Quantification of Critical Elements
Determination of Elemental Impurities in Delay Compositions
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Ferrochrome silicon alloys (FexSiCry) and lead tetroxide (Pb3O4) are commonly used in pyrotechnics for the production of delay charge elements in millisecond electric detonators (DEM). The ignition delay does not only depend on the molar ratio of major elements, but also on purity of raw materials. Therefore, a very accurate and efficient analytical method is needed for quality control.
Pyrotechnic compositions aim to develop an acustic (sound), optical (light or smoke), thermical (heat) or mechanical (pressure) effect. Mostly, these are known for civil use as fireworks for amusement. But, the range of applications is even broader. Pyrotechnics are essential for industrial and military use e.g. for desinfestation with smoke set up and exploders in mining or building industries. The crucial step is the spontaneous and exothermic reaction of an oxidizing agent (Pb3O4, Fe3O4, SnO2) with a fuel (reducing agent e.g. FexSiCry, MgxAly, Bi2S3). The mixtures are optimized according to the final application, e.g. by adding catalyst or other additives.
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