Briquettesat Finnfjord - SINTEF€¦ · Industrial scale testing of coal and iron ore fines...
Transcript of Briquettesat Finnfjord - SINTEF€¦ · Industrial scale testing of coal and iron ore fines...
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Briquettes at Finnfjord
Industrial scale testing of coal and iron ore fines briquettes
NyKoSi agglomeration seminar, 22. November 2016Ørjan Berntsen
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▪ Production capacities:▪ 100.000 tons of ferrosilicon▪ 20.000 tons of silica▪ 340 GWh electrical power
▪ 130 employees▪ 825 MNOK revenue (2014)
▪ Algae cultivation project – carbon capture
‣One of the 10 largest ferrosilicon plants in the world‣Delivers 15% of the European demand for ferrosilicon.
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This is Finnfjord
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Background§ 1994: Project initiated by AS Sydvaranger - FESIL, Finnfjord, SINTEF.
§ Briquetting of coal/iron ore fines as a high value product for the metallurgical industry.
§ Based on pilot-scale results by SINTEF (75% FeSi):§ 10% increased silicon yield§ 16% reduced spec. power consumption§ Stable process conditions
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Project goals
To develop a coal and iron ore-briquet suited for the production offerrosilicon, which gives a better SiO-reactivity than the traditional charge of coal and Fe-pellets.
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Production of briquettesSome key-points from the patent
Ratio between carbon and (reduced) iron between 0,2:1 og 1,5:1 The grain size of the carbonaceous particles should not exceed 5 mm
with respect to agglomeration, but this depends on the particle size distribution.
High FSI coals are preferred to achieve highest reactivity
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• Produced by AGGLONORD, France
• Binder: Bitumen (Shell): ~ 8%
• 35x35 mm, pillow shaped. • Crushed down further to smaller fractions
at Finnfjord plant.
Production of briquettes
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Two tests were run at Finnfjord’s plant:
June/July 1995, briquettes made from Moniza coal, 140 Mt
Nov/Dec 1995, two qualities of briquettes made from Wawel and Longyear coals (173 Mt og 196 Mt lots, respectively)
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Test 1: Results using Moniza briquettes• Compressive strength = 80 kg
• Not much fines generation during transport and handling.
• Furnace operation worse with increased use of briquettes.
• Decreased production.• Low reactivity in coal. R = 1247 mL
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Test 2: Wawel/Longyear
Some lab results from coals and briquettes:
Wawel
• FSI: 4-5 • Reactivity: 664 mL SiO• Vol.: 31,2%, Fix-C: 65,6%, Ash:
3,2% (d.b.)
Resulting briquettes• Reactivity: 678 mL SiO• Comp. Str. ~120 kg
Longyear-kull
• FSI: 7-8• Reactivity 554 mL SiO• Vol.: 40,6%, FixC 54,8%, Ash:
4,6% (d.b.)
Resulting briquettes• Reactivity: 799 mL SiO• Comp. Str. ~120 kg
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Sizing after crushing
- Crushed until sizing of briquettes comparable to origin coals
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Production quantity using Wavel and Longyear briq.
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Specific power consumption using Wavel and Longyear briq.
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Results using Wawel/Longyear
Generally good production and low specific power consumption withboth types of briquettes
Visual impressions: Metallurgical good operation Favourable tapping conditions Even gas distribution in furnace charge
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Effects of increased ratio of briquettes
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Conclusions Sizing is of crucial importance Good reactivity in furnace after crushing
Binders: too much sulphur, and too costly.
Good mechanical strength. Durable
Increase ratio of briquettes: small positive (or no significant) change in production
Spec. power consumption reduced by 1-2% to referance period.
Patent granted NO 933264 06.03.96, «Method for production of FeSi».
Process under control with no change for the worse
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Thank you for your attention!