Abstract: Systems and methods include a computer-implemented method can be used to make drilling tools from new wurtzite boron nitride (w-BN) superhard material. An ultra-high-pressure, high-temperature operation is performed on pure w-BN powder to synthesize w-BN and cubic boron nitride (c-BN) compact having a first size greater than particles of the pure w-BN powder. The ultra-high-pressure, high-temperature operation includes pressurizing the w-BN powder to a pressure of approximately 20 Gigapascal, heating the w-BN powder at a heating rate of 100° C./minute and cooling the w-BN powder at a cooling rate of 50° C./minute. The compact is cut to a second size smaller than the first size using laser cutting tools. The cut compact is bonded metallurgically, mechanically, or both metallurgically and mechanically onto a tool substrate to form the drilling tool.

Abstract: The present invention concerns the use of a magnesium-including compound as binder for producing metallic ore fluxed pellets, in particular iron ore fluxed pellets, said magnesium-including compound comprising semi-hydrated dolime fitting the general formula aCa(OH)2·bMg(OH)2·cMgO, a, b, and c being weight fractions wherein the weight fraction b of Mg(OH)2 is between 0.5 and 19.5 % by weight with respect to the total weight of said semi-hydrated dolime.

Abstract: Examples herein generally relate to sinter blend compositions for use in a sintering process that do not contain coke breeze (0.0% coke breeze), or contain only very small amounts of coke breeze. In particular, these sinter blend compositions are capable of repurposing mixture of iron-making reverts, having high total and metallic iron levels that re-oxidize so as to become a replacement fuel source for the coke breeze typically used in sinter blend compositions for use in a sintering process, while still managing to produce a sinter with sufficient ISO tumble strengths.

Abstract: The present invention concerns a new type of grain refiners for steel, in the form of a particulate composite material, containing a high volume fraction of tailor-made dispersed particles, with the purpose of acting as potent heterogeneous nucleation sites for iron crystals during solidification and subsequent thermo-mechanical treatment of the steel.

Abstract: This invention belongs to ferrous metallurgy field, and in particular relates to a lime-based additive for steel smelting which is used in the electric furnace refining and steel casting process for carbureting and deoxidation and the preparation method thereof. The lime-based additive for steel smelting comprises lime-based material and carbonaceous material, wherein the content of the lime-based material is 40-80 wt % relative to the total amount of the additive, and the remaining is the carbonaceous material; the lime-based material is a passivated CaO powder with a low flowability, or the mixture of the passivated CaO powder and CaCO3 powder, and the carbonaceous material is at least one of the coke, graphite, semi-coke powder and coal with carbon content not less than 85 wt %. When the additive has a shape of pellet, and it further comprises 1-5 wt % of agglomerant which has a microstructure of strip, streak or dendritic, and is at least one of MgO, Al2O3, and CaCO3.

Abstract: The invention relates to a covering agent for a top slag of a metallic melt bath in a metallurgical vessel, in particular used in the steel industry, containing a material which melts on the melt bath and performs metallurgical work, wherein the material substantially comprises granules which have been rendered porous and the porosity of which is such that, at the melt bath temperature, a molten layer of liquid slag is formed on the melt bath, and a thermal barrier layer of the granules is formed above the molten layer of liquid slag. In addition, the invention relates to a process for producing the covering agent and to its use.

Abstract: In a method of producing molten pig iron (13) or molten steel pre-products from charging substances formed of iron ore (4), preferably in the shape of lumps and/or pellets, and optionally of fluxes (5), the charging substances are directly reduced to sponge iron in a reduction zone (2), the sponge iron is charged into a melt-down gasifying zone (12) and, there, is melted under the supply of carbon carriers (10) and an oxygen-containing gas, wherein a CO—H2-containing reducing gas is generated that is withdrawn from the melt-down gasifying zone (12) and introduced into the reduction zone (2), is reacted there and is withdrawn as a topgas, wherein the topgas is subjected to scrubbing and the sludges thus separated are at least partially agglomerated. To utilize the agglomerates thus formed while expending as little energy as possible, the agglomerates are recirculated into the reduction zone (2).

