• synthesis of pure aragonite by sonochemical mineral carbonation

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 887
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the objective of this work was to promote the formation of the aragonite polymorph of calcium carbonate, which has some valuable applications in industry, via the mineral carbonation route. the combination of ultrasound with magnesium ions promoted the formation of pure aragonite crystals at optimum conditions. it was possible to synthesize high purity aragonite precipitates at temperatures ranging from 24 °c to 70 °c, with the resulting powders possessing varying particle size distributions (from sub-micron up to 20 μm) and crystal morphologies (from acicular needles to novel hubbard squash-like particles). several process parameters were found to influence the produced calcium carbonate polymorph ratios (aragonite over calcite). higher values of magnesium-to-calcium ratio, intermediate ultrasound amplitude (60%), continuous ultrasound application (100% cycle), introduction of ultrasound pre-breakage, lowering of the co2 flow rate, and increase in the relative concentration (g/l ca(oh)2), all promoted aragonite formation. a potential route for industrial production of this material has been identified via a fed-batch process, which effectively reutilizes magnesium chloride while maintaining high aragonite yield. the results presented herein are significantly superior to aragonite formation using only single promoting techniques, typically found in literature, and go beyond by focusing on pure (>99%) aragonite formation.

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