HYDROGEN REDUCTION-MECHANISMS OF ILMENITE BETWEEN 823 AND 1353-K

被引:39
作者
BRIGGS, RA
SACCO, A
机构
[1] Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester
关键词
D O I
10.1557/JMR.1991.0574
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In situ gravimetric measurements and microscopic examinations were used to determine the mechanisms of oxygen removal from synthetic ilmenite disks between 823 and 1353 K. Under a hydrogen atmosphere, iron was observed to form a layer of low porosity on the surface of samples early in the reduction. This created diffusion limitations for hydrogen to the reaction front and for the escape of water vapor. A shrinking core reduction model, modified to include the growth of this iron film, was capable of predicting the conversion-time relationships of ilmenite samples. An activation energy of 43.2 +/- 2.6 kcal/gmole was determined to be representative of reaction control over the temperature range 823-1023 K.
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页码:574 / 584
页数:11
相关论文
共 45 条
[1]  
AGOSTO W, 1983, 6TH P PRINC SPAC STU
[2]   HIGH-TEMPERATURE REDUCTION KINETICS OF ILMENITE BY HYDROGEN [J].
BARDI, G ;
GOZZI, D ;
STRANGES, S .
MATERIALS CHEMISTRY AND PHYSICS, 1987, 17 (04) :325-341
[3]  
BRIGGS RA, 1988, 2ND P C LUN BAS
[4]  
BRIGGS RA, 1986, 2 LUN PLAN I SUMM IN
[5]  
CARMICHAEL RS, 1982, CRC HDB PHYSICAL PRO, V2
[6]  
CUKE NH, 1962, CAN I MIN METAL, V20, P76
[7]  
Donnelly R.P, 1970, AUST MIN, V62, P58
[8]  
Edstrom J. O., 1958, JERNKONT ANN, V142, P401
[9]   KINETICS AND MECHANISM OF ILMENITE REDUCTION WITH GRAPHITE [J].
ELGUINDY, MI ;
DAVENPORT, WG .
METALLURGICAL TRANSACTIONS, 1970, 1 (06) :1729-+
[10]  
FIHEY JL, 1979, CAN METALL QUART, V18, P419