Some high-sulfur lignites were extracted with aqueous alkaline solution obtained from the water-soluble fraction of tea waste ash. High-sulfur removal from lignites was possible by this method. The effects of temperature, the amount of tea waste ash used, extraction time, and stirring speed were studied in the ranges 5?35 g, 350?550 K, 0.042?1.7 MPa, 15?60 min, and 300?600 rev/min, respectively. The extents of pyritic and organic sulfur removal were investigated.
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Ayhan Demirbaş (2000) studied this question.
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