Method for producing basic products from ash, in particular paper ash

A method for producing basic products from ash, comprising the following steps:

• i. providing a device structured to crush and to separate particles of a starting material;
• ii. providing ash as starting material in particle form;
• iii. crushing the particles of the starting material by pressure waves;
• and
• iv. directly subsequent to the crushing, separating the crushed particles into at least two fractions with different average particle sizes so that there is no procedural gap between the crushing of the particles and the separation and so that the crushing and the separating of the crushed particles occur in the same device,
• wherein the step of crushing the particles of the starting material by pressure waves is carried out using a high frequency pressure impulse (HFPI) crusher, and
• wherein the high frequency pressure impulse (HFPI) crusher is a HFPI crusher with in situ separator.