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AssigneeGeneral Electric Company
InventorsChandrashekhar Sonwane, Samuel D. Draper, Lawrence B. Kool
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A method for removing at least one impurity from coal is described herein. The method includes providing coal comprising a plurality of impurities and contacting the coal with an acid solution in a reaction chamber. At least one of the impurities reacts with the acid solution to produce one or more first products soluble in the acid solution. The method further includes removing at least a portion of the acid solution including at least a portion of the first products from the reaction chamber and adding a nitrate composition to the reaction chamber to form a nitrate solution. At least one of the impurities, at least one of the first products, or combinations thereof react with the nitrate composition to produce one or more second products soluble in the nitrate solution. The method still further includes removing at least a portion of the nitrate solution including at least a portion of the second products from the reaction chamber.
A method for removing at least one impurity from coal, the method comprising:
The method of claim of 1, wherein the plurality of impurities comprise oxides of aluminum, iron, potassium, calcium, sodium, minerals, inorganic and organic sulfur compounds, alkalis, ash, or combinations thereof.
Dependencies are inferred from the claim text.