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Home , Cupellation, Smelting

Furnaces for Precious

Ideal for & Assaying Furnaces for Precious Metals for Furnaces

Cupellation Furnace Furnace CF 24 SCF 4 Furnaces – for the assay of precious metals

Carbolite Gero cupellation furnaces are designed for testing using the cupellation, or assay test, method to ISO 11426:2014, a standard test method used to determine their purity.

The test method produces hazardous vapours. When used within a suitable fume management system, the cupellation furnaces are designed to handle the vapours without exposing the operator to these hazards. The design of the cupellation furnace range ensures protection from the corrosive environment which would damage a conventional furnace.

Standard features • Maximum operating temperature: 1200 °C • Variable airflow is preheated before entering the work chamber • Silicon carbide heating elements protected by silicon carbide tiles • Fumes are extracted through an insulated exhaust duct • Removable container collects condensed CF 24

Technical data

Maximum continuous Dimensions: Dimensions: Power supply Max operating Internal External Charge Charge Max temp temp H x W x D H x W x D capacity of capacity of power Thermocouple Ampere per Model (°C) (°C) (mm) (mm) no. 8 cupels no. 6 cupels (W) type Volt Phase phase

1050 x 950 x 1070 200 – 240 Single phase 68 (Bench-mounted) CF 15 1200 1200 125 x 215 x 270 15 24 9000 R 380 – 415 3 phase + N 23 225 x 600 x 380 200 – 240 3 phase delta 40 (Separate control module) 200 – 240 Single phase 87 2050 x 1000 x 1200 CF 24 1200 1200 200 x 250 x 340 24 32 13000 R 380 – 415 3 phase + N 28 (Floor-standing) 200 – 240 3 phase delta 50 380 – 415 3 phase + N 59 2230 x 1120 x 1435 CF 60 1200 1200 250 x 400 x 600 60 90 31000 R 200 – 240 3 phase delta 103 (Floor-standing) 440 3 phase + N 59

02 | Crucible Furnaces – for the smelting of precious

The Carbolite Gero range of robust top loading crucible furnaces are specifically designed for the smelting of SCF 4 precious metals and have gained in international reputation for close temperature uniformity, low heat loss and maximum fume control. Standard features

The furnaces are robustly constructed from heavy gauge hollow • Maximum operating temperature: 1400 °C section and coated sheet steel panels. Silicon carbide • Single or multiple crucible models heating elements surround the chamber sides and are protected • Silicon carbide heating elements protected by silicon by silicon carbide tiles. The hearth is constructed from carbide tiles bricks and silicon carbide tiles. The SCF 1 has a single chamber, • Silicon carbide tiles also protect insulation from fluxes all other models have twin chambers with separate lids.

Technical data

Dimensions excluding Dimensions: Dimensions: Max Max continuous handles: External Each chamber Control module Max temp operating temp H x W x D H x W x D H x W x D Charge Thermocouple power Model (°C) (°C) (mm) (mm) (mm) capacity type (W)

SCF 1 1400 1350 850 x 905 x 905 440 x 285 x 285 630 x 600 x 490 – R 15000

SCF 4 1400 1350 990 x 1230 x 1040 200 x 245 x 500 630 x 600 x 490 4 120 x 180 (OD x H mm) R 15000

SCF 8 1400 1350 1025 x 1350 x 1300 200 x 245 x 760 630 x 600 x 490 8 crucibles 120 x 180 (OD x H mm) R 21000

SCF 24 1400 1350 990 x 1230 x 1040 200 x 245 x 500 630 x 600 x 490 24 crucibles 79 x 97 (OD x H mm) R 15000

SCF 48 1400 1350 1025 x 1350 x 1300 200 x 245 x 760 630 x 600 x 490 48 crucibles 79 x 97 (OD x H mm) R 21000

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the content. the precious ascertain to treatment further to leading lead, the remove to used then low heat loss and maximum fume control. fume maximum and loss heat low uniformity, temperature close for a reputation have process this E1335 – 08. ASTM and the by 11426 ISO down with :2014 laid accordance in Convention method Hallmarking International reference a and Offices Assay UK the by used method standard the is cupellation by alloys gold of assay The calculated. be can weight by content gold the sample original the with compared is residue the of weight the When gold. of fine a residue leaving and silver the dissolving acid, nitric in boiled then is which behind left is bead silver and gold A pure . as metals base any and lead the absorbing cupels the in resulting 1100 to heated and cupels, as known blocks, porous on placed are samples wrapped The metals. base of removal the and gold of collection the with assist to silver of quantity pre-determined a with lead in wrapped and weighed accurately are samples small brick providing a solid hearth. a solid providing brick insulating hard-wearing with insulation the and elements the protect which tiles carbide silicon with lined are chambers furnace addition, provide to up to 1350 operation continuous allow which are fitted elements designed carbide silicon High-performance process. the by off specifically given gases are furnaces the while withstanding smelting, for required SCF temperatures the Gero’s Carbolite being present. operator an without automatically on switched be to equipment the allows switch time seven-day a24-hour and controller, microprocessor-based a three-term by regulated is temperature Furnace fumes. vent to chimneys incorporate also and operator the from away insulation face hot the keep lids chamber hinged The chambers. twin have four other customers’ different suit requirements. to models five includes range and sizes, various of crucibles ceramic in processed is Material The smallest model is a single-chamber unit, while the the while unit, asingle-chamber is model smallest The

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Subject to technical modifications and errors E-05-2016