Abstract: A method for decomposing nitrogen fluoride or sulfur fluoride, comprising contacting gaseous nitrogen fluoride or sulfur fluoride with a solid reagent comprising elemental carbon, one or more of the alkaline earth metal elements and optionally one or more of the alkali metal elements, to fix the fluorine component in the nitrogen fluoride or sulfur fluoride in said reagent.

Abstract: Fluorocarbons including perfluorocarbons and hydrofluorocarbons are highly efficiently decomposed by contacting a gaseous fluorocarbon with a reagent comprising carbon and an alkaline earth metal or carbon, an alkaline earth metal and an alkali metal at an elevated temperature, the decomposed halogen being fixed to the reagent.

Abstract: A method for decomposing nitrogen fluoride or sulfur fluoride, comprising contacting gaseous nitrogen fluoride or sulfur fluoride with a solid reagent comprising elemental carbon, one or more of the alkaline earth metal elements and optionally one or more of the alkali metal elements, to fix the fluorine component in the nitrogen fluoride or sulfur fluoride in said reagent.

Abstract: Fluorocarbons including perfluorocarbons and hydrofluorocarbons are highly efficiently decomposed by contacting a gaseous fluorocarbon with a reagent comprising carbon and an alkaline earth metal or carbon, an alkaline earth metal and an alkali metal at an elevated temperature, the decomposed halogen being fixed to the reagent.

Abstract: To insure that rejects or scraps of composite materials such as printed wiring boards that consist of the mixture of metal and non-metal parts are separated into the metal and non-metal components with good precision so that both components can be recovered as recyclable valuables, the composite materials are broken into pieces by means of a shearing machine or the like and the pieces are thereafter ground with a hammer mill or the like to form a mixed powder consisting of metal and non-metal particles, which mixed powder is then fed continuously on to a belt conveyor inclined at an angle with respect to a line perpendicular to the direction of travel, whereby the metal particles are efficiently separated from the non-metal particles; the recovered metal particles being fed to an electrostatic separator to obtain higher grade of concentration by removing the non-metal inclusions.