![]() During the last decade XRT has been applied to an increasing extent in the minerals processing industry (von Ketelhodt and Bergmann, 2010 Sasman, Deetlefs, and van der Westhuyzen, 2018). XRT makes use of X-ray imaging techniques to analyse objects and materials, and has a wide range of applications from baggage scanning for security purposes (Martz et al., 2016), to recycling of waste material (Owada, 2014). Keywords: XRT, diamonds, De Beers, DMS, sorting. ![]() This is an area of ongoing R&D and it is only a matter of time before the breakthrough emerges. The technical challenge remains in the finer sizes, for high-capacity-machines as direct alternatives to conventional diamond recovery technologies. At the Jwaneng mine Large Diamond Pilot Plant (LDPP), the objective is to recover diamonds in the size fraction -45 +25 mm. The results were very encouraging, and tests are planned for both green- and brownfield kimberlite environments, as well as to explore an alternative to conventional techniques in final diamond recovery. The next application was tests on coarse alluvial gravels as an alternative to dense medium separation. The same machines are now available with ejection capability to produce high final product grades. The first applications in the marine environment used the technology in an auditing mode, and served as a useful early predictor of diamond content weeks ahead of sorthouse returns. This is the result of intensive R&D conducted over the years to arrive at a suite of machine embodiments capable of sorting and auditing diamonds across all size ranges. In the De Beers Group, applications of XRT are found across kimberlite, alluvial, and marine operations. X-ray transmission (XRT) sorting has become the preferred recovery technology option in several parts of the diamond-winning flow sheet. Mangeraĭe Beers Technologies (SA), Johannesburg, South Africa The application of XRT in the De Beers Group of companiesĪ.
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