Silicon and process for its production.

Method for producing silicon which is suitable as starting material for preparing a silicon melt for the fabrication of silicon blocks or silicon crystals, comprising the following steps: a) introducing into a reactor a mixture of gases based on a silicon-containing gas and an auxiliary gas, b) thermal decomposition of the gas mixture with formation of silicon powder, c) separation of the silicon powder formed from the gas mixture, d) mechanical compaction of powder separate silicon, characterized in that e) the mechanical compaction is performed with compactors cylinders (18, 19) at least on the roller jacket (25) are of a ceramic material.