Abstract: A gas feed pipe connecting screw for a continuous casting nozzle which is mounted to the continuous casting nozzle formed with an axially extending ring-shaped slit concentric with a nozzle bore. The screw connects the nozzle to a gas feed pipe for blowing a gas into the slit. The screw includes a screw body having a gas feed hole formed through its central portion, a flange fitted into a mounting hole formed in a side wall of the continuous casting nozzle, a male thread engaging a first female thread formed in the mounting hole, and a second female thread formed in the gas feed hole for connection of the gas feed pipe. The flange has a detent corner engaging refractory mortar filling the mounting hole.

Abstract: A liquid treating apparatus includes a treating tank having at least two walls formed with a liquid inlet and a liquid outlet through each of which a liquid to be treated flows, respectively, and a filtering layer unit including an antibacterial filtering layer, an adsorptive filtering layer and a filtering layer, the filtering layer unit being disposed between the liquid inlet and outlet.

Abstract: An antibacterial rockwool growth medium for hydroponics is used for hydroponic growth of rice, flowers and ornamental plants, fruitage, etc. The medium includes a rockwool base used as a culture medium for hydroponics, and an inorganic antibacterial agent is dispersed substantially uniformly onto an overall surface of the rockwool base or a part of the surface of the rockwool base.

Abstract: A liquid treating apparatus includes a treating tank having at least two walls formed with a liquid inlet and a liquid outlet through each of which a liquid to be treated flows, respectively, and a filtering layer unit including an antibacterial filtering layer, an adsorptive filtering layer and a filtering layer, the filtering layer unit being disposed between the liquid inlet and outlet.

Abstract: An antibacterial rockwool growth medium for hydroponics is used for hydroponic growth of rice, flowers and ornamental plants, fruitage, etc. The medium includes a rockwool base used as a culture medium for hydroponics, and an inorganic antibacterial agent is dispersed substantially uniformly onto an overall surface of the rockwool base or a part of the surface of the rockwool base.

Abstract: An exchangeable continuous casting nozzle used for a slide nozzle device connected to an upper nozzle disposed on a bottom portion of a container for molten metal, comprises a nozzle including a flange portion made of a refractory material having a through hole for receiving molten metal flowing out of the upper nozzle, and a tube body of a refractory material having another through hole following the through hole, and a metal protecting body including a metal casing portion surrounding the flange portion, a metal skirt portion surrounding an upper portion of the tube body following the flange portion, and metal reinforcing portions disposed on the slide nozzle device in parallel with a direction to detach/attach the nozzle, for reinforcing junction between the metal casing portion and the metal skirt.

Abstract: A holding structure for a continuous casting long stopper includes a continuous casting long stopper including a shaft insertion hole formed in an upper end thereof, a protrusion insertion groove contiguous to and axially opposed to the shaft insertion hole, and a horizontal engagement groove contiguous to a lower end of the protrusion insertion groove, and a holding rod including a shaft inserted into the shaft insertion hole, the shaft having a lower end on which a radially protruding locking protrusion is formed. In the structure, after the shaft of the holding rod is inserted into the shaft insertion hole such that the locking protrusion reaches the protrusion insertion groove, the locking protrusion is caused to engage the engagement groove by rotation of either the shaft of the holding rod or the long stopper relative to the other.

Abstract: A continuous casting nozzle for casting molten steel, wherein at least a surface layer of an inner bore of the continuous casting nozzle contacting with a molten steel is formed of a refractory comprising: an aggregate consisting essentially of alumina (Al2O3) or an aggregate comprising alumina (A12O3) as its main ingredient and melting point thereof being at least 1800 degree centigrade: from 15 to 60 wt. % and roseki as a balance. The refractory is added thermosetting resin as binder, kneaded, formed, and sintered in an anti-oxidizing atmosphere.

Abstract: A stopper for continuous casting comprising a stopper rod and a spindle for actuating the stopper rod, wherein the stopper rod includes a joining nut integrally formed therewith, an upper end surface of the stopper rod being formed so as to be smooth, and a pin hole being provided in the upper end surface so as to prevent from rotating, while the spindle includes a gas introduction route, a male screw provided in a tip portion thereof for being engaged with the joining nut, a male screw provided in an upper portion thereof for being engaged with a fastening nut for fixing the spindle to the stopper rod, and a flange tightly adhered to the upper end surface of the stopper rod and provided with a hole, into which a pin for preventing rotation is inserted. The spindle is fixed to the stopper rod by the joining nut. The flange is fixed to the upper end surface of the stopper rod by the fastening nut so as to be hermetically sealed.

