Black powder milling process

By changing the running conditions of the mill it is possible to get other particle sizes. The Jet-Mill is a central part of the new method of making black powder. However some old elements can be used. According to L vold the process can be depicted by the scheme ... 

The process starts with the preparation of polymer solutions, for instance, polyvinyl alcohol (PVA), and metal compounds, for instance, 3d-metal chlorides. Afterwards, the solutions with a certain concentration are mixed in the ratio PVA-metal chloride equals to 20 1-1 5 (better 5 1). Then the prepared solutions are dried till they obtain gel-like colored films with further temperature elevation up to 100°C. The films obtained are controlled by spectral photometry, and also with help of transmission optical microscopy, atomic force microscopy and X-ray photoelectron spectroscopy. When the film color changes to black, the films are heated in the furnace according to the following program 100-200-300-400°C. As a result, the dark porous semiproduct with many microcracks is formed, that is milled in spherical or jet mill. The nanopowder obtained is steamed and dispersed in hot water. After filtration, the powder is dried and tested with the help of Raman spectroscopy. X-ray photoelectron spectroscopy, transmission electron microscopy and electron microdiffraction. 

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