US3758385A - Process for coking lignitic coal - Google Patents

Process for coking lignitic coal Download PDF

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Publication number
US3758385A
US3758385A US00094826A US3758385DA US3758385A US 3758385 A US3758385 A US 3758385A US 00094826 A US00094826 A US 00094826A US 3758385D A US3758385D A US 3758385DA US 3758385 A US3758385 A US 3758385A
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US
United States
Prior art keywords
coal
coke
pieces
paste
lignitic
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Expired - Lifetime
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US00094826A
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English (en)
Inventor
K Fischer
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Fischer Holdings Ltd
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Fischer Holdings Ltd
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Publication date
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Publication of US3758385A publication Critical patent/US3758385A/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • C10B53/08—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form in the form of briquettes, lumps and the like

Definitions

  • the coke used must have a crushing strength suflicient to support, without crushing, weight of iron ore and limestone.
  • Coke which crushes easily usually breaks down into fines which not only inhibit the passage of hot gas through the furnace but can be lost during initial smelting stages thus reducing furnace effectiveness and increasing production costs.
  • the present invention provides a process for making constructed smelting coke, having a high crushing strength, from lignitic coals.
  • Constructed coke prepared in accordance with the process of the present invention is less costly than constructed coke of prior art processes as energy requirements are lower, binder are not required and production is higher.
  • Step 1 Preparing a coal paste.
  • Step III Drying the pieces.
  • STEP I Lignitic coal is first passed through a mill 10, such as a ball or other suitable mill to reduce particle size to about 4 mm.
  • the milled coal is then passed over screens 11 to remove wood components, usually found in brown coal, and oversize coal particles are returned to the mill 10' for further reduction.
  • the screen coal is then further reduced and kneaded in a colloid mill 12 to form a paste having a particle size less than 0.15 mm.
  • the colloid mill can be of a known type such as is used in comminuting wood pulp and has kneading and comminuting rotors 13. Moisture content of the coal paste is maintained at not less than fifty percent--fifty-five percent being optimum. Consequently water must be added during kneading in the colloid mill to provide a paste having the desired moisture content when preparing drier coal.
  • the coal is milled in the colloid mill to a particle size between 0.08 mm. to 0.12 mm. and, if it is to be used to produce a coke having a charcoal structure, it is milled to a particle size between 0.12 mm. to 0.15 mm.
  • the paste produced in the colloid mill is then passed through an extruder 14 onto a travelling grate 15.
  • the extruder can be a worm press and operates at low pressure as the paste is fluid.
  • edge length being reduced to about fifty percent of former length and specific gravity increases about three hundred percent.
  • the pieces become sufficiently hard to withstand, without undue breakage, handling and transportation by conventional means.
  • Smelting coke produced by the present process has a fine porous texture and has a high crushing strength. Abrasion test results run as high as eighty-five percent, comparing favourably with the best pit coal cokes.
  • the present process can, most advantageously be used in the smelting of iron ore fines.
  • iron ore fines can be smelted only with great difiiculty and at a high cost.
  • During preparation of the coal paste iron ore fines can be added so as to produce a homogenous mixture of coal and ore. The ore fines remain entrapped in the pieces during coking and during subsequent use of the coke in a blast furnace.
  • Lignites of highest rank which are sometimes classified as low rank subbituminous coal may not be suitable for production of coke in accordance with the present process as they usually do not retain sufficient moisture when prepared in paste form to maintain desired shape prior to and during drying. It is to be understood, therefore, that the process is directed to production of constructed coke from brown coal and, usually, lignites of lower rank.
  • a process for making coke from lignitic coal consisting essentially of the steps of:
  • a process as claimed in claim 1 including adding ore fines to the coal during preparation of the coal paste.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Coke Industry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
US00094826A 1970-12-03 1970-12-03 Process for coking lignitic coal Expired - Lifetime US3758385A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9482670A 1970-12-03 1970-12-03

Publications (1)

Publication Number Publication Date
US3758385A true US3758385A (en) 1973-09-11

Family

ID=22247414

Family Applications (1)

Application Number Title Priority Date Filing Date
US00094826A Expired - Lifetime US3758385A (en) 1970-12-03 1970-12-03 Process for coking lignitic coal

Country Status (9)

Country Link
US (1) US3758385A (enExample)
JP (1) JPS5110601B1 (enExample)
AU (1) AU448453B2 (enExample)
BE (1) BE776155A (enExample)
CA (1) CA946327A (enExample)
DE (1) DE2158393C3 (enExample)
FR (1) FR2117210A5 (enExample)
IE (1) IE35862B1 (enExample)
IT (1) IT945260B (enExample)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031189A (en) * 1975-03-13 1977-06-21 Verkaufsgesellschaft Fur Teererzeugnisse (Vft) Process for preparing composition containing carbon and low sulfur, nitrogen and ash content
US4111664A (en) * 1976-06-29 1978-09-05 Saarbergwerke Aktiengesellschaft Method of and an arrangement for making stable massive compacted coal charge bodies for use in a coking oven
US4178215A (en) * 1976-06-30 1979-12-11 Sumitomo Metal Industries Limited Method of manufacturing blast furnace coke
US4701184A (en) * 1985-02-14 1987-10-20 The University Of Melbourne Upgrading solid fuels
RU2318011C1 (ru) * 2006-11-13 2008-02-27 ООО "ХимТэкс" Способ охлаждения кокса, полученного методом термоокислительного коксования на цепной колосниковой решетке

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3041627A1 (de) * 1980-11-05 1982-06-09 Artur Richard 6000 Frankfurt Greul Verfahren zum aufarbeiten von zellulosehaltigen biomassen bzw. braunkohle und lignit zu einem einheitlichenk stark reaktionsfaehigen, staubfoermigen brennstoff
DE3442202A1 (de) * 1984-11-19 1986-05-28 Wilhelm 7954 Bad Wurzach Ehrlich Verfahren zur erzeugung von koksgranulat als aufkohlungsmittel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031189A (en) * 1975-03-13 1977-06-21 Verkaufsgesellschaft Fur Teererzeugnisse (Vft) Process for preparing composition containing carbon and low sulfur, nitrogen and ash content
US4111664A (en) * 1976-06-29 1978-09-05 Saarbergwerke Aktiengesellschaft Method of and an arrangement for making stable massive compacted coal charge bodies for use in a coking oven
US4178215A (en) * 1976-06-30 1979-12-11 Sumitomo Metal Industries Limited Method of manufacturing blast furnace coke
US4701184A (en) * 1985-02-14 1987-10-20 The University Of Melbourne Upgrading solid fuels
RU2318011C1 (ru) * 2006-11-13 2008-02-27 ООО "ХимТэкс" Способ охлаждения кокса, полученного методом термоокислительного коксования на цепной колосниковой решетке

Also Published As

Publication number Publication date
CA946327A (en) 1974-04-30
DE2158393B2 (de) 1979-05-31
IE35862L (en) 1972-06-03
DE2158393C3 (de) 1980-01-17
JPS5110601B1 (enExample) 1976-04-05
FR2117210A5 (enExample) 1972-07-21
AU3613871A (en) 1973-05-31
IT945260B (it) 1973-05-10
IE35862B1 (en) 1976-06-09
DE2158393A1 (de) 1972-07-20
AU448453B2 (en) 1974-04-26
BE776155A (fr) 1972-04-04

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