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Patent Searching and Data


Title:
PELLET HAVING DOUBLE STRUCTURE FOR IRON MANUFACTURE
Document Type and Number:
Japanese Patent JPS5719337
Kind Code:
A
Abstract:

PURPOSE: To improve the softening properties of pellets at high temp. by forming each pellet with a basic core part having a specified iron content or above and a specified basicity value or below and a shell part satisfying 2 conditions of basicity and MgO content in a region above a specified temp. in specified melt-producing isothermal curves.

CONSTITUTION: Baic pellets for iron manufacture are formed with fine iron ore as starting material. Each core part has ≥64% iron content and ≤1.9 basicity represented by CaO/SiO2. Each shell part is allowed to satisfy 2 conditions of the ratio of CaO/SiO2 and MgO content in a region above 1425°C in melt-producing isothermal curves shown by the figure. Thus, the softening starting temp. of the core part is raised, and delayed reduction occurs hardly. Even if the iron content of the shell part is changed somewhat, the melting-down temp. is stably maintained at a high level, so the softening properties of the pellets at high temp. are improved.


Inventors:
IKEDA TSUTOMU
INOUE KATSUHIKO
Application Number:
JP9313880A
Publication Date:
February 01, 1982
Filing Date:
July 07, 1980
Export Citation:
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Assignee:
KOBE STEEL LTD
International Classes:
C22B1/14; (IPC1-7): C22B1/14