Research on Activation High Efficient Extraction Technique of Humic Acid Briquette Binder

According to the traditional alkali extraction technique hard to alkali insoluble calcium humate, magnesium humate and others extracted from lignite and the lower extraction rate status, with acid applied to as an activator, alkali-insoluble humate was converted to humic acid.Then with alkali applied as an extraction agen t, sodium humate type briquette binder could be extracted.The paper had a study on the active acid, type of the extracted alkali, reaction time, reaction temperature and other conditions of the acid activation-alkali extraction technique affected to the viscosity of the binder and the extraction rate of humic acid.The technical parameters s uitable for the sodium humate extracted from lignite were screened. The results showed that with the humic acid extracted from the lignite as the briquette binder with H CI as an acid activator, the extraction effect with NaOH would be better than Na2CO3.The acid activated reaction time as 60 minutes and the reaction temperature of th e acid activation and the alkali extraction would be best in 8595 °C.Under the temperature of 90。C, after 60 minutes HCI activation of the lignite, with NaOH extraction f or one hour, the extraction rate of humic acid could be improved from the 55.9% of the traditional alkali extraction technique to 96.7% of the acid activation-alkali extrac tion technique.