583results about "Discharge devices" patented technology

An apparatus for filtering molten metal held in a vessel before the metal enters the dosing tube. The filtering apparatus includes an attachment portion that mounts to the dosing tube, a filter body connected to the attachment portion and a planar surface attached to an end of the filter body opposite the attachment portion. The filter body can include a beveled end opposite the attachment portion where the planar surface is attached. The apparatus can be made from a bonded-particle material made from silicon carbide or aluminum oxide held together by an aluminum-resistant binder.

A quiescent melt handling system includes a holding furnace (2, 120, 320-720) for a molten metal melt. The holding furnace has a relatively large surface area and a relatively shallow depth, having a width to depth ratio in the range of 4-100 to 1. Also provided is structure (650-680) in the holding furnace for separating inclusions from the melt in the holding furnace. A quiescent transfer casting method includes melting a metal to form a melt and transferring the melt into a holding furnace. A hydrogen content in the melt is passively equilibrated with a dry atmosphere maintained in the holding furnace. Subsequently, the melt is withdrawn from the holding furnace.

Exemplary embodiments of the invention provide a molten metal containment structure including a refractory molten metal containment vessel having an external surface, and a metal casing for the vessel having an internal surface at least partially surrounding the external surface of the vessel at a distance therefrom forming a spacing between the vessel and the casing. The spacing includes an unobstructed upwardly extending gap that is vented to the exterior of the structure by upper and lower openings in the casing. A layer of insulating material is preferably positioned in the spacing between the internal surface of the casing and the external surface of the vessel, with the layer of insulating material being narrower than the spacing at least at upwardly extending sides of the casing, thereby forming the unobstructed gap. The vessel may be a metal conveying trough, a housing for a metal filter, a container for a metal degasser unit, a crucible, or the like.

The invention relates to an explosion-proof iron runner castable which comprises the following raw materials in percentage by weight: 55-80 percent of fusion tabular corundum, 10-30 percent of silicon carbide, 1-5 percent of soft clay, 2-5 percent of pure calcium aluminate cement, 1-7 percent of submicron powder, 0.5-1.5 percent of explosion-proof agent and 0.05-0.15 percent of water reducing agent, wherein the explosion-proof agent is a mixture of aluminum powder, aluminum lactate, explosion-proof fiber and boron carbide powder with the weight ratio of 1-2:2.5-4:1-2.5:2-4. The castable of the invention has no cracks after demoulding and drying and no spalling during baking, has the safe explosion-proof temperature of 800 DEG C increased from 500 DEG C, can be subjected to construction under heat state and rapid temperature rise without spalling and can meet the operating requirements of rapid construction of middle and small size blast furnace iron runner. The castable has long service life, can improve the environment of a casting house, greatly reduces the labor intensity of the workers, improves the quality of molten iron and enhances the application safety factor of the iron runner.

A method for separating inclusions from an electrically conductive liquid flow using electromagnetic forces, wherein the inclusions and the liquid have differing electrical conductivities. The flow is exposed to a spatially heterogeneous magnetic flux produced by a continuous static magnetic field.

The invention relates to an Al2O3-MA-SiC-C refractory castable material with carbon wrapped by nano Al2O3-SiC film or nano Al2O3-MgO film, and a preparation method thereof. The preparation method of the nano carbon-containing castable material comprises: preparing carbon-containing sol suspension with Al(OH)3-SiC or Al(OH)3-Mg(OH)2 through a high-speed impact mixer, coating the carbon-containing sol suspension on the surface of carbon powder to form a compact carbon wrapping layer with complete coverage and no crack, and carrying in-situ synthesis of nano gel particles of Al2O3 and SiC or Al2O3 and MgO generated during transformation from sol to gel so as to generate a nano-sized matrix with carbon-containing nano secondary spinellite, Al2O3 and SiC as main crystalline phases, thereby completing the preparation of the Al2O3-MA-SiC-C refractory castable material made of nano material. The castable material has particularly excellent resistance against erosion and scouring of molten iron slag, and can satisfy the requirements for use in the iron tapping channel of the modern large-scale blast furnace. Moreover, the invention significantly prolongs the service life, reduces the cost and facilitates the environmental protection.

The invention discloses a waterless tamping for blast furnace tapping comprising 80-120 weight portions of component A and 15-25 weight portions of component B, wherein the component A comprises (by weight portions) brown fused alumina with grain size of 1-3mm 20-40 parts, brown fused alumina powder with grain size <=0.074mm 15-25 parts, kyanite with grain size <=1mm 2-7 parts, SiC with grain size <=0.074mm 8-15 parts, Guangxi clay wash with grain size <=0.088mm 5-20 parts, mica powder with grain size <=0.074mm 5-10 parts, coke with grain size <=2mm 10-20 parts, metallic silicon powder with grain size of 0.044mm 0.5-3 parts, carbon black 0.1-2 parts, the component B being conjugation agent. The waterless tamping has good high-temperature strength and slag erosiveness resistance.

A ceramic capacitor comprises a ceramic sintered body, and first and second terminal electrodes formed on outer surfaces of the ceramic sintered body. The first terminal electrode is electrically connected to a land formed on a substrate through a first metal terminal. The first metal terminal has a first capacitor connecting portion mechanically connected to the first terminal electrode, a first terminal portion mechanically connected to the land, and a first intermediate portion electrically connecting the first capacitor connecting portion and the first terminal portion to each other. The first capacitor connecting portion of the first metal terminal is parallel to the substrate.

