Talk:Direct reduced iron

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Research Links[edit]

This is a quick list of links to more information about DRI technology. It would be awesome to find a clean steel making process that is energy efficient or at least uses a clean energy source (electric).

This article describes US Steel closure of coking plant saying natural gas will replace coke in ten years.http://www.thespec.com/news-story/4190319-u-s-steel-natural-gas-process-will-soon-replace-coke/ Some way to go though as World Steel Association statistics put DRI at 5-7% of Blast furnace iron. http://www.worldsteel.org/statistics/statistics-archive.html Vancouver2 (talk) 18:53, 7 June 2014 (UTC)[reply]

There is one, finally: direct reduction of iron with hydrogen; HYBRIT: hybritdevelopment.com C-Kobold (talk) 02:57, 19 November 2018 (UTC)[reply]

How to improve this article[edit]

As most of the articles dealing with the steel industry on the English Wikipedia, this article is mixing some topics. To clarify it, I propose to split this article in two distinct articles : one about the direct reduction processes and another about the direct reduced iron.

Many other wikipedias do it : French (where the article about the process is a featured article), Swedish. Other clearly make the distinction (Neederland, Ukrainian, etc.). Borvan53 (talk) 18:55, 2 October 2015 (UTC)[reply]

I agree. The inclusion of a historical section on the bloomery process is unhelpful. Though a precursor, this is not a direct antecedent of the current process. Peterkingiron (talk) 21:11, 9 February 2021 (UTC)[reply]

Process[edit]

Pure iron melts at 1536 C. 1200 is the melting point of cast iron (1150 to 1200). At low temperatures the reduced iron typically has a low carbon content, but the reduction is slow. At high temperatures the reaction is fasterbut iron reacts with carbon monoxide to form carbon dioxide and carbon dissolved in iron or iron carbides leading to the formation of cast iron and melting. In a blast furnace recuction takes place at intermediate levels ending with cast iron formation and melting at the bottom. In modern blast furnaces care is taken to avoid premature formation of cast iron since the reduction works better with a porous reactant charge and this requires less blast pressure, but at the end of the process the carbon content of the iron is so rapid that the formation of cast iron can't be avoided and the cast iron needs to undergo further processes to produce steel. In direct reduction the temperature is typically 800 to 1050 C (metallics.org.uk) to make the reduction fast enough and to avoid excessive carbon levels and melting. Energy and material considerations may also limit the maximum process temperature. — Preceding unsigned comment added by 150.227.15.253 (talk) 12:00, 3 August 2016 (UTC)[reply]

While much of this is true, it is in fact irrelevant, as this article is not about iron made in blast furnaces. Peterkingiron (talk) 21:14, 9 February 2021 (UTC)[reply]

Self contradiction in "Factors that help make DRI economical:"[edit]

First point: Direct-reduced iron has about the same iron content as pig iron, typically 90–94% total iron

Second last point: The DRI method produces 97% pure iron.

So which is it? 94% or 97%.

As an opinion, this whole article reads as an anti-fossil fuels sales pitch, rather than an encyclopedia article. — Preceding unsigned comment added by 2001:8003:e422:3c01:5884:4983:810c:981f (talk) 11:06, 18 December 2021 (UTC)[reply]

More self contradictions in "Benefits".[edit]

DRI plants need not be part of an integrated steel plant

yet, we then have

Hot direct reduced iron (HDRI) is DRI that is transported hot, directly from the reduction furnace, into an electric arc furnace, thereby saving energy.

Well, obviously, that can only happen if the DRI plant *IS* in fact "part of an integrated steel plant"

Again, this whole section reads like a sales pitch, rather than an encyclopaedic article. — Preceding unsigned comment added by 2001:8003:e422:3c01:5884:4983:810c:981f (talk) 11:10, 18 December 2021 (UTC)[reply]