【Frontiers in HaiChuan Chemical Technology】Dalian Institute of Chemical Physics’ \"Precision Denitration Technology for Metal Magnesium Smelting Industry\" Passes Scientific and Technological Achievement Evaluation

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The “Precise Denitration Technology for Metal Magnesium Smelting Industry” developed by our institute has passed the evaluation of scientific and technological achievements. Publication date: May 13, 2025 | Submitted by: Team 103. On May 12, the team led by researchers Zhang Haijun and Chen Jiping from the Environmental Ecology Evaluation and Analysis Research Group (Team 103) in our institute’s Instrumental Analysis Chemistry Laboratory, in collaboration with Yulin Zhongke Clean Energy Innovation Institute and Shaanxi Zhonghuan Carbon Energy Technology Co., Ltd., developed this technology with independent intellectual property rights; it has now passed the evaluation of scientific and technological achievements organized by the China Environmental Protection Federation. The evaluation committee is composed of 9 experts, with Researcher Chai Faha, the chief expert at the Chinese Academy of Environmental Sciences, serving as the committee chairman. Researcher Peng Yingden, the chief engineer at the Urban Environmental Pollution Control Technology Research Center, and Researcher Zhang Zhimin from the Emergency Response Center of the Ministry of Ecology and Environment serve as the vice chairmen. After thorough evaluation, the review committee unanimously agreed that this technological achievement is at the leading level in China’s magnesium smelting industry, while its integrated innovation represents an international advanced level. “The \"Precise Denitration Technology for the Magnesium Metal Smelting Industry\" is primarily used to control the emission of nitrogen oxides (NOx) in the flue gases from the kiln firing stage and the reduction and refining stages in the magnesium metal smelting industry. To address the issues of the extremely short residence time of high-temperature flue gas in the calcination section at the optimal temperature for reduction-based nitrogen removal, resulting in insufficient nitrogen removal, the team developed a dual-mode combined precision nitrogen removal technology for high-temperature flue gas. This technology combines solid-reductant-based nitrogen removal methods with liquid-reductant-based ones, enabling rapid and effective removal of NOx from the high-temperature flue gas in the calcination section through differential coordination between the two modes. Additionally, ammonia-phenol wastewater from the lignite processing section is used as a catalyst to enhance the efficiency of high-temperature reduction-based nitrogen removal. Furthermore, to address the issues of low flue gas temperature and complex, unstable flue gas composition in the reduction and refining section, the team developed efficient oxidation denitration technologies for low-temperature flue gas, as well as techniques for simultaneous reduction of multiple pollutants. By utilizing the mechanism of chemical reactions mediated by microdroplets, they improved the efficiency of NOx removal from low-temperature flue gas. “The \"precision denitration technology for the metal magnesium smelting industry\" has been applied at Fugu Yu Feng Magnesium Alloy Co., Ltd. The industrial equipment for dual-mode combined precision denitration of high-temperature flue gas in the calcination section has been operating stably for 3 months now; the atmospheric emission concentration of NOx is below 400 mg/Nm3 (average value per hour). Meanwhile, 15 to 30 tons of ammonia and phenol-containing wastewater from the lignite carbonization section are treated on a daily basis ； The industrially-scale side-line unit consisting of three series-connected spray towers for \"wet flue gas desulfurization + oxidation + reduction absorption\" construction enables the NOx emission concentration in the flue gas from the reduction and refining section to meet the requirements of the \"Emission Standards for Air Pollutants in the Magnesium Industry in Northern Shaanxi\", demonstrating the technical feasibility and indicating that the conditions for industrial implementation are already in place. This technology solves the problem of NOx emission control in the magnesium metal smelting industry, offers good economic and social benefits, and is expected to drive technological progress in this sector. On the same day, the Yulin Zhongke Clean Energy Innovation Institute held a meeting to announce and discuss the achievements of this technology in Fugu, Yulin. It signed agreements with three magnesium metal enterprises in Fugu, and organized representatives from over 30 magnesium metal factories in Yulin to visit Yu Feng Magnesium Alloy Co., Ltd. in Fugu County for on-site exchanges.