Abstract

The present invention relates to an ultra-rapid setting mortar composition using rapidly-cooled steelmaking reduced slag powder and electric furnace steelmaking dust and, more specifically, to an ultra-rapid setting mortar composition comprising: rapidly-cooled steelmaking reduced slag powder which is formed by rapidly cooling while scattering electric furnace melting and reducing slag, which is an industrial by-product generated during iron smelting in an ironworks, into microdroplets by injecting high pressure air to the electric furnace melting and reducing slag at a high speed, and then grinding same into powder; and electric furnace steelmaking dust which is industrial waste obtained by collecting, by means of a dust collector, high-temperature dust generated from an electric furnace melting process.

IPC Classes  ?

• C04B 18/14 - Waste materialsRefuse from metallurgical processes
• C04B 28/14 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
• C04B 5/06 - Ingredients, other than water, added to the molten slagTreatment with gases or gas generating material, e.g. to obtain porous slag

Abstract

A process for producing substantially dry slag granules comprises adding a controlled amount of water to a molten stream of slag, and granulating the slag to produce solidified slag comprising substantially dry slag granules and slag wool. An apparatus for producing substantially dry slag granules comprises: (a) an inclined surface having an upper and lower ends for receiving and discharging the stream of slag; (b) a dispersion device at the lower end of the inclined surface for dispersion of the molten slag; (c) one or more water addition devices for adding a controlled amount of water to the molten slag; and (d) a collection area adjacent to the dispersion device for deposition of solidified slag produced by the dispersion. The quantity of slag wool produced by the process and apparatus is less than that which would be produced without the addition of water.

IPC Classes  ?

• C04B 5/02 - GranulatingDehydratingDrying
• C21B 3/06 - Treatment of liquid slag
• C22B 7/04 - Working-up slag

Abstract

The present invention relates to a concrete accelerating agent comprising rapidly cooled steel reducing slag powder, and more specifically to a powder-type accelerating agent comprising rapidly cooled steel reducing slag powder which is added to cement for shotcreting work to accelerate the strength development by means of rapid hardening, the accelerating agent comprising a mixture of sodium carbonate, gypsum, slaked lime, sodium aluminate, a thickener, and rapidly cooled steel reducing slag powder produced by spraying and scattering electric furnace smelting reducing slag, from among by-products generated during steel smelting in a steel mill, with high-pressure and high-speed gas for 5-60 seconds to rapidly cool the smelting reducing slag from 1300-1600 ºC to 40-90 ºC, and then pulverizing to a powder of 3000-12000 cm2/g.

IPC Classes  ?

• C04B 18/14 - Waste materialsRefuse from metallurgical processes
• C04B 14/26 - Carbonates
• C04B 14/04 - Silica-rich materialsSilicates

Abstract

The present invention relates to a rapid-hardening concrete composition for road repair characterized by the use of rapidly cooled steel reducing slag powder instead of cement-type bonding material as the bonding material, and a method for road paving and repairing using concrete utilizing the rapid-hardening concrete composition, the rapidly cooled steel reducing slag powder comprising 10-20 wt% rapidly cooled steel reducing slag powder, 35-45 wt% fine aggregate, 30-40 wt% coarse aggregate, 1-3 wt% latex and 4-6 wt% mixed water. By utilizing rapidly cooled steel reducing slag powder, which is an industrial by-product, as bonding material, rapid-hardening cement-type bonding material can be substituted, carbon discharge during cement production and environmental damage can be reduced, and cost-effectiveness can be improved. Additionally, the rapid-hardening concrete develops compressive strength of 21 MPa or greater within four hours of pouring to minimize curing time, and superb freezing and thawing resistance and waterproof properties have the benefit of extending the lifespan of the concrete pavement.

IPC Classes  ?

• C04B 18/14 - Waste materialsRefuse from metallurgical processes
• C04B 14/04 - Silica-rich materialsSilicates
• E01C 23/00 - Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces

Abstract

The objective of the present invention is to provide a method for stabilizing dephosphorous slag which is produced in the reductive dephosphorization process of stainless steel and iron alloy of carbon steel and manganese, wherein by re-melting the bdephosphorous slag at a high temperature and spraying high pressure air and inert gas onto the slag at a high speed in order to prepare the slag in the granular form of the ceramic state, calcium phosphate (Ca3P2), barium phosphate (Ba3P2), calcium carbide (CaC2), and barium carbide (BaC2,), which are created in the slag, can be immobilized in a molten state in the slag, and also, the slag can be treated harmlessly because it is not degraded in the air at room temperature. The present invention is technically characterized in that the method for stabilizing dephosphorous slag produced in a reductive dephosphorization process includes the steps of: melting dephosphorous slag produced in the reductive dephosphorization process of the stainless steel and iron alloy of carbon steel and manganese into a liquid phase by means of high temperature melting; spraying high pressure air and inert gas onto the molten dephosphorous slag that is in the liquid phase; rapidly cooling the dephosphorous slag by rapidly spraying high pressure air and inert gas; and particulating the rapidly cooled dephosphorous slag into a spheroidal form so as to have the granular form of the ceramic state.

IPC Classes  ?

