Alumina crucible is a fragile and consumable item that can be reused. However, some customers find residues after using it several times. How should it be cleaned?
First, the best effect is to wash it according to the type of sample you make. For example, if it is an inorganic salt, you can soak it with the corresponding soluble acid to remove most of the salt, then rinse it with clean water and deionized water, then dry it in an oven, and finally bake it in a muffle furnace at 900 degrees for 2 hours. It can be used after cooling down. The following is a general treatment method.
1. Put the hot alumina crucible into a water solution with detergent for ultrasonic cleaning, mainly to remove oil stains, and then thoroughly wash off the detergent with clean water;
2. Soak it overnight in a mixed solution of hydrochloric acid and nitric acid (hydrochloric acid: nitric acid: water = 5:1:4), heat and boil for 2 hours, take it out, and rinse it with clean water, rinse it with deionized water, and dry it in an oven at 120 degrees for 2 hours.
3. Put the dried alumina crucible into a muffle furnace and heat it to 900℃ (this temperature can meet most usage requirements, and the temperature can be higher if required) and calcine for 2 hours. Cover it to prevent dust during roasting, and cool it naturally to room temperature before use.
Note: The heating rate must not be too fast, otherwise the crucible will peel (explosive damage).
Through this method, the alumina crucible can be cleaned thoroughly. At this time, the crucible should be spotless, otherwise it means it is not cleaned. If you know the samples you made and wash them in a targeted manner, you can clean them more cleanly without copying this method completely.
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