Abstract: Proposed is a method for removing phosphorus from a phosphorus-containing substance which is applicable in an industrial scale so as to effectively reduce phosphorus contained in the phosphorus-containing substance. In this method, the phosphorus-containing substance used as a raw material for metal smelting or metal refining is reacted with a nitrogen-containing gas at a treatment temperature T (° C.) which is lower than a melting temperature (Tm) of the substance, so that phosphorus is removed preferably in the form of phosphorus nitride (PN). In this regard, a nitrogen partial pressure and an oxygen partial pressure in the nitrogen-containing gas are preferably controlled, thereby reducing a load of dephosphorization process, for example.

Abstract: Provided is a blast furnace operation method that enables lowering of the reducing agent ratio of a blast furnace. The blast furnace operation method includes injecting pulverized coal through tuyeres of a blast furnace. The method includes adjusting coal containing moisture and volatile matter to form adjusted pulverized coal having a specific surface area within a range of 2 m2/g or more and 1000 m2/g or less, a lower heating value of 27170 kJ/kg or more, and a volatile matter content within a range of 3 mass % or more and 25 mass % or less. The method further includes injecting, through the tuyeres of the blast furnace, pulverized coal in which the adjusted pulverized coal, in a mixing ratio of 10 mass % or more, is mixed.

Abstract: A method for manufacturing an amorphous alloy by using liquid pig iron is described. An exemplary embodiment provides a method for manufacturing an amorphous alloy, including providing liquid pig iron, adding an alloy material to the liquid pig iron, and solidifying the liquid pig iron.

Abstract: The invention relates to a method and device for supersonically injecting oxygen into a furnace, in particular a cupola furnace, in which the total oxygen required for the furnace operation is injected with the aid of two distinct circuits, i.e., the first circuit comprising at least one supersonic oxygen injecting nozzle and a second circuit which comprises additionally oxygen injecting means and is connected to the first circuit by pressure-sensitive means, such as a discharging device (or upstream pressure adjuster), in such a way that a stable pressure is obtained in the first circuit upon the attainment of the maximum flowrate thereof, wherein the first circuit can consists of several supersonic nozzle groups.

Abstract: In a method for producing pig iron using iron ore with a high content of zinc, a blast furnace raw material 2 is produced using iron ore with a high content of zinc which contains 0.01 mass % or more of zinc and 50 mass % or more of iron, pig iron is produced by charging the blast furnace raw material 2 into a blast furnace 1 and, at the same time, zinc-containing dust 4 in a blast furnace discharge gas is recovered, and zinc 6 is recovered from the zinc-containing dust 4 using a reduction furnace 5. A mixed raw material into which the zinc-containing dust 4, a carbonaceous solid reducing material and a slag-making material are mixed is preferably charged on a movable hearth, and the mixed raw material is preferably reduced by supplying heat from an upper portion of the movable hearth so as to recover zinc 6 while producing reduced iron 7.

Abstract: As a pretreatment of a manufacturing process of sintered ore, a sintering material including iron ore, a SiO2-containing material, a limestone base powdery material and a solid fuel type powdery material is projected as a additional coating auxiliary raw material into the drum mixer with a additional coating conveyor disposed in proximity to an exhaust outlet of the drum mixer. Preferably, a sintering material excepting a limestone base powdery material and a solid fuel type powdery material is charged from a charge inlet of the drum mixer to granulate and in a region disposed on a downstream side, an additional coating auxiliary raw material including a limestone base powdery material and a solid fuel type powdery material is added, and thereby until reaching the exhaust outlet, the additional coating auxiliary raw material is deposited and formed on a exterior coating portion of the sintering material.

Abstract: A synthetic resin fuel for stable production of pig iron in a blast furnace. It is in the form of cylindrical pellets, each measuring X mm in thickness and Y mm in diameter, with X and Y satisfying the three expressions of 3.0≦X≦10, 2≦Y≦20, and Y/X≧1.5. The cylindrical pellets are produced by melting a resin, solidifying the melt, and cutting the solidified product. The cylindrical pellets should preferably contain more than 0.05 wt % of water. A process for producing pig iron in a blast furnace by blowing a synthetic resin fuel into a blast furnace through tuyeres, wherein said synthetic resin fuel is in the form of cylindrical pellets, each measuring X mm in thickness and Y mm in diameter, with X and Y satisfying the above-mentioned three expressions. The cylindrical pellets should preferably have a size distribution such that those having a diameter within ±20 % of the average diameter account for more than 70 wt %.

Abstract: A method for blowing a synthetic resin material into a furnace which comprises processing film-shaped synthetic resins into a first granular resin material; crushing non-film-shaped synthetic resins into a second granular resin material; pneumatically feeding the first granular resin material and the second granular resin material to a furnace; and blowing the first and second granular resin material into the furnace.

Abstract: In a method for operating a blast furnace, the primary supply of reductant and heat is an hydrogen reducing blast. Oxygen or water vapor is injected into the blast furnace to control temperature. Coke is used to provide appropriate gas channels and carburization. Coke use rate can be reduced to less than 10% of that of conventional blast furnace operation. A conventional blast furnace may be converted to this method with minor modification.

Abstract: Fuel and combustion gas are supplied to the blast pipes and tuyeres of a blast furnace through injection lances which have an inner tube and an outer tube. The inner tube is generally used to carry the fuel, while the space formed between the inner and outer tubes is used to carry the combustion gas. Such a lance can have a heat resistant tip which has a bore for forming an extension of the inner fuel supply tube, and which also has a number of helical channels disposed about the bore for forming an extension of the space between the tubes. It is advantageous to have more than one such lance in each blast pipe and to have the lances extend obliquely into the hot blast channel that is formed by the blast pipe and the tuyere.

Abstract: The coring probe is constructed in the form of a tube (1) whose front part is capable of being disassembled into at least two parts (2,3), for example an upper element (2) which is fixed in use to a lower element (3) by members (4) and screws (6). This probe may be employed several times and consequently permits achieving a marked saving relative to known probes.