Oil-bearing sands and shales, their mixtures as raw materials for fixing or dissociating carbon dioxide and NOx, and for producing cristalline silicium, hydrogen, silicon nitride, silicium carbide and silanes

摘要

Preparation of crystalline silicon and hydrogen and production of silicon nitride, silicon carbide, monosilanes and higher silanes using oil-containing sands and/or shales as raw materials, comprises treating the raw materials with the other reactants fluorine and hydrogen; and simultaneously separating the resulting amorphous aluminum fluoride using a floatation method and fine filtration. Preparation of crystalline silicon and hydrogen and production of silicon nitride, silicon carbide, monosilanes and higher silanes using oil-containing sands and/or shales as raw materials, comprises treating the raw materials with the other reactants fluorine and hydrogen, until the resulting very hot hydrogen fluoride transforms the silicate-containing rock into gaseous components such as silicon tetrafluoride and aluminum trifluoride, in order to allow the very hot gaseous silicon tetrafluoride, which is in the form of its salt, such as potassium hexafluorosilicate to react exothermally with aluminum grit to form crystalline silicon in the form of crystal flakes; and simultaneously separating the resulting amorphous aluminum fluoride using a floatation method and fine filtration and the obtained aluminum trifluoride is combined with the originally developed aluminum trifluoride, in order to later be freed of fluorine and re-converted by molten salt electrolysis into metallic aluminum, which itself can be used in the initial process once again, such that the separated crystalline silicon can be purified by zone melting method or can be allowed to directly chemically react with pure cold nitrogen to form silicon nitride while discharging heat, where: instead of the employed nitrogen, carbon resulting from the reaction can be used to produce silicon carbide, which like silicon nitride plays a role in the ceramic industry; the crystalline silicon has to be catalytically refined with hydrogen and/or monosilane to form monosilane or higher silanes, by means of which the mineral oil of the sands, acts as an agent for supplying the primary energy and is pyrolytically dissociated at greater than 100[deg]C largely into hydrogen and a graphite-likes mass, so that it is possible to remove the formed hydrogen of the hydrocarbon chain from the reaction to feed into existing pipeline systems of the natural gas industry, while the crystalline silicon can assume a leading energy-efficient role in the future because at greater than 350[deg] C, the above-mentioned silanes deliver atomic hydrogen, which has a half-life of half a second, and thus producing the strongest reducing chemical substance, while the resulting silicon radicals can be compared with the oxidation of atomic oxygen with respect to the energy capacity, which can be easily observed in atmospheric thunderstorms.