Extraction Study of Nitro Humic Acid from Lignite by Dry and Wet Process

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Nitro humic acid was extracted from lignite of Guizhou Anshun, which production condition and process were studied. The results show that the optimum conditions of dry process are concentration of nitric acid of 40%, reaction temperature of 95°C, reaction time of 5 min. The optimum conditions of wet process production are concentrations of nitric acid of 20% ~ 25%, the solid-liquid ratio of 1:1.25 (weight ratio), reaction temperature of 80 ~ 85°C, and reaction time of 30 min.

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119-123

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December 2013

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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