Rautomead Limited

Rautomead Technology for

Precious Metals

Casting.

Rautomead Limited

Rautomead LimitedDundee Scotland

Founded 1978Sir Michael NairnChairmanBrian Frame MD appointed 2008

Employees = 50No Machines Sold = 360First 1978

Of these :-133 for Precious Metal production

Rautomead Limited

Rautomead – Head OfficeDundee, Scotland UK

Rautomead Limited

Rautomead – Head OfficeR&D casting facility + Spare Parts Stores

Rautomead Limited

Rautomead – Unit 7A Nobel Road FactoryMachine assembly & pre shipment testing

Rautomead Limited

Rautomead – Unit 7A Nobel Road FactoryMachine assembly & pre shipment testing

Rautomead Limited

Experts in Continuous Casting Technology• Rautomead are the ONLY supplier of continuous casting technology to

offer:

• UPWARDS casting for WIRE ROD

• UPWARDS casting for TUBE SHELL

• HORIZONTAL casting for BILLET

• HORIZONTAL casting for STRIP

• DOWNWARDS casting for SMALL HOLLOW

Rautomead Limited

Wire Rod Casting Technology

CuOF CuMg Brass

Enamelled wires Contact wires for EDM machining wireData cables high speed trainsTransformer strips

Rautomead Limited

5,000 – 10,000 Tonnes /year

Rautomead Limited

Bars & Billets for Foundry applications

Bronze Hollow Zinc BilletsBearings Automobile wheel weights

Rautomead Limited

RT

RMJ

RMT

RVS

PRECIOUS METALS CASTING TECHNOLOGY

Rautomead Limited

EXPERIENCE

• Rautomead have been supplying graphite furnace continuous casting systems for gold and silver production to MINTS around the world since 1985.

• More than 130 reference installations for Precious Metals casting• Machines originally supplied more than 25 years ago STILL IN

OPERATION

• Rautomead offer:– Reliable Operation & simple maintenance– Excellent Technical Support– High quality cast product– Technology with long operational life

• Many Mints have several Rautomead casting lines• Some Mints initially selected another equipment supplier, but

subsequently invested in Rautomead equipment.

Rautomead Limited

MINTSCustomers include Model

Shanghai Mint, China 2 x RMJ/H 025, 2 x RMT 150

Shenyang Mint China 1 x RMJ/H025Shandong Zhaojin China 2 x RMJ/H025Perth Mint, Australia 2 x RMJ/H 025, RMJ/H 005,

2 x RMT 200Sunshine Mint USA RT 400, RM050, 2 x RMT 200Royal Canadian Mint, Canada RMT 200, RMT 150 Royal Thai Mint, Thailand 2 x RMJ/H 025, Statna Mincovna, Slovavak Rep. RMJ/H 025Rand Refinery S. Africa RMT 100 SilverTowne Mint USA RMT200The Central Mint of China, Taiwan 2 x RMJ/H 005 1 x

RMJ/H025Royal Mint, UK 2 X RMT 150 Polish State Mint, Poland RMJ/H 005

Rautomead Limited

RT model – Silver Casting Installations

Customer Model Purpose YearLeach & Garner, USA RT 850 Extrusion Billet 2013

GSM Metals Inc. USA RT 650 Strip 2010

Sunshine Minting Inc, USA RT 650 Extrusion Billet 2008

Cimini & Associates, USA RT 850 Extrusion Billet 2008

Academy Precision Materials, USA RT 850 Strip 2006

Metalli Preziosi SpA, Italy RT 650 Strip 1993

Carrs of Sheffield Ltd, UK RT 650 Strip 1991

Rautomead Limited

RMT model – Silver Casting recent installations

Customer Model Purpose YearSilvertowne Mint, USA RMT 200 Strip 2013

Zhejiang Huangcheng, China RMT 200 Strip 2012

Shanghai Mint, China RMT 200 Strip and billet 2010

Perth Mint, Australia  RMT 200 Extrusion Billet 2009

Morvillo, USA RMT 200 Extrusion Billet 2007

Perth Mint, Australia RMT 100 Extrusion Billet 2007

Morvillo, USA  RMT 200 Strip 2006

Academy Precious Metals, China RMT 200 Strip 2006

Rautomead Limited

Rautomead Technology for

Continuous Casting Of Silver & Gold

Rautomead Limited

Continuous casting is the process whereby molten metal is solidified into a "semifinished" round, strip or shape in a continuous stream for subsequent finishing in downstream equipment.

Rautomead Limited

Critical Features for Silver & Gold casting:• Melting & casting in a GRAPHITE CRUCIBLE to deoxidise and avoid contamination

• Secure connection between casting die and crucible to avoid leakage

• Accurate temperature control of liquid metal, especially at the entry to the casting die

• Safe operation & Collection of metal in an external enclosed graphite mould in the event of spillage

• Accurate control of the withdrawal pulling sequence and casting speed to achieve best quality

• Ability to adjust and move the position and orientation of the withdrawal unit to exactly line up with the casting dieHigh Quality cast product is the requirement.Rautomead technology includes the above features to provide the CAPABILITY.

