More out of ore!

THE APPLICATION OF STEEL BELT TECHNOLOGY FOR THE SINTERING

OF MANGANESE ORE FINES

TESTED ORES

MAIN PHASES OF SINTER• Mn3O4, manganese oxide• Mn2AlO4, manganese aluminium oxide• MnO, manganosite• Mn2SiO4, tephroite

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Mn-C -O Phase Stability Diagram at 1350 C

File: C:\HSC3\MNCO1350.IPS log pCO2(g)

log pO2(g)

Mn

MnC2

MnCO3

MnO

MnO2

Mn2O3

Mn3O4

• Sintering tests• Agglomeration with bentonite• Variation of

• coke• gas amounts and temperatures• retention times

• Analysis• chemical• structure• modified Tumbler-test

TEST PROSEDUREPILOT SCALE

TEST EQUIPMENT

SINTER FEED

BEFORE AGGLOMERATION

AFTER AGGLOMERATION

PRODUCT SINTER

Sintering temperature profile

Carbonate type ore MnO2 type ore

Bixbyite/Braunite type ore

Pressure difference in tests

Production scheme

CO GAS UTILISATION

PRODUCTSINTER

MICRO PELLETISING

S INTERING

GAS CLEANING

· FINES· COKE DUST· DUST· BENTONITE

MIXING

S MELTING

Fe Mn

· SINTER· COKE· FLUX

WATER TREATMENT S LAG CASTING

FERROMANGANESE PLANT

PROCESS FLOWSHEET

18 AUGUST 1997 / JIV

GAS CLEANINGDUST TO DOSING

SCRUBBING WATERS AND COOLING WATERS TO CONSUMPTION P OINTS

RAW WATER

RIVER/ WELL

SETTLING POND

SLURRY FROMSCRUBBERS

COOLING AIR FANS

CO-GAS

CO-GAS

THIS DRAWING AND DESIGN, INCLUDING ANY PATENTED ORPATENTABLE FEATURES, EMBODIES CONFIDENTIAL INFOR-MATION OF OUTOKUMPU OY AND ITS USE IS CONDITIONEDUPON USERS AGREEMENT NOT TO REPRODUCE THE DRAWING OR DESIGN, IN WHOLE OR IN PART, NOR THEMATERIAL, DESCRIBED THEREON, NOR TO USE THE DRAWINGOR DESIGN FOR ANY PURPOSE OTHER THAN SP ECIFICALLYPERMITTED IN WRITING BY OUTOKUMPU OY

CO-GASFAN

BOTTOM LAYERSINTER

CRUSHING

CO- gas forother purposesthan sinte ring

FINE COKE

CO-GAS

CHARGE

PREHEATING

Steelbelt Sintering Furnace (Cr)

Plant layout for chromite (basis for Mn)

SINTERING FURNACE (Mn)

SCHEMATIC DRAWING OF SINTERING

CONCLUSIONS

• Temperature control (/profile) important in drying and in sintering

• Moisture / coke / cooling air circulation• Coke fines/dust required

• Coal volatiles can block the bed or burn near steel belt• Pressure difference

• In sintering lower than with chromite sintering but higher in drying

• CO-gas from closed smelting furnace can be utilised • Saving of coke fines

THANK YOU OF YOUR ATTENTION

Saimaa Ringed Seal