Simulating the typical carbonation step in a mineral CO_2 sequestration, precipitated calcium carbonate(PCC) was prepared by bubbling CO_2 gas into a rich Ca solution. These carbonation reactions were conducted at thr...Simulating the typical carbonation step in a mineral CO_2 sequestration, precipitated calcium carbonate(PCC) was prepared by bubbling CO_2 gas into a rich Ca solution. These carbonation reactions were conducted at three p H ranges, namely 10.0–9.0, 9.0–8.0, and 8.0–7.0, in which temperature and CO_2 flow rate are additional experimental variables. The PCC obtained in experiments was examined by Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD). It was found that supersaturation determined by p H value and flow rate of CO_2 has significant influence on polymorph of PCC. Vaterite was preferably formed at high supersaturation, while dissolution of metastable vaterite and crystallization of calcite occurred at low supersaturation. High temperature is a critical factor for the formation of aragonite. At 70 °C, vaterite, calcite and aragonite were observed to coexist in PCC because transformation from vaterite to aragonite via calcite occurred at this temperature. Scanning electron microscopy(SEM) technology was performed on prepared PCC, and various morphologies consistent with polymorphs were observed.展开更多
SPIE-Vol.3779 01165621999年SPIE会议录,Vol.3779:光学设计与光学工程发展近况,8=1999 proceedings of SPIE,Vol.3779:Current developments in optical design and optical engi-neering Ⅷ[会,英]/SPIE-The International Society fo...SPIE-Vol.3779 01165621999年SPIE会议录,Vol.3779:光学设计与光学工程发展近况,8=1999 proceedings of SPIE,Vol.3779:Current developments in optical design and optical engi-neering Ⅷ[会,英]/SPIE-The International Society forOptical Engineering.—1999.—448P.(EC)本会议录收集了于1999年7月19～21日在科罗拉多州Denver召开的光学设计与光学工程会议上发表的46篇论文,内容涉及空间光学,物理光学,激光束控制,新型光学系统与应用,红外衍射与透镜设计,光学系统设计,仪器设计,杂散光与散射,红外与紫外元件与系统。展开更多
基金Supported by the National Natural Science Foundation of China(41471412)
文摘Simulating the typical carbonation step in a mineral CO_2 sequestration, precipitated calcium carbonate(PCC) was prepared by bubbling CO_2 gas into a rich Ca solution. These carbonation reactions were conducted at three p H ranges, namely 10.0–9.0, 9.0–8.0, and 8.0–7.0, in which temperature and CO_2 flow rate are additional experimental variables. The PCC obtained in experiments was examined by Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD). It was found that supersaturation determined by p H value and flow rate of CO_2 has significant influence on polymorph of PCC. Vaterite was preferably formed at high supersaturation, while dissolution of metastable vaterite and crystallization of calcite occurred at low supersaturation. High temperature is a critical factor for the formation of aragonite. At 70 °C, vaterite, calcite and aragonite were observed to coexist in PCC because transformation from vaterite to aragonite via calcite occurred at this temperature. Scanning electron microscopy(SEM) technology was performed on prepared PCC, and various morphologies consistent with polymorphs were observed.
文摘SPIE-Vol.3779 01165621999年SPIE会议录,Vol.3779:光学设计与光学工程发展近况,8=1999 proceedings of SPIE,Vol.3779:Current developments in optical design and optical engi-neering Ⅷ[会,英]/SPIE-The International Society forOptical Engineering.—1999.—448P.(EC)本会议录收集了于1999年7月19～21日在科罗拉多州Denver召开的光学设计与光学工程会议上发表的46篇论文,内容涉及空间光学,物理光学,激光束控制,新型光学系统与应用,红外衍射与透镜设计,光学系统设计,仪器设计,杂散光与散射,红外与紫外元件与系统。
