A Kinetic Study of Hot Metal Desulphurization by Calcium ... · Calcium carbide Is one of the...

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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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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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