Abstract: The present invention relates to a method of physical and energetic utilization of silicon components that are obtained in electrical scrap recycling. In order to create a recycling method which is effective in terms of time, plant technology and energy, it is proposed that a silicon component be dissolved in an alkali under the process pressure (p) and a first suspension temperature in the range from 50° C. to equal to or greater than the boiling point of the alkali at the process pressure p. After the silicon has been dissolved, the resultant suspension is filtered for separation of meta-, di- and oligosilicate, and the second suspension temperature is maintained during the filtration within the temperature range specified from 50 to less than the boiling point of the alkali.

Abstract: A method for separating reusable materials of a composite component comprising multiple material layers is presented. The composite component comprises a material layer which absorbs energy of a radiation source and at least one plastics film. With the aid of the radiation source, the composite component is heated in less than a second in an exposure field, with chemical compounds of the plastics material being cleaved, as a result of the heating of the absorbing material layer, in a boundary layer of the at least one plastics film which faces the absorbing material layer, resulting in a creation of gas. Prior to heating, at least one predetermined breaking point is introduced into the plastics film in such a way that the plastics film breaks in a controlled fashion at the predetermined breaking point under the pressure of the created gas.