Recycling and reusing iron-containing waste materials generated in industrial production can expand iron ore resources, reduce pig iron costs, and reduce solid waste emissions, making it a core aspect of the circular economy in the steel industry.<\/p>\n\n\n\n
Currently, the main recyclable materials include: blast furnace dust, converter dust (steelmaking dust and sludge), rolling mill scale, iron filings, sulfuric acid slag, converter steel slag, and high-iron tailings of non-ferrous metals.<\/p>\n\n\n\n
\u2160,Characteristics of Various Iron-Containing Materials and Their Application in Blast Furnaces<\/em><\/strong><\/p>\n\n\n\n Source: By-product recovered from the blast furnace gas dust removal system, composed of ore and coke powder.<\/p>\n\n\n\n Production:<\/strong> 30-50 kg per ton of pig iron 2,Converter Dust (Steelmaking Dust\/OG Sludge)<\/strong> 3,Steel Rolling Scale (Iron Oxide Scale)<\/strong><\/p>\n\n\n\n Source: Iron oxide scale that peels off the surface of hot steel billets during the rolling process, accounting for 2%~3% of steel production. Source: Turning and forging waste from iron casting machines and machining. Source: Residue from the roasting of pyrite to produce sulfuric acid in chemical plants<\/p>\n\n\n\n Composition: TFe\u224850%, mainly Fe\u2082O\u2083; high sulfur content (1%~2%), and contains non-ferrous metals such as Cu, Pb, Zn, and Co, as well as precious metals such as Au and Ag.<\/p>\n\n\n\n Characteristics: Extremely fine particle size, <0.1mm is the majority.<\/p>\n\n\n\n Applications: – For slag with higher iron content: Agglomerated and fed into the blast furnace; added at 3%~5% in sintering batches (sulfur content must be strictly controlled).<\/p>\n\n\n\n Pelletizing process: Chlorinating agent is added, and valuable metals such as Cu, Pb, and Zn are recovered through high-temperature volatilization; the pellets are then fed back into the furnace.<\/p>\n\n\n\n For slag with lower iron content: Used as a raw material in cement production.<\/p>\n\n\n\n Source: Slag produced by oxygen converter steelmaking or open-hearth steelmaking<\/p>\n\n\n\n Composition: TFe\u224816%, containing a large amount of alkaline oxides CaO and MgO, with low-melting-point minerals<\/p>\n\n\n\n Characteristics: Recoverable iron, can replace some limestone and dolomite as flux; disadvantage is high phosphorus content<\/p>\n\n\n\n Applications: Sintering batching, can reduce sintering temperature, increase sinter strength, and reduce costs; the amount added should not be too high to avoid excessive phosphorus content in pig iron<\/p>\n\n\n\n \u2161,Latest Industry Developments and Precautions in 2026<\/em><\/mark><\/strong><\/p>\n\n\n\n Strictly control the sulfur content of sulfuric acid slag and the phosphorus content of steel slag to prevent excessive pig iron quality. <\/p>\n","protected":false},"excerpt":{"rendered":" Recycling and reusing iron-containing waste materials generated in industrial production can expand iron ore resources, reduce pig iron costs, and reduce solid waste emissions, making it a core aspect of the circular economy in the steel industry.<\/p>\n","protected":false},"author":1,"featured_media":2799,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-2798","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/luzixinzuonew.han-light.com\/index.php\/wp-json\/wp\/v2\/posts\/2798","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/luzixinzuonew.han-light.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/luzixinzuonew.han-light.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/luzixinzuonew.han-light.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/luzixinzuonew.han-light.com\/index.php\/wp-json\/wp\/v2\/comments?post=2798"}],"version-history":[{"count":0,"href":"https:\/\/luzixinzuonew.han-light.com\/index.php\/wp-json\/wp\/v2\/posts\/2798\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/luzixinzuonew.han-light.com\/index.php\/wp-json\/wp\/v2\/media\/2799"}],"wp:attachment":[{"href":"https:\/\/luzixinzuonew.han-light.com\/index.php\/wp-json\/wp\/v2\/media?parent=2798"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/luzixinzuonew.han-light.com\/index.php\/wp-json\/wp\/v2\/categories?post=2798"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/luzixinzuonew.han-light.com\/index.php\/wp-json\/wp\/v2\/tags?post=2798"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n
Composition: TFe \u2248 40%, carbon 10%-20%, high CaO content
Characteristics: Fine particle size, poor hydrophilicity
Applications: Sintering feedstock; can replace some iron ore powder and fuel, reducing costs; addition amount 3%-5%<\/p>\n\n\n\n
Source: Iron-containing powder recovered from oxygen converter flue gas dust collectors
Production: 20-25 kg per ton of steel
Composition: TFe 50%-60% or more, mainly Fe\u2083O\u2084, containing 16%-30% metallic iron
Characteristics: Extremely fine particle size
Applications: Auxiliary raw material for sintering or pelletizing; a high-quality iron-containing resource<\/p>\n\n\n\n
Composition: 60%~70% TFe, mainly Fe\u2083O\u2084, containing a small amount of metallic iron, and very few SiO\u2082 and Al\u2082O\u2083 impurities.
Characteristics: Flake-like, extremely high iron content.
Application: Used in sintering batching to steadily improve the grade of sintered ore; large impurities must be screened out before use, and the particle size must be controlled <10mm.<\/p>\n\n\n\n\n
Composition: Mainly iron and a small amount of carbon.
Characteristics: Exothermic during high-temperature oxidation, saving solid fuel.
Application: Added to sintering materials to increase the iron content of sintered ore and reduce fuel consumption.<\/p>\n\n\n\n\n
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All materials must be mixed thoroughly in advance to avoid unstable blast furnace conditions caused by composition fluctuations.
Dust and sludge with a zinc content >0.5% must be dezincified first and are strictly prohibited from being directly fed into the furnace.<\/p>\n\n\n\n