从黑河褐煤中提取腐植酸钠工艺的研究

Extraction Process of Sodium Humate from Heihe Brown Coal

利用黑河褐煤为原料,用硝酸改性提高腐植酸含量,并通过单因素实验和均匀设计实验,研究影响提取腐植酸钠的主要因素,优选了提取工艺条件:反应温度50℃;液固比3∶1;反应时间40 min;硝酸浓度3 mol/L,此条件下煤样中总腐植酸含量达到77.68%。

Using Heihe brown coal as the raw material, with modification of nitric acid toincnease humic acid content, the single factor and uniform design experiments were made. The main factors of humic acid sodium extrac- tion were determined. The optimum conditions were： reaction temperature 50℃ ; liquid to solid ratio 3：1 ; reaction time 40 rain; nitric acid concentration 3 mol/L. Under these conditions, the total humic acid content of coal was up to 77.68%.