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The furnace body undergoes numerical control machining with anti-corrosion spraying. It features an air-cooled double-layer structure, with the outer shell temperature ≤ 45℃. The furnace lining is made of high-purity alumina lightweight material. Equipped with silicon carbide rods for heating on both sides and a Pt-Rh S thermocouple for temperature measurement, it supports rapid heating at 30℃/min. The electrically and pneumatically operated top-opening furnace door is equipped with foot pedal control. It comes with 310S stainless steel sampling tongs, a furnace loading cart, and cast iron sample melting molds, ensuring convenient and safe operation.
Applications of the fire assay electric furnace: Fire assay is a part of exploration geochemistry. Exploration geochemistry (EG) uses chemical principles for mineral exploration. Its purpose is to use chemical methods to assist in determining the geographical location of sedimentary deposits and the extension range of the discovered deposits. EG involves the analysis of the following samples: core samples, rocks, sediments, soil, glacial debris, or vegetation, etc.
Serial Number | Item | Name | Specification Model | Unit | Quantity |
1 | Fire Assay Furnace | Furnace Main Body | GWL-1400LBFS50P | Set | 2 |
2 | Sampling Tongs | 50P | Set | 2 | |
3 | Sampling Cart | 50P | Set | 2 | |
4 | Furnace Loading Cart | 15500 | Set | 2 | |
5 | Steel Platform | 1.5 square meters | Set | 2 | |
6 | Melting Mold | 50P | Piece | 100 | |
7 | Melting Crucible | D92-140/135 | Piece | 1000 | |
8 | Furnace Dust Collector | Dust Collector | GWDL-1500/3KW-44-SUS304 | Set | 1 |
9 | Dust Collection Hood | For 2 fire assay furnaces + 1 ash furnace- | Set | 1 | |
10 | Dust Collection Pipeline | Set | 1 | ||
11 | Ash Furnace | Ash Furnace | GWL-1400LB300/300/200 | Set | 1 |
| Parameter Name | Technical Performance Requirements |
| Rated Temperature | 1200°C (maximum 1300°C) |
| Rated Voltage | 3 x 380V (heating circuit), 220V (control circuit) |
| Rated Current | 3 x 40A |
| Rated Power | 27kW (output power adjustable) |
| Power Supply Mode | Three-phase five-wire system (Party B provides signal lines) |
| Overall Weight | 900kg |
| Installation and Fixing Method | Foma wheels are used for movement and support during transportation and single-machine debugging; after on-site positioning, the equipment is supported by foot cups and fixed to the ground with expansion bolts. |
| Furnace Working Size | 570mm x 300mm x 310mm (depth x width x height), tolerance ±10mm |
| Overall Dimensions | 1500mm x 1200mm x 1700mm (length x width x height), tolerance ±20mm |
| Smoke Collection Hood | Equipped with a smoke collection hood to collect smelting fumes at the furnace door; the hood and furnace body have a detachable structure, made of 304 stainless steel. |
| Exhaust Requirements | Collect fumes from the hood and the furnace body, and discharge them to the workshop's main smoke collection pipeline through a single interface; equipped with a 304 stainless steel exhaust hand valve; position and interface size as shown in the assembly drawing. |
| Exhaust Volume | 330Nm³/h |
| Exhaust Temperature | Based on the higher heating temperature |
| Air Intake Volume | 330Nm³/h |
| Air Intake Channels | 4 in total (2 on left and 2 on right); air inlets are equipped with filters, made of 304 stainless steel |
| Temperature Measuring Element | Platinum-rhodium S thermocouple, measuring range 0-1600°C |
| Heating Elements | D16 equal-diameter U-type silicon carbide rods |
| Furnace Temperature Uniformity | 1) Multi-point control (2 points for temperature control, 1 point for temperature measurement) |
| 2) Furnace temperature uniformity ±5°C (error between measurements of 3 thermocouples) | |
| 3) Furnace chamber temperature drop < 100°C when the door is opened | |
| Temperature Control Precision | ±1°C (error between set temperature and measurements of 2 temperature-control thermocouples when reaching the set temperature) |
| Constant Temperature Precision | ±1°C (error between set temperature and measurements of 2 temperature-control thermocouples during constant temperature) |
| Heating Rate | Adjustable, range 1-900°C/h |
| Furnace Body Structure | Air-cooled double-layer furnace structure; effective air-cooled guide partitions enable overall cold air circulation in the furnace shell, which cools the conductive sheets of heating elements before being discharged, avoiding high-temperature oxidation of conductive sheets. |
| Furnace Lining Requirements | Made of vacuum-formed high-purity alumina lightweight materials; easily collision and load-bearing positions (furnace mouth, furnace bottom) use lightweight hollow sphere alumina plates, featuring high operating temperature, low heat storage, resistance to rapid heating/cooling, no cracks, no slag dropping, and good insulation. |
| Insulation Requirements | Three-layer insulation: aluminosilicate fiberboard, alumina fiberboard, and alumina (polycrystalline) fiberboard |
| Furnace Door Opening Method | Top-opening door, controlled by cylinder for opening/closing, compatible with automatic and manual control; equipped with operating handle or foot switch for manual door opening during debugging or failure; the door remains in its state during unexpected gas/electricity failure without falling. |
| Furnace Shell Temperature | Surface temperature of the furnace body does not exceed 45°C during long-term continuous operation |
| System Protection | Designed with dual-loop control and protection, featuring overshoot, undershoot, thermocouple break, phase loss, overvoltage, overcurrent, overtemperature, current feedback, and soft start protection. |
| Electrical Control Box | The control box is located under the furnace body for easy installation and maintenance; equipped with radiators and high-temperature protection to prevent electrical failures caused by excessive temperature; reserved with furnace door lifting signal lines and upper PLC connection; temperature control instrument with RS485 communication. |
| Control Panel | 1) Equipped with an intelligent temperature regulator, control power switch, main heating start/stop buttons, voltage/current meters, and computer interface. |
| 2) Equipped with a 7-inch touchscreen for centralized control, displaying real-time temperature, temperature segment number, segment time, remaining time, output power percentage, voltage, and current. | |
| Communication Interface | Provided with RS485 communication interface, enabling computer control for starting, pausing, stopping, setting heating curves, reading heating curves, and parameter adjustment; high reliability and easy operation. The computer display shows rich content, including measured value, set value, output value, segment time, segment number, heating curve, and power percentage curve. Heating curves can be stored in the computer, called arbitrarily, and modified. Historical curves and reports can be saved for a long time with selectable time intervals (1s-1h). |
| Ash Blowing Observation Window | 1) The observation window is located on the automatically opening furnace door, size 50x80mm. |
| 2) Structure from inside to outside: stainless steel mirror panel + double-layer heat-insulating glass + camera bracket + dual cooling fans. | |
| 3) Heat-insulating glass is easily detachable for replacement due to damage or contamination. | |
| 4) The stainless steel mirror panel is closed by default and opens automatically when observation is needed; the camera observes the furnace interior through double-layer heat-insulating glass. | |
| 5) Air cooling is used between the double-layer heat-insulating glass and the camera to reduce heat radiation temperature, ensuring the camera works below 70°C. | |
| Ash Blowing Method | Ash blowing without opening the door; internal ventilation and oxygen supply pipeline with an air inlet at the lower part of the furnace back; a high-pressure fan with a flow control valve is used to control air intake and adjust ash blowing speed. |
