• TECHNOLOGY
Laser sorting Laser sorting is an emerging technology that takes advantage of laser-induced breakdown spectroscopy ( LIBS ). This method involves focusing a high-energy laser beam onto the ore surface , causing it to vapourise and emit plasma . The emitted light is then analysed to identify the elemental composition of the material .
Sensing the way forward Sensor sorting of ores using XRF , XRT , optical and laser methods has ushered in a new era of efficiency and sustainability in the mining industry . These cutting-edge technologies enable real-time , automated ore separation , leading to reduced energy consumption , minimised waste generation and increased overall profitability .
The key advantage of laser sorting lies in its ability to perform real-time , in-line elemental analysis without the need for sample preparation . It is particularly effective in sorting complex ores containing a wide range of elements and compounds .
Leveraging sensor sorting in mining operations Each of these sensor sorting technologies offers unique benefits to mining operations and their successful integration can lead to substantial improvements in efficiency , productivity and sustainability .
Combining XRF and XRT sorting can yield superior results as the processes complement other ’ s strengths . XRF is excellent at identifying and quantifying major and trace elements , while XRT can efficiently separate materials based on density , effectively removing barren gangue early in the process .
The integration of optical and laser sorting technologies can be advantageous in dealing with complex ores . Optical sorting excels in recognising visual properties , while laser sorting provides detailed elemental information , creating a comprehensive and reliable sorting system .
As mining companies continue to invest in sensor sorting technologies , the mineral processing sector can expect even more advanced and integrated systems that further optimise the ore processing chain , ultimately benefiting both the industry and the environment . Through these innovations , mining operations are poised to extract maximum value from their resources while moving towards meeting their environmental goals . •
Optical sorting excels in separating ores with complex mineralogy .
Dr Nicolaas C Steenkamp is an independent consultant , specialising in geological , geotechnical and geometallurgical projects and mining project management . He has over two decades of industry experience with global exposure . ( ncs . contract @ gmail . com )
Dr Nicolaas C Steenkamp
22 • African Mining • April 2024 www . africanmining . co . za