1, the choice of materials: the use of fresh purlin, will be attached to the surface of the mud, dirty spots washed, and then remove the ganglion and rot. 2. Refining: Wash the rake section by hand or shredder, and use a stone mill or beater to grind the mash. When the slurry is being refined, cast water while adding mash to make the mash that has been milled evenly and delicately. The finer the mash, the more slurry, the higher the powder yield. 3. Washing and Filtering: Rinse the ground mash into a white gauze bag and sew it with a jar, pot or other container. While stirring the mixture, add water and stir until the slurry in the slag is washed. 4, the bleaching pulp: the rinse rinsed out of the raft slurry plus appropriate amount of fresh water bleaching 1-2 days, 1 slurry per day. After the compaction is completed, remove the supernatant and fine slag from the surface with a scoop, and take the middle slurry in another container and continue to dilute and re-precipitate with fresh water. This is repeated 1-2 times to achieve the quality requirement of white powder. 5, drying: After the rinsing of the precipitated thorium powder with a clean cloth bag, hanging let it drain water. After that, wet the powder into 1-2 kilograms of powder meal, and then cut the wolfberry meal into 1-1.50 cm thick glutinous rice flour. Spread it on a bamboo sieve and expose it to the baking room to dry it. Let it be dried (baked) until it is used by hand. One touch is broken. The finished product is white powder, with a water content of about 15%.
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