Dissolution of EAF slag minerals in aqueous media: Effects of sonication on brownmillerite and gehlenite

IF 8.7 1区 化学 Q1 ACOUSTICS Ultrasonics Sonochemistry Pub Date : 2024-09-11 DOI:10.1016/j.ultsonch.2024.107065
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Abstract

The accumulation of electric arc furnace slag (EAFS) in landfills has been causing severe environmental problems. This study examines the dissolution properties of EAFS minerals, including brownmillerite and gehlenite, essential for their possible use in resource recovery. An investigation was conducted to compare the effects of sonication and stirring on mineral dissolution while also assessing the usage of citrate as a complexing agent for gehlenite. Synthetic brownmillerite and gehlenite minerals were dissolved in aqueous solutions at room temperature using a 1:100 g/ml ratio. The dissolved elements were measured using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), while zeta potential and X-ray Photoelectron Spectroscopy (XPS) were used to assess changes in surface chemistry. Brownmillerite had significant dissolution extents, with Al and Ca dissolving up to 16 % and 8 %, respectively, in contrast to gehlenite, which dissolved less than 2 % under similar conditions. Sonication significantly increased the dissolution of brownmillerite by up to 100 %, although its impact on gehlenite dissolution varied depending on the duration of time. Besides, adding citrate enhanced the leaching of Al and Ca from gehlenite by facilitating complexation. XPS data demonstrated differences in elemental ratios on brownmillerite and gehlenite surfaces affected by the method used and the presence of citrate. Lastly, the dissolution extents of Al and Ca from EAFS were up to 12 %, depending on time and mixing method, with a preference for sonication over stirring. In conclusion, this study showed that minerals in EAFS have distinct dissolution characteristics, and sonication and citrate can considerably enhance dissolution.

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电解铝炉渣矿物在水介质中的溶解:超声对褐铁矿和辉绿岩的影响
电弧炉炉渣(EAFS)在垃圾填埋场的堆积已造成严重的环境问题。本研究探讨了 EAFS 矿物的溶解特性,包括对资源回收利用至关重要的褐铁矿和鹅翎石。研究比较了超声和搅拌对矿物溶解的影响,同时还评估了柠檬酸盐作为gehlenite络合剂的使用情况。在室温下,以 1:100 克/毫升的比例将合成褐铁矿和辉绿岩矿物溶解在水溶液中。使用电感耦合等离子体光学发射光谱(ICP-OES)测量溶解元素,同时使用 zeta 电位和 X 射线光电子能谱(XPS)评估表面化学变化。褐辉石的溶解度很大,铝和钙的溶解度分别高达 16% 和 8%,与之形成鲜明对比的是,在类似条件下,沸石的溶解度不到 2%。虽然超声波对褐铁矿溶解的影响因时间长短而异,但超声波能明显增加褐铁矿的溶解度,最高可达 100%。此外,添加柠檬酸盐可促进络合作用,从而提高铝和钙从钨锰矿中的浸出率。XPS 数据显示,受所用方法和柠檬酸盐存在的影响,褐铁矿和辉绿岩表面的元素比率存在差异。最后,根据时间和混合方法的不同,EAFS 中铝和钙的溶解度最高可达 12%,其中超声比搅拌更有优势。总之,这项研究表明,EAFS 中的矿物具有独特的溶解特性,而超声和柠檬酸盐可以大大提高溶解度。
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来源期刊
Ultrasonics Sonochemistry
Ultrasonics Sonochemistry 化学-化学综合
CiteScore
15.80
自引率
11.90%
发文量
361
审稿时长
59 days
期刊介绍: Ultrasonics Sonochemistry stands as a premier international journal dedicated to the publication of high-quality research articles primarily focusing on chemical reactions and reactors induced by ultrasonic waves, known as sonochemistry. Beyond chemical reactions, the journal also welcomes contributions related to cavitation-induced events and processing, including sonoluminescence, and the transformation of materials on chemical, physical, and biological levels. Since its inception in 1994, Ultrasonics Sonochemistry has consistently maintained a top ranking in the "Acoustics" category, reflecting its esteemed reputation in the field. The journal publishes exceptional papers covering various areas of ultrasonics and sonochemistry. Its contributions are highly regarded by both academia and industry stakeholders, demonstrating its relevance and impact in advancing research and innovation.
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