Method for separating mineral impurities from calcium carbonate-containing rocks by X-ray sorting

摘要

The present invention relates to a method for separating mineral impurities from calcium carbonate-containing rocks by comminuting the calcium carbonate-containing rocks to a particle size in the range of from 1 mm to 250 mm, separating the calcium carbonate particles by means of a dual energy X-ray transmission sorting device.

主权项

1. A method for separating accompanying mineral impurities from calcium carbonate-containing rocks by
comminuting and classifying the calcium carbonate-containing rocks to a particle size in the range of from 1 mm to 250 mm, separating the calcium carbonate particles by removing the particles comprising components other than calcium carbonate by means downstream of a detection area and controllable by computer-controlled evaluating means as a function of sensor signals resulting from radiation penetrating a flow of said particles, said radiation being emitted by an X-ray source and captured in at least one sensor means, wherein X-radiation is permitted to pass at least two filter devices in relation to mutually different energy spectra positioned upstream of the at least one sensor means and sensor lines with a plurality of individual pixels positioned transversely to the particle flow as sensor means, a sensor line being provided for each of the at least two filters, wherein there is a Z-classification and standardization of image areas for determining an atomic density class on a basis of the sensor signals of X-ray photons of different energy spectra captured in at least two sensor lines.