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t3s { d { (u)r {  <| { 70%{s  s {  7p3ws {c s xs (1400~1800)  s  

t3s  y89% ; { <s ;zz ,< {{  t  v ; y cs s !  b  :lz

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t3s :  5c #919駳15%~20%9 #s 7 5 s<  3!

{s % ty7s h% <5% =%| %2/3 ty s p  s 9 tzyu- 

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t3s 3230*114*65{- ms  230*115*65 7230*115*40230*115*30}150*120s Al2O340% Fe2O32.02.5%2 6585%zs 3515%=zs %  %, lp ,y  ,<1400 sc=s   #2 2, Al2O3

t3s { d { (u)r {  <| { 70%{s  s {  7p3ws {c s xs (1400~1800)  s  

t3s  y89% ; { <s ;zz ,< {{  t  v ; y cs s !  b  :lz

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t3s :  5c #919駳15%~20%9 #s 7 5 s<  3!

{s % ty7s h% <5% =%| %2/3 ty s p  s 9 tzyu- 

~{ ~7y u ~  z =9  s7{29};2 

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