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ANALYSIS AND SORTING underground stoping areas due to reduced cutoff grades.
Designed specifically for customers who want to take their recovery process on the road, the new STEINERT mobile series allows for precise mining sensor sorting anywhere a power source and fairly level ground can be found. The modules are connected together as " plug and play " units and enable rapid commissioning at the customer ' s premises. The integrated pneumatic supply and optional power supply enable operation even throughout remote regions. The system is transported by sea or by truck and the containers are provided with appropriate lashing points. Delivery is via three truck loads, each with a 40 ft container. Included are all of the components which are required for handling, transport and maintenance: including an Ore Sorter with two sensors which can be used separately or in combination.
The STEINERT XSS T( X-ray transmission)“ sees” through the materials, recognising different material densities, components containing halogens, and organic components. Composite materials and internal adhesions are also detected.“ In mining, X-ray transmission is probably one of the most versatile types of sensors; it can be widely used in narrow vein mining applications where there is a difference in density between the vein and the host rock. It measures amount of X-ray radiation absorbed within individual particles and negates the effect of particle size by measuring the radiation at two different energy levels.”
The Induction Sorting System ISS is the preferred solution to recover the non-ferrous metals not recovered by ECS processing or magnetic separation.
TOMRA’ s new laser sorting offering
TOMRA Sorting Mining, the leading sensor-based sorting systems manufacturer, introduced its innovative multi-channel laser sorting technology at AIMEX, the international Asia-Pacific Exhibition, in Sydney, Australia, in August 2017.“ The new laser sorting technology will enable quartz and gold processes to achieve higher recovery, better quality and more consistent sorting of quartz material than can be secured using other sensor technologies.” Minerals which could not be differentiated with existing technologies, such as colour-sorting, X-ray transmission or near-infrared sensors, can now be identified and separated. The new ore sorting technology enables the user to define and apply a greater number of sorting criteria, and thus sort with much greater precision. The laser identification technology consists of a multichannel laser scanning system with highresolution imaging, and cutting-edge colour and textural selectivity. Multiple material characteristics such as brightness, colour, size, shape and surface texture are processed simultaneously.
“ Although it is a relatively new technology in the mining sector, sensor-based sorting has the potential to address some of the major challenges the industry now faces: declining ore grades, rising production costs, water shortages and ever-increasing environmental regulations. Worldwide, TOMRA sorting systems already contribute to increased productivity by delivering enhanced processing which is appreciably more energy-efficient and impressively more costeffective. In addition, TOMRA’ s sensor-based solutions can secure profitable recovery from marginal waste and mining blocks, which helps to extend the life of mining operations and thus optimise and increase the overall value of deposits.”
Commenting on the potential of advanced sorting technologies, Anthony Sacca, Managing Director of TOMRA Sorting Australia, said:“ The application of sensor-based sorting can significantly change the way materials are processed. Our new laser sorting technique, for example, is unlocking previously untapped opportunities for quartz and gold processes – an innovative and highly cost-efficient solution which significantly increases the viable lifespan of these valuable deposits. We can achieve higher recovery, better quality, and more consistent sorting of quartz material with laser sorting than with other sensor technologies.”
In the diamond industry, Australia’ s Merlin Diamonds recently advised that a TOMRA X-Ray Transmission Machine has been delivered to the minesite. The first kimberlite ore to be processed by the XRT will be from the + 20 mm oversize material on the ROM pad and the significant amount( over 150,000 t) of + 20 mm kimberlite ore processed by Rio Tinto during previous production.
This material will be used to fully
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������������������ ������������������������� ������������������������� ������������������ commission the XRT sorter over the coming months and any contained large diamonds up to 40 mm in size will be recovered. Recovery of large diamonds was not previously possible due to equipment limitations.“ There is a possibility of over 150,000 t of material which can be processed for several months without significant mining costs until the company commences mining the higher grade kimberlite from the Gwain pit. The XRT sorting process uses the detection of the carbon atomic density of diamond( similar to airport X-ray security systems) to separate diamonds from surrounding waste. This is in contrast to previous traditional X-ray luminescence sorting machines that rely on diamonds to luminescence when exposed to X-rays. However, a proportion of diamonds display low luminescence and may not have been recovered.” It is expected that the new processing technology will also improve diamond recovery efficiencies in the + 4mm material compared to past practices that may have not recovered some diamonds with low luminescence. The XRT sorters work more efficiently, more accurately, faster and more cost effectively than conventional equipment. XRT sorters are becoming more accepted by mining companies with large diamond populations. IM
FEBRUARY 2018 | International Mining 17