Abstract: A process for producing fired pellets by granulating finely-ground iron ore and subjecting the resulting granules sequentially to drying, dehydration, preheating, and firing, wherein said process comprises adding an additive to said finely-ground iron ore at the time of granulation, said additive reacting with iron ore to form a compound which has a melting point lower than the preheating temperature. Owing to the additive (or sintering auxiliary) added in a small amount to iron ore powder, it is possible to produce preheated pellets by using the existing grate kiln without increasing the amount of preheating energy. The resulting preheated pellets have improved strength and produce no adverse effect on finished pellets.

Abstract: A process for increasing the particles size of fines of a titaniferous mineral containing more that 45% by weight of titanium. The process comprises mixing the fines with a binding agent and water to produce an agglomerate. The agglomerate is then dried and sintered.

Abstract: A synthetic gasket material for use in a high-pressure press includes a major proportion of clay mineral powder having sufficient lubricity to flow in a high-pressure press, a minor proportion of at least one hard material powder having a sufficiently greater hardness than the clay mineral to retard flow of the clay mineral and form a seal during pressing in a high-pressure press, and a sufficient amount of binder to form an integral body. The synthetic gasket material is formed by thoroughly mixing together in desired proportions the clay mineral, hard material, and binder. The mixture is compacted into a body near net geometry and having a desired configuration to facilitate use in the high-pressure press. The compacted body is heated for a sufficient time and at a sufficient temperature to remove non-crystallographic water.

Abstract: A method for manufacturing a powder for sendust core is disclosed which is used in power supplies, converters and invertors, and in which the sendust powder is manufactured by applying the atomizing process, and the powder is coated with a special ceramic mixture insulator, so that the core loss would be small after forming a product. The method for manufacturing the powder for a sendust core includes the steps of: preparing a sendust alloy melt composed of (in wt %) 4-13% of Si, 4-7% of Al, and balance of Fe under an inert atmosphere; spouting water with a pressure of 1500-3500 psi to a flow of said sendust alloy melt through four or more nozzles having a diameter of 10-20 mm, so as to form a relatively regular polyhedral powder; adding 0.1-1.0 wt % of kaoline to the powder, and heat-treating it at a temperature of 700.degree.-850.degree. C. for 30 minutes or more under a reducing atmosphere; and carrying out a wet coating on the heat-treated powder by using 0.

Abstract: A process for agglomerating by extrusion, metallurgical by-products and waste products having small particle size, is described. A blend of metallurgical by-products, some of which contain silicates previously treated at high temperatures and thereby being capable of chemically and structurally binding water, optionally mixed with portland cement and/or slag cement, and containing water which has been added in amounts that the silicates and cement present can completely absorb and react with, is further mixed with a hydrocarbonaceous substance. The resulting mixture is subsequently agglomerated by extrusion. The extrudates obtained are shape retaining and sufficiently hard to be handled without breaking, crumbling or dusting, and may be charged to extractive pyrometallurgical installations for recovering value metals contained in the metallurgical by-products and waste products. The extrudates may also be stored without dusting and loss of hardness.

Abstract: A stable aqueous suspension of a mixture of magnesium hydroxide and copper oxychloride, together with a suspending agent, is used to reduce deposits in kilns or furnaces used to make iron ore agglomerates, known as pellets, during a calcination process in which iron ore fines mixed with fluxing materials having a phosphate content of less than 1% by weight of the total flux and iron ore weight, are heated to from about 900.degree. to about 1400.degree. C. in order to create the hardened iron ore pellets, called flux pellets, one of the chief raw materials in steel making.

Abstract: Disclosed herein is a self-fluxing pellet to be charged into blast furnace, the pellets containing open pores of diameters larger than 5 .mu.m in an amount greater than 0.045 cm.sup.3 /g. Calcium.ferrite structures with a thickness of 100 .mu.m or greater exist around pores of diameters larger than 5 .mu.m including the open pores. The self-fluxing pellets as a whole has a CaO/SiO.sub.2 value higher than 0.8. For forming the self-fluxing pellets, at least one of coarse dolomite and limestone having a particle size of 44 .mu.m-1 mm is added as a pellet material to powdery iron ore. The green pellet formed from the resulting powdery mixture are sintered at a temperature of 1220.degree. C.-1300.degree. C. to have a CaO/SiO.sub.2 value higher than 0.8 after sintering.