Dry separation of particles of milled starting mixture having potassium raw salts, comprises e.g. adding auxiliary materials to starting mixture, conditioning, charging formed intermediate mixture and separating components

摘要

Dry separation of particles of milled components from a starting mixture containing different potassium raw salt, comprises: (a) adding particles of an auxiliary material to the starting mixture to form an intermediate mixture; (b) conditioning the intermediate mixture; (c) friction-electrically charging the intermediate mixture; (d) electrostatically separating the components of intermediate mixture; (e) feeding the mixture of separated particles and components to be separated in a system for gravity separation, and (f) separating the components from the auxiliary material. Dry separation of particles of milled components from a starting mixture containing different potassium raw salt, where the component to be separated is present in less amount in the total portion of the remnant of the starting mixture, comprises: (a) adding particles of an auxiliary material to the starting mixture, so that an intermediate mixture is formed, where (a1) the frictional electric characteristic of the auxiliary material is selected in such a manner that the particle of the auxiliary material in a reciprocal frictional electric charge of the particle of the intermediate mixture is electrically homogeneous with the components to be separated, (a2) the added amount of the particle of the auxiliary material is selected in such a manner that the electrical capacity of the sum of the portion of the components to be separated and the auxiliary material is approximately equal to the electrical capacity of the total portion of the residual components of starting mixture, and (a3) the density of the particle of the auxiliary material is significantly different from the density of the particle of the component to be separated; (b) carrying out a conditioning step on intermediate mixture, where the conditioning step is adapted to a subsequent electrostatic separation of the components to be separated, together with the particles of the auxiliary materials from the particles of the residual components of the intermediate mixture takes place; (c) friction-electrically charging the intermediate mixture; (d) electrostatically separating the components of the intermediate mixture by means of an electrostatic separation device, in one or more steps, where the particle of the auxiliary material and the components to be separated are separated together; (e) feeding the mixture of separated particles from auxiliary material and components to be separated in a system for gravity separation, and (f) separating the components to be separated from the auxiliary material in the system for gravity separation, preferably the components to be separated is separated from the auxiliary material particles based on density difference.