2451 results about "Molten slag" patented technology

A method of making metallic iron in which a compact, containing iron oxide such as iron ore or the like and a carbonaceous reductant such as coal or the like, is used as material, and the iron oxide is reduced through the application of heat, thereby making metallic iron. In the course of this reduction, a shell composed of metallic iron is generated and grown on the surface of the compact, and slag aggregates inside the shell. This reduction continues until substantially no iron oxide is present within the metallic iron shell. Subsequently, heating is further performed to melt the metallic iron and slag. Molten metallic iron and molten slag are separated one from the other, thereby obtaining metallic iron with a relatively high metallization ratio. Through the employment of an apparatus for making metallic iron of the present invention, the above-described method is efficiently carried out, and metallic iron having a high iron purity can be made continuously as well as productively not only from iron oxide having a high iron content but also from iron oxide having a relatively low iron content.

Method capable of preparing silicon having purity of about 6N applied to a solar cell efficiently at a low cost. Raw silicon containing boron and a slag are melted and a shaft is rotated by a rotating/driving mechanism for stirring the molten silicon. The molten slag is dispersed in the molten silicon, thereby accelerating the boron removal reaction. It is further effective to use a slag containing at least 45 percent by mass of silicon oxide or to blow gas mixed with water vapor into the molten silicon for refining reaction.

PCT No. PCT/AT97/00201 Sec. 371 Date May 15, 1998 Sec. 102(e) Date May 15, 1998 PCT Filed Sep. 12, 1997 PCT Pub. No. WO98/12359 PCT Pub. Date Mar. 26, 1998In a process for working up combustion residues and slags from waste incineration plants or steel works slags, the slag is charged at a slag layer height of above 1.2 m into a converter (1), in which the molten slag is reacted with a metal bath (4) through which oxygen is blown. The oxygen is introduced into the bath (4) for cooling the submerged tuyeres (7, 8) in the form of air or along with CO2 or water vapor.

The invention relates to a combustible material plasma high-temperature gasification technique and equipment thereof. The technique comprises the following steps: firstly, laying a coke bed layer at the bottom part of a gasification furnace; secondly, putting the combustible material, a fluxing agent and an extra coke on the coke bed layer continuously to form a fuel bed layer; then injecting a primary oxidizing agent, starting a first-stage plasma torch to generate high temperature and high heat, forming a fusing zone at the joint of the coke bed layer and the fuel bed layer, forming a gasifying zone above the fusion zone, gasifying the combustible material to generate crude synthesis gas, and discharging the generated fused slag from the bottom part of the gasification furnace; then introducing the crude synthesis gas into a gas-solid separator for removing impurities to obtain purified synthesis gas; and finally introducing the purified synthesis gas into a detarrer, injecting a secondary oxidizing agent, starting a second-stage plasma torch to generate high temperature and high heat, cracking residual tar therein to obtain fined synthesis gas. The equipment mainly comprises three parts, namely the gasification furnace, the gas-solid separator and the detarrer. The fuel has good adaptability, high gasification efficiency, few tar content in the synthesis gas and high activeingredient.

The invention relates to the field of energy recovery utilization and in particular to a molten blast furnace slag sensible heat recovery method and a device; the method is characterized in that: themolten blast furnace slag carries out a first heat recovery in a granulator, and then a second heat recovery is carried out by a vibrated bed, and then a third heat recovery is carried out in a fluidized bed, and the reclaimed heat energy is reutilized or converted in a hot air or power generating way; the realization steps are that: 1) the molten blast furnace slag is arranged in the granulator for granulation; 2) the blast furnace slag granules carry out heat exchange in the vibrated bed; 3) the blast furnace slag granules carry out heat exchange in the fluidized bed; 4) after heat exchangeis carried out, the heat is used for power generation from air or is directly utilized in a hot wind way. The method has the beneficial effects that: the sensible heat of the molten blast furnace slagis utilized respectively in a way of waste heat stream power generation and in a way of blast furnace hot wind, compared with the existing water quenching method, 1.0-1.2t of fresh water can be savedwhen processing 1t of molten slag, and sulfides H2S and SO2 are not produced, and energy equivalent to 47kg of standard coal is saved.

