Synthesis of calcium carbonate by semicontinuous carbonation method in the presence of dextrans

Abstract

Precipitated calcium carbonate (PCC) was prepared by means of semicontinuous carbonation of Ca(OH)2 suspension, at 35 and 45 °C and in the presence of non-ionic dextran and dextran sulfate. The car-bonation process was regulated at different predetermined values of electrical conductivity, that corresponded to different concentrations of dissolved Ca(OH)2: 0.5 mS cm)-1 < ?25