Alkali-Hydrothermal Treatment of K-Rich Igneous Rocks for Their Direct Use as Potassic Fertilizers
نویسندگان
چکیده
Due to the increasing demand for conventional sources of potassium (K) and their inaccessibility by African countries, K-rich igneous rocks are increasingly studied as potential alternative sources. In this study, six potassic (syenites trachytes) from Tamazeght, Jbel Boho, Ait Saoun, El Glo’a regions (Morocco) were sampled characterized. Then they hydrothermally treated enhance K release use fertilizers. The raw materials mainly formed microcline (up 74%), orthoclase (20–68%), albite (36–57%), biotite-muscovite (15–23%), titanite, calcite, hematite, apatite accessory minerals. These samples crushed milled reach a particle size <150 µm mixed with 4 N NaOH solution in an autoclave. liquid/solid (L/S) ratio was about 44 mL/50 g. powders allowed react at 170 °C 7 h. For all tests, reacted completely no liquid observed after treatment. X-ray diffraction (XRD), thermal gravimetric analysis (TGA), infrared spectroscopy (IRTF), scanning electron microscopy (SEM-EDS) carried out on characterize mineralogical structural changes due alkali-hydrothermal Indeed, revealed presence sodic neoformed phases such thermonatrite, sodalite, analcime, cancrinite. material leached week using deionized water elements released measured inductively coupled plasma–atomic emission (ICP-AES). hydrothermal process showed strong effect structure breakdown well other nutrients P, Fe, Si, Mg, Ca. Therefore, treatment 50.5 wt% K. Moreover, Ca, K, Si significantly increased. within (0.5–3.6), (3.5–31.4), (0.01–0.4), (0.01–0.3), (20–55), (4.6–8) mg/kg, respectively, whereas higher these elements. Quantitatively, releases (10–11.8), (60–70), (7–20), (1.2–15), (218–1278), (1119–2759) respectively. Consequently, (syenite trachyte) could be directly used fertilizers that would also source nutrients.
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ژورنال
عنوان ژورنال: Minerals
سال: 2021
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min11020140