{"title":"从矿山尾矿中提取镁用于二氧化碳矿化:硫酸铵与尾矿比例对产品和产量影响的初步研究","authors":"Marjut Mälkki, Sampo Mäkikouri","doi":"10.1016/j.hydromet.2024.106268","DOIUrl":null,"url":null,"abstract":"<div><p>Carbon capture and storage is needed to achieve deep cuts in industrial carbon dioxide (CO<sub>2</sub>) emissions. One option for storing carbon dioxide is its mineralization, which is especially useful in regions with available mine tailings but no nearby geological formations suitable for carbon dioxide storage. A multi-step mineralization route has been developed at Åbo Akademi University. In this study the first step, thermal extraction of magnesium, was further improved for two magnesium-rich Finnish mine tailings as raw materials. In the experiments, the maximum yield of extracted magnesium was similar (57–65%) to that of previous studies for both tailings with a ratio of 1:3 of mine tailings to ammonium sulfate ((NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>), but only slightly better than with a ratio of 1:2 (55–58%). It was also found that increasing the average temperature from 410 to 460 °C slightly decreased the yield. Moreover, increasing the amount of the extracting agent, ammonium sulfate, can increase the possibility of obtaining efremovite ((NH<sub>4</sub>)<sub>2</sub>Mg<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>) instead of magnesium sulfate (MgSO<sub>4</sub>). This new knowledge of the effect of the reagent ratios on the formation of extraction products like efremovite could be exploited in further studies to minimize water consumption and thus energy use in ammonium sulfate recycling.</p></div>","PeriodicalId":13193,"journal":{"name":"Hydrometallurgy","volume":null,"pages":null},"PeriodicalIF":4.8000,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0304386X24000082/pdfft?md5=40ccdb0d7cd8da0b4421c49e6dd22c4f&pid=1-s2.0-S0304386X24000082-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Extraction of magnesium from mine tailings for carbon dioxide mineralization: A preliminary study of the effect of ammonium sulfate to tailings ratio on products and yield\",\"authors\":\"Marjut Mälkki, Sampo Mäkikouri\",\"doi\":\"10.1016/j.hydromet.2024.106268\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Carbon capture and storage is needed to achieve deep cuts in industrial carbon dioxide (CO<sub>2</sub>) emissions. 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Moreover, increasing the amount of the extracting agent, ammonium sulfate, can increase the possibility of obtaining efremovite ((NH<sub>4</sub>)<sub>2</sub>Mg<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>) instead of magnesium sulfate (MgSO<sub>4</sub>). 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引用次数: 0
摘要
要实现工业二氧化碳(CO2)排放量的大幅削减,就需要进行碳捕集与封存。储存二氧化碳的一种方法是将其矿化,这在有矿山尾矿但附近没有适合储存二氧化碳的地质构造的地区特别有用。奥博阿卡德米大学开发了一种多步骤矿化路线。在这项研究中,以两种富含镁的芬兰矿山尾矿为原料,对第一步(热提取镁)进行了进一步改进。在实验中,两种尾矿与硫酸铵((NH4)2SO4)的比例为 1:3,提取镁的最高产量(57-65%)与之前的研究结果相似,但仅略高于比例为 1:2(55-58%)。研究还发现,将平均温度从 410 °C 提高到 460 °C 会略微降低产率。此外,增加萃取剂--硫酸铵的用量,可以增加获得埃弗罗莫石((NH4)2Mg2(SO4)3)而不是硫酸镁(MgSO4)的可能性。在进一步的研究中,可以利用试剂配比对萃取产物(如埃弗里莫石)形成的影响这一新知识,最大限度地减少硫酸铵回收利用过程中的耗水量,从而降低能耗。
Extraction of magnesium from mine tailings for carbon dioxide mineralization: A preliminary study of the effect of ammonium sulfate to tailings ratio on products and yield
Carbon capture and storage is needed to achieve deep cuts in industrial carbon dioxide (CO2) emissions. One option for storing carbon dioxide is its mineralization, which is especially useful in regions with available mine tailings but no nearby geological formations suitable for carbon dioxide storage. A multi-step mineralization route has been developed at Åbo Akademi University. In this study the first step, thermal extraction of magnesium, was further improved for two magnesium-rich Finnish mine tailings as raw materials. In the experiments, the maximum yield of extracted magnesium was similar (57–65%) to that of previous studies for both tailings with a ratio of 1:3 of mine tailings to ammonium sulfate ((NH4)2SO4), but only slightly better than with a ratio of 1:2 (55–58%). It was also found that increasing the average temperature from 410 to 460 °C slightly decreased the yield. Moreover, increasing the amount of the extracting agent, ammonium sulfate, can increase the possibility of obtaining efremovite ((NH4)2Mg2(SO4)3) instead of magnesium sulfate (MgSO4). This new knowledge of the effect of the reagent ratios on the formation of extraction products like efremovite could be exploited in further studies to minimize water consumption and thus energy use in ammonium sulfate recycling.
期刊介绍:
Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties.
Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.