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UK, iron and steel production
Process
Raw materials consisting of sinter, iron ore and coke are fed into the top of the blast furnace and pre-heated air is blown in around the base. Melting and chemical reduction occur within a shaft of the blast furnace. Liquid iron is removed at the base together with slag, whilst the off gases pass out the top of the furnace to be cleaned and used as a fuel. Some iron ore has suitable properties to be used directly in the blast furnace, but much of it is too fine, and has to be sintered prior to use.
The sintering process
Mixture of iron ore and small amount of coke --> onto moving grate --> ignition. Temperature in the combustion zone is ~1200 degrees, material partly melts and forms agglomerates. At the end of the grate - breaker --> cooler --> sinter produced has a large particle size, acceptable in the blast furnace. "Off" gases cleaned by electrostatic precipitators. At the point of emission the dust content is typically 60 mg/m3 (all dust <10 microns).
Radioactivity
Average U decay products 0.015 Bq/g. Sintering process - Pb-210 & Po-210 volatilised and concentrated in the off gas. Po-210 70 Bq/g, Pb-210 15 Bq/g - in the dust.
Authorisation for these emissions is required as the values are above "emission limit without authorisation" in the UK Radioactive Substances Act
Doses to the public ~ 1-2 microSv/year, highest - 18.5 microSv/year
Products & wastes from the stages of the production further downstream in the process were examined and have failed to show any enhanced concentrations of radionuclides
In blast furnace off gas dust: Po-210 2.8 Bq/g, Pb-210 8.0 Bq/g - these are below the "disposal limit without authorisation" from the UK Radioactive Substances Act