Fusion of Iron Ore & Furnace Dust
(adapted from The Socachim Handbook of Fusion Methods)

For Phoenix Fusion Machines

Introduction

A fusion method for materials such as: Iron Ore (Fe: 30-35%)

Materials

Flux XRF Scientific LT100, LT66:LM34 and LT50:LM50
Flux additives
Oxidizer Mix Lithium nitrate
Non-wetting agent Lithium Bromide (250g/L)

Method

1. Weigh 1 gram of dried/grinded samples, 10g of lithium borate flux, 1 grams of oxidizer and mix them together
2. Ensure mixture is rigorously mixed to achieve optimal contact between the sample and flux
3. Transfer the mixture into the crucible on the fusion machine and add about 4 drops of lithium bromide on top
4. Start the fusion program, as given below
5. Once cooling has finished, remove the bead from the mould

Comments

Direct fusion of iron ores in molten borate flux is not possible.
All iron should be oxidized at their higher oxidation state and this for two major reasons:
1. Iron is not soluble in borate flux
2. Metallic iron will react with the platinum-gold crucible causing the rapid destruction of this expensive material.
An oxidation step is therefore necessary and the fusion should be conducted in an oxidizing atmosphere. We therefore strongly suggest proceeding with an oxidation step followed by a fusion in oxidizing condition. This could be achieved by adding oxidizer such nitrate: lithium, potassium, sodium or strontium.

Fusion Program

Premelt 850°C 3 minutes
Melting, without swirling, 1150°C-1200°C# 1 minute
Melting, with swirling, 1150°C-1200°C# 4 minutes
Mould control (mould preheating step), 1100°C 2 minutes
Cooling (bi-level) Temperature 1 1 minute
Cooling (bi-level) Temperature 2 2 minutes