Nitrogen and denitrification in the cement industry is under pressure

In recent days, the Ministry of Environmental Protection awarded 14 China Cement Labeling Products with Low Carbon Cement Product Demonstration Certificates to 14 leading cement manufacturers. These companies have not only shown commitment to environmental protection but also set a strong example in reducing energy consumption and cutting carbon dioxide emissions. The new environmental labeling standards also emphasize mine restoration, requiring that all cement plants achieve a 100% mine reclamation rate after completion. This is a significant step toward sustainable development in the industry. Controlling carbon dioxide emissions from the cement sector is crucial for meeting national targets on greenhouse gas reduction. If all certified low-carbon cement products are fully implemented, it is estimated that at least 20.7 million tons of CO₂ could be cut annually, based on a 30% penetration rate of these environmentally friendly products. This highlights the potential impact of green certification on the broader climate agenda. Similarly, managing nitrogen oxide (NOₓ) emissions from cement production plays a vital role in achieving national air quality goals. During a press conference held on World Environment Day this year, Wu Xiaoqing, Deputy Minister of the Ministry of Environmental Protection, noted that China’s NOₓ emissions reached 24.043 million tons in 2011—a 5.73% increase compared to 2010. While overall emissions did not decline, the cement industry has emerged as the second-largest source of NOₓ emissions, following thermal power plants. Effectively controlling these emissions could significantly reduce the country's total pollution levels. To address this issue, demonstration lines for denitrification have been established across several provinces, including Hebei, Shaanxi, Ningxia, Sichuan, Chongqing, Guizhou, Hunan, Guangxi, Zhejiang, Anhui, and Fujian. These projects showcase the effectiveness of technological upgrades in lowering NOₓ emissions. For instance, the 6000t/d production line at Fujian Longlin achieved a denitrification efficiency of 65%, with emission concentrations dropping to 185mg/Nm³. At Guangxi Sepangnan, the 2000t/d line saw NOₓ levels fall from 1200–1650mg/Nm³ to 200–350mg/Nm³ after renovation. In Xianyang, Shaanxi, the 2500t/d line maintained emissions below 400mg/Nm³, while the 2500t/d line at Ningxia Pinglu Hengda achieved a 50–60% denitrification rate. Meanwhile, Conch’s lines in Chongqing and Wuhu reduced NOₓ by 35% and 30%, respectively. These demonstration projects highlight the feasibility and effectiveness of denitrification technologies. Once widely adopted across the cement industry, such measures could lead to substantial improvements in air quality and environmental protection. With continued investment and policy support, the cement sector can play a pivotal role in China’s broader sustainability efforts.

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