The invention discloses a process method for cooperatively and continuously processing waste containing iron and/or zinc, lead, copper and tin, and the like and molten steel slag on line, separating and recycling metal such as iron, zinc, lead, copper and tin as well as molten slag. The cooperative processing and recycling method is characterized in that pellets prepared from waste containing iron, zinc, lead, copper, tin and the like, particles, a blocky material containing iron, zinc, lead, copper, tin and the like and high-temperature molten steel slag are added into a reducing, volatilizing and smelting furnace, molten iron, which is obtained by air-blowing, adding of fuels such as coal gangues and flux such as high silicon and high aluminum, high-temperature reducing and volatilizingtreatment, is discharged from an iron outlet of the reducing, volatilizing and smelting furnace; volatilized substances such as zinc and lead and smoke gas are sucked into a dust collector for being collected and utilized; enriched metal such as gold, silver, copper, tin and lead is discharged from a discharge hole in the bottommost part of the reducing, volatilizing and smelting furnace for beingrecycled; and molten slag is discharged through a slag outlet, water slag and the like or the molten slag is returned into a converter for being recycled. Waste containing iron, zinc, lead, copper, tin and the like, molten steel slag and coal gangue waste slag and the like are cooperatively and continuously treated to separate and recycle useful metal, so that remarkable energy-saving environment-friendly social benefits and economic benefits are achieved.

The invention relates to an anti-sticking daubing material applied in steelmaking as well as the preparation method thereof, and is characterized in that the daubing material is composed of the following components by weight percentages as follows: 65 to 80 percent of 0 to 3 mm waste magnesia-carbon brick powder, 10 to 30 percent of waste magnesia-carbon brick powder, 5 to 30 percent of fused magnesia powder, 1 to 4 percent of fine silica powder, 1 to 4 percent of fine Alpha-Al2O3 powder, 0.1 to 1 percent of sodium hexameta phosphate, 0.1 to 0.8 percent of calcium lignosulfonat and 1 to 5 percent of soft clay. The daubing material can prevent the penetration of molten slag by utilizing the lubricating property of graphite in the waste magnesia-carbon bricks, and the slag is not easy to be hung on the surface, thereby not only effectively utilizing the waste magnesia-carbon bricks, but also prolonging the service life and reducing the cost.

The invention provides a process technology for granulating blast-furnace slag and utilizing waste heat. The process technology is characterized by comprising the following steps of: performing primary cooling and triple granulation on high-temperature molten slag from a blast furnace in a slag primary cooling device to form fine granules with diameter of less than 3mm and temperature of about 800-1,000 DEG C; discharging the fine granules through a high-temperature slag discharge valve; entering a slag basket and conveying to the upper part of a slag secondary cooling device; falling to the lower part of the slag secondary cooling device along a plurality of layers of baffle heat exchange components which are arranged in the slag secondary cooling device; and cooling to about 200 DEG C and discharging through a low-temperature slag discharging valve, wherein waste heat of normal pressure steam of 200 DEG C can be recovered by the slag primary cooling device; and waste heat of hot circulating air of over 600 DEG C can be recovered by the slag secondary cooling device. The invention provides equipment for granulating blast-furnace slag and utilizing waste heat. The equipment mainlycomprises the slag primary cooling device, the slag secondary cooling device, a waste heat boiler and the like. The process technology and the equipment have the advantages of good granulation effectof the molten slag, small and uniform size of slag granules, almost zero new water consumption and low environmental pollution.

The invention discloses a melting solidification integrated method and a melting solidification integrated system for the incineration of hazardous wastes and incinerated fly ash. The method comprises the following steps of: incinerating and melting the hazardous wastes by using a multi-section incinerator which consists of a slag rotary kiln and a secondary combustion chamber; recovering the heat of smoke generated during incineration by using an afterheat boiler; conveying fly ash collected by a bag-type dust collector to the slag rotary kiln by using a silo pump and a fly ash return pipeline; performing compatibility on the fly ash and medical wastes, so that the fly ash is melted at a high temperature in the slag rotary kiln; and performing water quenching to form vitreous slag, and wrapping heavy metal by using the slag to realize the stable solidification of the metal. In the method, heat energy generated by combusting the hazardous wastes is utilized fully to provide energy for the melting solidification of the fly ash, the problem of high cost of stabilization treatment of the fly ash is solved while the innocent treatment of the hazardous wastes is realized, running cost is reduced, and the important effects of energy conservation, emission reduction and waste control by the wastes are achieved; and due to the adoption of an integrated design, the integrated system is reasonably and compactly connected and has a mature equipment structure and higher economy.

Flux compositions adapted for use in laser welding, repair and additive manufacturing applications. Flux compositions contain 5 to 60 percent by weight of an optically transmissive constituent, 10 to 70 percent by weight of a viscosity/fluidity enhancer, 0 to 40 percent by weight of a shielding agent, 5 to 30 percent by weight of a scavenging agent, and 0 to 7 percent by weight of a vectoring agent, in which the percentages are relative to a total weight of the flux composition. Also disclosed are processes involving melting of a superalloy material in the presence of a disclosed flux composition to form a melt pool covered by a layer of molten slag, and allowing the melt pool and the molten slag to cool and solidify to form a superalloy layer covered by a layer of solid slag.

