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Re:Green steel without green hydrogen – can it work? by scythe on Tuesday February 15, 2022 @12:47PM (#30349966)
The key development that allowed this was the 2013 development of chromium anodes that tolerate the insane conditions of the process:

https://pubmed.ncbi.nlm.nih.gov/23657254/

So, that's why MOE wasn't around before 2013.

Re:Green steel without green hydrogen – can it work? by baybal2 on Tuesday February 15, 2022 @03:17PM (#30352044)
MOE wasn't, but colocating blast furnaces with steel converters is a very old idea.