电石渣和烟道气为原料生产碳酸钙

根据电石渣组成和烟道气成分，提出了加压碳化的工艺路线。该工艺将电石渣利用和烟道气中二氧化 碳捕集封存技术结合起来，不仅解决了电石渣和烟道气的环境问题，同时又生产了高附加值的纳米碳酸钙。考察了 工艺路线中各项工艺参数的影响，得到最佳工艺条件：煅烧温度为900 ℃、消化灰水质量比为1∶7、碳化压力为0.4 MPa、碳化气速为0.093 m/s。在此条件下，添加晶型控制剂制备出了粒径为60 nm、粒径分布窄的球形纳米碳酸钙。

Preparation of calcium carbonate from calcium carbide residue and flue gas

According to the components of calcium carbide residue and the composition of flue gas，a process route of pressurized carbonization was proposed.Utilization of calcium carbide residue and the technology of carbon dioxide capture and storage from flue gas were integrated in the process.The environmental problems from calcium carbide residue and flue gas were solved，and the high-value added nano-sized calcium carbonate was produced.The parameters of this process were investigated.The optimum technical conditions were as follows：calcination temperature was 900 ℃，lime-water mass ratio was 1∶7，carbonation pressure was 0.4 MPa，and gas velocity of flue gas was 0.093 m/s.Under these conditions，adding crystallization controlling agent，a spherical nano-sized calcium carbonate with narrow diameter distribution was prepared and the particle size was 60 nm.