Study on the impact of using decarbonized gasification slag for CO2 mineralization and storage to prepare calcium carbonate

被引：0
|
作者：
Li, Xiangyu [1 ,2 ]
Li, Xu [1 ,2 ]
Fan, Panpan [1 ,2 ]
Bao, Weiren [1 ,2 ]
Chang, Liping [1 ,2 ]
Wang, Jiancheng [1 ,3 ]
机构：
[1] State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan,030024, China
[2] College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan,030024, China
[3] College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan,030024, China
来源：
Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | 2024年 / 52卷 / 08期
关键词：
The gasification slag after carbon separation is difficult to realize effective utilization because of its high content of water and the presence of a small amount of residual carbon. To address these problems; a mineralization based on indirect carbonation to sequester CO2 and recycle calcium extraction to prepare nano-calcium carbonate process is proposed. The gasification slag after carbon separation mainly consists of CaO; Al2O3; Fe2O3; MgO; as well as some non-metallic components such as SiO2. Most of the metal components exist in amorphous form. After preliminary screening of acidic leaching agents; it was found that hydrochloric acid can effectively destroy the structure of gasification slag and dissolve the metal components in gasification slag. In this paper; the effects of leaching agent type; concentration; reaction time; temperature and liquid-solid ratio on the leaching rate of calcium from decarbonized gasification slag were investigated in detail. The results showed that the highest calcium leaching rate of 98.79% was achieved under the leaching conditions of 2 mol/L HCl; liquid-to-solid ratio of 20 mL/g; reaction temperature of 50 ℃ and reaction time of 90 min. Meanwhile; the effects of CO2 flow; temperature and time on the carbonation efficiency and precipitated calcium carbonate (PCC) crystal structure were investigated. In the carbonation stage; the main factor affecting carbonation efficiency is CO2 flow. This is because excessive CO2 will cause carbonic acid to form in the solution and partially dissolve the precipitated CaCO3; resulting in a sharp decrease in carbonation efficiency. And the carbonation efficiency gradually increases with the increase of reaction temperature. Generally speaking; increasing the temperature is beneficial for chemical reactions. However; owing to the exothermic nature of the carbonation reaction; the positive promotion effect of high temperature on the reaction process is weakened; and the solubility of CO2 in water is reduced; resulting in a slow decrease in carbonation efficiency. The effect of reaction time on carbonation process has the same trend as the change in reaction temperature. The highest carbonation efficiency could reach 99.59% by optimizing the carbonation reaction conditions. In addition; the reaction temperature and time significantly affected the calcium carbonate crystal structure and micromorphology. The formation of calcium carbonate crystals mainly goes through three stages. In the first stage; as the reaction time prolongs; disordered amorphous calcium carbonate rapidly dehydrates to form ordered calcium carbonate crystal structure. At high supersaturation; vaterite begins to nucleate and undergoes spherical growth through nucleation at the growth front. Gradually; the solubility of amorphous calcium carbonate gradually decreases; and vaterite continues to grow into polycrystalline spheres composed of roughly equal sized crystals. In the second stage; vaterite is formed under equilibrium conditions; and its crystal size almost no longer increases; leaving part of the remaining amorphous calcium carbonate dissolution and crystallization process. In the third stage; vaterite begins to decompose and forms calcite or aragonite through dissolution-recrystallization process. Experiments result have shown that vaterite and calcite are formed at low temperatures; and aragonite is formed when heated to a certain temperature. As the reaction time increases; the particle size of calcium carbonate gradually increases. Therefore; lowering the reaction temperature and time is more favorable to the formation of vaterite type calcium carbonate. © 2024 Science Press. All rights reserved;
D O I：
10.19906/j.cnki.JFCT.2024008
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页码：1193 / 1202
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