US3885983A - Method for preparing carbonaceous pastes - Google Patents

Method for preparing carbonaceous pastes Download PDF

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Publication number
US3885983A
US3885983A US292518A US29251872A US3885983A US 3885983 A US3885983 A US 3885983A US 292518 A US292518 A US 292518A US 29251872 A US29251872 A US 29251872A US 3885983 A US3885983 A US 3885983A
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United States
Prior art keywords
carbonaceous
water
paste
carbonaceous material
fragments
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Expired - Lifetime
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US292518A
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English (en)
Inventor
Roger Bulit
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rio Tinto France SAS
Original Assignee
Aluminium Pechiney SA
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Application filed by Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
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Publication of US3885983A publication Critical patent/US3885983A/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
    • C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
    • C04B35/532—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components containing a carbonisable binder
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof

Definitions

  • ABSTRACT [30] Foreign Application Priority Data Sept. 28, 1971 34750 Method and apparatus for the preparation of carbona ceous pastes intended primarily for use in the manufacture of electrodes wherein the prime materials,
  • the current practice is to cool the paste by the circulation of air while the paste is being advanced either by helical elevating systems or by covered conveyor belts.
  • costs are prohibitive and cooling takes place in an irregular manner.
  • the second method requires conveyor belts of great length and a large system of pipes for aspiration of the tar vapors. Continual cleaning of the pipes and the presence of suction units are clearly indispensable.
  • the method of preparing carbonaceous pastes intended particularly for use in the manufacture of electrodes, by heating and mixing prime materials, such as coke and tar, and by watercooling the pasty composition to a temperature above 100C is characterized in that, for the purpose of cooling the pasty composition, water is sprayed in atomized form within an enclosure or column through which fragments of the pasty composition are allowed to fall.
  • the apparatus for performing this method embodies a mixer in which the prime materials are heated and mixed, characterized in that the mixer comprises an enclosure or column at the top of which the mixer terminates and which is fitted with tubular ducts for admitting water and discharging the vapors that are generated.
  • FIGURE illustrates diagrammatically an apparatus embodying features of this invention for preparing carbonaceous pastes intended for use in the manufacture of anodes.
  • the apparatus illustrated comprises a screw-type preheating unit 1 of known type, into which very pure coke is introduced. After having been raised to a temperature of between approximately to C, the coke is tipped into a first screw-type mixer 2, and at the same time oil tar or petroleum tar is passed into this mixer through a duct 3. The coke and tar are mixed and heated in such a manner that the resultant pasty composition is always at a temperature of 150 to 170C.
  • the outlet for mixer 2 is at the top of a column 4 into which penetrate tubular ducts 5 having atomizers 6 at their ends for introduction of atomized water.
  • the column 4 communicates with a second screw-type mixer 7, the discharge end of which is located above a conveyor belt 8 which transports the paste to a pressing machine (not illustrated).
  • Manually operated valves 13 16, one of which, 16, is fitted in parallel with the pneumatically operated valve 10, enable the latter to be disconnected and the flow of water to be adjusted manually.
  • Pneumatic operation of the valve 10 is achieved by means of an electrically operated valve 17 associated with a pressure regulator 18 which in turn is controlled by an instrument for measuring the temperature of the paste at the outlet from the second mixer 7.
  • This instrument comprises an infrared visor 19 associated with a pressure regulator 20 and connected to a temperature recorder 21 which actuates the valve 17.
  • the pressure regulator 20 supplies air at very low pressure to prevent tar vapors, dust or air from becoming deposited upon the visor 19.
  • the water circulating line 9 also comprises, upstream of the valves 15 and 16, an electrically operated valve 22 which enables the flow of water to be stopped when the mixers cease to function, a motor-driven water pump 23, a non-return valve 24 and a pressure regulator 25 fitted in parallel with the pump.
  • thermocouple 28 The temperature of the coke, at the outlet from the preheating unit 1, is measured by means of a thermocouple 28 which is connected to a temperature recorder 29.
  • the apparatus functions in the following manner:
  • Coke is introduced into the preheating unit 1 and its temperature is measured at the outlet of this unit.
  • the flow of water into the circuit 9 is regulated by means of the manually operated valves 13 16, the valve being cut off from the circuit.
  • the water circulating system is brought into automatic operation by means of the valve 10, the manually operated valve 16 being closed.
  • the flow of water is then controlled by the temperature of the paste, as measured by the infra-red visor 19, which temperature should in general be between 100 and 1 10C.
  • the droplets of water, sprayed by the atomizers 6, vaporize rapidly when they move into intimate contact with the fragments of paste, so that excellent conditions for cooling take place.
  • the tar vapors and the water vapor are discharged through the pipe system 26 with the aid of the suction unit 27.
  • the pasty composition, collected at the upstream end of the second mixer 7, is virtually free from water vapor.
  • the temperature of the paste, after cooling, should be above 100C in order to cause all the water to vaporize and to prevent any of it from remaining in the paste.
  • the electrically operated valve 22 enables the supply of water to be cut off.
  • the main advantages of the invention are: the high degree of uniformity in the cooling of the paste; ease of regulating its temperature in a precise and rapid manner; the almost complete elimination of water vapor and tar vapors; only slight clogging of the vapor discharge ducts because of the fact that tar particles are entrained by the water vapor, only readily removable suspensions being formed; and reduced operating and maintenance costs.
  • a method of preparing, in particulate form, a carbonaceous paste consisting essentially of carbon in admixture with a carbonaceous binder capable of being fluidized by heat, for use of the carbonaceous paste particularly in the manufacture of electrodes comprising the steps of heating the carbonaceous paste to a pasty state at atemperature considerably above C, introducing said heated carbonaceous paste into a closed space and spraying water in atomized form into contact with the carbonaceous material as it passes through the enclosed space whereby the droplets of water vaporize upon contact with the heated carbonaceous material to break up the carbonaceous material into small and relatively dry fragments while simultaneously cooling the fragments of carbonaceous material, and collecting the cooled fragments of carbonaceous material for removal from the enclosed space.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
  • Discharge Heating (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
US292518A 1971-09-28 1972-09-27 Method for preparing carbonaceous pastes Expired - Lifetime US3885983A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7134750A FR2154842A5 (enrdf_load_stackoverflow) 1971-09-28 1971-09-28

