Abstract: In a device for melting precrushed material and/or dusts such as, e.g., furnace dusts or steel dusts, marl and lime dust mixtures, shredder light fractions and/or crushed waste substances, in which the material and/or dusts are injected into a combustion chamber along with a carrier gas, the dusts and/or are introduced axially, and the carrier gas is introduced tangentially, into a cyclone 3. The cyclone 3 is connected with a combustion chamber (8) via a substantially axially directed discharge opening (9).

Abstract: In a method for removing chromium oxide and nickel oxide, and combinations thereof, from liquid slags or slag mixtures, in which the liquid slag is A charged onto a metal bath, in particular an iron bath, and reduced by feeding carbon or carbon carriers, the carbon feed into the metal bath is effected until a decrease of the Cr and/or Ni oxide contents of the slag to a value of between 0.8 wt.-% and 0.2 wt.-%. As the pregiven Cr and/or Ni oxide content range of the slag is reached, reductants having higher reduction potentials such as, e.g., Al, Ca, Si, Fe—Si or Ca—Si are added in order to lower the Cr and/or Ni oxide contents to below 0.15 wt.-%, preferably below 0.08 wt.-%.

Abstract: In a method for treating slags or slag mixtures having iron oxide contents of >5 wt.-%, in particular steelworks slags, in which the steel slags optionally mixed with other slags are charged onto a metal bath, a steel bath having a carbon content of <1.5 wt.-%, preferably <0.5 wt.-%, is used as the metal bath and the steel bath, after the charging of the steel slags, is carburized to above 2.0 wt.-% C, preferably >2.5 wt.-% C, by introducing carbon or carbon carriers.

Abstract: In a device for atomizing and granulating liquid oxidic slags such as, e.g., converter slags, blast furnace slags or waste incineration slags, including a slag tundish having an outlet opening into which a height-adjustable lance for a propellant jet opens and to which a cooling chamber is connected, the outlet opening is surrounded by an immersion tube arranged concentrically therewith while forming an annular gap. A guide body capable of being adjusted in the axial direction of the lance is arranged in the region of the nozzle mouth of the propellant jet lance, which guide body deflects the propellant jet in the radial direction.

Abstract: In a method for processing dusts or dust mixtures containing alkalis and heavy metals, such as, e.g., steelworks dusts, fine ores or blast furnace dusts, the dusts are charged onto or into, in particular top-blown on or blown into, a bath of molten metals and liquid oxidic slags. Volatile heavy metal compounds such as, e.g., Zn and/or Pb oxides are separated from the gaseous phase and alkalis are introduced into the slags.

Abstract: In a method for producing puzzolanic or hydraulic grinding additives for the cement industry from basic oxidic slags, in particular steel slags, using a metal bath for the reduction of metal oxides contained in the slags, the basicities of the liquid slags are adjusted to values lying 0.1 to 0.5 below the basicity value (CaO/SiO2) of the target slag prior to the reduction by adding acidic corrective substances such as, e.g., quartz sand and/or blast furnace slag and/or SiO2-containing corrective substances.

Abstract: In a process for producing marl slags and marl slag cements or mixed components for mixed cements from marl having a basicity CaO/SiO2 of <2.0, it is provided that in a first process step argillaceous marl or a mixture of marl and clay having a basicity of <2.0 is dried, preheated and calcined and that, after this, the obtained product in a second process step is melted in a separate melting furnace at higher temperatures than applied in the first process step and is granulated from the melt.

Abstract: In a device for atomizing liquid melts, in particular oxidic slags or glasses, including a slag tundish and an outlet opening into which a lance is immersed to inject gases or vapor while forming an annular gap, the lance (3) is comprised of two coaxial tubes (4, 5) which are separately displaceable in the axial direction and fixable in their respective axially displaced positions.

Abstract: In a method for treating slags or slag mixtures having iron oxide contents of >5 wt. -%, in particular steelworks slags, in which the steel slags optionally mixed with other slags are charged onto a metal bath, a steel bath having a carbon content of <1.5 wt. -%, preferably <0.5 wt. -%, is used as the metal bath and the steel bath, after the charging of the steel slags, is carburized to above 2.0 wt. -% C, preferably >2.5 wt. -% C, by introducing carbon or carbon carriers.

Abstract: In a method for producing puzzolanic or hydraulic grinding additives for the cement industry from basic oxidic'slags, in particular steel slags, using a metal bath for the reduction of metal oxides contained in the slags, the basicities of the liquid slags are adjusted to values lying 0.1 to 0.5 below the basicity value (CaO/SiO2) of the target slag prior to the reduction by adding acidic corrective substances such as, e.g., quartz sand and/or blast furnace slag and/or SiO2-containing corrective substances.

Abstract: In a method for dechroming and/or denickelifying liquid slags or slag mixtures, in which the liquid slag is charged onto a metal bath, in particular an iron bath, and reduced by feeding carbon or carbon carriers, the carbon feed into the metal bath is effected until a decrease of the Cr and/or Ni oxide contents of the slag to a value of between 0.8 wt.-% and 0.2 wt.-%. As the pregiven Cr oxide content range of the slag is reached, reductants having higher reduction potentials such as, e.g., Al, Ca, Si, Fe—Si or Ca—Si are added in order to lower the Cr and/or Ni oxide contents to below 0.15 wt.-%, preferably below 0.08 wt.-%.

