抄録
In the previous study, hollow calcium carbonates were successfully synthesized by CO2 bubbling in aqueous solution of calcium chloride with the presence of ammonia at temperature about 27 0C. The precipitation was carried out by controlling the pH of starting solution that was adjusted by adding of HCl solution. Hollow calcium carbonates were precipitated when the crystal phase was mainly vaterite. The aim of the present study is to investigate the precipitation conditions of the hollow calcium carbonate using a bubble column. In a bubble column, hollow calcium carbonate could be obtained without adjust of the pH solution. The effects of organic additives on the precipitation of hollow calcium carbonate were also studied.
