rocketboy242 Posted March 3 Posted March 3 looking to solve the issue of removing small amount of trapped residual moisture from AP. Have dried in an oven at 110 degrees for 5 hours but still seems to hold on to some residual moisture. When ball milled, it cakes on the container walls. verry little air float when the container is opened. Thank you.
mx5kevin Posted March 3 Posted March 3 2 hours ago, rocketboy242 said: looking to solve the issue of removing small amount of trapped residual moisture from AP. Have dried in an oven at 110 degrees for 5 hours but still seems to hold on to some residual moisture. When ball milled, it cakes on the container walls. verry little air float when the container is opened. Thank you. Then there's something very wrong there, under a 100°C degrees oven spread thinly it must dry out completely about 2 hour. It does not tolerate heating much more than this because it starts to decompose and, at best case, just evaporates. It is worth placing thin baking paper underneath so that it does not come into direct contact with the hot backing dish, close to 200°C degrees NH4ClO4 are starting to decompose. It might be contaminated with something. It could be something that can't be evaporated. In this case, it must be dissolved twice in plenty of water and then recrystallized. The crystals should be dried as much as possible at room temperature and then in an oven. It is advisable to dry in a ceramic or heat-resistant baking dish. This should remove any material that doesn't belong there. If, for example, this contaminant is sodium perchlorate, it dries well in the oven, but it quickly absorbs moisture shortly afterwards.
mx5kevin Posted March 3 Posted March 3 Adhesion after grinding is natural to a certain extent, even if the oxidizer was heated beforehand. When heated again after ball milling, the powder loosens and all adhesion and clumping ceases. When heated before ball milled the crystals bind a certain amount of moisture, which can only be removed by heating again after grinding. I have experienced this phenomenon with most oxidizers. Therefore, it must be heated both before and after grinding. However, this must then be used directly in the composition. I use this method to prevent a previously milled oxidizer resist from sticking to the walls of the ball mill when it is put back into the ball mill, for example KNO3 for Black Powder.
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