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Fertilizer derived from alkaline hydrothermal alteration of K-feldspar: A micrometer to nanometer-scale investigation of K in secondary reaction products and the feldspar interface

文献类型：期刊论文

作者Zhai, Yuanyuan2,4,7,8; Hellmann, Roland3,5; Campos, Andrea1; Findling, Nathaniel3,5; Mayanna, Sathish6,9; Wirth, Richard9; Schreiber, Anja9; Cabie, Martiane1; Zeng, Qingdong2,7,8; Liu, Shanke7,8
刊名APPLIED GEOCHEMISTRY
出版日期2021-03-01
卷号126页码:22
关键词Alkaline hydrothermal alteration Potassium fertilizer from feldspars Coupled interfacial dissolution-reprecipitation (CIDR) Analytical transmission electron microscopy (TEM) Energy filtered TEM (EFTEM) Field emission SEM (FESEM) FESEM-EDXS Chemical phase mapping Fluid-rock interaction Solid-fluid interfaces
ISSN号0883-2927
DOI10.1016/j.apgeochem.2020.104828
英文摘要Global food security concerns have spurred increasing demand for locally sourced and produced K-fertilizers. Various processes have been explored for more than a century; one promising solution is based on the alkaline aqueous alteration of feldspar-rich rocks at elevated temperatures. However, knowledge of the overall physicochemical reactions comprising dissolution of feldspar and precipitation of secondary phases is still rudimentary, in particular how the feldspar structure evolves at the nm-scale during hydrolysis at alkaline conditions. Here we report on the results of a study aimed at converting potassium feldspars to K-rich fertilizer based on the alteration of sanidine and microcline samples at 190 degrees C in pH 12 Ca(OH)(2) solutions for 24 h. Based on X-ray diffraction and Rietveld refinement, the secondary authigenic minerals that precipitated are primarily composed of Cacarbonate (calcite, vaterite), and Ca-(Al)-silicates, such as tobermorite and hydrogrossular. Short-term bench top leaching experiments in water prove that the hydrothermal product releases up to two orders of magnitude more K than the unaltered K-feldspar starting material, pointing to its application as a ready-to-use fertilizer for K-deficient soils. Detailed chemical mapping and energy dispersive X-ray spectroscopy (FESEM- and TEM-EDXS) analyses of the precipitates at the um to nm-scale show that the distribution of K associated with the secondary phases is very heterogeneous, both spatially and in terms of concentrations. Using various analytical transmission electron microscopy (TEM) techniques, e.g., HRTEM, TEM-EDXS, EFTEM, to investigate the structure and chemistry of the feldspar interface, we find no evidence for a change in chemistry or structure at the nm-scale, even though dissolution continuously decreases the volume of each grain. Our observations also show the existence of an amorphous surface altered layer (SAL) of variable thickness (10-similar to 100 nm) forming at the feldspar interface. Nanometer-scale chemical measurements show that this amorphous SAL is rich in K, and therefore may also be an important reservoir of easily leachable K. We hypothesize that it forms continuously and in situ at the expense of the feldspar by a coupled interfacial dissolution-reprecipitation process (CIDR).
资助项目Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China)[2006BAD10B04] ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Spark Program of China[2007EA173003] ; State Scholarship Fund ; ISTerre-BQR grants ; Helmholtz Recruiting Initiative[I-044-16-01]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000632987200001
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Spark Program of China ; Spark Program of China ; Spark Program of China ; Spark Program of China ; State Scholarship Fund ; State Scholarship Fund ; State Scholarship Fund ; State Scholarship Fund ; ISTerre-BQR grants ; ISTerre-BQR grants ; ISTerre-BQR grants ; ISTerre-BQR grants ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Spark Program of China ; Spark Program of China ; Spark Program of China ; Spark Program of China ; State Scholarship Fund ; State Scholarship Fund ; State Scholarship Fund ; State Scholarship Fund ; ISTerre-BQR grants ; ISTerre-BQR grants ; ISTerre-BQR grants ; ISTerre-BQR grants ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Spark Program of China ; Spark Program of China ; Spark Program of China ; Spark Program of China ; State Scholarship Fund ; State Scholarship Fund ; State Scholarship Fund ; State Scholarship Fund ; ISTerre-BQR grants ; ISTerre-BQR grants ; ISTerre-BQR grants ; ISTerre-BQR grants ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Projects in the National Science & Technology Pillar Program during the Eleventh Five-Year Plan Period (China) ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Knowledge Innovation Project of the Chinese Academy of Sciences ; Spark Program of China ; Spark Program of China ; Spark Program of China ; Spark Program of China ; State Scholarship Fund ; State Scholarship Fund ; State Scholarship Fund ; State Scholarship Fund ; ISTerre-BQR grants ; ISTerre-BQR grants ; ISTerre-BQR grants ; ISTerre-BQR grants ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative ; Helmholtz Recruiting Initiative
源URL[http://ir.iggcas.ac.cn/handle/132A11/101045]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Hellmann, Roland
作者单位1.Aix Marseille Univ, CNRS, Cent Marseille, FSCM,FR1739,CP2M, F-13397 Marseille, France
2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
3.CNRS, ISTerre, CS 40700, F-38085 Grenoble 9, France
4.Shenzhen Xinhua Middle Sch, Shenzhen 518109, Peoples R China
5.Univ Grenoble Alpes, CS 40700, F-38085 Grenoble 9, France
6.Carl Zeiss Microscopy GmbH, D-73447 Oberkochen, Germany
7.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
8.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
9.Helmholtz Ctr Potsdam, GFZ Deutsch GeoForschungsZentrum, Interface Geochem Sekt 3 5, D-14473 Potsdam, Germany
推荐引用方式
GB/T 7714		 Zhai, Yuanyuan,Hellmann, Roland,Campos, Andrea,et al. Fertilizer derived from alkaline hydrothermal alteration of K-feldspar: A micrometer to nanometer-scale investigation of K in secondary reaction products and the feldspar interface[J]. APPLIED GEOCHEMISTRY,2021,126:22.
APA Zhai, Yuanyuan.,Hellmann, Roland.,Campos, Andrea.,Findling, Nathaniel.,Mayanna, Sathish.,...&Liu, Jianming.(2021).Fertilizer derived from alkaline hydrothermal alteration of K-feldspar: A micrometer to nanometer-scale investigation of K in secondary reaction products and the feldspar interface.APPLIED GEOCHEMISTRY,126,22.
MLA Zhai, Yuanyuan,et al."Fertilizer derived from alkaline hydrothermal alteration of K-feldspar: A micrometer to nanometer-scale investigation of K in secondary reaction products and the feldspar interface".APPLIED GEOCHEMISTRY 126(2021):22.

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来源：地质与地球物理研究所

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