Rautomead Limited

FEATURES OF TECHNOLOGY

• Graphite Crucible• Graphite Heating System• Submerged Graphite Die• High Efficiency Copper

Coolers• Gas Bubbling

Accurate Melt Temperature ControlRemoval of oxygen from metalHigh purity metal processing without contamination.

Rautomead Limited

FEATURES OF TECHNOLOGY

• Graphite Crucible• Graphite Heating System• Submerged Graphite Die• High Efficiency Copper

Coolers• Gas Bubbling

Accurate Melt Temperature Control

Die heater concentrates heat atthe connection between die &crucible.

Minimise “superheat” of metal

Rautomead Limited

FEATURES OF TECHNOLOGY

• Graphite Crucible• Graphite Heating System• Submerged Graphite Die• High Efficiency Copper

Coolers• Gas Bubbling

Push fit connection between die & crucible

Die protected by nitrogen gas for long operation life.

Withdrawal unit position adjustable to accurately line up with casting die to

avoid leakage problem.

Rautomead Limited

FEATURES OF TECHNOLOGY

• Graphite Crucible• Graphite Heating System• Submerged Graphite Die• High Efficiency Copper

Coolers• Gas Bubbling

Rautomead design of copper alloy plate coolers for efficient and effective cooling of metal.

Rautomead Limited

FEATURES OF TECHNOLOGY

• Graphite Crucible• Graphite Heating System• Submerged Graphite Die• High Efficiency Copper

Coolers• Gas Bubbling

Option of nitrogen bubbling to assist with alloy mixing and deoxidation, if required.

Rautomead Limited

GRAPHITE TECHNOLOGY

• High Purity Material• No Contamination of the Melt• Naturally Reducing, removing oxygen from

liquid metal• High Thermal Conductivity• Good Machinability• Increasing Strength with Increasing Temperature

Rautomead Limited

RMJ/H025 - 1994 and 2011 Shanghai Mint, Gold strip production

Rautomead Limited

RMT 200 1994 & 2011 Shanghai Mint Silver strip (shear cutting) & silver billet (saw cutting)

Rautomead Limited

RT650 Casting Silver Strip

Strip up to 400mm wide

Crucible 600 kg Ag

Rautomead Limited

RT650 Casting Silver Billet

Billet up to 150 mm dia

Crucible up to 600 kg Ag

Output up to 300 kg/hr pure silver

Rautomead LimitedRautomead furnace interior design– “RCF” Free (Refractory Ceramic Fibre free) to comply with European health regulations) High efficiency thermal insulating materials Base for crucible can be seen, “Drain tube” to guide liquid metal to collection dump box also visible.

Rautomead Limited

GRAPHITE TECHNOLOGY

• Simple design of heating element, ease of exchange and possibility for local supply

• Die heater concentrates heat at the point where die joins the crucible• Elements surround the graphite crucible block

Rautomead Limited

Casting Die Assembly – for Strip 2 piece die design for ease of manufacture and refurbishment Multiple thermocouple to monitor die temp Copper alloy coolers tightened together using screws Nitrogen gas feed to protect die Hot end of die clamped with graphite clamp & graphite screws Insulation wool to create gas tight seal

Rautomead Limited

Casting Die Assembly – for Billet 2 piece die design for ease of manufacture and refurbishment Multiple thermocouple to monitor die temp Copper alloy cooler Nitrogen gas feed to protect die Feeder tube clamped with graphite screws Insulation wool to create gas tight seal

Rautomead Limited

Machine model capabilities (Figures are indicative only and for fine silver. Actual melting rate will be influenced by feedstock & material.)

Model Power (KVA)

Crucible Capacity (Litres)

OutputSolid Feed(Kg/hr)

StripWidth(mm)

BilletDia.(mm)

Tube Dia.(mm)

RMJ/H025 45 2 or 5.7 60Ag 125 35 35RMT100 75 18 or 22 100Ag 200 95 95RMT200 105 19 or 24 200 Ag 200 95 95RT650 150 59 or 70 300 Ag 400 150 150RT850 175 87 or 106 360 Ag 400 175 175Note: For fine Silver the retention time to deoxidise the silver should also be considered when selecting crucible size to output ratio of the machine. Feedstock type will have an impact on Oxygen Levels.

Rautomead Limited

Why choose Rautomead ?• Rautomead Equipment and technology will produce the highest quality

continuous cast product.

• Rautomead are an Experienced supplier with extensive established customer reference list of MINTS. The “equipment works”. Many customers return to buy second, third and more machines.

• The complete system is designed and supplied by Rautomead (furnace, controls, casting die, withdrawal system) as a comprehensive integrated system, assembled and tested at Rautomead before shipment.

• (some other suppliers “buy in” power systems & furnaces from “third party suppliers of melting systems” and attach their withdrawal pulling mechanism and die tooling to it).

• Rautomead have a local office representation to assist with communication and customer support.

• Rautomead provide customers with drawings of all consumable high temperature components (dies, elements etc) to give the option of local supply of future requirements.

Rautomead Limited

Thank You