Abstract: The heat-treatment apparatus for steel plate has a plurality of transfer rolls for transferring steel plate in the horizontal direction and at least one induction-heating unit for heating the steel plate. The induction-heating unit is positioned between specified adjacent transfer rolls. At least an induction-heating unit located at the most upstream side among the induction-heating units is provided with at least one pressing roll at outlet thereof to press the steel plate from above. At least the pressing roll located at the most upstream side among the pressing rolls is positioned above and facing the transfer roll located at outlet of the induction-heating unit. Owing to the heat-treatment apparatus for the steel plate, desired heat treatment can be given to the steel plate even with the induction-heating unit without adversely affecting the travel of the steel plate.

Abstract: A transformer (57) using exhaust gas heat as a heat source is provided at a fuel supply system (5) of a gas engine (1), wherein the transformer (57) causes a transformational reaction (H2+CO2?CO+H2O) between hydrogen and carbon dioxide, thus changing the composition of the fuel, and this fuel with a changed composition is supplied to a combustion chamber. Furthermore, water vapor is produced by an exhaust heat boiler (52) using exhaust gas heat as a heat source, and this water vapor is supplied to a fuel supply system. Further still, a hydrogen separating device (56) is provided that separates and extracts hydrogen from a fuel, and the fuel is supplied to a combustion chamber after hydrogen is separated and extracted.

Abstract: A transformer (57) using exhaust gas heat as a heat source is provided at a fuel supply system (5) of a gas engine (1), wherein the transformer (57) causes a transformational reaction (H2+CO2→CO+H2O) between hydrogen and carbon dioxide, thus changing the composition of the fuel, and this fuel with a changed composition is supplied to a combustion chamber. Furthermore, water vapor is produced by an exhaust heat boiler (52) using exhaust gas heat as a heat source, and this water vapor is supplied to a fuel supply system. Further still, a hydrogen separating device (56) is provided that separates and extracts hydrogen from a fuel, and the fuel is supplied to a combustion chamber after hydrogen is separated and extracted.

Abstract: In a method of recycling iron and steel industry waste by processing the waste as an object substance by the use of a rotary kiln, the object substance is changed into a valuable material while the object substance travels within the rotary kiln from an upstream side to a downstream side. The object substance is heated on the upstream side of the rotary kiln within a reducing atmosphere to be reduced and molten into a reduced and molten product. The reduced and molten product is quickly sent to the downstream side without being adhered to an internal wall of the rotary kiln. The valuable material is extracted from the reduced and molten product which may be directly discharged out of the rotary kiln or which may be discharged after the reduced and molten product is once kept in a basin formed in the vicinity of the downstream side of the rotary kiln.

Abstract: In an induction furnace including a crucible having a crucible center axis and a coil member wound around the crucible, the coil member has a coil center axis oblique to the crucible center axis at an acute angle between 3.degree. and 10.degree.. The coil member is consequently wound around the crucible so that each winding of the coil member is inclined to the crucible center axis at an angle except 90.degree. and has a highest position and a lowest position on a crucible side wall of the crucible. An inlet port and an outlet port of the crucible are located at positions adjacent to the highest and the lowest positions of the windings, respectively.

Abstract: Disclosed is a method of making capsules of dehydrated sludge which can omit conventionally required unit operations, reduce or eliminate the cost of the equipment and power, heat energy and consumables required for operation, and assures simple operation. The method includes the steps of shaping a steel strip into the form of a channel, supplying sludge into the channel formed in the previous step, shaping the channel formed steel strip with the sludge charged therein such that it has practically a circular cross-section to enclose the sludge, pressing and crushing an outer periphery of a steel tube shaped in the previous step to form a constriction, pressing and cutting the constriction and repeating series of the above-described steps.

Abstract: In a metallic vapor condenser for use in recovering, in the form of liquid metal, metallic vapor of a metal having a medium boiling point, the liquid metal of the molten metal is sent from a splash chamber to be circulated through a skimming sump, a cooling sump, and a casting bath to the splash chamber. The liquid metal is always refreshed by circulation in the casting bath to avoid solidification of the metal. A subsidiary chamber may be coupled to the splash chamber to reverve the liquid metal to decrease dust and dross floating on the liquid metal.

