Kinetics of Calcium Carbonate (CaCO3) Precipitation from a Icel-Yavca Dolomite Leach Solution by a Gas (Carbon Dioxide)/Liquid Reaction


YILDIRIM M. , Akarsu H.

HELVETICA CHIMICA ACTA, cilt.92, ss.502-513, 2009 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 92 Konu: 3
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1002/hlca.200800303
  • Dergi Adı: HELVETICA CHIMICA ACTA
  • Sayfa Sayısı: ss.502-513

Özet

The effects of time, CO2-gas-injection pressure, and bulk temperature on the precipitation of Ca2+ ions as a precipitated calcium carbonate (PCC) from a dolomite leach solution were investigated. Precipitation periods from 1 to 7 min were examined, and experiments were run at CO2-injection pressures of 200-800 kPa. Effects of bulk temperature were studied in the range from 40 to 70 degrees, and precipitation rates of PCC were determined by measuring the Ca2+ concentrations in the initial and effluent solutions. Influences of these parameters on the subsequent incorporation of Mg2+ ions with the precipitate are discussed in detail. Kinetic analysis of the precipitation was performed by considering the rates as a function of CO32--ion concentrations. Results obtained by this process clearly show that Ca2+ ions in the solution can successfully be precipitated as a calcium carbonate product containing 54.70% of CaO and 0.77% MgO, at the rate of 2.01 mM h(-1).

The effects of time, CO2-gas-injection pressure, and bulk temperature on the precipitation of Ca2+ ions as a precipitated calcium carbonate (PCC) from a dolomite leach solution were investigated. Precipitation periods from 1 to 7 min were examined, and experiments were run at CO2-injection pressures of 200 – 800 kPa. Effects of bulk temperature were studied in the range from 40 to 708, and recipitation rates of PCC were determined by measuring the Ca2ş concentrations in the initial and effluent solutions. Influences of these parameters on the subsequent incorporation of Mg2ş ions with the nprecipitate are discussed in detail. Kinetic analysis of the precipitation was performed by considering the rates as a function of CO2_ 3 -ion concentrations. Results obtained by this process clearly show that Ca2 ions in the solution can successfully be precipitated as a calcium carbonate product containing 54.70% of CaO and 0.77% MgO, at the rate of 2.01 mm h_