METHOD FOR THE CONTINUOUS PRODUCTION OF A MIXTURE WITH A PRE-DEFINED RATIO OF FULLY COLORED AND NON-COLORED PARTICLES AND SYSTEM AND USE THEREOF

The present disclosure relates to a method for the continuous production of a mixture with a predefined ratio of fully colored and non-colored particles. The method comprises a continuous separation step in which a particle stream A is separated into a particle stream C and one or more parallel particle streams B1, B2, ... Bn in a predefined ratio, a continuous coloring step in which the particles from parallel particle streams B1, B2, ... Bn obtained from the separation step are colored with a non-rub-off coloring agent, such that the particles are fully colored, a continuous joining step in which the parallel particle streams B1, B2, ... Bn obtained from the coloring step and comprising the colored particles are joined with the particle stream C comprising the non-colored particles downstream of the separation step, and, optionally, an additional process step in which the stream obtained from the joining step is further processed. The present disclosure further relates to a system for the continuous production of a mixture with a predefined ratio of fully colored and non-colored particles and to the use of the system. The present disclosure finally relates to ammonium nitrate-based or calcium ammonium nitrate -based fertilizer particles, wherein about 1 weight% of the particles is colored by a layer of a water-soluble, polymeric coloring agent, all particles are coated by a layer of a non-coloring coating agent, and wherein the layer of the non-coloring coating agent is on top of the layer of the coloring agent of the colored particles.