• C04B 5/00 - Treatment of molten slagArtificial stone from molten slag
• C04B 18/14 - Waste materialsRefuse from metallurgical processes
• C21C 7/00 - Treating molten ferrous alloys, e.g. steel, not covered by groups

Abstract

The present invention relates to a system for drying steelmaking slag using waste heat. The system includes: a slag port; a tundish; a gas nozzle; a cooling fence; a bucket elevator; a sieve screen; a separator; a dryer that receives the waste heat from the separator, dries the slag through heat exchange, transfers the slag to down-line equipment, and transfers the heat exchanged waste heat to a following dust collector; and the dust collector. The system collects the waste heat at a temperature of 150°C to 200°C generated during atomization and removes moisture from the slag using the waste heat, thereby reducing electricity costs and solving environmental pollution problems caused by waste heat.

IPC Classes  ?

• C21B 3/06 - Treatment of liquid slag
• C21B 3/08 - Cooling slag

Abstract

The present invention provides an apparatus for treating reduction slag generated in the secondary refining of a steelmaking process, in which materials such as air, gas, coolant or the like are sprayed at a high speed through a spraying device to the molten reduction slag generated in the secondary refining step of the steelmaking process, thereby easily producing reduction slag fibers and reduction slag balls. The apparatus comprises: a tundish for controlling the flow rate of the reduction slag when the molten reduction slag generated in the secondary refining step and discharged in a predetermined amount is poured into a slag port, transferred, and dropped; a spraying device for scattering the molten reduction slag dropped from the tundish so as to produce reduction slag fiber and balls; a waste-heat recovery device for recovering the high temperature heat generated by the molten reduction slag and reusing the heat; a drying device for drying the reduction slag balls and fibers using the waste heat recovered by the waste-heat recovery device; and a processing device for selecting and grinding the reduction slag fibers and balls produced by the spraying device.

IPC Classes  ?

• C04B 5/00 - Treatment of molten slagArtificial stone from molten slag
• C04B 18/14 - Waste materialsRefuse from metallurgical processes

Abstract

The present invention relates to a reduced slag ball pre-melt flux and to a method for manufacturing same, wherein a reduced slag ball pre-melt flux is manufactured for recycling ladle furnace reduced slag (LF slag), which is a waste product generated from the secondary refining process of a steel mill, by reducing the components of phosphorus (P), sulfur (S), etc. in a ladle furnace process to thereby be easily applied to the manufacture of clean steel. More particularly, the present invention relates to a reduced slag ball pre-melt flux for ladle furnace and to a method for manufacturing same characterized in that melted LF slag is manufactured in a ball shape with spherical particles by dropping melted LF slag from inside a slag pot onto a turn dish and by quenching melted LF slag during said dropping by atomizing high pressure gas from an atomizer nozzle, wherein the reduced slag ball pre-melt flux is characterized in that it uses an LF slag ball containing 12 wt% or less of SiO2, 35 to 66 wt% of CaO, 10 to 40 wt% of Al2O3, 10 wt% or less of MgO, 5 wt% or less of MnO, 10 wt% or less of T-Fe, and 1 wt% or less of TiO2 as main ingredients, and in that it uses an LF slag ball having a spherical shape of 0.9 to 1.0 sphericity, and having a particle size of 5.0 mm or smaller.

IPC Classes  ?

• C08B 5/00 - Preparation of cellulose esters of inorganic acids
• C04B 18/14 - Waste materialsRefuse from metallurgical processes

Abstract

The present invention provides a basic granular fertilizer for modifying soil, which reduces the cost for preparing a fertilizer and contains a useful ingredient for plant cultivation and also protects the environment by modifying soil using reduced slag which is an industrial byproduct generated from steel manufacturing processes, by using reduced slag consisting of 45 to 60 parts by weight of calcium oxide (CaO), 3 to 8 parts by weight of magnesium oxide (MgO), and 5 to 15 parts by weight of silica (SiO2), after passing reduced slag supplied in a melted state during the steel manufacturing process through a dropping process and a cooling process. Also, the present invention provides a method for preparing the basic granular fertilizer using reduced slag comprising the steps of: preparation by obtaining reduced slag in a molten state generated from a steel manufacturing process; forming granules consisting of 45 to 60 parts by weight of CaO, 3 to 8 parts by weight of MgO, and 5 to 15 parts by weight of SiO2 by dropping reduced slag thus prepared at a constant rate or cooling the reduced slag thus prepared at a constant temperature; and selecting a granular fertilizer having homogenous granular size by passing the formed granules of reduced slag through a screen.

IPC Classes  ?

• C05C 7/00 - Fertilisers containing calcium or other cyanamides
• C05D 5/00 - Fertilisers containing magnesium
• C05D 9/00 - Other inorganic fertilisers

Abstract

The present invention relates to a fiber made from quenched slag resulting from smelting reduction, and to a method for manufacturing same. More particularly, the present invention relates to a fiber made from quenched slag resulting from smelting reduction manufactured by dropping melted slag resulting from smelting reduction using a tapping tundish, and quenching the melted slag resulting from smelting reduction by injecting high-pressure gas into the dropped and melted slag resulting from smelting reduction using an atomizer (AP) nozzle while finely separating the slag into the shape of a fiber, as well as to a method for manufacturing same.

