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2026

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08

Application of High-Specific-Surface-Area Calcium Hydroxide in Flue Gas Desulfurization in the Steel Industry

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In the steel industry, flue gases from sintering machines, pelletizing kilns, reheating furnaces, and hot blast stoves exhibit a wide temperature range, high dust and sulfur content, and frequent operational fluctuations, placing stringent demands on the adaptability and reaction activity of desulfurization agents. Conventional desulfurizers often suffer from incomplete reactions, excessive reagent consumption, and unstable desulfurization performance, whereas high‑specific‑surface‑area calcium hydroxide is ideally suited to the complex desulfurization conditions encountered in the steel sector.
This product is tolerant of a wide flue‑gas temperature range, from 90 to 350°C, and maintains high reactivity even under low‑temperature conditions, thereby addressing the longstanding challenge of low desulfurization efficiency in steel‑industry flue gases. Its highly porous structure enables rapid adsorption of sulfides in the flue gas, with a reaction rate far exceeding that of conventional calcium‑based materials. In dry‑process desulfurization, it eliminates the need for water spraying to cool the gas, significantly reducing equipment corrosion and operational‑maintenance failures.
In steel‑industry power‑plant boilers and sintering flue‑gas treatment projects, the use of high‑specific‑surface‑area calcium hydroxide enables highly efficient and stable desulfurization, with a consistent removal efficiency exceeding 99%. At the same time, reagent consumption is low, and the by‑products cause no secondary pollution; they can be utilized as building‑material raw materials or road‑base fillers. This approach simultaneously meets environmental standards and promotes resource recycling, effectively reducing the costs of ultra‑low‑emission retrofits for steel enterprises and is compatible with flue‑gas treatment across all types of steelmaking furnaces.

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