Page 33 - Technology Compendium

CSIR-IMMT/EXM - 04

Method for recovery of iron rich magnetic portions suitable for sinter/pellet plants from steel
making process waste sludge and a system therefor

Advantages / Salient Technical Features IPR Status / Details (India/Abroad)
• Cost effective, efficient and environment friendly • A joint patent has been filed by CSIR- IMMT
and JSW Dolvi based on the outcomes
Problem being addressed of this process (Patent Application No.
202111029228)
• The proposed work aims to solve the problem of
utilizing one of the wastes generated from Blast
Furnace during steel making i.e., gas cleaning plant Application/Uses
(GCP) sludge. GCP Sludges generated are of fine • This process can be used to produce iron
particle size, containing high moisture content which rich product from GCP sludge suitable for
cannot be recycled back to the plant as it has very low agglomeration and complexes of zinc as
Fe (< 30%) along with high amount of non-magnetic saleable product
material such as KCl Salts, zinc, etc. Zinc is associated
as both oxides (ZnO oxides) and sulphide (ZnS Scale of Development
sulphides), where as Pb is in oxide form in most of the
cases which makes the residue unfit to use in sinter • Bench Scale - 1 kg scale (Current TRL
or pellet process again. Thus, zinc and lead content Level : 03/04)
should be adjusted along with Fe content to make
the sludge to reuse again. The current innovation will Commercialization Status
help in the development of a method for recycling • Not commercialized yet
• Gas cleaning plant sludge (GCP) and more specifically,
to a method to recover materials for sinter or pellet Techno-economics
plant by balancing Fe and Zn values through a
combined hydro and pyro metallurgical process. • NA

Environmental Considerations (if any) Technology Package
• It is environment friendly technology. • Process flow sheet

Major Raw Materials to be Utilized
• Gas Cleaning Plant (GCP) Sludge of Steel Industries

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