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Exploiting Differences Intensity Magnetic Separators (WHIMS) Enable Processing of Mineral Slurries

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Exploiting Differences Intensity Magnetic Separators (WHIMS) Enable Processing of Mineral Slurries SEPARATION Electro Overband Magnets at a Russian coal operation placed splitter. The electromagnetic Induced Roll Magnetic Separator operates in a similar way with a magnetic field generated electromagnetically. Non-metallic minerals such as feldspar, silica sand, and zircon are purified using these high-intensity magnetic separators.” The Magnetic Disc Separator features up to three electromagnetic discs spinning above a monolayer of dry tightly-sized minerals. Each disc is set to lift and separate minerals of differing magnetic susceptibility. Such technology is widely used in processing coltan and beach sands. Finally, Electromagnetic Filters and Wet High Exploiting differences Intensity Magnetic Separators (WHIMS) enable processing of mineral slurries. Single batch-fed or dual flip-flop Electromagnetic Filters remove weakly magnetic particles from non-metallic Paul Moore homes in on developments & available solutions minerals, whilst the WHIMS commonly in some of the core technology areas used in mineral concentrates magnetic minerals. separation with a focus on magnetic and gravity methods The company adds: “Controlled laboratory testing of diverse and often complex mineral eparation in mining is a broad church and Magnetic Head Pulleys. Overband and deposits identifies the optimum high-intensity includes equipment using technologies Suspension Magnets sit above transported ore, magnetic separator for any given application. Sbased on magnetic, gravity and density whilst Magnetic Head Pulleys replace standard Many mining operations, especially in Europe, methods, which have a vast range of applications head pulleys. In all three cases, tramp iron is are focused on developing reserves requiring from gold processing to iron ore, coal and other attracted to the magnetic field and automatically higher levels of processing or reprocessing minerals such as tin ores and mineral sands but extracted. Overband Magnets are the most materials previously classed as waste. Both also non-metallic industrial minerals. It includes commonly used magnetic separators and include increase the need for magnetic separation, a lot of very specific solutions for very specific a self-cleaning belt to transport captured iron whether to protect or purify.” problems, with each niche often involving only a away from the conveyed ore into a collection few potential suppliers and technology designs. area. Suspension Magnets (Overband Magnets Eriez on how magnetics are adapting As in the rest of the industry, a lot of current without the self-clean gear) hold the metal on the in core markets focus is on reduced use of water and energy but magnet face until manually-cleaned. Magnetic Jose Marin, Eriez Director, Minerals and Materials also recovering what was previously regarded as Head Pulleys attract metal to the conveyor Processing gave IM some insights into magnetic waste. surface, depositing underneath on leaving the solutions for higher purity industrial mineral Starting with magnetic methods, whether magnetic field. Recent Overband Magnet separation for which demand continues to grow protecting processing equipment or enhancing installations include a gold mine in Bulgaria and as new applications are released throughout the mineral purity, magnetic separation plays a key coal processing plant in Russia, with a Swedish world. “What does this mean to the producers of role in many mining and mineral processing iron ore processing plant using a number of large industrial minerals who proudly produce their operations. Bunting is one of the world’s leading diameter Magnetic Head Pulleys.” products, but find that the production run from designers and manufacturers of magnetic High-intensity magnetic separation enables yesterday will no longer suffice? Companies that separators for the mining and mineral processing the recovery or extraction of para and ferro do not want to get left behind must drive industries with European manufacturing facilities magnetic minerals. Such technology is widely technological advances to produce newer, more in the UK. used in the processing of non-metallic minerals, state-of-the art equipment. Equipment Magnetic separators utilise either permanent as well as specialist applications including advancements give companies the keys to unlock magnets or electromagnetic coils to generate coltan, beach sands and iron ore. Once again, the doors to new applications in changing markets. magnetic fields and are used to either remove magnetic force is generated by either high Magnetic separation is an important technology costly and damaging tramp iron or for mineral strength rare earth permanent