Critical whisker bond of a profound chromium-free refractory for RH degassers

Magnesia–chrome brick has been abandoned in the use of Ruhrstahl Heraeus (RH) degasser in China for hexavalent chromium (Cr 6+ ), a reaction product, is classified as carcinogenic potential. Because continuous Al-leading reaction behind the hot face results in the formation of a dense network of int...

Full description

Saved in:
Bibliographic Details
Published in:Sadhana (Bangalore) 2022-06, Vol.47 (2), Article 70
Main Authors: Guo, Zongqi, Ma, Ying, Dang, Xiaomei, Feng, Chao, Duan, Feng
Format: Article
Language:English
Subjects:
Carcinogens
Chromium
Degassers
Engineering
Hexavalent chromium
Periclase
Reaction products
Spinel
Whiskers (metals)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Magnesia–chrome brick has been abandoned in the use of Ruhrstahl Heraeus (RH) degasser in China for hexavalent chromium (Cr 6+ ), a reaction product, is classified as carcinogenic potential. Because continuous Al-leading reaction behind the hot face results in the formation of a dense network of interwoven whisker in the matrix as temperature gradient moves, an unburnt periclase–spinel–Al brick has been affirmed as an alternative, with an advanced bonding system that can effectively reduce the penetration of slag and Fe melt, generate superior flexibility and hot strength to resist rapid-flow melt attack and thermal circulations, and present minor positive value of permanent expansion to ensure the closed joints of monolized lining when switching to lower temperature. A whisker bond is defined to be critical for the pronounced performance and extensive application of the unburnt periclase–spinel–Al bricks in RH degassers to substitute magnesia–chrome brick in steel refining process.
ISSN:0256-2499
0973-7677
DOI:10.1007/s12046-022-01836-z