- Many potential crude
zinc oxides sources are in electric arc furnace (EAF) dust, galvanising
ashes, brass foundry and converters fumes
-
An exhaust gas is created
in each blast furnace that is called blast furnace gas. It contains dust
that must be eliminated. During the first step, i. e. the dry cleaning
phase, the coarse dust is separated. The separated blast furnace dust
might have a zinc content of up to 30%.
-
Blast-furnace (BF) flue
dust consists of iron-oxide particles, oxides, carbon and lime, and it
generated by the blast furnace during smelting and collected in the air
pollution system (i.e. bag
house). It typically consists of iron oxide and 1.5% zinc.
- EAF dust contains
about 15-35 % Zn and some toxic metals such as Pb, Cd and Cr. It is well
known that EAF dust is used as a substitute for zinc ores in many
countries
-
In order to reduce the cost and even better to make profit from the
dust, EAF steelmakers need to find a cost-effective technology to
separate zinc from EAF dust.
-
Two approaches of
in-process separation of zinc from
EAF dust are (a) prematurely collecting dust at very
high temperature while zinc is still in vapor status, and (b)
prematurely capturing dust immediately after quickly cooling
EAF off-gas from high temperature to low temperature. Benefit
of in-process separation of zinc from EAF dust is from saving of
transportation cost and recycling cost of iron-rich product and
value increase of high-zinc product. -
Zinc is shortage forecast
for 2015 through 2020
-
EAFD Project of 200,000 tpa
may require an investment of US $ 110 Millions roughly
|
Background
Information
- Pyrometallurgical Processes
-
Blast furnace wastes
-
Steel
Plant Wastes
-
Wastes Released from Blast Furnace
Operation
-
Blast Furnace waste dust
-
Zinc rich
steel industry waste
Technology
and Patent
- Caustic
Soda Leach of Electric Arc Furnace Dust
-
Pressure
Leaching of EAF Dust
with Sulphuric Acid -
Separation of Zinc from EAF Dust
-
Zinc and iron removal by
chlorination roasting. -
Stabilization of EAF Dust
-
The processing of
Zinc containing Materials
-
Zinc from
secondary sources
-
Dust Recycling systems
-
Process for the
removal of Zinc from Blast Furnace gas wash water
Recycling Process
-
Recovery process
-
Hydrometallurgical process
-
Process for the recovery of Zinc from BOF
dusts & sludge
- Waste and dust
utilization in shaft furnaces
- Dust
Supplier
- Leaching
and cementation Eaf dust
- Recycling
Blast Furnace Flue Dust as Pellets
|
Company Information
-
Company Presentation
-
Company &
Projects
-
Company in USA
-
Company
performances
-
Company Profile
Machinery Suppliers
-
Equipment Supplier
-
Custom engineered
Equipments
Consultants
- Technology & Consultancy
-
Project Development
-
Technical
Consultant
-
Technology provider
-
Success Story
-
Project
Engineering company
-
Project Consultant
Reports
-
Zinc Industry Developments
-
Environmental issues
-
Dust recycling
-
Non Ferrous Metal Industry
-
Emissions & regulations
-
Environmental contaminants
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