Three-Zone Vacuum Distillation Furnace

Product Overview

This three-zone vacuum distillation furnace is a specialized laboratory-scale system designed for the separation and purification of non-ferrous metals under high vacuum and controlled temperature gradients. The equipment features a vertical well-type furnace body with an automatic lid-lifting mechanism, allowing safe and convenient access to the hot zone for crucible loading and sample retrieval. The core innovation lies in its three independent heating zones: one for melting and vaporization, and two downstream zones for fractional condensation. This design enables highly efficient separation based on differences in vapor pressure, making it an indispensable tool for vacuum metallurgy research and small-scale recovery of valuable metals.

Primary applications include the purification of crude selenium to electronic-grade purity, recovery of tin and lead from solder scraps, processing of zinc residues from hot-dip galvanizing operations, and the separation of antimony from lead alloys. These processes are critical in the recycling industry, precious metals refining, and advanced materials science. With a compact footprint and lab-scale capacity of 1 kg, it is ideally suited for universities, research institutes, and pilot plants developing new vacuum distillation processes.

Engineered for demanding environments, this furnace incorporates high-grade ceramic fiber insulation and a robust stainless-steel vacuum chamber. The advanced temperature control system, featuring PID algorithms and S-type thermocouples, maintains precise temperatures within ±1°C across all zones. The high vacuum pumping system achieves an ultimate pressure in the 10⁻⁴ Pa range, minimizing oxidation and enabling low-temperature distillation. Whether used for fundamental research or process optimization, this furnace delivers consistent performance day after day.

Key Features

• Independent Three-Zone Temperature Control: The furnace is partitioned into one high-temperature distillation zone and two separately controlled condensation zones. Each zone is heated by its own resistive elements and regulated by independent PID controllers, allowing users to establish precise temperature profiles that promote efficient evaporation and selective condensation. This design significantly enhances separation factors for metals with similar boiling points.
• Exceptional Vacuum Performance: The system is equipped with a high-performance vacuum pumping unit (including rotary vane and diffusion pumps) that achieves a cold-state ultimate vacuum of 6.7×10⁻⁴ Pa after thorough bake-out. Such a high vacuum environment effectively lowers the boiling points of metals, reduces energy consumption, and prevents oxidation or contamination, resulting in high-purity products.
• Vertical Well-Type Lift Structure: The furnace lid is raised and lowered by a motorized lifting mechanism, providing unobstructed access to the crucible and furnace interior. This ergonomic design simplifies sample handling, minimizes the risk of thermal shock or breakage, and enhances overall operational safety during repeated cycles.
• High-Accuracy S-Type Thermocouples: Temperature measurement in the hot zones utilizes S-type thermocouples (platinum-rhodium) known for their excellent oxidation resistance and stability up to 1300°C. Combined with the PID controllers, they ensure long-term measurement accuracy and tight temperature regulation (±1°C).
• Intuitive Touchscreen PLC Control: All process parameters—temperature setpoints, vacuum levels, heating rates, and dwell times—are configured and monitored via a color touchscreen interface. The PLC stores multiple programs, enabling one-touch execution of complex, multi-step recipes and providing data logging for traceability and quality assurance.
• Robust and Safe Construction: Built with a heavy-gauge stainless steel 304 vacuum chamber and high-density ceramic fiber insulation, this furnace is designed for durability and low heat loss. Safety features include overtemperature protection, water-cooling interlocks for the diffusion pump, and pressure relief valves to ensure safe operation under all conditions.
• Controlled Atmosphere Capability: In addition to high-vacuum operation, the furnace can be backfilled with inert gases (e.g., argon or nitrogen) up to 0.05 MPa. This feature is beneficial when processing reactive metals or when a reducing environment is desired to shift chemical equilibria during distillation.
• Low Pressure Rise Rate: The vacuum integrity of the chamber is reflected in its pressure rise rate of ≤4 Pa/h, which indicates minimal outgassing and leakage. This ensures that the vacuum pumps are not overloaded during long runs, maintaining consistent vacuum levels for extended distillation experiments.

Applications

Technical Specifications

Why Choose This Product

• Proven Reliability in Harsh Environments: Engineered with industrial-grade components, this furnace has been validated in continuous operation for hundreds of cycles, demonstrating consistent heating performance and vacuum stability even in demanding research laboratories.
• Precision Manufacturing: The temperature control system achieves ±1°C accuracy across the entire operating range, while the high-quality vacuum chamber maintains a pressure rise rate below 4 Pa/h, ensuring that your process remains stable from run to run.
• Adaptable to Your Process: With independent zone control, adjustable gas filling, and customizable PLC programs, the furnace can be tailored to a wide variety of metals and alloys. We also offer optional upgrades such as larger crucibles, additional gas ports, or in-situ monitoring systems to meet specialized needs.
• Comprehensive Warranty and Support: All our equipment comes with a one-year warranty and lifetime technical support. Our engineers provide on-site installation and training, ensuring your team can make full use of the system from day one.
• Investment in Quality: Choosing this furnace means investing in a premium research tool that will deliver accurate, reproducible results for years. Contact us today to discuss how this system can accelerate your material recycling or purification projects, and request a detailed quotation tailored to your specifications.