The invention discloses a technique for comprehensively utilizing iron-containing dust mud, which is characterized by comprising the following steps: preparing iron-containing dust mud into blocks or balls by block pressing, ball pressing or balling, drying the ball or blocky red mud, adding the red mud into a rotary hearth furnace, carrying out ZnO removal, alkali metal removal and FeOx pre-reduction on the dust mud in the rotary hearth furnace technique, recovering ZnO from rotary hearth furnace flue gas, and pre-reducing to obtain the metalized pellet DRI; and adding the DRI generated from the rotary hearth furnace into a melting furnace to perform slag-iron separation, sending the separated molten iron into a steelmaking technique, and carrying out concurrent heating hardening and tempering on the dust mud molten slag separated from the metal, wherein the product can be used for producing cement, mineral wool, microcrystalline glass or other high-added-value silicate products. Thus, the technique enhances the comprehensive utilization efficiency of the whole iron-containing dust mud, and enhances the comprehensive utilization economic benefit of the iron-containing dust mud.

The invention relates to an abrasion-resisting surfacing flux-cored wire for a coal milling roller, which is composed of high carbon ferro chrome 45-65%, chromium carbide 8-20%, chromium metal 5-15%, flake graphite 3-8%, high carbon ferromanganese 3-6%, 75# ferrosilicon 5-7%, ferroboron 5-15%, aluminum magnesium alloy 2-5% and an agglutinant 2-8%. The diameter of a welding wire is phi 3.2-phi 4.0mm, welding wire metal is a low carbon steel strip, and 49%-53% of cored powder by mass is filled in the formed low carbon steel strip. No protective gas is additionally arranged outside the flux-cored wire, and the manufacturability is good in the self protection open arc welding. During the welding, the arc is stable, the spatter lose rate is low, molten slag is little, the welding can be continuously performed, the welding joint is attractive in forming, the self-protection effect is good, and no air holes is on the surface of the flux-cored wire. The hardness of the abrasion-resisting surfacing flux-cored wire for the coal milling roller reaches above 62 HRC after multilayer surfacing by metal piling, the evenness of the whole hardness is +/-2HRC, and the performance resistant to abrasion of low-stress grinding materials is good.

This invention relates to carbon pellets as raw materials smelting reduction ironmaking field. This invention cured composite melting reduction in carbon pellets as raw materials and coal as fuel and reducing agent eventually reinstated. By-baking furnace melting reduction, intermediate storage melt furnace, furnace and eventually reducing coal burning furnace components Cyclones circulatory system. Complex carbon pellets melt-in-baking furnace oxidation reduction carried out in an atmosphere baking heat, the ball nuclear direct reduction, iron oxide pellets outer indirect reduction and then the process of melting, and other pre-reduction. After the first hot the metal from the furnace slag into the final reduction. The final reduction furnace combustion gases into the secondary combustion furnace coal Cyclones with input by the combustion of pulverized coal-baking furnace melting reduction heating.

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 relates to a liquid continuous slag-removal fixed bed gasification furnace and a gasification method thereof, the liquid continuous slag-removal fixed bed gasification furnace is characterized in that: the liquid continuous slag-removal fixed bed gasification furnace from top to bottom in turn comprises a raw material bin, a material lock hopper, a furnace body, a plurality of gasification agent nozzles, a slag-removal device, a molten slag quenching chamber and a slag lock; the raw material bin is funnel-shaped, the lower end of the raw material bin is in fastening connection with the upper end of the raw material lock hopper; the raw material lock hopper is in fastening connection with an upper end port of the furnace body, the upper part of the furnace body is provided with a crude gas outlet, the furnace body inner wall located below the crude gas outlet is provided with a layer of furnace lining; the plurality of gasification agent nozzles are in fastening connection with the lower part of the furnace body and are arranged uniformly along the circumferential direction of the furnace body, the outlet of each gasification agent nozzle passes through the furnace body furnace wall and the furnace lining and extends into the furnace body; the slag-removal device is installed in the furnace body located below the furnace lining, the lower end of the furnace body is in fastening connection with the upper end of the molten slag quenching chamber, and the lower end of the molten slag quenching chamber is in fastening connection with the upper end of the slag lock. The gasification agent nozzles adopt a single channel structure only conveying a gasifying agent, the service life of the gasification agent nozzles is improved, and an overflow type slag pool can effectively ensure the smooth slag removal, and improves the operation efficiency of the fixed bed molten slag gasification furnace.

