Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
  • C10L5/00—Solid fuels
  • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
  • C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
  • C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
  • C10L5/14—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders

Definitions

• the present invention relates to combustible agglomerates comprising a granular solid carbonaceous combustible material and a binder; it also relates to a process for manufacturing such agglomerates.
• Solid carbonaceous combustible materials are currently used in the most diverse fields and in particular in many industrial processes, in particular the processes of steel making or recarburization of steels and cast irons, where they serve as a source of energy. , reducing material and / or carburizing agent.
• the Applicant has therefore sought to bring this lignite coke in a denser, non-pulverulent form capable of being introduced into the converters in order to easily penetrate the mass of molten metal by simple gravity. It therefore carried out an in-depth study with a view to producing agglomerates from lignite coke and a binder, these agglomerates having to have sufficient mechanical strength to allow their handling under relatively severe conditions.
• an agglomerate, of the briquette, ball or pellet type having the desired properties and comprising a granular solid carbonaceous combustible material and a binder, in which said combustible material the aforementioned lignite coke and said binder is constituted by starch within which are distributed anthracite fines acting as reinforcing filler of the matrix formed by the starch.
• the lignite coke will preferably be chosen to have a grain size not greater than 5 mm, the anthracite fines for their part, preferably a particle size of the order of 0.5 to 4 mm.
• the proportion by weight of lignite coke, starch and anthracite fines within the agglomerate according to the invention is advantageously respectively from 60 to 90% (preferably 65-80%), 5 to 10% and 5 to 30% (preferably 10 to 25%), a particularly preferred composition being as follows: lignite coke 72% by weight, anthracite fines 20% by weight, starch 8% by weight.
• the starch used according to the invention can be chosen from starches of all kinds and in particular from native starches, for example corn or wheat starches, and native starches made soluble in water by a cooking treatment. extrusion.
• the water used in this process is advantageously used partially in the form of liquid and partially in the form of superheated steam, for example at a temperature of 150 to 200 ° C, especially 185 ° C, the relative proportions of the liquid water and steam being chosen so that the mixture to be kneaded is at the temperature of 100-110 ° C.
• the treatment of the dough uses conventional agglomeration techniques widely described in the literature; this may include, in particular, briquetting, extrusion and pressure compaction techniques.
• drying it advantageously consists in subjecting the agglomerate to a baking, preferably in an oven with circulation of hot air at 110-130 ° C.
• the agglomerate according to the invention has very good cohesion, its mechanical resistance to compression possibly reaching values of the order of 150.105Pa.
• the resulting dough is extracted at the base of the latter and brought into a compacting device of the roller press type having cavities imprinting the shape desired to agglomerates.
• the agglomerates thus obtained are then deposited on a metal mat passing through a hot air circulation oven at 110-130 ° C, the speed of advancement of this mat being chosen so that the residence time of said agglomerates inside the oven for at least 2 hours.
• the resulting dried agglomerates have a bulk density of the order of 0.7 and a compressive strength, measured using a compressometer of the SAHUT CONREUR type, of the order of 150.105Pa.

Landscapes

• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Environmental & Geological Engineering (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Geology (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Solid Fuels And Fuel-Associated Substances (AREA)
• Manufacture And Refinement Of Metals (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=9396676

Family Applications (1)

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Cited By (1)

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Citations (3)

• 1990
  • 1990-05-16 FR FR9006129A patent/FR2662172B1/fr not_active Expired - Fee Related
• 1991
  • 1991-04-26 EP EP91401118A patent/EP0457635A1/de not_active Ceased
  • 1991-05-13 IE IE164091A patent/IE911640A1/en unknown
  • 1991-05-15 RU SU914895304A patent/RU2016048C1/ru active
  • 1991-05-15 NO NO91911891A patent/NO911891L/no unknown

Patent Citations (3)

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