4.7 Article

The hydrothermal alkaline alteration of potassium feldspar: A nanometer-scale investigation of the orthoclase interface

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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

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Summary: Global food security concerns have led to an increased demand for locally sourced and produced K-fertilizers. This study explores the conversion of potassium feldspars into K-rich fertilizers through hydrothermal treatment, showing a significant increase in K release compared to unaltered sources. The heterogeneous distribution of K associated with secondary phases and the presence of an amorphous surface altered layer (SAL) at the feldspar interface provide insights into potential reservoirs of leachable K.

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