magnets or that can help make significant improvements in beneficiation. Tramp iron occurs in the form of electromagnetic coils. products and minerals by delivering increased steel nuts and bolts, pit props, and even blasting Bunting adds: “High-intensity Drum Magnets recovery. Like most technologies, magnetic caps, damaging crushers, screens and conveyors. and Rare Earth Roll Magnetic Separators utilise separation equipment manufacturers are Removal commonly occurs early in the process, the extreme magnetic force of permanent constantly searching for improvements and before the primary and secondary crushers and neodymium rare earth magnets. In both efficiency gains in all possible processes to stay screens. technologies, a tightly-sized, dry mineral feed relevant and remain on the cutting edge.” Bunting told IM: “The three most commonly passes over the drum or roll surface, with The dry vibrating magnetic filter is a unique used tramp iron magnetic separators are magnetically-susceptible minerals attracted, piece of equipment for processing very dry fine Overband Magnets, Suspension Magnets and deflected and separated using a strategically industrial minerals and materials requiring an 44 International Mining | APRIL 2021 SEPARATION extremely high level of purity. High level of purity milling circuit? Marin says that unless worn out metallurgical and mechanical performance. Even in this case means a very low level of metallic balls and chips (scats) are magnetically removed, though significant improvements on wet drums impurities. “The lithium industry is one of the those hard pieces of metal remain in the circuit took place during the 90s and early 2000s, we industries that benefits from the power of the until they are milled into a fine metallic powder continue to see further improvement in reliability matrix type separator which uses not only a and eventually make it to the concentrators and features on this product category.” strong background magnetic field, but the (flotation, gravity or magnetic). “Knowing this, Eriez developed a hybrid magnetic element magnification of the field within the matrix to the real question becomes: Why spend so much with one objective in mind: improve iron recovery capture very fine magnetic particulates that no energy milling the milling media? Ball mills are in the rougher stage of magnetite concentration. other piece of equipment can capture. Some of designed to mill ore and can do that very Comparative tests performed at an iron ore plant the contamination of lithium compounds is in a effectively when trunnion magnets are utilised. proved iron recovery performance. “A comparison form single digit micron ferrous particles or While ball mill manufacturers are already was performed on self-levelling CDA wet drums weakly magnetic materials, such as wear and incorporating trunnion magnet systems into new that were 48 in diameter by 125 in wide with a tear of 304 Stainless Steel. These are easily ball mills, these can also be retrofitted in existing 1,000 gauss interpole magnetic element versus collected in the matrix while the lithium ball mills. The most important thing to remember the hybrid element. It should be noted the hybrid compounds flow through the matrix.” when considering a retrofit is that the ball mill is element develops peaks of 3,500 to 4,000 gauss, Marin adds: “Consider that producers of full of chips. The mill will undergo a massive as opposed to 2,100 gauss on the 1,000 gauss lithium carbonate 10 years ago would seek evacuation of chips during the first two to three interpole element. In addition to the hybrid contamination levels of 200 ppm of metal or less. weeks of operation which causes a reduction in element, a number of other magnetic elements Current market demand is for lithium carbonate power draw. This can be adjusted by adding a exist. Selection of elements depends on the with less than 50 ppb. There are no pieces of higher load of fresh ore to bring the system back application, minerals, and their magnetic equipment that can purify this ultra-fine powder to normal.” susceptibility, such as transitional magnetite more effectively than the DVMF.” The 5000, Eriez states that the trunnion magnet has which is known for lower magnetic susceptibility gauss DVMF consists of a solenoid clad type of undergone a series of improvements in recent of magnetite.” electromagnet where there is a vibrating canister years, including: This ore can easily be separated and through the open bore. The coils are driven quite n New wash water manifold to better wash the concentrated using the Salient Pole RE wet drum. hard and generate a substantial amount of heat ore off the chips Not all gold processing plants have a gravity that requires dissipation through the surface of n The barrel has been fitted with a 6 in circuit in their flowsheet, but those that do Marin the electromagnet and force
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