The invention relates to a refractory and mainly provides a non-carbon residue feather edge brick for a refining steel ladle and a preparation method thereof. The non-carbon residue feather edge brick is formed by taking corundum grains, electrofused spinel grains and electrofused magnesia grains as aggregate, taking corundum fine powder, high-temperature alumina micropowder, electrofused magnesia, chromium sesquioxide, aluminum metal powder and other powders as base components and adopting a mode of compounding and adding inorganic and organic bonding agents and a mode of machine pressing. The obtained non-carbon residue feather edge brick has the advantages of high strength of generated blanks, no firing, favorable thermal shock stability, strong capability of resisting acid and alkali molten slag, no pollution on molten steel and the like and can be applied to residue line parts of the steel ladle under the conditions of RH and specified LF/VD refining.

The invention discloses a surfacing electrode for repairing a hot forged mould, which uses a low-carbon steel H08A core wire conforming to the GB/T3429 requirement. The solid component quality content of coating is as follows: 30-40% of marble, 12-20% of fluorite, 1.5-3% of zircon sand, 0-2% of soda ash, 2-5% of silicon epitaxy material, 1-3% of titanium white, 0-3% of flogopite, 1-2% of rare earth fluoride, 3-7% of manganese metal, 2-5% of ferrosilicon, 4-6% of ferrotitanium, 4-8% of chromium metal, 4-8% of ferromolybdenum, 6-12% of metallic nickel and 1-2% of aluminium magnesium alloy. The invention has favorable welding rod performance, smooth welding rod surface, high yield and stable eccentricity; electric arc is easy to ignite and is stable to burn; coating is even to melt, a welding line is attractive in shape, and slag is easy to clean; and a deposition metal weld metal buildup has moderate welding state hardness which reaches the requirements of the hot forged mould, thus improving the service life cycle of the hot forged mould.

The invention belongs to the field of metallurgy, and in particular relates to a method for separating titanium, iron, vanadium and calcium from mixed titaniferous slag. The method comprises the following steps of: sufficiently mixing blast furnace liquid molten titaniferous blast furnace slag and converter vanadium-containing steel slag flowing out from slag discharge holes, so as to form mixed molten slag, blowing an oxidization gas into a mixed molten body, after the gas blowing is accomplished, naturally cooling down the molten slag, manually taking out the vanadium-containing metal iron which is settled to the bottom of the molten slag, further separating the rest vanadium-containing metal iron in a magnetic separation mode, and finally separating titaniferous ingredients in the molten slag from gangue phase by using a gravity separation method so as to obtain titanium concentrate and tailings the main phases which are perovskite phases, wherein the mass percentage of TiO2 in the titanium concentrate is 35-50%. According to the method, the physical thermal resource of the molten slag is sufficiently utilized, the efficiency is high, the energy is saved, and meanwhile the titanium ingredient, the iron ingredient, the vanadium ingredient and the free calcium oxide ingredient in the mixed molten slag are recycled, so that the purpose of comprehensive high-efficiency recycling on secondary resource is achieved.

The invention relates to a method for additionally adding an electric field in a ladle furnace to deoxidate and refine without pollution and a device of the method, which belong to the technical field of the refining technology. The method is characterized in that the method comprises: additionally adding the electric field between molten steel or molten metal and molten slag in the ladle furnace, taking the molten slag as a channel which transmits dissolved oxygen in the molten steel or the molten metal outwards, applying a direct current pulse electric field between the molten steel or the molten metal and the molten slag which is on the molten steel or the molten metal, controlling the transmitting direction and the speed of oxygen atoms from a system between the molten steel or the molten metal and the molten slag, simultaneously reinforcing the mass transfer process of the dissolved oxygen in the molten steel or the molten metal, and thereby realizing deoxidation of the molten steel or the molten metal without pollution. The invention has the advantages of simple technology, convenient operation, rapid and effective deoxidation and the like.

The invention relates to technology of metallurgical slag processing, in particular to a technological method of ladle slag thermal processing. The technological method of the ladle slag thermal processing comprises the following steps that: ladle molten slag enters a roller slag falling area from a funnel, the slag falling area is provided with a steel ball inside, the steel ball rotates with a roller, the molten slag is cooled by the steel ball, the heat of molten steel and the slag is quickly taken by the steel ball, the molten steel and the slag are taken to a water cooling area by the rolling steel ball after being plasticized and solidified, the molten slag and the steel ball are synchronously cooled by water and then discharged to an outer roller body through a lattice type grate bar of the roller, and the molten slag is cooled again by water in the outer roller body and discharged out finally, wherein the slag and steel are separated under the action of the steel ball rolling at a high speed. The technological method can safely, environmentally and rapidly process the high-temperature ladle slag, can achieve the separation of the slag and the steel, and can solve the problem of processing the ladle slag.