There is provided a method and apparatus for removing liquid salts from liquid metal utilizing at least one porous substrate which is wettable by liquid salts and is not wettable by liquid metal. The porous substrate is inserted into a container having a quantity of liquid metal which is contaminated with an amount of liquid salt. The salt contaminated liquid metal contacts the substrate so that the liquid salt is absorbed into the porous substrate. The salt wetted porous substrate is then removed from the container.

A trough is described for carrying molten metal, comprising an outer shell defined by a bottom wall and two side walls, an insulating layer filling the outer shell and a conductive U-shaped refractory trough body for carrying molten metal, the trough body being embedded in the insulating layer. At least one heating element is positioned in the insulating layer, adjacent to but spaced apart from the trough body, to provide an air gap between the heating element and the trough body.

This invention relates to a bake-free casting material and method for casting the lining of iron runner in a blast furnace. The method comprises: cleaning residues at the bottom of the iron runner of a blast furnace, supplying a mold, stirring the bake-free casting material slurry, pouring into the mold, tamping with an insertion-type vibration stick to discharge bubbles and obtain compact casting material. The casting material is suitable for casting the lining of iron runner in a 1000 m3 or lower blast furnace with a single iron outlet, and the obtained lining of iron runner can be directly used for discharging molten iron after hardened without being baked. By the method, the lining of iron runner has compact surface and inside, so the iron runner has a long service life. The method has such advantages as low material consumption, low cost, few waste residues and low labor intensity.

The invention belongs to the technical field of iron groove smashing and hitting materials, in particular to a smashing and hitting material for a blast furnace iron outlet groove. The smashing and hitting material for the blast furnace iron outlet groove is prepared by the following materials according to part by weight: alumina 50-78 shares, plasticity agent 3-7 shares, swelling agent 3-6 shares, carborundum 8-12 shares, brown fused alumina 4-12 shares, graphite 4-8 shares, metallic silicon 2-4 shares and phenol resin 6-10 shares. The smashing and hitting material for the blast furnace iron outlet groove is tried through a blast furnace iron outlet groove, the primary iron passing amount is more than 160 thousand tons, and the using effect is better than the precast members or casting materials in the prior art.

A process for preparing Al2O3-SiC-C refractory used for the tapping runner of blast furnace includes proportionally mixing electro-corundum, SiC, corundum powder, superfine powder, high-Al cement, silicon nitride, metallic silicon, disperser and water, casting, curing and drying.

The invention discloses a single iron-port blast furnace tapping main channel gunning material and a gunning technology, comprising the components with the weight percentages as follows: 44 to 52 percent of brown aluminum oxide or dense aluminum oxide, 24 to 32 percent of 98 silicon carbide, 6 to 12 percent of white aluminum oxide, 6 to 12 percent of Alpha-Al2O3, 1 to 3 percent of silicon powder, 1 to 4 percent of pure calcium aluminate cement, 1 to 4 percent of spherical asphaltum, and 1.5 to 3.5 percent of complex additive. The gunning material is prepared according to the material mixture ratio; compressed air is connected to a gunning machine; the gunning machine is connected with a hose used for a sponging gun; the sponging gun is connected with a tap water pipe and a regulating valve; the inner diameter of the sponging gun is about 4-6cm; the pressure of the compressed air is controlled to be about 0.7MPa; the gunning material is added; the compressed air is used for spraying the gunning material and water mixed in the sponging gun to the part of the tapping main channel needing to be gunned; and the water pressure can be regulated by the water valve on the sponging gun during gunning. The single iron-port blast furnace tapping main channel gunning material and the gunning technology not only can ensure the performances of erosion resistance, oxidization resistance and slag attack resistance and the like after repair, but also can be quickly executed to ensure the smooth use of the single iron-port blast furnace tapping main channel after improvement.

A solder recovery device includes a melter which melts solder dross stored in a melting crucible, an agitation unit which agitates the melted solder dross, so as to separate the melted solder dross up and down into an oxidized residue and a recycled solder in the melting crucible, and a suction unit which sucks the oxidized residue generated by the agitation, the suction unit sucking the oxidized residue in an upper portion of the melting crucible to be removed.

The invention provides a baking free iron groove tamping material containing ferrum silicon nitride which comprises aluminium silicate material, silicon carbide, carbon material, ferrum silicon nitride and bonding agent, their weight portions are, aluminium silicate material 43-80%, silicon carbide 7-25%, carbon material 2-10%, ferrum silicon nitride 5-15%, Si powder 0-4%, Al powder 0-3%, and phenolic resin 2-7%. The invention realizes increased tamping material high-temperature strength, high temperature molten slag erodibility resistance and penetrability, and improved material oxidation resistance property.

The present invention relates to a ladle block for use in a bottom of a molten metal ladle. The ladle block reduces the amount of contaminants, particularly slag, exiting the ladle during casting operations. The ladle block includes a floor defining an outlet and sidewalls substantially orthogonal to the floor. The floor and sidewalls define a channel having dimensions of length, width and height. Channel dimensions are determined from the Froude number, which is based at least partially on the casting flow rate.

A sealing apparatus for a slag door of a metallurgical furnace, having a mounting assembly for mounting the apparatus to the furnace, and at least one closure element, moveable from an open position that is exterior of the slag door opening, to a closed position that effectively seals against the slag door and extends into the slag door opening with the rear panel of the closure element(s) being proximally aligned with the interior wall of the furnace. The apparatus may also have at least one wiping component moveable so as to sweep across the lower surface of the slag door to remove obstructions.