Humic acid (HA) was extracted by a hydrothermal method from Huolinhe lignite from Inner Mongolia. The effects of the alkali-to-carbon mass ratio. water-to-coal mass ratio. reaction temperature. https://www.roneverhart.com/ASUS-VivoBook-X515-15-6-FHD-Laptop-Intel-Core-i5-1135G7-2-4-GHz-Intel-Iris-Xe-Graphics-16GB-DDR4-RAM-1TB-SSD-Windows-/