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    Shaanxi Chengda Industrial Furnace Co., Ltd. completed the commissioning of electric arc furnace, the workers carefully cooperated with Chengda engineers to learn and operate the equipment, showing the deep friendship and excellent cooperation between the people of China and Pakistan.
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  • Shaanxi CHENGDA Industry Furnace MAKE Co., Ltd.
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    【 Warm congratulations 】 Shaanxi Chengda Industrial Furnace Manufacturing Company in South Korea, North Chungcheong County precious metal smelting furnace equipment installation and careful manufacturing and strict commissioning, looking forward to the future in more fields to achieve mutually beneficial win-win cooperation!
Contact Person : Du
Phone Number :  13991381852

Precious metal smelting electric furnace equipment

  • Precious metal smelting electric furnace equipment
Place of Origin Shaanxi, China
Brand Name Shaanxi Chengda
Certification ISO9001
Model Number Direct metal smelting equipment
Minimum Order Quantity 1set
Price Price and specific model specifications can be agreed upon.
Packaging Details Discuss according to the specific requirements of Party A
Delivery Time 2 months
Payment Terms L/C,D/A,D/P,T/T,Western Union,MoneyGram
Supply Ability Complete production supply chain, supply on time, and meet quality standards

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Product Details
Type Direct Metal Smelting Equipment Core Component Shelf Life 1year
Delivery Standard New Country Of Origin Shaanxi, China
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Product Description

 Precious metal smelting electric furnace equipment


  

Precious metal smelting electric furnace equipment is a specialized thermal processing system designed for extracting, purifying, and refining precious metals (e.g., gold, silver, platinum, palladium, rhodium) from raw ores, concentrates, secondary resources (such as scrap jewelry, electronic waste, and spent catalysts), or intermediate materials. Unlike traditional fuel-fired furnaces, it relies on electric energy to generate high temperatures, enabling precise control over smelting conditions—critical for the low abundance, high value, and complex separation requirements of precious metals.

Core Working Principles

The equipment operates on the principle of electric energy-to-thermal energy conversion, using different heating modes to reach the high temperatures (typically 1,100–1,800°C, depending on the metal and raw material) required for smelting. The key processes include:
  1. Raw Material Pretreatment: Raw materials are crushed, ground, screened, and often mixed with fluxes (e.g., silica, borax) and reducing agents (e.g., coke, charcoal). Fluxes lower the melting point of gangue (unwanted impurities) and form slag, while reducing agents convert metal oxides to elemental metals.
  2. Electric Heating & Melting: Electric energy is converted into heat to melt the mixed materials. The molten mixture separates into two phases:
    • Metal Phase: Precious metals (and associated base metals like copper or lead) form a dense molten alloy (matte or crude metal).
    • Slag Phase: Gangue, flux, and non-metallic impurities combine into a low-density, molten slag, which floats on top of the metal phase for easy separation.
  3. Separation & Post-Treatment: Slag is skimmed off, and the crude precious metal alloy undergoes further refining (e.g., electrolysis, chemical leaching) to remove base metals and achieve high purity (often 99.9%–99.999%).

Main Types & Key Characteristics

Different electric furnace types are selected based on raw material properties (e.g., particle size, metal content), scale of production, and target metals. The most common types are:
Furnace Type Heating Principle Key Features Typical Applications
Resistance Electric Furnace Heat generated by current passing through resistive heating elements (e.g., molybdenum disilicide, graphite) or the charge itself. Precise temperature control (±5°C), low noise, suitable for small-batch, high-purity smelting. Refining of gold/silver, small-scale processing of precious metal scraps.
Electric Arc Furnace (EAF) High-temperature electric arc formed between graphite electrodes and the charge generates heat. High heating capacity (up to 2,000°C), adaptable to large batches, can handle high-gangue ores. Smelting of precious metal concentrates, recovery from electronic waste (e-waste).
Induction Electric Furnace Electromagnetic induction creates eddy currents in the conductive charge, heating it internally. Fast heating rate, uniform temperature distribution, minimal slag formation. Refining of platinum-group metals (PGMs), production of high-purity precious metal ingots.
Plasma Arc Furnace Plasma torch (ionized gas) produces ultra-high temperatures (2,500–5,000°C) for heating. Handles refractory materials, efficient for complex ores or secondary resources with high impurities. Recovery of precious metals from spent catalysts, smelting of low-grade precious metal ores.

Key Equipment Components

A complete precious metal smelting electric furnace system integrates multiple functional modules to ensure efficiency, safety, and product quality:
  1. Furnace Body: The core structure, usually lined with high-temperature refractory materials (e.g., magnesia, alumina) to withstand corrosion and thermal shock. It has a charging port, slag tap, and metal tap.
  2. Power Supply System: Matched to the furnace type—e.g., low-voltage high-current transformers for EAFs, high-frequency power supplies for induction furnaces—to deliver stable electric energy.
  3. Electrode System (for arc/plasma furnaces): Graphite or tungsten electrodes that transmit current to generate arcs/plasma. Electrodes are adjustable to maintain stable heating.
  4. Flue Gas Treatment System: Captures and purifies toxic gases (e.g., SO₂, heavy metal vapors) and dust via cyclones, bag filters, and scrubbers—critical for environmental compliance and recovering fine precious metal particles.
  5. Control & Monitoring System: Real-time tracking of temperature, pressure, current, and voltage. Automated adjustments (e.g., electrode position, power input) ensure stable smelting and reduce human error.

Advantages for Precious Metal Smelting

Compared to fuel-fired furnaces, electric furnaces offer unique benefits tailored to precious metal processing:
  • Precise Temperature Control: Enables targeted melting of precious metals while minimizing loss to slag or vapor—vital for high-value metals where even 1% loss impacts profitability.
  • Low Environmental Impact: No combustion emissions (e.g., CO₂, NOₓ) from fuel, and flue gas is easier to treat. Reduces heavy metal pollution, aligning with strict environmental regulations.
  • High Metal Recovery Rate: Uniform heating and controllable slag composition maximize separation of precious metals from impurities, especially for low-grade ores or complex secondary resources.
  • Flexibility: Adaptable to diverse raw materials (ores, scraps, catalysts) and small-to-large production scales, from laboratory refining to industrial-scale smelting.
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dc furnace

electric arc furnace

metal smelter