Multi-Electrode DC Submerged Arc Furnace 6300KVA High Capacity for Vanadium-Titanium Magnetite Slag Smelting ISO 9001

Multi-Electrode DC Submerged Arc Furnace for Vanadium-Titanium Magnetite Comprehensive Smelting

This Multi-Electrode DC Submerged Arc Furnace is a specialized high-temperature smelting solution engineered for comprehensive resource utilization of vanadium-titanium magnetite. By combining advanced multi-electrode DC submerged arc technology with precise slag chemistry control, it achieves simultaneous recovery of vanadium and iron while producing high-grade titanium slag as a valuable by-product, maximizing the economic value of every ton of raw material processed.

Core Working Principle

The furnace operates as a DC submerged arc resistance furnace with three graphite electrodes submerged in the slag layer. The electric current passes through the slag, generating resistance heat that maintains a stable smelting temperature of 1550-1750°C. Vanadium-titanium magnetite concentrate is continuously fed and undergoes carbothermic reduction: iron oxides are reduced to molten iron, vanadium oxides are reduced and enriched in the iron phase, while titanium oxides concentrate in the slag phase. The multi-electrode configuration ensures uniform heat distribution throughout the submerged arc zone, eliminating cold zones and maximizing reduction efficiency.

Key Technical Advantages

Multi-Electrode DC Submerged Arc Technology

• Triple Electrode Submerged Operation: Three Φ500-600mm graphite electrodes operate fully submerged in the slag layer, providing stable resistance heating with 30% higher thermal efficiency than open arc furnaces.
• Arc-Free Smelting Zone: Submerged operation eliminates arc-related refractory erosion, extending furnace lining service life to 500-800 heats.
• Superior Slag Bath Stirring: Multi-electrode DC current distribution generates strong electromagnetic stirring within the slag bath, ensuring uniform temperature (±5°C) and composition throughout the melt.
• Reduced Electrode Consumption: Submerged operation protects electrodes from oxidation, reducing graphite consumption by 40-50% compared to open arc furnaces.

Comprehensive Resource Recovery

• Vanadium Recovery Rate ≥88%: Optimized slag basicity (CaO/SiO₂ 1.3-1.8) and deep reduction conditions maximize vanadium transfer to the iron phase.
• Iron Recovery Rate ≥98%: Near-complete iron oxide reduction produces high-quality vanadium-containing hot metal suitable for downstream steelmaking.
• High-Grade Titanium Slag (TiO₂ ≥45%): Controlled smelting conditions concentrate titanium oxides in the slag phase, producing a saleable by-product for titanium dioxide production or chlorination processes.
• Zero Waste Philosophy: All output streams (V-bearing iron, Ti-rich slag, off-gas) are valorized, achieving comprehensive resource utilization.

Precise Slag Chemistry Control

• Real-Time Basicity Adjustment: Automated lime and silica feeding system maintains optimal CaO/SiO₂ ratio (1.3-1.8) for maximum vanadium partitioning to iron phase while ensuring good slag fluidity.
• MgO Saturation Control: Controlled MgO addition to saturation level protects magnesia-carbon refractory lining from chemical attack, extending lining life.
• TiO₂ Activity Management: Slag TiO₂ content maintained at 35-50% to prevent titanium carbide/carbonitride formation that increases slag viscosity and metal entrapment.

Energy Efficiency & Environmental Performance

• Power Factor ≥0.95: DC rectifier system with high natural power factor eliminates need for reactive power compensation equipment.
• Waste Heat Recovery: Off-gas at 800-1000°C passes through waste heat boiler, generating steam for onsite power generation or process heating.
• Closed Flue Gas System: Fully enclosed furnace hood with bag filter, desulfurization, and denitrification meeting EU BAT (Best Available Techniques) emission standards.
• Water Recycling: Closed-loop cooling water system with 95%+ water recycling rate, minimizing freshwater consumption.

Intelligent Process Control

• DCS Integrated Control: Distributed Control System with redundant PLC controllers for furnace power, electrode position, feeding rate, and slag chemistry management.
• Real-Time Slag Analysis: XRF-based online slag composition monitoring with automatic flux adjustment to maintain target chemistry.
• Predictive Maintenance: AI-driven equipment health monitoring analyzing vibration, temperature, and current patterns to predict maintenance needs before failures occur.
• Remote Operation Capability: Secure VPN-based remote monitoring and control enables expert support from any location worldwide.

Equipment Structure

Technical Parameters

Application Scope

• Vanadium-titanium magnetite concentrate comprehensive smelting
• Sea sand vanadium-titanium magnetite processing
• Vanadium-bearing titaniferous iron ore reduction and separation
• Titanium slag production for chloride-process TiO₂ manufacturing
• Comprehensive utilization of complex polymetallic iron ores
• Metallurgical solid waste valorization with V-Ti-Fe content

After-Sales Service

• 1-year comprehensive warranty on all core components
• Professional engineering team for turnkey installation, cold/hot commissioning, and operator training
• 24/7 remote technical support with video-assisted troubleshooting
• Global spare parts logistics with critical spares consignment stock available
• Annual furnace inspection and preventive maintenance service contracts
• Process optimization consulting for throughput and recovery rate improvement

Contact us today for a customized engineering proposal including mass and energy balance, equipment layout, and detailed quotation tailored to your vanadium-titanium magnetite processing requirements.