Kalunite From K, Potassium, and Alunite, The Ore


Kalunite From K, Potassium, and Alunite, The Ore :

A process for extracting aluminum from alunite, a naturally occurring basic sulfate of aluminum and potassium having the idealized formula KAl3(SO4)2(OH)6. Based on an invention made by G.S. Tilley in 1924. The ore is first dehydrated at up to 6000C. It is then leached with a solution of sulfuric acid and potassium sulfate. After clarification of the leachate, potassium alum is crystallized out. Hydrothermal treatment of potassium alum precipitates a basic potassium alum, K2SO4♦3Al2O3♦4SO3♦9H2O, simultaneously regenerating potassium sulfate and sulfuric acid. Calcination of this potassium alum yields a mixture of alumina and potassium sulfate, which is leached out. (Check source for accuracy of chemical formula)

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