Wild pueraria lobata can't extract powder, because you didn't follow strict steps. 1. Starch should be extracted from the recovered pueraria lobata as soon as possible within 3 ~ 5 days, so as to avoid mildew affecting the quality, transforming and decomposing carbohydrates and reducing the flour yield. 2, 2. Cleaning and scraping the skin: cut off the kudzu root dug back from the ground with a knife, remove the stem, tail hair, lateral roots and damaged parts, soak it in clean water for 1 ~ 2 hours, wash off the sediment and impurities, pick it up, scrape off the skin with a knife, then wash it with clean water and drain it. 3. Beating and filtering: The washed kudzu roots are ground into pulp with a special refiner, or cut into root segments with a length of 65,438+00 cm and a diameter of about 5 cm, and put into a beater for beating, and water is added at the same time. Then add a proper amount of clear water to the slurry for dilution, stir it evenly, and filter it with 80 mesh and 100 mesh steel wire mesh respectively to remove ribs and residues. If there is no refiner and wire screen, it can also be crushed manually with a mallet in a wooden trough or mashed with a stone mortar. Then put it into a filter bag, put it into a cylinder filled with clean water and knead it repeatedly until the starch is washed out, and then filter the powder slurry in the cylinder with gauze to remove the residue; Or pour it into a special wooden barrel with a piston at the bottom, which contains most of the clear water, and filter to remove the residue. Beating and filtering: the washed kudzu roots are ground into pulp with a special refiner, or cut into root segments with a length of 10cm and a diameter of about 5 cm, and put into a beater for beating, and water is added while crushing. Then add a proper amount of clear water to the slurry for dilution, stir it evenly, and filter it with 80 mesh and 100 mesh steel wire mesh respectively to remove ribs and residues. If there is no refiner and wire screen, it can also be crushed manually with a mallet in a wooden trough or mashed with a stone mortar. Then put it into a filter bag, put it into a cylinder filled with clean water and knead it repeatedly until the starch is washed out, and then filter the powder slurry in the cylinder with gauze to remove the residue; Or pour it into a special wooden barrel with a piston at the bottom, which contains most of the clear water, and filter to remove the residue. 5. After drying and moisture absorption, remove the white cloth, separate the upper yellow powder with a shovel and put it in a container for later use. Then, the wet powder in the sedimentation tank or tank is taken out, and the bottom slag foam is removed, and then the pure kudzu powder is sent to a drying room to be dried by slow fire, or by an electric stove or a microwave oven, or put into a clean bamboo tray or a drying pad, and dried in a ventilated, sunny and pollution-free place, thus obtaining the silvery pure Ge Fen. The separated yellow powder can also be dried and stored.