Abstract: In a device for atomizing liquid melts, in particular oxidic slags or glasses, including a slag tundish and an outlet opening into which a lance is immersed to inject gases or vapor while forming an annular gap, the lance (3) is comprised of two coaxial tubes (4, 5) which are separately displaceable in the axial direction and fixable in their respective axially displaced positions.

Abstract: In a device for atomizing and granulating liquid oxidic slags such as, e.g., converter slags, blast furnace slags or waste incineration slags, including a slag tundish having an outlet opening into which a height-adjustable lance for a propellant jet opens and to which a cooling chamber is connected, the outlet opening is surrounded by an immersion tube arranged concentrically therewith while forming an annular gap. A guide body capable of being adjusted in the axial direction of the lance is arranged in the region of the nozzle mouth of the propellant jet lance, which guide body deflects the propellant jet in the radial direction. (FIG.

Abstract: In a method for atomizing metal melts, in which the liquid metal bath is sprayed from a tundish via an outlet opening by the aid of a gas into a cooling chamber, or onto a surface to be coated while compacting the comminuted particles by the aid of a propellant gas, the liquid metal melt via an annular gap is introduced into the outlet opening, into which a hot gas having a temperature of between 250° C. and 1300° C. and a supercritical pressure of between 2 and 30 bars is ejected through a Laval nozzle concentrically with said opening. The hot gas is contacted with the melt bath at a speed exceeding supersonic speed, with a radial outwardly directed component or with a twist.

Abstract: A device for atomizing melts, in particular liquid slags, includes a tundish intended to receive the melts and an atomizer head arranged in or on the outlet opening, A cooling chamber for the atomized melt is connected to the atomizer head. The atomizer head is designed as a hot cyclone running into the cooling chamber. Burners and/or propellant gas nozzles are connected to the hot cyclone.

Abstract: The device for atomizing and comminuting liquid melts, including a slag tundish to whose outlet an expansion or cooling chamber is connected, whereby a propellant gas lance opens into the outlet, which propellant gas lance is surrounded by a tubular underflow weir immersed in the liquid slag, is dimensioned such that the width of the gap between the lower edge of the underflow weir and the tundish bottom is smaller than 20%, preferably smaller than 15%, of the clear width of the outlet, that the bottom of the tundish in the region between the lower edge of the overflow weir and the outlet is designed in a funnel-shaped manner, and that supercritical vapor is injected through the propellant gas lance to form an underexpanded free jet in the interior of the melt jet, the flow speed at the nozzle mouth of the lance being adjusted to sonic speed, thus ensuring a substantially enhanced comminution performance.

Abstract: A method for processing steel slags and optionally iron carriers such as, e.g., electric furnace slags, converter slags, dusts derived from steel production, mill scale or secondary metallurgical residues, in which the molten steel slags or iron carriers are supplemented with chromium ores or chromium-containing and/or nickel-containing dusts in order to adjust a slag basicity of 1.2 to 1.6, whereby the bath temperature is maintained at above 1600° C., in particular between 1650° C. and 1800° C., and a carbon-containing iron bath is provided or formed. In addition to environmentally safe slags, a high-grade ferrochromium alloy may be recovered, thus enhancing the economy of the method.

Abstract: A process that produces pozzolanes, synthetic blast furnace slags, belite, or alite clinkers, as well as pig iron alloys, from oxidic liquid slag. The oxidic liquid slag is reduced above an iron bath in a reactor containing submerged tuyeres. Carbon is blown through the submerged tuyeres and into the iron bath to maintain the iron bath at a carbon content of between 2.5 wt % and 4.6 wt %.

Abstract: The invention relates to a method for processing steel slags and iron carriers such as, e.g., electric furnace slags, converter slags, fine ores, dusts from the production of steel and millscale, for recovering pig iron and environmentally safe slags. A molten slag bath and a molten iron bath are used at a volume ratio of between 0.5:1 and 1.5:1 and carbon carriers are introduced into the bath and hot air is top-blown. From the starting slags and iron carriers, a mixed slag having a basicity CaO/SiO2 of between 1.2 and 2.

Abstract: In a process for working up steel slags and iron carriers such as, e.g., electric furnace slags, converter slags, fine ores, dusts from steel production, mill scales for obtaining pig iron and environmentally safe slags, the volume ratio of molten slag to iron bath is chosen to be larger than 0.5 to 1 and, preferably, 0.8:1 to 1.5:1 and the slags are supplemented with SiO2 carriers such as, e.g., foundry sands, metallurgical sands and/or fine ores so as to adjust a slag basicity (CaO/SiO2) of between 1.0 and 1.8 and, preferably, 1.2 and 1.8 at an Al2O3 content of between 10 and 25% by weight, based on the slag. In doing so, hot blast is top-blown and coal, optionally along with an inert gas and, in particular, nitrogen and, furthermore, optionally oxygen or hot air is blown through the iron bath.