| 摘要 |
PURPOSE:To freely change the pore diameter or crystal form of the title adsorbent and to increase the capacity to adsorb heavy metals by using a synthetic calcium carbonate compact or a synthetic calcium carbonate pellet as the porous body to form the adsorbent. CONSTITUTION:A gas contg. gaseous carbon dioxide is introduced into a 1-15% suspension of calcium hydroxide in water to 90-100% carbonation, and the slurry is filtered and then pressure-formed or granulated. The carbonation of the product is completed in a gas contg. gaseous carbon dioxide, and the porous adsorbent of synthetic calcium carbonate is obtained. The pore diameter of the porous body can be changed by controlling the particle diameter of the synthetic calcium carbonate, pressure forming conditions, or granulating conditions. Since the porous adsorbent adsorbs heavy metals sufficiently, the adsorbent is appropriately used in waste water treatment and is capable of contributing to the solution of the environmental pollution problems.
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