Publications (1)

Publication Number Publication Date
US3885983A true US3885983A (en) 1975-05-27

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ID=9083545

Family Applications (1)

Application Number Title Priority Date Filing Date
US292518A Expired - Lifetime US3885983A (en) 1971-09-28 1972-09-27 Method for preparing carbonaceous pastes

Country Status (5)

Country Link
US (1) US3885983A (enrdf_load_stackoverflow)
JP (1) JPS4875601A (enrdf_load_stackoverflow)
FR (1) FR2154842A5 (enrdf_load_stackoverflow)
NL (1) NL7213058A (enrdf_load_stackoverflow)
OA (1) OA04266A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023979A (en) * 1971-06-30 1977-05-17 Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung Process for producing carbonaceous substances for use in synthetic-graphite and graphite-like bodies
US4257870A (en) * 1978-12-11 1981-03-24 Saarbergwerke Aktiengesellschaft Process for the purification of undistillable solid-containing hydrocarbon fractions produced in coal-refining
US5013503A (en) * 1989-02-06 1991-05-07 Aluminium Pechiney Process for continuous production of carbonaceous paste

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1639188A (en) * 1924-04-29 1927-08-16 Kleinschmidt Emil Process for the production of electrodes
US1837770A (en) * 1928-06-01 1931-12-22 Roessler & Hasslacher Chemical Process for making electrodes
US2459520A (en) * 1944-08-22 1949-01-18 Bruce D Greenshields Method of mixing bituminous materials with fillers
US2563285A (en) * 1948-09-09 1951-08-07 Great Lakes Carbon Corp Manufacture of carbon electrodes
US2645583A (en) * 1949-05-30 1953-07-14 Pechiney Prod Chimiques Sa Method of preparing carbon base pastes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1639188A (en) * 1924-04-29 1927-08-16 Kleinschmidt Emil Process for the production of electrodes
US1837770A (en) * 1928-06-01 1931-12-22 Roessler & Hasslacher Chemical Process for making electrodes
US2459520A (en) * 1944-08-22 1949-01-18 Bruce D Greenshields Method of mixing bituminous materials with fillers
US2563285A (en) * 1948-09-09 1951-08-07 Great Lakes Carbon Corp Manufacture of carbon electrodes
US2645583A (en) * 1949-05-30 1953-07-14 Pechiney Prod Chimiques Sa Method of preparing carbon base pastes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023979A (en) * 1971-06-30 1977-05-17 Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung Process for producing carbonaceous substances for use in synthetic-graphite and graphite-like bodies
US4257870A (en) * 1978-12-11 1981-03-24 Saarbergwerke Aktiengesellschaft Process for the purification of undistillable solid-containing hydrocarbon fractions produced in coal-refining
US5013503A (en) * 1989-02-06 1991-05-07 Aluminium Pechiney Process for continuous production of carbonaceous paste

Also Published As

Publication number Publication date
JPS4875601A (enrdf_load_stackoverflow) 1973-10-12
NL7213058A (enrdf_load_stackoverflow) 1973-03-30
FR2154842A5 (enrdf_load_stackoverflow) 1973-05-18
OA04266A (fr) 1979-12-31

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