Fine metal sorting

The high-resolution X-ray camera has made it possible to detect and sort grain sizes as small as 0.2 inches.

TOMRA Sorting Recycling has launched the new X-TRACT X6 FINES for high-purity sorting of mixed non-ferrous metal fractions. The unprecedented technology was unveiled Aluminum USA, in Nashville, Tennessee.   

X-TRACT X6 FINES detects and sorts small metal grains of almost half the size of what was previously sortable. This breakthrough capability has been achieved by developing TOMRA’s exclusive and field-proven high-speed X-ray transmission (XRT) technology, which sorts materials according to differences in their density.

Broad-band radiation penetrates the materials in the sorting line to obtain spectral absorption, which is measured by the X-ray camera. The process identifies the atomic density of the materials regardless of their thickness.  

Increasing the sensitivity of the high-resolution X-ray camera has made it possible to detect and sort grain sizes as small as 0.2 inches, thus measurably reducing product losses. Extensive trials of the X-TRACT X6 FINES in high-throughput applications have proven the machine’s ability to consistently attain unrivalled purity levels of 98-99 percent.   

Similar X-TRACT, X-TRACT X6 FINES is equipped with TOMRA’s Duoline Dual Energy Technology. This employs two independent devices with different spectral sensitivities, so that materials are sorted regardless of the material’s thickness. By detecting and prioritizing between singleobject and area processing, Duoline recognizes differences in objects overlapping on the sorting belt, a significant advantage when lines are running higher throughputs.  

Whereas previous X-TRACT models sorted materials into high- and low-density fractions, the new X-TRACT X6 FINES has multiple density channels. This allows a greater number of classes for separating materials according to density, achieving greater sorting precision even with mixed metals and small grain sizes.