Ferroalloy raw materials methodology

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The category business/processes/production/ferroalloy/rawmaterials is aimed towards industry professionals to enable them to prepare inventories of greenhouse gas emissions from ferroalloy production. Ferroalloy is the term used to describe concentrated alloys of iron and one or more metals such as silicon, manganese, chromium, molybdenum, vanadium and tungsten. Silicon metal production is usually included in the ferroalloy group because silicon metal production process is quite similar to the ferrosilicon process. Ferroalloy production involves a metallurgical reduction process that results in significant carbon dioxide emissions.

The methodology provided in this category represents the Tier 2 and Tier 3 approach described by the IPCC Guidelines for National Greenhouse Gas Inventories (NGGIP) and calculates on the basis of raw material inputs to the ferroalloy production process.

How to use this category

To use this category use the typeOfReducingAgent drill-down to select the reducing agent type being used from the following options:

  1. coal (for FeSi and Si-metal)
  2. coal (for other ferroalloys)
  3. coke (for FeMn and SiMn)
  4. coke (for Si and FeSi)
  5. coke (for other ferroalloys)
  6. prebaked electrodes
  7. electrode paste
  8. petroleum coke
The following profile item values are required in order to accurately calculate CO2 emissions:

  1. reducingAgentQuantity
  2. oreQuantity
  3. oreCarbonContent
  4. slagQuantity
  5. slagCarbonContent
  6. productQuantity
  7. productCarbonContent
  8. nonProductOutgoingStreamQuantity
  9. nonProductOutgoingStreamCarbonContent
The CO2 emission factor for the reducing agent has a default value provided but this can be over-ridden using the massCO2PerMassReducingAgent profile item value, by the user if more precise site or country-specific values are known.

For Tier 3 calculations the following profile item values can also be specified.

Use either:

  1. reducingAgentCarbonContent (decimal fraction, 0-1)
Or:
  1. percentageAsh: within reducing agent (decimal fraction, 0-1)
  2. percentageVolatiles: within reducing agent (decimal fraction, 0-1)
  3. carbonContentInVolatiles: within reducing agent (decimal fraction, 0-1)
Discover converts the carbon content of each source and product into CO2 emissions using molecular mass ratios, seen in Stoichiometries_ratios. This assumes complete combustion of carbon into CO2.

UIDLabel
KE2UH99S3J44 coal (for FeSi and Si-metal)
HEYARZ6MJNBF coal (for other ferroalloys)
HM9EOZPJIMPI coke (for FeMn and SiMn)
KTCMATUSZZ6J coke (for other ferroalloys)
MXCK2BFPW2AW coke (for Si and FeSi)
R587DE1K4EJB electrode paste
F981612X05XT petroleum coke
NFW8YRFTPMC9 prebaked electrodes
user-supplied value for the carbon content in non-product outgoing stream
user-supplied value for the carbon content in ore
user-supplied value for the carbon content in ferroalloy product
the carbon content in the reducing agent, only required for tier 3 calculation
user-supplied value for the carbon content in slag forming material
the percentage of ash, only required for tier 3 calculation
the percentage of volatiles, only required for tier 3 calculation
user-supplied value for the quantity of non-product outgoing stream
user-supplied value for the quantity of ore
user-supplied value for the quantity of ferroalloy produced
user-supplied value for the quantity of reducing agent used
user-supplied value for the quantity of slag forming material