{"id":8148,"date":"2024-01-06T00:22:58","date_gmt":"2024-01-06T08:22:58","guid":{"rendered":"https:\/\/recyclemachine.net\/?page_id=8148"},"modified":"2024-10-30T07:24:53","modified_gmt":"2024-10-30T06:24:53","slug":"recyclingnieuws","status":"publish","type":"page","link":"https:\/\/www.energycle.com\/nl\/recyclingnieuws\/","title":{"rendered":"Recycling Nieuws"},"content":{"rendered":"
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Recycling News<\/h2>\n<\/div><\/div><\/div><\/div><\/div><\/section><\/div> <\/div> \r\n\t\t\t\r\n\t\t\t
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\t\t\t\t\t\t\t\r\n\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i> Categories <\/span>buying-guides<\/a>, Recycling News<\/a><\/span>\r\n\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t<\/i> \r\n\t\t\t\t\t\t\tPosted on <\/span>\r\n\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t
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Desktop Plastic Shredder: Complete Guide to Types, Specs & Applications<\/a><\/h4><\/div>\t\t\t
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Discover the best small plastic bottle shredder machines designed for efficient, space-saving recycling. Ideal for small businesses and home setups, these shredders turn waste into reusable flakes, cutting costs and boosting sustainability. Learn key features, top models, and why Energycle leads the market\u2014empower your recycling efforts today with expert insights and buyer tips.<\/div>\r\n\t\t\t<\/div>\r\n\r\n\t\t\t
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\t\t\t\t\t\t\t\r\n\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i> Categories <\/span>Recycling News<\/a><\/span>\r\n\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t<\/i> \r\n\t\t\t\t\t\t\tPosted on <\/span>\r\n\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t
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Eddy Current Separator: Working Principle, Types, Specs & Selection Guide<\/a><\/h4><\/div>\t\t\t
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An eddy current separator<\/strong> (ECS) recovers non-ferrous metals \u2014 aluminum cans, copper wire, brass fittings, zinc die-castings \u2014 from mixed waste streams by exploiting electromagnetic repulsion. If your recycling line processes municipal solid waste (MSW), auto shredder residue (ASR), electronic scrap, incineration bottom ash (IBA), or PET bottle flakes contaminated with aluminum closures, an eddy current separator is how you pull the non-ferrous value out. This guide covers the physics behind the technology, every ECS type Energycle offers, real operating parameters, and a step-by-step framework for specifying the right separator for your application.<\/p>
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What Is an Eddy Current Separator?<\/h2>
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An eddy current separator is an electromagnetic sorting machine that separates non-ferrous metals from non-metallic materials on a conveyor belt. The core mechanism: a high-speed magnetic rotor spinning inside a non-metallic shell drum generates rapidly alternating magnetic fields. When conductive metals pass through these fields, electric currents (eddy currents) are induced inside the metal pieces, creating their own magnetic fields that oppose the rotor's field. The resulting repulsive force launches non-ferrous metals forward off the belt, while non-conductive materials (plastic, glass, wood, paper) simply fall off the belt end by gravity.<\/p>
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The separation force depends on a material's conductivity-to-density ratio<\/strong>. Aluminum (high conductivity, low density) separates most easily. Copper and brass (high conductivity but higher density) require stronger fields or slower belt speeds. Stainless steel and lead respond poorly to eddy current separation due to low conductivity or very high density.<\/p>
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How Does an Eddy Current Separator Work?<\/h2>
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The working principle follows Faraday's Law of electromagnetic induction and Lenz's Law. Here is the step-by-step process:<\/p>
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Step 1: Material Feeding<\/h3>
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Pre-sorted material (ferrous metals already removed by magnetic drum or overband separator) feeds onto the ECS conveyor belt as a thin, uniform layer. A vibratory feeder upstream ensures monolayer distribution \u2014 stacked particles reduce separation efficiency by 30\u201350%.<\/p>
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Step 2: Magnetic Field Exposure<\/h3>
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As material reaches the head pulley, it passes over the magnetic rotor spinning at 2,000\u20135,000 RPM inside a stationary shell. The rotor contains alternating N-S-N-S permanent magnets (typically NdFeB rare-earth) arranged around its circumference. This creates a rapidly changing magnetic field at the belt surface.<\/p>