Abstract: There is provided a continuous casting nozzle comprising a nozzle main body including a neck portion, a middle portion, and a lower portion, made of a refractory material having an inner bore through which molten metal flows, and a plurality of metal bars embedded along the longitudinal direction of the nozzle main body in at least one portion inside the refractory material forming the nozzle main body.

Abstract: A continuous casting nozzle for casting molten steel, wherein at least a surface layer of an inner bore of the continuous casting nozzle contacting with a molten steel is formed of a refractory comprising: an aggregate consisting essentially of zirconia (ZrO2), or comprising zirconia (ZrO2) as its main component and melting point thereof being at least 1750° C.: from 15 to 60 wt. %; and roseki as a balance. The refractory is added to a thermosetting resin as a binder, kneaded, formed, and sintered in an anti-oxidizing atmosphere.

Abstract: A continuous casting nozzle for casting molten steel, wherein the surface layer of the bore of said continuous casting nozzle contacting with the molten steel is formed of a refractory material comprising silicon carbide from 1 to 10 wt %, an aggregate comprising alumina or an aggregate which comprises alumina as main component whose melting point is not less than 1800 degree C. from 15 to 60 wt %, and roseki as a main component from 30 to 84 wt %.

Abstract: The invention is related to a continuous casting nozzle for casting of aluminum killed steel without clogging of the bore of the nozzle. The surface layer of the bore of the continuous casting nozzle contacting with the molten steel is composed of a refractory comprising graphite from 10 to 35 wt %, a neutral or basic aggregate from 30 to 50 wt % such as Al.sub.2 O.sub.3 and pottery stone as the remaining part of the refractory.

Abstract: The present invention relates to a long nozzle used to prevent molten steel flowing out of a collector nozzle of a sliding nozzle from being oxidized by atmospheric air when molten metal, particularly molten steel is poured from a ladle into a tundish. This nozzle has a construction comprising: (a) the long nozzle (3) made of a refractory causes molten metal to flow down from the collector nozzle (2) and the head thereof is covered by a metallic shell (16); (b) a first gas passage is provided to blow inert gas to the vicinity of a fitting portion (7) between the collector nozzle (2) and the long nozzle (3) through a first gas inlet port (8) provided on the side wall of the metallic shell (16); and (c) a second gas passage is provided to blow inert gas into an inner hole (18) of the long nozzle through a second gas inlet port (10) provided on the side wall of the metallic shell (16).

Abstract: The invention is related to a continuous casting nozzle for casting of aluminum killed steel without clogging of the bore of the nozzle. The surface layer of the bore of the continuous casting nozzle contacting with the molten steel is formed of a refractory comprising graphite from 10 to 35 wt % and roseki as the remaining part of the graphite, and the main component of the roseki is pyrophyllite (Al.sub.2 O.sub.3.4SiO.sub.2.H.sub.2 O) as mineral component. Further, silicon carbide from 1 to 10 wt % is contained in the refractory.

Abstract: The object of the present invention is to provide a tundish stopper rod for continuous casting which can be fitted onto a spindle correctly in a short time and which has a sufficiently high degree of heat resistance and mechanical strength to endure its harsh operating conditions.A tundish stopper rod for continuous casting according to the present invention comprises:(a) a stopper rod for regulating the flow rate of molten metal being supported by a spindle and being made of a refractory material, and(b) a nut for attaching the stopper rod onto the spindle, the nut being made of an engineering ceramic material and being embedded in a body of the stopper rod.

Abstract: A nozzle for continuous casting which is capable of uniformly supplying a required amount of gas to the inner wall surface thereof by providing a plurality of communication holes inside the nozzle body between the inner surface thereof and a gas pressure balance chamber disposed inside the nozzle body so as to communicate the chamber with the inner surface, the communication hole having a square measure corresponding to that of a circular hole having a diameter of 1.0 mm or less, and preferably between 0.03 and 0.5 mm. The nozzle body is comprised of a material having 20% or less porosity and containing 50% or more open pores, each having a diameter of 5 .mu.m or less.