| 摘要 |
<p>In order to sort ore from associated mineral material, a method of classifying an object 1 is provided, the method comprising feeding the object 1 along a feed path 3, irradiating the object 1 with infra-red radiation of a first wavelength, the radiation of the first wavelength being focussed onto an irradiation zone intersecting the feed path 3, the irradiation zone having a length in the vertical plane substantially greater than its width in the vertical plane. The intensity of radiation emitted by the object 1 at at least one second wavelength different from the first wavelength is examined, the second wavelength being characteristic of a first class of object 1 (in this case, the ore to be sorted from the mineral), whereby the classification of the object 1 may be derived. <IMAGE></p> |