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Step 3: Eddy Current Induction<\/h3>
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When a conductive metal piece enters this alternating field, circulating electric currents (eddy currents) are induced within the metal. Per Lenz's Law, these eddy currents generate their own magnetic field that opposes the external field \u2014 creating a repulsive (Lorentz) force that pushes the metal piece away from the rotor.<\/p>
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Step 4: Trajectory Separation<\/h3>
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Three forces act on each particle simultaneously: (1) the eddy current repulsive force (forward\/upward), (2) belt conveyor momentum (forward), and (3) gravity (downward). Non-ferrous metals, receiving the additional repulsive kick, follow a longer trajectory and land in the \"metals\" collection bin. Non-conductive materials simply drop off the belt end into a separate \"non-metals\" bin. An adjustable splitter plate between the two bins lets operators fine-tune the cut point.<\/p>
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Types of Eddy Current Separators<\/h2>
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Different applications require different ECS designs. The main distinction is rotor geometry \u2014 concentric vs. eccentric \u2014 which determines the magnetic field pattern and optimal particle size range.<\/p>
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Concentric Pole Rotor ECS<\/h3>
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The magnetic rotor is centered inside the shell drum. This produces a uniform, symmetrical field pattern ideal for standard recycling applications<\/strong> where particle sizes range from 20\u2013150 mm. Concentric ECS units are the industry workhorse \u2014 used in MSW recycling, construction & demolition (C&D) waste, auto shredder residue, and general scrap processing. They offer reliable separation at high throughput with lower maintenance costs.<\/p>
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Eccentric Pole Rotor ECS<\/h3>
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The magnetic rotor is offset (eccentric) inside the shell, creating an intense but localized field zone. This concentrates maximum magnetic energy at the separation point, making eccentric ECS units effective for fine particles down to 5 mm<\/strong>. Applications include IBA (incinerator bottom ash) processing, zorba\/zurik sorting, WEEE (waste electrical and electronic equipment) recovery, and fine aluminum recovery from glass cullet. Our high-recovery ECS for fine aluminum<\/a> uses this design.<\/p>
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High-Frequency ECS<\/h3>
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Uses more magnetic poles (typically 18\u201330 poles vs. 12\u201316 on standard units) and higher rotor speeds to create rapid field alternation. This design targets the smallest non-ferrous particles (5\u201320 mm) where standard concentric units lose effectiveness. High-frequency ECS is essential for fine fraction processing in IBA plants, wire-chopping lines, and small WEEE recycling.<\/p>
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Wet Eddy Current Separator<\/h3>
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Processes material in a water slurry rather than on a dry belt. Used where the feed is already wet (e.g., slag quench water, heavy media plant tailings) or where dust control is critical. Less common than dry ECS but necessary in specific metallurgical and mining applications.<\/p>
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Eddy Current Separator Type Comparison<\/h2>
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Type<\/th>Particle Size Range<\/th>Rotor Speed<\/th>Poles<\/th>Best Applications<\/th>Recovery Rate<\/th><\/tr>
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Concentric (Standard)<\/td>20\u2013150 mm<\/td>2,000\u20133,500 RPM<\/td>12\u201316<\/td>MSW, C&D, auto shredder, general scrap<\/td>90\u201395%<\/td><\/tr>
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Eccentric<\/td>5\u201350 mm<\/td>3,000\u20135,000 RPM<\/td>14\u201322<\/td>IBA, WEEE, zorba\/zurik, fine aluminum<\/td>85\u201393%<\/td><\/tr>
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High-Frequency<\/td>5\u201320 mm<\/td>3,500\u20135,000 RPM<\/td>18\u201330<\/td>Fine fraction IBA, wire chopping, small WEEE<\/td>80\u201390%<\/td><\/tr>
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Wet<\/td>5\u201380 mm<\/td>1,500\u20133,000 RPM<\/td>12\u201318<\/td>Slag processing, wet mining tailings<\/td>75\u201388%<\/td><\/tr>
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Key Operating Parameters<\/h2>
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Five parameters determine eddy current separator performance. Optimizing these based on your specific material stream is the difference between 70% and 95% recovery rates.<\/p>
