摘要:
In order to enhance the CO concentration contained in exhaust gas generated during the refining of metal and to recover the CO as an energy source, granular limestone is blown into molten iron containing at least 0.3% of carbon through a tuyere together with a refining gas, and CO.sub.2 generated by the decomposition of the limestone is reacted with carbon contained in the molten iron to form CO, and the resulting CO is recovered.
摘要:
A method of dephosphorizing molten pig iron, wherein molten pig iron is charged into a refining vessel provided at its bottom with tuyeres for blowing gas and, if necessary, at its top with a gas injecting member, and a powdery refining agent together with the blowing gas is blown into molten pig iron through the tuyeres, while a flux for the refining agent is charged into the refining vessel to perform desiliconization and subsequent dephosphorization of molten pig iron, is disclosed. This method comprises(a) charging a coolant together with molten pig iron into the refining vessel to control a temperature of molten pig iron during the blowing to a range of 1,250.degree.-1,450.degree. C.;(b) blowing the powdery refining agent into molten pig iron so as to adjust a value of slag basicity after the treatment to not less than 2.5; and(c) blowing the blowing gas at a rate of not less than 0.5 Nm.sup.3 /min.t so that a net oxygen quantity is 8-15 Nm.sup.3 per ton of molten pig iron.
摘要:
Disclosed herein is a flow change-over valve for the blowing of fluids into a molten metal vessel, which includes a housing provided with at least three inlet ports for different fluids and an outlet port, a valve body with a main passage communicating selectively between one of the inlet ports and the outlet port and rotatably supported in the housing to perform the changing-over of inlet passages. Among these inlet ports, an inlet port for purging fluid is opened in the housing, and a shroud-like gap surrounding the valve body is formed between the inner periphery of the housing and the outer periphery of the valve body in such a manner that it communicates with the inlet port for the purging fluid disposed in the housing and is always to be communicated with an opening of an inlet port of the main passage during the changing-over through the rotation of the valve body.
摘要:
Injection-desulfurization of a molten iron is carried out in a low cost by using powdery CaCO.sub.3 obtained by pulverizing limestone as a desulfurizing agent. This injection-desulfurization also can be attained by using a powdery mixture in which a main ingredient is said powdery calcium carbonate and not more than 30% by weight of powdery quicklime is added thereto, a powdery mixture in which a main ingredient is said powdery calcium carbonate and 5.about.20% by weight of a carbonaceous material and 2.about.15% by weight of at least one of halides of alkali and alkaline earth metals are added thereto, or a powdery mixture in which a main ingredient is said calcium carbonate and 5.about.20% by weight of a carbonaceous material, 2.about.15% by weight of at least one of halides of alkali and alkaline earth metals and not more than 30% by weight of powdery quicklime are added thereto, as the desulfurizing agent.
摘要:
A method of removing non-metallic inclusions from a molten metal by allowing the molten metal to pass through at least first and second vessels which are intermediate between a ladle and a mold. The molten metal is made to stay in the vessel for a period not shorter than 40 seconds while a horizontal rotation is imparted to the molten metal in the first vessel. The molten metal is then transferred from the first vessel to the second vessel. The molten metal in the second vessel is then heated. This method is suitably carried out by an apparatus comprising a first vessel having a discharge opening at its bottom and surrounded by a rotational magnetic field generating device for centrifugation of the molten metal in the first vessel, and a second vessel for receiving the molten metal discharged from the first vessel and provided with a heating device for heating the molten metal received therein.
摘要:
A process for producing a steel in at least two converters using a great or substantial amount of an iron-bearing cold material. The iron-bearing cold material and a carbonaceous material are supplied into one of the converters under the presence of a molten iron or a preliminarily treated molten iron and are melted therein under oxygen-blowing to obtain a preliminarily treated molten iron containing a high content of carbon, and the preliminarily treated molten iron is refined in the other converter under oxygen-blowing to obtain a molten steel having the given composition.
摘要:
A received frame processing device that receives a frame of variable length from a network, and transfers the frame to a buffer group that is provided on a system memory and is a common area to a CPU, wherein a buffer includes a plurality of buffers. And a second frame is transferred to a first buffer when the second frame is received before a given amount of time has elapsed after a first frame has been transferred to the first buffer, on the other hand, the second frame is transferred to a second buffer after the ownership of the first buffer has been transferred to the CPU when the second frame is received after the first frame has been transferred to the first buffer and after a given amount of time or longer has elapsed.
摘要:
The present invention of a storage control apparatus which is connected to a host bus connected to a CPU (Central Processing Unit), a peripheral bus connected to at least one IP (Intellectual Property), and a system memory and controls DMA (Direct Memory Access) transfer from the IP to the system memory, having: an address map judgment section which judges whether an address given from one of the peripheral bus and the host bus indicates a memory area managed by the storage control apparatus in the system memory; a memory control section which controls data transfer to/from the system memory; a TLB (Translation Look-aside Buffer) information holding section which holds address information that indicates an area cacheable by the CPU; an address judgment section which judges on the basis of the address information held by the TLB information holding section whether the address given from one of the peripheral bus and the host bus indicates the area cacheable by the CPU; and a snoop address control section which, when it is judged on the basis of a judgment result from the address judgment section that the CPU needs to be notified of the address, executes notification through the host bus.
摘要:
There is disclosed a functional block which comprises a function portion, a plurality of block input terminals, a plurality of block output terminals, a first signal holding circuit group connected between inputs of the function portion and the plurality of block input terminals, and a second signal holding circuit group connected between outputs of the function portion and the plurality of block output terminals. Since the first signal holding circuits and the second signal holding circuits receive a clock signal supplied externally to the functional block and then operate to synchronize with the clock signal respectively, a delay time of output signals for input signals in the functional block can be easily estimated. Hence, simulation of a semiconductor integrated circuit constructed by combining a plurality of functional blocks can be easily performed.
摘要:
In this invention, the smelting reduction operation can be carried out in a high efficiency by charging a carbonaceous material in such an amount that total surface area is not less than 60 m.sup.2 per 1 ton of slag weight. Carbon substance finely particulating through thermal crumbling under a high-temperature atmosphere inside the vessel is used as the carbonaceous material, whereby it is possible to stably conduct the smelting reduction while controlling the scattering of the carbonaceous material, and also the erosion, particularly locally erosion of refractory in the smelting reduction furnace, which was a serious problem in the conventional technique, can considerably be decreased to largely prolong the service life of refractory.