2022, The world's first steel slag capture cement kiln flue gas CO2 production line for carbon sequestration auxiliary cementitious materials and low-carbon cement has been completed and put into operation in Jiyuan Zhonglian Cement Co., Ltd., Henan Province.
" This technology mainly solves the problem of resource utilization of steel slag.". "Professor Mo Liwu of Nanjing University of Technology pointed out.".
For a long time, the resource utilization of steel slag is facing enormous challenges. Steel slag contains free calcium oxide, free magnesium oxide and other harmful substances, which greatly affects the stability of steel slag, resulting in the use of steel slag in building materials has certain security risks.
In this context, the technology of capturing CO2 from cement kiln flue gas by steel slag to prepare auxiliary cementitious materials for carbon sequestration emerges as the times require. Molliwu said that by reacting with carbon dioxide in cement kiln flue gas, harmful substances such as free CaO in steel slag will be converted into calcium carbonate, which not only plays a role in carbon sequestration, but also improves the stability of steel slag.
In addition, active substances such as nano calcium carbonate, amorphous silicon dioxide and the like generated in the reaction process can improve the hydration and gelation performance of the steel slag to a certain extent. The reacted steel slag can be used as an admixture to replace part of clinker to prepare low-carbon cement, and can also be deeply processed into an auxiliary cementitious material to be used as an admixture to prepare low-carbon concrete.
Molliwu said that compared with traditional carbon capture methods, the technology of steel slag capturing CO2 from cement kiln flue gas to prepare carbon sequestration auxiliary cementitious materials has many advantages, and it is one of the most economical, safe and efficient carbon sequestration methods.
From the point of view of carbon capture, compared with the adsorption-desorption-storage carbon capture method which has been studied more at present, the biggest advantage of this technology is that it can be used immediately after capture, and there is no need to find another way to use carbon.
From an economic point of view , the reaction product of carbon dioxide in flue gas and steel slag can be directly used in cement or concrete production, which further reduces the cost of carbon capture and creates real benefits for enterprises; At the same time, the steel slag is utilized as a resource, thus achieving the goal of "killing two birds with one stone".
" This technology solves the problem of how to apply steel slag safely, efficiently and on a large scale in building materials, and strongly promotes the low-carbon development process of cement concrete materials." Mo Liwu said that in order to achieve the national "3060 double carbon target", the future demand for carbon reduction will be huge, and the low-carbon development of building materials is a clear and inevitable direction. As one of the most economical, safe and efficient carbon sequestration methods, the technology of using steel slag to capture CO2 from cement kiln flue gas to prepare auxiliary cementitious materials for carbon sequestration has a very broad application prospect.
Green development is the solemn mission of the cement industry, and energy saving and carbon reduction is a subject that every cement enterprise can not bypass. On September 12-13, 2023, China Cement Network will hold the "2023 Cement'Double Carbon 'Conference and the 10th China Cement Energy Conservation and Environmental Protection Technology Exchange Conference" in Zhengzhou, Henan Province. At that time , Professor Mo Liwu of Nanjing University of Technology will focus on the theme of "Key Technologies for Preparing Carbon Fixation Auxiliary Cementitious Materials and Low Carbon Cement from Steel Slag Capturing Cement Kiln Flue Gas CO2 ". Wonderful sharing.
After the meeting, we will organize a visit to Jiyuan Zhonglian Cement Co., Ltd. "The world's first production line for carbon sequestration auxiliary cementitious materials and low-carbon cement from flue gas CO2 of steel slag capture cement kiln" . For more information, please sign up!
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