2017 Volume 11 Issue 9
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YIN Renpeng, CHEN Xueqing, WANG Yusong, PEI Yuansheng. Dispersion effect of polyborate and its influence on calcium carbonate precipitation[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 4993-5000. doi: 10.12030/j.cjee.201609040
Citation: YIN Renpeng, CHEN Xueqing, WANG Yusong, PEI Yuansheng. Dispersion effect of polyborate and its influence on calcium carbonate precipitation[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 4993-5000. doi: 10.12030/j.cjee.201609040
shu

Dispersion effect of polyborate and its influence on calcium carbonate precipitation

  • 1.

    School of Environment, Beijing Normal University, Beijing 100875, China

  • Received Date: 05/12/2016
    Accepted Date: 05/09/2016
    Available Online: 26/08/2017
    Fund Project:
  • Under different temperatures and boron concentrations, the effects of borax and synthesized sodium pentaborate pentahydrate (SPP) on critical super saturation ratio of CaCO3 solution were studied by static conductivity method. Crystal of CaCO3 precipitation was characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The results showed that borax and SPP had the dispersion effect. The dispersion performance increased with the increasing boron concentration. As the temperature increased from 20 to 70℃, the dispersion effects of borax and SPP were reduced. However, SPP had a better thermal tolerance ability. The further study showed that borax and SPP were able to capture Ca2+, leading to the reduction of the weight of CaCO3 precipitation. Meanwhile, the crystallinity of CaCO3 precipitation could be reduced by borax and SPP, but the morphism and composition of CaCO3 precipitation were not changed. In addition, SPP had better dispersion effect, leading to the precipitation presenting spherical or plate structure. This may be due to the special three-dimensional pore structure of[B5O6(OH)4]- anion in SPP solution could capture Ca2+ easier, which prevented precipitation grains growth. The results could provide a scientific basis for the development of efficient dispersant of polyborates.
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Dispersion effect of polyborate and its influence on calcium carbonate precipitation

  • Received Date: 05/12/2016
  • Accepted Date: 05/09/2016
  • Available Online: 26/08/2017
Fund Project:

Abstract: Under different temperatures and boron concentrations, the effects of borax and synthesized sodium pentaborate pentahydrate (SPP) on critical super saturation ratio of CaCO3 solution were studied by static conductivity method. Crystal of CaCO3 precipitation was characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The results showed that borax and SPP had the dispersion effect. The dispersion performance increased with the increasing boron concentration. As the temperature increased from 20 to 70℃, the dispersion effects of borax and SPP were reduced. However, SPP had a better thermal tolerance ability. The further study showed that borax and SPP were able to capture Ca2+, leading to the reduction of the weight of CaCO3 precipitation. Meanwhile, the crystallinity of CaCO3 precipitation could be reduced by borax and SPP, but the morphism and composition of CaCO3 precipitation were not changed. In addition, SPP had better dispersion effect, leading to the precipitation presenting spherical or plate structure. This may be due to the special three-dimensional pore structure of[B5O6(OH)4]- anion in SPP solution could capture Ca2+ easier, which prevented precipitation grains growth. The results could provide a scientific basis for the development of efficient dispersant of polyborates.

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