Recently, Hanson, a British cement giant, announced that it would spend 400 million pounds (about 3.67 billion yuan) to build facilities to make the Padeswood plant in Flintshire the first cement plant in the UK to use carbon capture technology.
However, such carbon capture technologies are not perfect. For example, the huge cost of 400 million pounds is like a "natural moat" in front of many cement enterprises, and the high construction cost is prohibitive. Doug Parr, policy director of Greenpeace UK, also said: "As far as we know, carbon capture and storage technologies used worldwide are expensive and difficult to work."
It is understood that the traditional carbon capture and storage technology costs about 400-600 yuan per ton of carbon dioxide, and the end products are often high-purity carbon dioxide gas or dry ice, with small application scale; Relevant people said that such carbon dioxide capture consumes a lot of electricity, and it is impossible to achieve the goal of carbon emission reduction without using clean energy such as green electricity, as mentioned above, " high cost and difficult to play a role ".
So is there an economical and practical option for carbon capture with low cost, wide application of end products and low energy consumption? In November
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. The main principle of this
project is that under the action of catalyst, steel slag and cement kiln flue gas CO2 react rapidly to form stable carbonate solid and amorphous SiO2 . Olves the problem of poor stability of the steel slag, improves the activity of the steel slag, and realizes the aim of partially replacing the cement clinker. After the project is put into production, 16000 tons of carbon dioxide can be directly captured annually, 300000 tons of auxiliary cementitious materials for carbon sequestration can be produced by utilizing steel slag as a resource, and 600000 tons of high-efficiency composite admixtures can be produced. The energy consumption of the
project is low, and the cost of carbon dioxide capture per ton is only about 30 yuan, which is far lower than conventional carbon capture and utilization technology (400-600 yuan/ton); And the prepared high-activity carbon fixation auxiliary cementing material is used as an admixture to further improve the carbon reduction amount. After the above process, the price of steel slag of 10-20
yuan/ton has increased by 10 times , and it has become slag composite powder of nearly 200 yuan/ton. The emission of carbon dioxide is greatly reduced, and both economic and environmental benefits are achieved.
With the strategic goal of "double carbon" put forward, China has entered a critical period of focusing on carbon reduction, promoting the synergy of pollution reduction and carbon reduction, and promoting the overall green transformation of the economy and society. Steel slag capture cement kiln flue gas CO2 to prepare carbon sequestration auxiliary cementitious materials and low-carbon cement production line undoubtedly provides a practical sample for the green development of China's building materials industry, especially for the cement industry to achieve carbon peak carbon neutralization. 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. Experts and scholars at the meeting will make brilliant sharing on the theme of "Research on Key Technologies of Carbon Sequestration of Steel Slag and Preparation of Low Carbon Building Materials" .
At the same time, the medal ceremony of "2023 Advanced Enterprises of Double Carbon in Cement Industry" and the "Double Carbon" Equipment Exhibition will be held . After the meeting, we will also organize a visit to Jiyuan Zhonglian Cement Co., Ltd. "The world's first production line of carbon sequestration auxiliary cementitious materials and low-carbon cement from flue gas CO2 of steel slag capture cement kiln" .
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