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1. Rotor Speed (RPM)<\/h3>
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Higher rotor speed increases field alternation frequency and repulsive force \u2014 but only up to a point. Beyond the optimal RPM for a given particle size, performance plateaus or drops because particles receive too-brief field exposure. Typical operating range: 2,000\u20135,000 RPM<\/strong>. Start at 3,000 RPM and adjust based on recovery results. Fine particles need higher RPM; large aluminum cans separate well at lower speeds.<\/p>
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2. Belt Speed<\/h3>
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Belt speed controls three factors: material burden depth (faster = thinner layer), dwell time in the magnetic field (faster = less exposure), and particle trajectory after separation. Optimal belt speed creates a single-particle-thick layer<\/strong> without stacking. Typical range: 1.5\u20133.0 m\/s. Increase belt speed for high-throughput applications; decrease for fine-fraction recovery.<\/p>
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3. Splitter Position<\/h3>
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The adjustable divider between metal and non-metal collection bins. Moving the splitter closer to the belt increases metal purity but reduces recovery; moving it further away increases recovery but allows more non-metal contamination. Set the splitter position based on whether your priority is maximum recovery (recycling revenue) or maximum purity (downstream process requirement).<\/p>
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4. Feed Layer Uniformity<\/h3>
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The single most overlooked parameter. Stacked material blocks magnetic field access to lower layers, cutting recovery by 30\u201350%. Use a vibratory feeder to spread material into a uniform monolayer before it reaches the ECS head pulley. For wet or sticky material, install a pre-screening stage to remove fines that cause bridging.<\/p>
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5. Ferrous Pre-Removal<\/h3>
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Ferrous metals (steel, iron) must be removed before the ECS. Steel pieces attract to the magnetic rotor shell, wrapping around it and damaging the belt, reducing non-ferrous separation effectiveness, and causing costly downtime. Always install a magnetic separator<\/a> upstream \u2014 overband magnets, magnetic drums, or pulley magnets remove 99%+ of ferrous contamination.<\/p>
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Material Separation Performance<\/h2>
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Not all non-ferrous metals separate equally. The governing factor is the conductivity-to-density ratio (\u03c3\/\u03c1)<\/strong> \u2014 higher ratios produce stronger separation forces. Here is how common materials rank:<\/p>
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Material<\/th>Conductivity (MS\/m)<\/th>Density (kg\/m\u00b3)<\/th>\u03c3\/\u03c1 Ratio<\/th>ECS Separation<\/th><\/tr>
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Aluminum<\/td>37.7<\/td>2,700<\/td>14.0<\/td>Excellent \u2014 primary target metal<\/td><\/tr>
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Magnesium<\/td>22.6<\/td>1,740<\/td>13.0<\/td>Excellent<\/td><\/tr>
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Copper<\/td>59.6<\/td>8,960<\/td>6.7<\/td>Good \u2014 needs slower belt or higher RPM<\/td><\/tr>
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Brass<\/td>15.9<\/td>8,500<\/td>1.9<\/td>Moderate \u2014 larger pieces only<\/td><\/tr>
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Zinc<\/td>16.6<\/td>7,130<\/td>2.3<\/td>Moderate<\/td><\/tr>
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Lead<\/td>4.8<\/td>11,340<\/td>0.4<\/td>Poor \u2014 density too high<\/td><\/tr>
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Stainless Steel<\/td>1.4<\/td>7,900<\/td>0.2<\/td>Very poor \u2014 use sensor-based sorting<\/td><\/tr>
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This table explains why aluminum cans are the easiest material to recover with an ECS (highest \u03c3\/\u03c1 ratio), while stainless steel requires sensor-based sorting technologies instead.<\/p>
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Specifications Reference<\/h2>
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Energycle manufactures eddy current separators in working widths from 600 mm to 2,000 mm. Here are representative specifications across our range:<\/p>
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Model<\/th>Belt Width<\/th>Throughput<\/th>Motor Power<\/th>Rotor Diameter<\/th>Rotor Speed<\/th><\/tr>
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ECS-600<\/td>600 mm<\/td>1\u20133 t\/h<\/td>4 kW<\/td>\u00d8300 mm<\/td>Up to 4,000 RPM<\/td><\/tr>
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ECS-800<\/td>800 mm<\/td>2\u20135 t\/h<\/td>5.5 kW<\/td>\u00d8300 mm<\/td>Up to 4,000 RPM<\/td><\/tr>
