Full resolution (JPEG) - On this page / på denna sida - Second part - IX. Mining Industry and Metal Production - 2. The Iron and Steel Industry. By the late Prof. J. G. Wiborgh - Ingot iron (Steel)
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736-
ix. mining indUstry and metal production op sweden.
Steam Hammer, Sandviken.
In order to produce such a pig iron containing a high percentage of
manganese and a small percentage of silicon, a rather basic blast furnace slag is
required, the basicity of which generally varies from 1*5 silica to nearly
singnlo-silicate. But as a basic blast furnace slag is not very fusible, the temperature in
a blast furnace must be higher than when, for inst., a Lancashire pig iron is
blown, wherefore more charcoal is consumed, and, as a consequence, the Bessemer
pig iron costs more to produce. The iron hereby, however, becomes considerably
hotter, and this excess of heat afterwards proves of great advantage in the
Bessemer furnace; for as it is chiefly the silicon in the iron when oxidizing which
produces the heat necessary for the process (also manganese but in a less degree), the
process could with such a small amount of silicon in the iron, generally nnder 1 y
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