{"id":31021,"date":"2026-08-09T13:09:25","date_gmt":"2026-08-09T13:09:25","guid":{"rendered":"https:\/\/doingcable.com\/?p=31021"},"modified":"2026-08-09T13:09:26","modified_gmt":"2026-08-09T13:09:26","slug":"what-is-a-copper-melting-furnace","status":"publish","type":"post","link":"https:\/\/doingcable.com\/tr\/what-is-a-copper-melting-furnace\/","title":{"rendered":"Bak\u0131r Eritme F\u0131r\u0131n\u0131 Nedir?"},"content":{"rendered":"

A copper melting furnace<\/strong> is an industrial electrothermal or fuel-fired system engineered to heat solid copper (cathodes, scrap, or alloys) to its melting point of 1083 \u00b0C and maintain a controlled molten bath typically at 1130\u20131250 \u00b0C for subsequent casting, continuous rod production, or alloying. In modern cable and conductor manufacturing, these furnaces supply high-purity molten copper (oxygen content often controlled below 10\u2013200 ppm depending on grade) that is continuously cast into wire rod or billets used for power cables, control cables, XLPE insulated conductors, and medium-\/high-voltage applications.<\/p>\n\n\n\n

\n
inquiry Now<\/a><\/div>\n<\/div>\n\n\n\n

Medium-frequency induction furnaces dominate secondary copper and cable-rod production because they deliver direct internal heating via electromagnetic induction, electromagnetic stirring for homogeneity, low metal loss, and precise temperature control (\u00b13\u20138 \u00b0C). Other configurations include shaft furnaces for high-throughput cathode melting feeding continuous casting & rolling (CCR) lines, channel induction furnaces for refining, crucible resistance or gas-fired units for smaller batches, and large-scale smelting furnaces (flash, ISASMELT, bottom-blown) for primary concentrate processing.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

How Does a Medium-Frequency Induction Copper Melting Furnace Work?<\/h3>\n\n\n\n

An alternating current (typically 150\u20133000 Hz, optimized for copper\u2019s low resistivity of ~1.7 \u03bc\u03a9\u00b7cm) passes through a water-cooled copper induction coil surrounding a refractory-lined crucible. The resulting alternating magnetic field induces eddy currents inside the copper charge. Joule heating (I\u00b2R) melts the metal from the inside out. Electromagnetic forces simultaneously stir the melt, promoting temperature uniformity and alloy homogeneity while minimizing oxidation when protective covers (charcoal or inert gas) are applied. IGBT-based power supplies achieve conversion efficiencies \u226595 % and power factors \u22650.95, delivering specific energy consumption of approximately 300\u2013450 kWh per ton of copper under optimized conditions.<\/p>\n\n\n\n

What Are the Main Types of Copper Melting Furnaces and Their Technical Comparison?<\/h3>\n\n\n\n

The selection depends on production volume, purity requirement, energy cost, and integration with downstream continuous casting or cable-rod lines.<\/p>\n\n\n\n

Kazan Tipi<\/th>Heating Principle<\/th>Tipik Kapasite<\/th>Melting Rate (Cu)<\/th>Specific Energy<\/th>Max Temp \/ Control<\/th>Best Application in Cable Industry<\/th>Key Limitations<\/th><\/tr><\/thead>
Medium-frequency coreless induction<\/td>Electromagnetic induction + eddy currents<\/td>50 kg \u2013 5 t<\/td>50\u20133500 kg\/h<\/td>300\u2013450 kWh\/t<\/td>1250\u20131350 \u00b0C \/ \u00b13\u20138 \u00b0C<\/td>High-purity ETP \/ OF copper for wire rod & conductors<\/td>Higher capital cost; lining life 150\u2013400 heats<\/td><\/tr>
Shaft furnace (gas\/oil)<\/td>Counter-current combustion<\/td>10\u201340 t\/h<\/td>14\u201316 t\/h typical<\/td>30\u201340 Nm\u00b3 NG\/t<\/td>~1200 \u00b0C<\/td>Continuous cathode melting feeding CCR lines<\/td>Requires fuel supply; higher oxidation risk<\/td><\/tr>
Channel induction<\/td>Induction via channel inductor<\/td>0.6\u201330 t<\/td>0.4\u20137 t\/h<\/td>Lower for holding<\/td>Precise holding<\/td>Refining + holding for continuous casting<\/td>Less flexible for frequent alloy changes<\/td><\/tr>
Crucible (resistance \/ gas)<\/td>External resistance or flame<\/td>15\u20131000 kg<\/td>Slower (hours)<\/td>Daha y\u00fcksek<\/td>Up to 1350 \u00b0C<\/td>Small-batch alloys, brass\/bronze for fittings<\/td>Lower efficiency; higher metal loss<\/td><\/tr>
Electric arc \/ primary smelting<\/td>Arc or flash\/oxygen bath<\/td>Large industrial<\/td>High throughput<\/td>Varies<\/td>\u00c7ok y\u00fcksek<\/td>Primary concentrate to blister copper<\/td>Not typical for secondary cable copper<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Induction units show clear advantages in energy efficiency, metal recovery (>98 %), and oxygen control critical for electrical conductivity (\u2265100\u2013101 % IACS).<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Technical Parameters and Performance Data for Industrial Copper Melting<\/h3>\n\n\n\n

Typical medium-frequency induction furnace specifications used in cable conductor production:<\/p>\n\n\n\n

Parametre<\/th>Small \/ Lab (5\u2013100 kg)<\/th>Medium (100\u20131000 kg)<\/th>Large \/ Industrial (1\u20135 t)<\/th><\/tr><\/thead>
Rated Power<\/td>15\u201375 kW<\/td>75\u2013750 kW<\/td>750\u20133500 kW<\/td><\/tr>
Operating Frequency<\/td>2000\u20138000 Hz<\/td>500\u20132500 Hz<\/td>150\u20131000 Hz<\/td><\/tr>
Melting Rate (pure Cu)<\/td>10\u201350 kg\/h<\/td>50\u2013350 kg\/h<\/td>350\u20133500 kg\/h<\/td><\/tr>
Specific Energy Consumption<\/td>420\u2013520 kWh\/t<\/td>400\u2013480 kWh\/t<\/td>380\u2013430 kWh\/t<\/td><\/tr>
Temperature Accuracy<\/td>\u00b18 \u00b0C<\/td>\u00b15 \u00b0C<\/td>\u00b13 \u00b0C<\/td><\/tr>
Lining Life<\/td>80\u2013200 heats<\/td>150\u2013350 heats<\/td>150\u2013400 heats<\/td><\/tr>
Power Factor<\/td>\u22650.93<\/td>\u22650.95<\/td>\u22650.95\u20130.96<\/td><\/tr>
Electrical Efficiency<\/td>90\u201393 %<\/td>93\u201395 %<\/td>94\u201397 %<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Melting point of pure copper is 1083 \u00b0C; pouring temperature for continuous casting is normally held at 1130\u20131200 \u00b0C. Oxygen-free copper (Cu-OF \/ Cu-OFE) production requires sealed or inert atmospheres and high-purity magnesia or alumina-magnesia linings.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Selection Logic and Application Guidelines for Cable Manufacturers<\/h3>\n\n\n\n

For power-cable and control-cable conductor production, prioritize:<\/p>\n\n\n\n