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ECS-1000<\/td>1,000 mm<\/td>3\u20138 t\/h<\/td>7.5 kW<\/td>\u00d8350 mm<\/td>Up to 3,800 RPM<\/td><\/tr>
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ECS-1200<\/td>1,200 mm<\/td>5\u201312 t\/h<\/td>11 kW<\/td>\u00d8350 mm<\/td>Up to 3,800 RPM<\/td><\/tr>
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ECS-1500<\/td>1,500 mm<\/td>8\u201318 t\/h<\/td>15 kW<\/td>\u00d8400 mm<\/td>Up to 3,500 RPM<\/td><\/tr>
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ECS-2000<\/td>2,000 mm<\/td>12\u201325 t\/h<\/td>22 kW<\/td>\u00d8400 mm<\/td>Up to 3,500 RPM<\/td><\/tr>
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All models feature VFD (variable frequency drive) for rotor speed adjustment, NdFeB rare-earth magnets, replaceable non-magnetic shell, and adjustable splitter plate. Visit our eddy current separator product page<\/a> for full specifications and configuration options.<\/p>
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Industry Applications<\/h2>
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Eddy current separators serve every industry that needs to recover non-ferrous metals from mixed material streams:<\/p>
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Municipal Solid Waste (MSW) Recycling<\/h3>
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In materials recovery facilities (MRFs), ECS recovers aluminum cans and other non-ferrous metals after magnetic separation removes steel. A typical MRF processes 20\u201350 t\/h and recovers 95%+ of aluminum cans with a single ECS pass. The recovered aluminum generates $800\u2013$1,500\/ton revenue \u2014 often the highest-value stream in MSW recycling. See our complete MSW sorting machine<\/a> lineup.<\/p>
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Auto Shredder Residue (ASR)<\/h3>
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After end-of-life vehicles are shredded, the mixed output contains aluminum engine parts, copper wiring, brass fittings, and zinc die-castings among plastic and glass. Multi-stage ECS processing (coarse fraction + fine fraction) recovers 85\u201392% of non-ferrous metals from ASR, adding $50\u2013$120 per vehicle in recovered metal value.<\/p>
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Incineration Bottom Ash (IBA)<\/h3>
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Waste-to-energy plant bottom ash contains 5\u201312% non-ferrous metals by weight \u2014 primarily aluminum and copper. Processing IBA through screening, magnetic separation, and eccentric\/high-frequency ECS recovers metals worth \u20ac40\u2013\u20ac80 per ton of ash processed. This application requires fine-particle ECS capability (down to 5 mm) due to the granular nature of IBA.<\/p>
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Electronic Waste (WEEE)<\/h3>
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After shredding, e-waste contains copper, aluminum, brass, and precious metals mixed with plastic and circuit board fragments. ECS recovers the bulk non-ferrous metals; downstream sensor-based sorting or density separation further purifies the output. Typical recovery: 80\u201390% of aluminum and copper from shredded WEEE.<\/p>
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PET Bottle Recycling<\/h3>
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Aluminum closures and rings must be removed from PET flake streams to achieve food-grade purity. An ECS positioned after crushing and washing removes 98%+ of aluminum contamination, bringing metal content below the 50 ppm threshold required for bottle-to-bottle recycling. Learn more about achieving \u226450 ppm metal in recycled pellets<\/a>.<\/p>
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Construction & Demolition (C&D) Waste<\/h3>
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Demolition debris contains aluminum window frames, copper pipe and wire, brass fixtures, and other non-ferrous metals. After primary crushing and ferrous removal, ECS recovers these high-value metals from the mixed aggregate, wood, and concrete stream.<\/p>
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Where ECS Fits in a Recycling Line<\/h2>
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An eddy current separator never operates alone. Here is the typical position in a recycling line and the equipment it works alongside:<\/p>
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Typical processing sequence:<\/strong><\/p>
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  1. Size reduction<\/strong> \u2014 shredder or crusher breaks material to processable size<\/li>
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  2. Screening<\/strong> \u2014 trommel or vibrating screen separates material into size fractions<\/li>
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  3. Ferrous removal<\/strong> \u2014 magnetic separator<\/a> (overband, drum, or pulley) removes steel and iron<\/li>
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  4. Eddy current separation<\/strong> \u2014 ECS recovers non-ferrous metals from remaining stream<\/li>