Abstract: There is disclosed a process for recovering valuable metals from a dust containing zinc comprising mixing the dust containing zinc with a reductant and a flux for regulating the basicity of slag, forming the mixture into pellets with a pelletizer, charging the pellets into a shaft type preheating-prereducing furnace provided with a preheating zone at the upper part and with a reducing zone at the lower part and removing, in the preheating zone, moisture and ignition loss components in the pellets, while prereducing in the reducing zone, the pellets under such conditions that a reduction of iron oxide is made to proceed selectively while the reduction of zinc oxide is suppressed to the possible minimum, charging the prereduced pellets into a melting furnace to melt and reduce them in the furnace, separating zinc, or zinc and lead, by evaporation followed by condensation to recover them, and separating iron and lead, or iron, according to the difference in their specific gravities to recover the iron as a molte

Abstract: A furnace system including a main furnace for melting and reducing material to form molten metal and slag which are to be continuously discharged therefrom and provided with an outlet port formed in an upper portion of the side wall thereof, and an auxiliary furnace connected to the main furnace and communicating with the interior of the main furnace through the outlet port. The molten metal and the slag are allowed to continuously flow from the main furnace into the auxiliary furnace while maintaining the melt level in the main furnace above the level of the outlet port so as to seal the outlet port. The molten metal and the slag are discharged from the auxiliary furnace at the same rate as the increase in the amount of the molten metal and the slag in the main furnace. The auxiliary furnace may be provided with temperature control device for independently controlling the temperatures of the molten metal and the slag in the auxiliary furnace.

Abstract: An improved ground-surface-effect winged craft has a main body in the shape of an airfoil, side plates extending nearly vertically at the opposite lateral sides of the main body for intercepting air flowing outwards from the underside of the main body, side plate floats provided at the side plates, a float provided at a central lower portion of the main body, an operator's seat provided on the float, vertical and horizontal tails provided at a rear portion of the main body, and a propelling device for lifting and propelling the airframe of the craft by making use of both a power augment ramwing effect with the horizontal tail and a ground-surface-effect generated between the main body and a flat surface such as a water surface or a ground surface.

Abstract: In a method for producing a reactivity promoted carbonaceous solid reductant used for direct reduction of iron ore by means of an additional alkaline earth metal compound, and improved method wherein the improvement comprises grinding and mixing the carbonaceous solid reductant with the alkaline earth metal compound and agglomerating the resulting mixture to produce the reactivity promoted carbonaceous solid reductant of a definite grain size.

Abstract: A process for recovering valuable metals from an iron dust with a high concentration of zinc comprising (1) pelletizing said dust into a pellet in a pelletizer, (2) preheating the resulting pellets by charging a hot gas to remove water, the loss on ignition and carbonaceous materials contained in the pellets, and in case of need, the conditions of gas charged are set up so as to reduce selectively iron oxide while controlling the reduction of zinc oxide practically at zero level, (3) melting and reducing zinc oxide, iron oxide and lead oxide in said pellets in an induction furnace to separate zinc and a part of lead by vaporization and iron and lead by means of the difference in their specific gravities, and collecting zinc and lead as crude ones, iron as molten pig iron and lead as crude one respectively.

Abstract: A method for recovering zinc from substances containing a zinc compound which comprises supplying a carbonaceous substance and a zinc compound-containing substance onto the hearth layer in a sintering apparatus, vaporizing the zinc compound in said substance as metal to separate the compound therefrom by forming a locally strong reducing atmosphere at the combustion temperature of sintering material, oxidizing the resultant vapor-form zinc into zinc oxide under a strong oxidizing atmosphere, and then discharging the resultant zinc oxide as such from said sintering apparatus.

Abstract: A method for activating a petroleum coke which comprises impregnating the petroleum coke with an aqueous solution or suspension of an alkaline earth metal compound to contain 0.2% or more by weight of the alkaline earth metal compound in the coke.

Abstract: A method is disclosed for temperature control in a heating furnace including a step of regulating the emissivity of the flame in the heating furnace. This regulation is accomplished by adjusting the soot content of the flame. The soot content is changed by introducing auxiliary gaseous fuel, i.e., hydrocarbonaceous material, in addition to the main gaseous fuel, into the heating furnace. A heating furnace temperature control apparatus for carrying out this method is also disclosed.