1500℃ Fire Assay Muffle Furnace Covers Fusion And Cupellation Stages 82L Chamber

Most fire assay laboratories end up with two furnaces: a fusion furnace that runs 1000–1200℃ and a cupellation furnace that runs 900–950℃. That means two footprints, two power drops, two calibration schedules and two sets of heating elements to stock. This 1500℃ muffle furnace covers flux fusion, cupellation and scorification in the same 82 L chamber, because its rated temperature sits far above both working windows and its programmable controller stores a separate ramp-and-hold program for each stage.

• One furnace replaces the fusion furnace and the cupellation furnaceThe 1500℃ rating covers the 1000–1200℃ fusion window and the 900–950℃ cupellation window with margin on both ends, so a laboratory buys, installs and calibrates one unit instead of two, and no longer queues fusion work behind cupellation work at shift change.
• Touchscreen program memory for each stageFusion and cupellation programs are stored separately and recalled from the touchscreen, with the timer and alarm points set once per program. Operators stop re-tuning the controller between stages and the two stages stop drifting apart over a shift.
• 25 kW input at 460V three phase with a replaceable chamberThe heating power is sized to bring an 82 L cordierite-mullite chamber up to fusion temperature without a long ramp, the transformer feeds the eight silicon molybdenum rods at the low voltage and high current they need, and the chamber is an independent block that is replaced after flux spillage damage instead of scrapping the furnace.

• Litharge flux fusion of gold, silver and PGM ore samples
• Cupellation of lead buttons on bone ash or magnesia cupels
• Scorification and annealing in precious metal assays
• Sulphide and refractory ore roast preparation before fusion
• Laboratories scaling up from a single bench furnace to a full assay line

• One capital line, one calibration: a single thermocouple and controller to certify instead of two, which shortens the quality paperwork every assay season.
• One spare parts stock: the same MoSi₂ rod, thermocouple and door seal fit both stages, so the spares cabinet stops carrying two element types.
• No stage changeover queue: fusion in the morning and cupellation in the afternoon on the same unit, with the chamber already hot instead of waiting for a second furnace to ramp from cold.
• Room to grow: rated temperature leaves headroom for higher temperature roast work, so the unit is not outgrown when the assay scope widens.

Send three details and we reply with the chamber layout, the fusion program settings and a quotation instead of a generic price list:

• Ore type and daily sample count — sulphide, oxide or refractory ore, and how many crucibles you run per shift
• Crucible diameter and fusion program — we confirm how many crucibles the 295 x 485 x 575 mm chamber takes per load
• Site voltage, phase and compressed air — 460V three phase is standard, 380V and 220V options are built to order, and the pneumatic door needs a compressed air line at your bench

Send an inquiry with these three points and our engineer will confirm the configuration before you commit to an order.

• Export wooden case with shock blocking for the heating rods and refractory chamber
• English operation manual, wiring diagram and thermocouple calibration certificate supplied
• Spare MoSi₂ rods, S-type thermocouples, chamber blocks and door seals available separately