Nippon Kokan Kabushiki Kaisha

Keitaro Hirai

Shuji Kajikawa

Koji Satomi

Yuichi Tsukada

Masaaki Yasunaga

Koichiro Nakano

Tetsuo Izawa

Shinichi Kurosawa

Toshio Mochizuki

The present invention is concerned with a novel furnace top charging apparatus, especially of the bell-less type, having a rotating distribution chute, wherein there is provided a portal truck serving as a stand on a floor under chuting bunkers, which normally supports collecting chutes, and moves them when requested. The collecting chutes have a mouth for mounting a vertical chute at an upper portion between pivots of two swingable sealing valves. These members enable efficient preservation, checking inspection or repair of the collecting chutes, the vertical chute and the rotating chute.

Furnace top charging apparatus

For the purpose of utilizing as a sinter raw material a rolling mill sludge with a grease deposit having a high moisture content, which is deposited in a waste water pit of a steel rolling mill, the moisture content of said rolling mill sludge is reduced to from about 1% to 10% by drying said rolling mill sludge at a temperature of from about 120.degree. C to about 200.degree. C, preferably of about 140.degree. C to about 150.degree. C, with the use of the waste heat of a sinter cooler of a sintering machine, or by mixing said rolling mill sludge with a mill scale of a low moisture content collected without the use of roll cooling water; and then, said rolling mill sludge, the moisture content of which has thus been reduced, is continuously fed, by cutting into substantially equal batches, to at least one of a sinter discharge section, an entry section of said sinter cooler, belt-conveyor for fines return provided adjacent to a hot screen, and a return hopper of said sintering machine; whereby said grease deposit is substantially completely removed through combustion or evaporation with the use of the heat of the sinter produced by said sintering machine.

Method for removing water and grease deposit from rolling mill sludge

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Yokohama, Japan

Keitaro Hirai