Page 28 - Technology Compendium

CSIR-IMMT/MIN - 17

Complete utilization of iron bearing solid wastes of steel plant such as BF dust/sludge,
SMS dust/sludge, mills scale etc

Advantages / Salient Technical Features Major Raw Materials to be Utilized
• Complete utilization of iron bearing solid wastes in • Iron bearing solid wastes and as per the
the form of briquettes requirements of the process
• Use of non-coking coal and these solid wastes for
making Ferro-coke IPR Status / Details (India/Abroad)
• Recovery of iron values in the form of DRI • Process know how
• Recovery of iron values in the form of magnetite
which could be used as media in coal washeries Application/Uses
• Low cost micro-pellets could be used directly as sinter • Wastes can be completely recycled back
feed to the system either through sinter or
BOF route. Carbon and iron values can be
Problem being addressed recovered for further application such as
• Around 10-30 kg of blast furnace dust/sludge are fuel, reductant and raw materials.
produced per ton of hot metal. Blast furnace dust or
sludge contains substantial quantities of carbon and Scale of Development
iron values. Typically, a blast furnace dust/sludge may • Technology Demonstration (Current TRL
contain around carbon 25-35%, iron values 35-40%. Level : 05)
The carbon values are mostly present in the form
of coke breezes or dusts and iron values are mostly
present in the form of hematite and magnetite. Commercialization Status
Similarly dust/sludge is also produced from the SMS. • Steel Plant Waste briquetting process has
Typically, SMS sludge may contain around 60 to 65% been transferred
of iron values in them. Further it may contain around
8-10% of CaO. The iron values are present in the form
of metallic iron, and wustite. The ultrafine particles Techno-economics
of blast furnace and SMS dust/sledges could not be • NA
recycled back into the system through sintering.
Technology Package
Environmental Considerations (if any) • Concept to Design
• Environment Friendly & utilisation of wastes for
creation of wealth

26