In the pursuit of more efficient and sustainable industrial production, smelting technology plays a pivotal role. As the core equipment in this process, the performance of smelting furnaces directly impacts production costs, energy consumption, and the quality of final products. With decades of technical expertise and innovation in smelting, Tanabe Corporation has emerged as a leader in industrial smelting through its advanced electric furnace technology.

Smelting Furnaces: The Heart of Industrial Production

A smelting furnace is an industrial device that uses high-temperature heat sources to melt materials. Depending on the heat source, these furnaces can be categorized into resistance furnaces, plasma furnaces, and combustion furnaces. Tanabe Corporation offers various types, with resistance furnaces being particularly favored for their versatility and adjustable processing capacity. While plasma and combustion furnaces excel in specific applications, resistance furnaces provide more comprehensive solutions across diverse industrial needs.

The Distinct Advantages of Electric Smelting Furnaces

Tanabe Corporation's electric furnaces, particularly resistance furnaces, offer several notable features:

• Exceptional thermal efficiency: Electrodes embedded directly in raw materials or slag generate Joule heat through electric current, enabling efficient heating and melting.
• Quiet operation: The submerged arc electrode design eliminates open arcs, significantly reducing operational noise compared to traditional arc furnaces.
• Energy-saving design: A raw material covering layer on the slag surface minimizes radiant heat loss to refractory materials and reduces exhaust heat loss.
• Easy recovery: The natural separation of slag and metal by density difference facilitates subsequent processing.
• Environmental benefits: Reduced exhaust gas generation simplifies treatment processes and decreases the size of required environmental equipment.
• System reliability: Decades of technical expertise enable Tanabe to deliver highly reliable smelting systems with efficient power supply solutions.

Working Principles and Structural Mechanisms

Smelting furnaces operate through three primary heating methods:

Resistance Smelting Furnaces

Tanabe's resistance furnaces include submerged arc furnaces (SAF) and direct resistance furnaces. In SAF models, electrodes immerse in raw materials or slag, using Joule heat to make the heated material itself the heat source.

Plasma Smelting Furnaces

The company's DC arc plasma furnaces primarily process municipal waste incineration ash. Plasma torches generate ultra-high-temperature jets (20,000-30,000°C) to melt materials at near-atmospheric pressure.

Combustion Smelting Furnaces

Surface reflection furnaces use burner heat and wall radiation to melt materials. Specially designed diffuser-flame burners enhance surface melting efficiency based on processing volume.

Applications Across Industries

Tanabe's furnaces serve multiple industrial processes:

• Reduction reactions: For manufacturing calcium carbide, ferroalloys, and precious metal recovery.
• Volume reduction: Processing municipal waste incineration ash.
• Detoxification: Immobilizing heavy metals in slag to reduce toxic leaching.
• Melting processes: For rock wool production and similar applications.
• Gravity separation: Separating slag and metal by density difference.

Product Portfolio and Auxiliary Systems

The company offers specialized furnaces for:

• Calcium carbide production (operating at ~2000°C)
• Ferroalloy manufacturing (closed and semi-closed types)
• Precious metal recovery from industrial byproducts
• Municipal waste treatment (resistance, plasma, or combustion models)
• Rock wool production (hot-charge and cold-charge methods)
• Copper slag processing for metal recovery

Comprehensive auxiliary systems include power supply units, electrode handling devices, tapping systems, and slag cooling equipment, all designed for optimal integration.

Implementation and Testing Protocols

Tanabe follows a rigorous implementation process:

1. Specification review and estimation (including verification tests for new materials)
2. Equipment specification and cost proposal
3. Design and manufacturing upon order confirmation
4. On-site installation and trial operation

Verification testing confirms melting characteristics, reduction states (where applicable), and slag resistivity values crucial for furnace design. The company maintains demonstration test equipment currently undergoing upgrades.

After-Sales Support and Maintenance

Post-delivery services include:

• Scheduled maintenance during client downtime
• Consumable and spare parts supply
• Retrofitting services for capacity enhancement

Technical Specifications and Operational Considerations

Key operational aspects include:

• Maximum furnace dimensions: 12.6m diameter × 5.6m depth (ferroalloy production)
• Peak operating temperature: ~2000°C (calcium carbide production)
• Refractory lining with water-cooled steel shells maintains structural integrity
• Material handling via tapping holes at different heights for selective slag/metal removal

The company emphasizes that moisture-containing materials accelerate electrode and refractory wear, while proper slag composition is essential for resistance furnace operation.