Abstract: A method for recycling metal scraps, particularly aluminum scraps, is provided. In the method, an amount of metal scrap, particularly aluminum scrap, is provided in the form of a plurality of separated split lots. A composition analysis is carried out for each split lot and an item of composition information based on said composition analysis is associated with each split lot that has been analyzed. Also provided is a device configured for carrying out said method.

Abstract: An environmentally friendly flux for molten steel desulfurization includes CaO and Al2O3 so that [CaO]/[Al2O3] is within a range of 1.6 to 3.0, and includes one or more alkali metal oxides of Na2O, K2O, and Li2O, and SiO2 so that [SiO2]/[R2O] is within a range of 0.1 to 3, [R2O] is within a range of 0.5 mass % to 5 mass %, and [SiO2] is within a range of 0.05 mass % to 15 mass % in a case in which the [CaO], the [Al2O3], the [SiO2], and the [R2O] represent the mass % of CaO, the mass % of Al2O3, the mass % of SiO2, and the total amount of the mass % of Na2O, the mass % of K2O, and the mass % of Li2O respectively.

Abstract: A method of producing a fluxing agent that can be used in production of steel, preferably stainless steel, employs as a raw material a hydroxide sludge that results from neutralization of metal-contaminated pickling liquid from a pickling step for a steel and contains at least one fluoride-containing compound. The hydroxide sludge is calcined. Steel, preferably stainless steel, is produced by decarburizing a steel heat, whereby a slag is formed on top of the steel heat, and adding a fluxing agent to the slag.

Abstract: Provided are self-fluxing pellets for a blast furnace, characterized in that a CaO/SiO2 mass ratio C/S is 0.8 or more and a MgO/SiO2 mass ratio M/S is 0.4 or more; when an iron content (mass %) in the entire pellet is represented by % TFe, % TFe is 65% or less; and a temperature Ts (unit: ° C.) at which the pressure loss starts to increase sharply in a loaded high-temperature reduction test and which is calculated by the equation below is 1290° C. or higher: Ts=110×C/S+100×M/S+25×% TFe?480.

Abstract: Novel iron sulfides having excellent durability and excellent treating properties of heavy metals, processes for producing the iron sulfides, iron sulfide mixture, a heavy metal treating agent containing either of these novel iron sulfides as an effective component, and a method by which wastes containing various heavy metals are treated with the heavy metal treating agent are disclosed. The iron sulfide having a mackinawite structure which contains FeMxNySz wherein M represents an alkaline earth metal, N represents an alkali metal, and x, y and z, indicating the molar proportions of the respective elements, represent numbers satisfying 0.01<x≦0.5, y≦0.2 and 0.7≦z≦1.4, as an essential component.

Abstract: Briquettes for the liquefaction of metallurgical slag are formed from a mixture containing, by weight, 85-98% slag from secondary aluminium processing, 1 to 8% polyvinyl acetate dispersion as the polymeric bonding agent and the remainder water, the briquettes containing water in the form of residue humidity at a quantity of maximally 1.5%, ideally no more than 0.5%, in relation to the overall weight of the briquettes, and the briquettes have a specific weight of 1,500-5,000 kg.m−3 and a compression strength of at least 20 MPa. Ideally, the mixture contains 90-92% slag from secondary aluminium processing, 1 to 3% polyvinyl acetate dispersion and the remainder water. The mixture may also contain 0.5-2% unsaturated acid, selected from the group containing oleic acid and/or palmitic acid and/or stearic acid, as a hydrophobic ingredient. The ideal shape of the briquettes is cylindrical.

Abstract: The tundish flux composition of the invention employs solid recycled ladle metallurgy furnace (LMF) slag as a fluidizing and refining base ingredient in a mixture of raw materials. The preferred recycled LMF slag material comprises about 35% to about 65% CaO, about 10% to about 35% Al2O3, about 1% to about 10% SiO2, about 3% to about 15% MgO, about 0.3% to about 10% FeO, about 0.1% to about 5% MnO, about 0.1% to about 0.15% P2O5, and about 0.1% to about 0.5% S. The tundish flux composition comprises from about 10% to about 80% of recycled LMF slag with the balance being raw materials selected from a calcium oxide source, a fluorine source, a magnesium oxide source, a carbon source, a silica source, a sodium source, a potassium source, and mixtures of these raw materials.

Abstract: A stable aqueous solution comprising a water soluble salt of a magnesium compound, a surfactant and a calcium salt inhibitor is used to reduce deposits in kilns or furnaces used to make iron ore agglomerates, known as pellets, during iron ore calcination.

Abstract: The invention relates to a casting flux for steels or alloys on an iron, nickel or cobalt basis which make heavy demands on the degree of oxidic purity for continuous or ingot casting and contain as the main components calcium oxide (CaO), aluminium oxide (Al.sub.2 O.sub.3) and strontium oxide (SrO), the characterizing feature of the invention being that the chemical composition lies within the following limits (in % by weight):20 to 40% CaO,15 to 30% SrO,0 to 6% Mgo,0 to 8% MgF.sub.2,0 to 8% CaF.sub.2,0 to 8% NaF0 to 6% LiFresidue Al.sub.2 O.sub.3,the flux having a total content not exceeding 15% of oxygen-yielding compounds, such as SiO.sub.2, FeO, MnO, K.sub.2 O, Na.sub.2 O, P.sub.2 O.sub.5, Cr.sub.2 O.sub.3 and B.sub.2 O.sub.3.

Abstract: A method and a mixture for chemically stabilizing electric arc furnace dust (EAFD) by entrapping the metals inherent in EAFD within a cementitiously hardened product from the mixture. The method includes using the pozzolanic characteristics of EAFD and forming a mixture of EAFD with sufficient water and lime, as necessary, and then allowing the mixture to react to form a cementitiously hardened product. The hardened product has acceptable leachate concentrations, permeability characteristics and unconfined compressive strength.

Abstract: Waste materials containing metal oxides and/or metals and their salts are converted to useful products. The waste materials are combined in such proportions that when heated, they form a composite that becomes molten and pourable at temperatures below about 1600.degree. C. Provision is also made for converting some of the metal oxides in the molten material to free metal which is then separated from the molten material. A modified cupola can be used to generate the temperature and reducing conditions suitable for carrying out the process.

Abstract: An improved iron ore sinter for use in a blast furnace is made from a raw sinter mix comprising: iron-bearing materials; basic fluxes including a source of CaO and a source of MgO; and solid carbon-bearing material usually coke breeze, used as a heat-generating combustible. To produce the sinter, the raw sinter mix is subjected to a sintering treatment at a high temperature in order to cause the iron-bearing materials, fluxes and carbon-bearing material to agglomerate and sinter by incipient fusion; an air-cooling treatment in order to produce a hard lumpy substance having a porous cellular structure; and a mechanical treatment to break the lumpy substance into a specific size range. The improvement to the above sinter lies in that the source of MgO in the raw sinter mix exclusively consists of synthetic olivine obtained by calcination of serpentinite.

Abstract: A process for the reduction of iron oxides to produce molten iron in which olivine is introduced into a blast furnace in addition to iron oxide bearing materials and in which there is a high content of alkali metal oxides in the materials charged into the furnace, resulting in minimizing or preventing "scaffolding" and improving the operation of the furnace. The disclosure further includes improvements in which olivine is mixed with iron bearing materials or with coke and such mixture is formed into agglomerates having improved properties and in which such agglomerates are charged into the furnace.