Method for comprehensively utilizing crop straw

[0017] Embodiment 1: the preparation of gac

[0018] Raw material processing: cleaning and drying the anaerobic fermentation residue of straw. Then, zinc chloride was formulated into a solution of about 50 degrees Baume. After filtering, the pH value is adjusted to 6 with hydrochloric acid, and then poured into the raw materials in a ratio of 3-4, that is, 300-400 catties of adjusted zinc chloride solution is added for every hundred kg of raw materials. Immerse at a temperature above 40-50°C, stir well and let stand for 5 hours, stir again and let stand for 5 hours, so that the zinc chloride solution is completely absorbed, if not fully absorbed, then extend the time.

[0019] Carbonization and activation: Put the mixed raw materials into a carbonization furnace and heat them in a closed carbonization furnace. The carbonization temperature is 300-450°C for about 30-60 minutes. For carbonization, pay attention not to see open flames, and constantly turn over the material to m...