Study on Preparation of Nano-sized Calcium Carbonate by Calcium Carbide Waste Residue

The nano-sized calcium carbonate is prepared by the CaCl2 liquid made by refined calcium carbide waste residue reacting with the(NH4)CO3 2 depending on the additive.The reaction influencing conditions such as materiel concentration, reaction temperature, the species of additive and their function mechanism are studied. The best way of preparing nano-sized calcium carbon- ate by calcium carbide waste residue is concluded, the temperature is 25 ℃, the concentration is 1.5 mol/L. The self-made macromolecule additive can lead to cubic calcium carbonate,the borax additive can lead to chain-like calcium carbonate,and the mellow additive can lead to needle calcium carbonate.