Process and apparatus for working up pyrotechnical material

A - Human Necessities – 62 – D

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A62D 3/38 (2007.01) B01D 45/12 (2006.01) B01D 47/16 (2006.01) B01D 50/00 (2006.01) F23G 7/00 (2006.01) F23J 15/00 (2006.01) F42B 33/06 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2099222

In order to work up pyrotechnical material, I. the pyrotechnical material is burned in a controlled manner, the slag is optionally allowed to continue reacting and the crude gas formed is passed through a high-temperature region in which the gas is exposed to a temperature of at least 1200°C over a predetermined period in order to decompose organic substances still present; II. the crude gas formed during the combustion is cooled to a temperature below 400 C; III. the crude gas is purified under dry conditions by first feeding it into a preliminary separator, coarse particles being separated off, and then feeding the crude gas via fine dust filters in order to separate off finely divided solids and/or IV. the crude gas is optionally purified under wet conditions by first passing it through a rotary scrubber and then passing it via one or more absorption units and V. the purified gas is released as waste air. In a variant of this process, pyrotechnical material A, where predominantly alkaline reaction products are formed, and pyrotechnical material B, where predominantly acidic reaction products are formed, are subjected to controlled combustion in the first stage.

L'invention concerne un matériau pyrotechnique. I. Le matériau pyrotechnique est brûlé de manière contrôlée; on peut facultativement laisser continuer le laitier à réagir et on fait passer le gaz brut ainsi formé dans une zone à haute température où il est exposé à des températures d'au moins 1 200 oC pendant une période prédéterminée pour faire se décomposer les substances organiques présentes. II. Le gaz brut formé pendant la combustion est refroidi à une température inférieure à 400 oC. III. On purifie le gaz brut au sec en le faisant passer dans un séparateur préliminaire où les particules grossières en sont retirées, puis en le faisant passer dans des filtres à poussière fine afin d'en enlever les solides fins et/ou IV. On purifie facultativement le gaz brut dans des conditions humides en le faisant d'abord passer dans un laveur rotatif et ensuite dans une ou plusieurs unités d'absorption. V. Le gaz purifié est refoulé comme air épuisé. Dans une variante de ce processus, le matériau pyrotechnique A, où se forment des produits de réaction essentiellement alcalins, et le matériau pyrotechnique B, où se forment des produits de réaction essentiellement acides, sont soumis à une combustion contrôlée au cours de la première étape.

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