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Title:
SLAG CONTAINING INSOLUBLE Pb AND SLAG TREATMENT METHOD FOR INSOLUBILIZING Pb
Document Type and Number:
Japanese Patent JP2001194074
Kind Code:
A
Abstract:

To insolubilize Pb contained in slag that is generated in a Pb- containing steel-making process.

The composition of slag containing at least 0.001 mass % of Pb is adjusted to satisfy an expression (1), (T.CaO)/(SiO2)≤1.5, then the slag is separated or removed from the molten steel bath surface, further after the separation or removal thereof, a steam-aging treatment of at least 5 days, or an outdoor storage of at least 90 days is conducted. In the expression, (T.CaO) shows a concentration (mass %) in terms of (CaO) of the total Ca contained in the slag, and (SiO2) shows an in-slag (SiO2) concentration (mass %). By this treatment, the amount of Pb elusion from the slag satisfies the value of the environmental quality standard, and the slag can be put to use as a resource.


Inventors:
Nakao, Ryuji
Morishige, Hiroaki
Matsunami, Tadanori
Application Number:
JP2000000000866
Publication Date:
July 17, 2001
Filing Date:
January 06, 2000
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
C21C5/36; F27D15/00; (IPC1-7): F27D15/00; C21C5/36
Attorney, Agent or Firm:
石田 敬 (外3名)