸钙沉淀的影响

发布时间：2018-05-08 00:11

本文选题：硼砂 + 五水合五硼酸钠　；参考：《环境工程学报》2017年09期

【摘要】：采用静态电导率法,研究了不同温度及硼浓度条件下,硼砂和合成的五水合五硼酸钠(SPP)对碳酸钙临界过饱和度值的影响,并利用多晶X射线衍射仪、扫描电子显微镜和能谱仪对碳酸钙沉淀进行表征。结果表明,硼砂和SPP具有分散作用,硼含量越高,分散作用越好。随着温度升高(20~70℃),硼砂和SPP的分散作用均降低,但SPP更具有耐温性。进一步研究发现,硼砂和SPP能够捕获Ca2+,导致沉淀量减少,同时能够降低碳酸钙结晶度,但是不改变碳酸钙的晶型和成分。SPP的分散作用更明显,导致沉淀中出现球状和盘状结构。这可能是由于SPP溶液中[B5O6(OH)4]-阴离子特殊的三维骨架结构更易捕获Ca2+,阻止沉淀晶粒的生成。研究结果可为高效多硼酸盐分散剂的研发提供依据。
[Abstract]:The effects of borax and synthetic sodium pentaborate sodium pentahydrate on the critical supersaturation of calcium carbonate at different temperatures and boron concentrations were studied by using static conductivity method, and polycrystalline X-ray diffractometer was used. The precipitation of calcium carbonate was characterized by scanning electron microscope and energy spectrometer. The results showed that borax and SPP were dispersed, and the higher the boron content was, the better the dispersion was. With the increase of temperature, the dispersion of borax and SPP decreased, but SPP was more resistant to temperature. It was further found that borax and SPP could capture Ca2, resulting in a decrease in precipitation amount and a decrease in the crystallinity of calcium carbonate, but without changing the crystal form of calcium carbonate and the dispersion of composition. The formation of spherical and discoid structures in the precipitate. This may be due to the special three-dimensional skeleton structure of [B5O6(OH)4]-anion in SPP solution, which is easier to capture Ca2 and prevent the formation of precipitated grains. The results can provide basis for the research and development of high-efficiency polyborate dispersant.
【作者单位】：北京师范大学环境学院;
【基金】：国家自然科学基金资助项目(51579009)
【分类号】：TQ128.5

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