a kinetic study of hot metal desulphurization by calcium ... · calcium carbide is one of the...
TRANSCRIPT
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A KIIETIC STUDY OF HOT ttETAL DESULPHURl-ZATION
BY CALCIU" CARBIDE PONDER INJECTION
by
(f) L. K. ChIang, B.Sc
A ThesIs
SubmItted to the School of Graduate StudIes
In PartIal FulFI I.lment .oF· the RequIrements
For the Degree
Doctor of PhIlosophy
~ McMaster UnIversIty
September, 1986
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0-315-35872_6
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A KINETIC STUDY OF HOT METAL DESULPHURIZATION
BY CALCIUM CARBIDE· POWDER INJECTION
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'Doctor or Ph I 10sdphy, (1986) j McMaster Un'iversity
HamIlton, Ontario
TITLE: A Kinetic Study of Hot Metal De~wlphurlzatlon
by Calcium Carbide Powder InJection. ,":, .
. ,-,' . ' \ AUTHOR: L I u-'Kyen Ch lang
B.Sc. National Cheng Kuhg University
Taiwan,' Republic of China
SUPERVISORS: Proressor G.A. Irons ,and Proressor W -K. Lu • \
NUMBER OF PAGES: xxx,327
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" ABsTRACT
curreritly, 'sulphur ~s the most problematic
Impurity which aFFects the physical and mechanical
propert I'es 0.'1" stee I. ThereFore a I I the I ntegrated s~E!e I
producers desulphurlze Iron beFore steelmaking. Calcium
carbide Is one of the reagents used to desulphurlze~ot
metal from the blast furnace, yet the kinetic reaction
phenomena are not c I ear. The present work was ! n,ft ! ated to
study the k. I n~t I cs of hot meta I desu I phur. I zat I on by "~ . calcium carbide powder Injection at the 3 Tonne scale.
The most Important variables which 'aFFect the rate
and eFFiciency of calcium carbide desulphu':"t.zatlon are the
type of top slag, the Injection conditions and the oxygen
activity In the hot metal •
. The present resu Its quant I tat I ve I y demonstrate
these eFf'ects.The experimental results Indlcl;lte that control
of the Initial s'iag condition can ef.Fect-ively Improve the, , .
rate and ef'FIciency of calcium carbldedesulphurlzatlon. It
was Found that lower solid loading Is klnetlcal!y ~avorab.le
f'or both s I ag/meta I and p (ume desu I phur! zat ! on. Oxygen
activity measur~ents show tha~,oxygen plays ~ crucial role
In desu I phur I zat ,-on, part I cu 1 ar.1 y to ach I eve' extra-:'1 ow
su I phur 1 eve 1 s. iii
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A'steedy-state. one-dimensional. three-phase model
was' developed to model the plume de~ulphurlzatlon' klnetlcs~ -'--The model permits e quantltatl"e analysis of the p,resent
" experimental' re~ults. The computed results from the model
·are Found to be conslstent'wlth, the experimental data.
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