PURPOSE: To provide the treating furnace which effectively utilizes the latent heat of the waste gases of a vertical furnace for treating dust and the like within the same furnace so as to additionally lower the cost of the treatment by providing tuyeres for blasting air or high-temp. oxygen-enriched air on the furnace body in the position upper than tuyeres for feeding powder materials into the furnace.
CONSTITUTION: Of the by-products contg. various kinds of valuable metals generated in the process for producing stainless steels, the lumped materials, such as slag, are charged to the furnace 1 from a charging port 2 at the furnace top and the powder materials, such as dust, from the main tuyeres 3, respectively and are respectively and simultaneously treated. The valuable materials existing in the form of oxides are simultaneously reduced to a molten metal. The charging of scrap and alloy iron in combination as the furnace top charge and the simultaneous melting thereof are possible as well. The molten ferrometal which is reusable as the stainless steel base metal is recovered from the above-mentioned byproducts. The latent heat of the waste gases of the furnace is effectively utilized in the furnace 1 by the blasting from the upper tuyeres 12, by which the economical operation is executed with high efficiency.
MARUHASHI SHIGEAKI
FUKUDA TOMIYA