IPC Classes  ?

• C21C 5/54 - Processes yielding slags of special composition
• F27D 15/02 - Cooling
• C04B 5/06 - Ingredients, other than water, added to the molten slagTreatment with gases or gas generating material, e.g. to obtain porous slag

Abstract

The present invention relates to a quenched environmentally friendly nickel slag ball using a high-speed gas, to a method for manufacturing same, and to an apparatus for manufacturing same. More particularly, the present invention relates to an environmentally friendly nickel slag ball (also known as an LS ball) having good hardness, to a method for manufacturing same, and to an apparatus for manufacturing same. The method includes dropping molten nickel slag generated during the production of ferronickel, which may be a raw material for stainless steel, through a tundish, spraying a high-speed gas onto the falling molten nickel slag to separate the molten nickel slag into minute liquid droplets, and quenching the minutely separated liquid droplets of molten nickel slag using the high-speed gas spray in ambient atmosphere.

IPC Classes  ?

• C21C 5/54 - Processes yielding slags of special composition
• C04B 18/14 - Waste materialsRefuse from metallurgical processes

Abstract

The present invention relates to a technology for using, as a high-value material, a reducing slag for an electric arc furnace, which until now has been wasted now due to the self-extracting property thereof caused by the high content of free lime (free-CaO) thereof. Particularly, the present invention relates to an ultra-rapidly hardening hydraulic binder, and to a method for preparing same, wherein the ultra-rapidly hardening hydraulic binder is obtained by scattering reducing slag for an electric arc furnace from byproducts generated during an iron refinement process in a steel mill using a high-pressure gas, quenching the slag to room temperature, crushing the quenched slag, and then mixing the reducing slag powders with plaster. More particularly, the present invention relates to an ultra-rapidly hardening hydraulic binder, and to a method for preparing same, which involve using reducing slag powders for an electric arc furnace, wherein said hydraulic binder can be applied to various fields requiring a rapid-hardening property, and can replace Portland cement, as the setting and hardening times thereof can be adjusted by mixing same with plaster.

IPC Classes  ?

• C04B 18/14 - Waste materialsRefuse from metallurgical processes
• C04B 28/08 - Slag cements
• C04B 28/16 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite
• C04B 5/00 - Treatment of molten slagArtificial stone from molten slag

Abstract

There is provided an apparatus for changing sulfur in a liquefied state, produced as a result of a desulfurization operation in an oil refining process, to solid state particles. The apparatus comprises a dropping portion supplied with liquefied sulfur extracted in the oil refining process and allowing the supplied liquefied sulfur to fall into space; a blower portion supplying a cooling fluid; a transfer portion connected to the blower portion and guiding the cooling fluid to be transferred into an area of the dropping portion; and a cooling fluid discharging portion connected to the transfer portion and dispersing the cooling fluid to the falling liquefied sulfur. The apparatus is able to solidify the liquefied sulfur into the sulfur particles of a small size, change the liquefied sulfur to the solid sulfur particles under flexibly applicable conditions according to the liquefied sulfur's state, and reduce treatment processes and processing times.

IPC Classes  ?

• C10G 73/18 - Organic compounds containing sulfur, selenium or tellurium

Abstract

Disclosed herein is a method for stabilizing slag, which is an oxide byproduct generated after completion of refining in a converter process for converting molten iron into molten steel via de-carbonization or in an electric arc furnace process for producing molten steel via melting of scrap iron, during iron/steel making processes, and a novel material produced thereby. More particularly, disclosed is a method for stabilizing and recycling slag, wherein converter slag or electric arc furnace slag, which is difficult to recycle because of free lime (i.e. free calcium oxide (CaO) referring to single-phase CaO) remaining therein after cooling, is subjected to appropriate treatments after completion of converter blowing, thereby restricting generation of free lime, and consequently, minimizing differentiation/ expansion, environmental pollution and instability of slag. The method for stabilizing slag includes allowing molten slag to fall, injecting high-pressure gas to falling molten slag to separate the molten slag into fine droplets, and quenching the fine droplets with the injected gas and surrounding atmosphere.

IPC Classes  ?

• C21C 5/36 - Processes yielding slags of special composition
• C21C 7/00 - Treating molten ferrous alloys, e.g. steel, not covered by groups
• C21C 5/00 - Manufacture of carbon steel, e.g. plain mild steel, medium carbon steel, or cast-steel

Abstract

Provided is a concrete composition containing atomized steelmaking slag balls (also referred to as PS balls). More specifically, the present invention provides a concrete composition containing sand wherein the sand is partially or completely replaced with atomized steelmaking slag balls. The concrete composition of the present invention is comprised of water, cement, coarse aggregates having a particle size of more than 5 mm, fine aggregates having a particle size of less than 5 mm, optional additives, and the balance of other inevitable impurities, wherein the fine aggregates include more than 30% by volume of atomized slag balls.

IPC Classes  ?

• C04B 18/14 - Waste materialsRefuse from metallurgical processes