(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Children's Library | Biodiversity Heritage Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "Metallurgy Of Cast Iron"

72                             METALLURGY   OK.  CAST   IRON.
gives greater heat in the cupola. This is so effective that where upper tuyeres are not used, the escape of carbonic oxide g'as may often be so great that when it reaches the charging- door and obtains oxygen from          -{
the air, it often creates such a combustion as to send a flame many feet above the top of the stack, causing-much loss of heat.                                                                   i '
The following Tables 15, 16, and 17 show the amount            j
of heat absorbed in smelting and that lost by radiation            ]
and  in  gases, according  to  Sir Lowthian Bell's  esti-            \
mate, expressed in hundredth-weight heat units   per            
ton of iron produced :                                                               I
i;
TABLE   15-  HEAT   PRODUCTION.                                                          |
Oxidation of carbon ............................................................  81,536 units                               I
Contributed by blast ...........................................................   11,919    "                                   |l
-                93,455                  I
TABLE  16.  HEAT  ABSORPTION.                                                      L^,
Evaporation of water in coke .............................................       312 units
Reduction of iron ...............................................................   33, ioS     "                                       i
Carbon impregnation ........................ . ..............................    1,440     "                                       I
Expulsion of CO 2 from limestone ......................................    5,054     "                                       |
Decomposition of CO 2 .......................................................    5,248     "                                       I
Decomposition of water in blast .............. ..........................    2,720     "
Phosphorus, silicon and sulphur reduced ..........................    4, 174     "
Fusion of pig- iron .............................................................    6,6co     "
Fusion of slag .....................................................................   16,720     "                                     t-
--               75,376                   "'
TABLE   17.  IIKAT   LOSS.                                                                  ^
Transmission throug-h walls of furnace ............................    3,658 units                            
Carried off in tuyere water ..................................................    i.SiS     "                               If
Carried off in gases .............................................................    8,860     "                               \,
Expansion of blast, loss of hearth, etc ..............................    3,743     "
-               18,079
93,455
By increasing the height of furnaces from seventy to one hundred feet, as practiced at the present day,