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Alunite is a hydroxylated aluminium potassium sulfate mineral, formula K Al 3 (S O 4) 2 (OH) 6. It was first observed in the 15th century at Tolfa, near Rome, where it was mined for the manufacture of alum. First called aluminilite by J.C. Delamétherie in 1797, this name was contracted by François Beudant three decades later to alunite. [8 ...
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5 kwi 2024 · Many different minerals, such as alum schist, alunite, bauxite, and cryolite, are used in the extraction process to get alum. One must first extract the initial mineral using a specialized procedure. Calcination is the process that alunite goes through for alum conversion.
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Forms a series with natroalunite. Alunite group. Occurrence: Formed between 15 C and 400 C by the action of sulfate, which may be generated from pyrite or solfataric action, on aluminous rocks, commonly accompanied by kaolinitization and silicification. Kaolinite, halloysite, diaspore, pyrite, gypsum, quartz.
These considerations have resulted in a modified general chemical formula being proposed for jarosite compounds: A1 − x (H 3 O) x Fe 3 − y [ (OH) 6 − 3y (H 2 O) 3y (SO 4) 2] (Kubisz, 1970). Many solid solutions are complete among most or all synthetic jarosite species (Dutrizac and Jambor, 2000).
Alunite is a siliceous adsorbent extracted from the jarosite group, consisting of 50% SiO2, widely used for dye adsorption due to its layered compounds that enhance its adsorption properties. AI generated definition based on: Science of The Total Environment, 2020