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  5. Further sorting<\/strong> \u2014 sensor-based sorting, density separation, or manual QC for final purity<\/li>
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    For maximum recovery, many facilities use two ECS units in series: a concentric unit for the coarse fraction (>20 mm) and an eccentric or high-frequency unit for the fine fraction (5\u201320 mm). This dual-stage approach recovers 15\u201325% more non-ferrous metal than a single-pass system.<\/p>
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    5-Step Selection Framework<\/h2>
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    Use this framework when specifying an eddy current separator for your operation:<\/p>
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    Step 1: Characterize Your Feed Material<\/h3>
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    Identify the non-ferrous metals present (aluminum, copper, brass, zinc), their particle size distribution, percentage by weight in the feed, and moisture level. This determines whether you need a concentric, eccentric, or high-frequency ECS design and what recovery rate to expect.<\/p>
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    Step 2: Determine Required Throughput<\/h3>
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    Measure your feed rate in tons per hour. The ECS belt width must handle this volume while maintaining monolayer feed distribution. A 1,000 mm belt handles 3\u20138 t\/h depending on material bulk density; wider belts for higher throughput. Always size for peak capacity plus 20% margin.<\/p>
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    Step 3: Choose Rotor Configuration<\/h3>
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    Concentric rotor for particles >20 mm (standard applications). Eccentric rotor for particles 5\u201350 mm (fine fraction, IBA, WEEE). High-frequency rotor for particles 5\u201320 mm (maximum fine-particle recovery). If your feed contains both coarse and fine fractions, plan for two ECS units in series.<\/p>
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    Step 4: Verify Upstream Equipment<\/h3>
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    Confirm ferrous pre-removal is adequate (\u22640.5% ferrous in ECS feed). Verify screening\/sizing produces the correct size fraction for your ECS type. Ensure vibratory feeder or spreading conveyor is included for uniform monolayer distribution. Missing any upstream step significantly reduces ECS performance.<\/p>
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    Step 5: Calculate ROI<\/h3>
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    Estimate annual non-ferrous recovery tonnage \u00d7 metal value per ton = gross revenue. Subtract ECS operating costs (electricity, belt replacement every 12\u201318 months, rotor shell replacement every 3\u20135 years, maintenance labor). Most ECS installations achieve payback within 6\u201318 months based on recovered metal value alone \u2014 aluminum recovery at 95% rates generates $800\u2013$1,500\/ton revenue.<\/p>
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    Maintenance and Troubleshooting<\/h2>
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    Eddy current separators are relatively low-maintenance compared to other recycling equipment, but regular checks prevent costly downtime:<\/p>
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    Interval<\/th>Task<\/th>Details<\/th><\/tr>
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    Daily<\/td>Visual inspection<\/td>Check belt tracking, splitter position, and discharge areas for material buildup<\/td><\/tr>
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    Weekly<\/td>Belt tension check<\/td>Verify belt tension and alignment; misalignment causes uneven wear and reduced separation<\/td><\/tr>
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    Monthly<\/td>Bearing lubrication<\/td>Grease rotor and drive bearings per manufacturer schedule<\/td><\/tr>
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    Monthly<\/td>Shell inspection<\/td>Check non-magnetic shell for wear marks from ferrous contamination; replace if worn through<\/td><\/tr>
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    Quarterly<\/td>Magnetic field check<\/td>Verify rotor magnetic field strength with a gaussmeter \u2014 NdFeB magnets degrade <1% per year<\/td><\/tr>
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    Annually<\/td>Belt replacement<\/td>Replace conveyor belt; inspect drive components, rollers, and bearings<\/td><\/tr>
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    3\u20135 years<\/td>Shell replacement<\/td>Replace non-magnetic rotor shell (carbon fiber or stainless steel) when worn below minimum thickness<\/td><\/tr>
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    Common issues and solutions:<\/strong><\/p>
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