Journal of Sustainable Metallurgy ( IF 2.5 ) Pub Date : 2022-04-20 , DOI: 10.1007/s40831-022-00524-w Veera Brahmacharyulu Angalakuditi 1, 2 , Ramarao Gujare 1 , Ramados Anbarasu 1 , Thimmappa Gandikoti 1 , Srinivas Rao Raydurg 1 , Lokendra Raj Singh 1 , Saroj Sundar Baral 2
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It was observed that the oxides of sulfur and nitrogen (SOx and NOx), in large concentrations, were getting released from certain wind boxes of the sinter machine. The deposits in the wind legs were characterized and particulates with spherical, cubical, needle, and bar-like morphologies containing K, Na, and Cl were noticed. Nitrogen-based solids were found in clutter-like morphology. Some particles had a mixture of the above, SOx and NOx. These deposits were dissolved at room temperature in the solutions of sodium bicarbonate, urea, and di-sodium borate deca-hydrate (borax) in water to estimate the absorbance of K, Na, Cl, Ca, Mg, S, and N-based compounds. The solution of sodium bicarbonate did not capture NOx. SOx and NOx were not present in the filtrates of urea and borax. A solution of sodium bicarbonate in water 1% v/v was sprayed into a wind box and found that SOx had got reduced by 90% and NOx by about 55%. To maximize the capture of SOx and NOx, the solution was optimized at 2% v/v and found that both SOx and NOx had got reduced by 90%. A deposit from the electrostatic precipitator (ESP) was dissolved in acetone, hexane, and toluene and found that polychlorinated dibenzo para-dioxins and polychlorinated dibenzofurans (PCDD/Fs) have got broken down. Injecting nitrogen where PCDD/Fs are released is also suggested as an economical solution.
Graphical Abstract
中文翻译：
铁矿石烧结机风管中 SOx、NOx 和 PCDD/Fs 的表征和原位减排
据观察，高浓度的硫和氮的氧化物（SO x和 NO x）从烧结机的某些风箱中释放出来。对风腿中的沉积物进行了表征，发现了具有球形、立方体、针状和棒状形态的颗粒，其中含有 K、Na 和 Cl。以杂波状形态发现基于氮的固体。一些颗粒具有上述SO x和NO x的混合物. 这些沉积物在室温下溶解在碳酸氢钠、尿素和十水合硼酸二钠（硼砂）的水溶液中，以估计 K、Na、Cl、Ca、Mg、S 和 N 基的吸光度化合物。碳酸氢钠溶液没有捕获 NO x。尿素和硼砂的滤液中不存在SO x和 NO x 。将 1% v/v 的碳酸氢钠溶液喷洒到风箱中，发现 SO x减少了 90%，NO x减少了约 55%。为了最大限度地捕获 SO x和 NO x，将解决方案优化为 2% v/v，发现 SO x和 NO x减少了 90%。将静电除尘器 (ESP) 的沉积物溶解在丙酮、己烷和甲苯中，发现多氯二苯并二恶英和多氯二苯并呋喃 (PCDD/Fs) 已分解。在释放 PCDD/Fs 的地方注入氮气也是一种经济的解决方案。
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