R. W. Veloso, I. C. F. Vasques, C. O. de Miranda, M. B. Júnior, J. W. V. de Mello
{"title":"铁铝氧化物共沉淀法固定化钕","authors":"R. W. Veloso, I. C. F. Vasques, C. O. de Miranda, M. B. Júnior, J. W. V. de Mello","doi":"10.1007/s13762-024-06116-3","DOIUrl":null,"url":null,"abstract":"<div><p>Mining exploration plays an important role in the state of Minas Gerais, but the generation of effluents when processing metals can release high concentrations of trace elements into water, such as rare earth elements, like neodymium. In areas affected by the generation of acid mine drainage, the problem becomes more critical due to the production of potentially polluting acidic waters because ores containing sulfides undergo oxidation when exposed to atmospheric conditions. The present paper aims to investigate the efficiency of iron and aluminum oxides as geochemical barriers to control the mobility of neodymium and to unravel the stability of precipitates. The removal of soluble neodymium was evaluated through the coprecipitation of this element with iron and aluminum (hydr)oxides. The concentration of soluble neodymium was evaluated in the supernatant by optical emission spectroscopy. The mineralogical phases in the precipitates were determined by X Rays diffraction. Stability was evaluated through chemical extractions. Overall, iron and aluminum precipitates provided a highly efficient removal of soluble neodymium (> 99%), showing that they can be promising alternatives for the treatment of acid drainage. Gibbsite, goethite, lepidocrocite and magnetite were detected in the precipitated phases, and only magnetite and lepidocrocite were identified in treatments with lower aluminum content. The greater presence of aluminum decreases neodymium removal and increases its recovery. Neodymium in iron and aluminum precipitates seems to be more stable under circumneutral conditions and, therefore, constant monitoring is needed to prevent neodymium loss.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"22 9","pages":"8095 - 8110"},"PeriodicalIF":3.0000,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Immobilization of neodymium by coprecipitation of iron and aluminum oxides\",\"authors\":\"R. W. Veloso, I. C. F. Vasques, C. O. de Miranda, M. B. Júnior, J. W. V. de Mello\",\"doi\":\"10.1007/s13762-024-06116-3\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Mining exploration plays an important role in the state of Minas Gerais, but the generation of effluents when processing metals can release high concentrations of trace elements into water, such as rare earth elements, like neodymium. In areas affected by the generation of acid mine drainage, the problem becomes more critical due to the production of potentially polluting acidic waters because ores containing sulfides undergo oxidation when exposed to atmospheric conditions. The present paper aims to investigate the efficiency of iron and aluminum oxides as geochemical barriers to control the mobility of neodymium and to unravel the stability of precipitates. The removal of soluble neodymium was evaluated through the coprecipitation of this element with iron and aluminum (hydr)oxides. The concentration of soluble neodymium was evaluated in the supernatant by optical emission spectroscopy. The mineralogical phases in the precipitates were determined by X Rays diffraction. Stability was evaluated through chemical extractions. Overall, iron and aluminum precipitates provided a highly efficient removal of soluble neodymium (> 99%), showing that they can be promising alternatives for the treatment of acid drainage. Gibbsite, goethite, lepidocrocite and magnetite were detected in the precipitated phases, and only magnetite and lepidocrocite were identified in treatments with lower aluminum content. The greater presence of aluminum decreases neodymium removal and increases its recovery. Neodymium in iron and aluminum precipitates seems to be more stable under circumneutral conditions and, therefore, constant monitoring is needed to prevent neodymium loss.</p></div>\",\"PeriodicalId\":589,\"journal\":{\"name\":\"International Journal of Environmental Science and Technology\",\"volume\":\"22 9\",\"pages\":\"8095 - 8110\"},\"PeriodicalIF\":3.0000,\"publicationDate\":\"2024-11-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Environmental Science and Technology\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s13762-024-06116-3\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Environmental Science and Technology","FirstCategoryId":"93","ListUrlMain":"https://link.springer.com/article/10.1007/s13762-024-06116-3","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
Immobilization of neodymium by coprecipitation of iron and aluminum oxides
Mining exploration plays an important role in the state of Minas Gerais, but the generation of effluents when processing metals can release high concentrations of trace elements into water, such as rare earth elements, like neodymium. In areas affected by the generation of acid mine drainage, the problem becomes more critical due to the production of potentially polluting acidic waters because ores containing sulfides undergo oxidation when exposed to atmospheric conditions. The present paper aims to investigate the efficiency of iron and aluminum oxides as geochemical barriers to control the mobility of neodymium and to unravel the stability of precipitates. The removal of soluble neodymium was evaluated through the coprecipitation of this element with iron and aluminum (hydr)oxides. The concentration of soluble neodymium was evaluated in the supernatant by optical emission spectroscopy. The mineralogical phases in the precipitates were determined by X Rays diffraction. Stability was evaluated through chemical extractions. Overall, iron and aluminum precipitates provided a highly efficient removal of soluble neodymium (> 99%), showing that they can be promising alternatives for the treatment of acid drainage. Gibbsite, goethite, lepidocrocite and magnetite were detected in the precipitated phases, and only magnetite and lepidocrocite were identified in treatments with lower aluminum content. The greater presence of aluminum decreases neodymium removal and increases its recovery. Neodymium in iron and aluminum precipitates seems to be more stable under circumneutral conditions and, therefore, constant monitoring is needed to prevent neodymium loss.
期刊介绍:
International Journal of Environmental Science and Technology (IJEST) is an international scholarly refereed research journal which aims to promote the theory and practice of environmental science and technology, innovation, engineering and management.
A broad outline of the journal''s scope includes: peer reviewed original research articles, case and technical reports, reviews and analyses papers, short communications and notes to the editor, in interdisciplinary information on the practice and status of research in environmental science and technology, both natural and man made.
The main aspects of research areas include, but are not exclusive to; environmental chemistry and biology, environments pollution control and abatement technology, transport and fate of pollutants in the environment, concentrations and dispersion of wastes in air, water, and soil, point and non-point sources pollution, heavy metals and organic compounds in the environment, atmospheric pollutants and trace gases, solid and hazardous waste management; soil biodegradation and bioremediation of contaminated sites; environmental impact assessment, industrial ecology, ecological and human risk assessment; improved energy management and auditing efficiency and environmental standards and criteria.