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笔者运用明矾对水的净化作用及Na_2SO_4·10H_2O的溶解度曲线,对精制芒硝的传统方法进行了改进,拟定了精制芒硝的新流程:取朴硝适量,加入适量水和明矾,边加热边搅拌至完全溶解,此时温度约40℃。然后保持温度在35～40℃之间,静置沉淀约10分钟,除去浮在水面的白沫及杂质,用二层纱布趁热滤取上清液于洁净容器内,在0℃条件下过夜后,用二层纱布滤取沉淀物,回收上清液,供下次溶解朴硝用。最后
The author used Alum’s purification effect on water and Na_2SO_4·10H_2O solubility curve to improve the traditional method of refining Glauber’s salt and formulate a new process for refining Glauber’s salt: take appropriate amount of PuNan, add appropriate amount of water and alum, and stir until it is completely heated. Dissolve, at this time the temperature is about 40°C. Then maintain the temperature between 35 ~ 40 °C, let the precipitate settle for about 10 minutes, remove the foam and impurities floating on the surface of the water, use a two-layer gauze to filter the supernatant in a clean container, overnight at 0 °C After that, the precipitate was filtered off with a second layer of gauze, and the supernatant was recovered for the next time to dissolve the salt. At last