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Rust is obtained from rusted steel sources by shaving. Rust powder (1 g) is mixed with 20 g fatty acid mixture (FAM) and placed into the pan. Covered by a lid, the solution is boiled for 2 h, producing a thick smoke. This thick smoke diminishes in time, and the end product is a black gelatinous magnetic material.
Here is an oddity which I've observed that may have some bearing here. In the course of my regular work (testing the drop size and spary partterns of atomizing nozzles for an aerospace company) sometimes we work with water instead of jet fuel. The water in Holland MI is very iron rich. We have to filter it lest particles distort our measurments. Some tests call for plain, tap water. Other tests call for deionized. In both cases I use the same type of clear-sided filter cartridge plus. During the course of several days testing, I can observe the plain, white, fine-pore, media filter change color. Depending on whether or not my test employs a deioinizing thank the filter turns either rust red or black. With plain tap water, invariably the filter turns russet. But if the water has been first deionized, then instead the filter turn black. Now, it is a fact that deionized water is far more caustic than plain tap water. It will dissolve brass and copper from the pipes in which it runs and plate these metals downstream onto stainless. For this reason we generally avoid to use deionized water. My assumption for the change in color of filter media has always been that it was from reducing hematite somehow into magnetite. But, being no chemist, I cannot state this for certain.
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Posted:Jul 6, 2011
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