JPS5591904A - Discharging method for large lump in reducing rotary kiln - Google Patents

Discharging method for large lump in reducing rotary kiln

Info

Publication number
JPS5591904A
JPS5591904A JP16506678A JP16506678A JPS5591904A JP S5591904 A JPS5591904 A JP S5591904A JP 16506678 A JP16506678 A JP 16506678A JP 16506678 A JP16506678 A JP 16506678A JP S5591904 A JPS5591904 A JP S5591904A
Authority
JP
Japan
Prior art keywords
kiln
rotary kiln
reducing agent
rotating speed
large lumps
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP16506678A
Other languages
Japanese (ja)
Inventor
Kazuharu Yatsunami
Katsuaki Shiobara
Yutaka Nakamura
Shigeaki Murata
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.)
KOKAN KOGYO KK
Kokan Mining Co Ltd
JFE Engineering Corp
Original Assignee
KOKAN KOGYO KK
Kokan Mining Co Ltd
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KOKAN KOGYO KK, Kokan Mining Co Ltd, NKK Corp, Nippon Kokan Ltd filed Critical KOKAN KOGYO KK
Priority to JP16506678A priority Critical patent/JPS5591904A/en
Publication of JPS5591904A publication Critical patent/JPS5591904A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)

Abstract

PURPOSE:To make it possible to draw off large lumps in a rotary kiln while operating the rotary kiln without use of manpower or mechanical power, by controlling suitably the quantity of reducing agent and the rotating speed. CONSTITUTION:To a rotary kiln 1 which normally rotates at a rotating speed 0.6- 1.0rpm is fed green pellets 1b having been dried, preheated, and hardened in a preheater 2. Simultaneously, a reducing agent such as coal is charged from a feeder set to the lower part of an after-burner 3 at a rate about 0.45Cfix/Fe. The green pellets are reduced with reducing agent while being rolled in a mixed state to form CO, H2, which are burned with supplied air 4 and are directed to a discharging outlet 1a. When large lumps are formed in the kiln 1 during the operation, the reducing agent is remarkably increased temporarily to 0.60-1.00Cfix/Fe, and the rotating speed of the kiln 1 is notably decreased to 0.1-0.4rpm. As a result, large lumps in the kiln 1 are moved in the direction of the outlet 1a and are drawn off easily and suitably to the outside.
JP16506678A 1978-12-29 1978-12-29 Discharging method for large lump in reducing rotary kiln Pending JPS5591904A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16506678A JPS5591904A (en) 1978-12-29 1978-12-29 Discharging method for large lump in reducing rotary kiln

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16506678A JPS5591904A (en) 1978-12-29 1978-12-29 Discharging method for large lump in reducing rotary kiln

Publications (1)

Publication Number Publication Date
JPS5591904A true JPS5591904A (en) 1980-07-11

Family

ID=15805209

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16506678A Pending JPS5591904A (en) 1978-12-29 1978-12-29 Discharging method for large lump in reducing rotary kiln

Country Status (1)

Country Link
JP (1) JPS5591904A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408159A1 (en) * 1989-07-14 1991-01-16 Boliden Allis, Inc. Apparatus and process for direct reduction of materials in a kiln
US5100314A (en) * 1989-07-14 1992-03-31 Svedala Industries, Inc. Apparatus and process for direct reduction of materials in a kiln

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408159A1 (en) * 1989-07-14 1991-01-16 Boliden Allis, Inc. Apparatus and process for direct reduction of materials in a kiln
US5076838A (en) * 1989-07-14 1991-12-31 Svedala Industries, Inc. Process for direct reduction of materials in a kiln
US5100314A (en) * 1989-07-14 1992-03-31 Svedala Industries, Inc. Apparatus and process for direct reduction of materials in a kiln

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