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Gases for Refining and Roasting in the Non-Ferrous
Metals Industry
Technologies include: removing contaminants with gases such
as oxygen, hydrogen, chlorine and sulphur hexafluoride (SF6);
using nitrogen or argon as inert carrier gases; stirring using
gases; oxygen-rich roasting atmospheres; and other industrial
gases applications. These offer significant financial benefits
for refining, degassing and roasting in the non-ferrous metals
industry.
Offerings applicable to refining and roasting.
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| Refining - Oxygen Injection |
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Oxygen is used via an oxidation process to remove sulphur
and other contaminants such as antimony and bismuth from copper,
lead, nickel or zinc. Using oxygen rather than air drives
the reaction faster, resulting in increased productivity.
Refining - Hydrogen Injection
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Hydrogen or hydrogen / nitrogen mixes can be used to remove
dissolved oxygen or to control the generation of metallic
oxides in many copper and nickel baths. This method brings
productivity and efficiency benefits.
Refining - Sulphur Hexafluoride Injection
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Injection of sulphur hexafluoride (SF6) or chlorine,
in an inert gas (nitrogen or argon), into molten aluminium
or copper removes hydrogen and other undesirable elements
that cause porosity, inclusions or pinholes in the final product.
Reducing hydrogen and alkali metal content, and promoting
flotation of oxides and non-metallic inclusions, produces
more consistent, higher quality metal. In addition, SF6
degassing eliminates the maintenance associated with other
degassing approaches that typically cause emission problems
and corrosion of equipment and plant structures.
Refining - Stirring
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Gas injection to stir molten metal improves homogeneity of
both alloy composition and temperature. This increases yield,
decreases alloy requirement, reduces production rejects and
produces a higher product quality and consistency.
Refining - Inerting
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Using nitrogen to displace the oxygen above a molten bath
reduces the formation of oxides at the melt surface providing
a higher yield and improved quality.
Roasting - Oxygen Enrichment
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| Oxygen is injected into zinc roasters to increase productivity,
reduce flue gas volume and increase sulphur dioxide concentration.
In addition oxygen has been shown to stabilise production when
the quality of the concentrate varies. |
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