| 摘要 |
A method of recovering humic acids from a material such as oxidised coal is provided. This method includes the steps of mixing the material with aqueous alkali, particularly aqueous sodium hydroxide, heating the mixture to a temperature above 100 DEG C. and below 180 DEG C. under sufficient pressure to prevent evaporation of the water, and maintaining the elevated temperature for a time, generally less than 2 hours, sufficient to extract a substantial amount of the available humic acids from the material.
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