| 摘要 |
PURPOSE:To improve the whiteness of the carbonate salt by mixing a Ca(OH)2 aqueous suspension with an Mg(OH)2 aqueous suspension in a specific weight ratio and supplying a CO2-containing gas to the mixture so as to give a constant dielectric constant in a prescribed concentration and at a prescribed temperature. CONSTITUTION:A Ca(OH)2 aqueous suspension and an Mg(OH)2 aqueous suspension both having viscosities of >=1500cp, respectively, in a concentration of 400g/l at a 25 deg.C are mixed with each other in a weight ratio of 95/5 to 50/50 and in a concentration of 100-250g/l converted into Ca(OH)2. Subsequently, the mixture is heated to a liquid temperature of >=30 deg.C and subsequently mixed with a CO2-containing gas having a CO2 concentration of 15-100vol.% at a rate of 1-31/min converted into CO2 per kg of the Ca(OH). to give a pH of <=11. The CO2-containing gas is added to the mixture at a rate of 51/min converted into CO2 per kg of the Mg(OH)2 to give a constant dielectric constant at pH of <=8 thereby providing a homogenous dispersion-like carbonate salt which comprises aragonite column-like CaCO3 having a length of 0.5-3mum and a diameter of 0.1-0.3mum and a plate-like basic MgCO3 having a particle diameter of 0.5-0.7mum and which has a specific surface area. |
