| 摘要 |
<p>PURPOSE:To inexpensively produce a molten Cr iron at a good yield of Cr by blowing powdery Cr ore and steel making slag contg. Cr ore as a slag forming agent into a shaft furnace having two stages of tuyeres in an upper raw material charging port and lower part from the upper tuyeres in the stage of producing the molten Cr iron with said furnace. CONSTITUTION:Lumped high-carbon Fe-Cr, steel scrap, etc., coke 11, and slag forming agent 12 such as lime are thrown into the shaft furnace from the upper raw material charging port 1. The hot air enriched with oxygen by a hot stove 4 and an oxygen source 5 is blown from two stages of the lower tuyeres 2, 3 into the furnace; at the same time, the powdery Cr ore 15 and the steel mak ing slag powder 24 contg. Cr ore formed by adding the powdery Cr ore 15 to molten slag 20 formed in the refining stage of a stainless steel and steel, melting the mixture, solidifying 22 the melt and pulverizing the same with a ball mill 23, as the powder slag forming agent 16 are charged into the furnace from the upper tuyeres 2. The molten Cr iron 18 as the raw material for the stainless steel is inexpensively produced at the high yield of Cr without using costly electric power as a heat source.</p> |
