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21. 发明专利

JPS5511159A CONVERTER USABLE IN REVERSED POSITION 失效
公开(公告)号：JPS5511159A
公开(公告)日：1980-01-25
申请号：JP8380478
申请日：1978-07-10
申请人： KAWASAKI STEEL CO
发明人： KAWARADA AKIRA , NAKAMURA TSUTOMU , KAZUTSUCHI FUMIO , NAGAI JIYUN
IPC分类号： C21C5/42
摘要： PURPOSE:To lengthen the lifetime of refractory material in a converter, by using the converter in upside down position because the damage of the refractory material in an LD converter is caused at portions lower than the trunnion line more than at upper portions. CONSTITUTION:Cylindrical barrel-shaped shell 6, which has openings 4, 5 of diameters smaller than of the barrel at the top and the bottom, is lined with refractory material 7 to form an LD converter. A tapping hole 10 and a stand-by tapping hole 12 are installed symmetrically about the trunnion 11, the stand-by tapping hole being closed. A bottom opening 5 out of the two openings made at the top and the bottom is closed with furnace bottom bricks 8 to form the furnace bottom. In that position, oxygen top-blowing refining is repeated to continue the operation with damaged bottom bricks replaced. During the operation the bricks 7 in the furnace is damaged mostly at protions lower than the trunnion 11, so that the converter is turned upside down and is operated using the opening 4 as the bottom, and the opening 5 as the furnace opening, using the stand-by tapping hole 12 as a tapping hole with the tapping hole 12 closed. Hereby, the refractory material 7 is damaged mostly at portions upper than the trunnion 11 in normal position shown in the figure, causing consumption equally at all portions, so that life-time is remarkably lengthened.

22. 发明专利

JPS5494418A PRODUCTION BY MELTING OF LOW HYDROGEN STEEL IN PURE OXYGEN BOTTOM BLOWING CONVERTER 失效
公开(公告)号：JPS5494418A
公开(公告)日：1979-07-26
申请号：JP81278
申请日：1978-01-10
申请人： KAWASAKI STEEL CO
发明人： NAGAI JIYUN , KAZUTSUCHI FUMIO , YAMADA SUMIO
IPC分类号： C21C5/34 , C21C5/28

23. 发明专利

JPS5339908A METHOD OF ADDING ALLOYING COMPONENTS TO MOLTEN METAL 失效
公开(公告)号：JPS5339908A
公开(公告)日：1978-04-12
申请号：JP11469276
申请日：1976-09-27
申请人： KAWASAKI STEEL CO
发明人： IKEDA TAKAFUMI , KAWARADA AKIRA , KAZUTSUCHI FUMIO , TANNO EIICHI , KUBOTA KAZUO
IPC分类号： C21C7/04 , C22C1/02 , C22C33/04

24. 发明专利

JPS56123318A REFINING METHOD OF METAL REFINING FURNACE FOR PRODUCING LARGE AMOUNT OF CO FOR RECOVERING EXHAUST GAS 失效
公开(公告)号：JPS56123318A
公开(公告)日：1981-09-28
申请号：JP2396480
申请日：1980-02-29
申请人： KAWASAKI STEEL CO
发明人： ODAKA MIKIO , MORISHITA HITOSHI , UMADA HAJIME , KAZUTSUCHI FUMIO
IPC分类号： C10J3/57 , C21C5/34 , C21C5/38
摘要： PURPOSE:To contain a large amount of CO in the exhaust gas produced by blowing powdery and granular limestone into the steel bath of a converter provided with an exhaust gas recovery device in particular thereby causing the CO2 produced by the thermal decomposition thereof to react with the C in molten steel. CONSTITUTION:Powdery limestone is blown together with a carrier gas through the bottom tuyeres of a converter toward the molten steel bath surface in a converter, and the CO2 produced by decomposition reaction is caused to react with the C in the molten steel, whereby CO is formed. The greater part of the CO produced is recovered by a converter exhaust gas recovering device and as a result, the content of C in the molten steel is decreased and the O2 source necessary for decarbonization is saved. As a carrier gas, an inert gas such as CO2 is used, besides O2 gas. The maximum grain size Dmax of the limestone used is in the relation of the formula; for example, the suitable grain sizes of the limestone are

25. 发明专利

JPS55161017A BLOWING METHOD FOR DEPHOSPHORIZATION OF MOLTEN STEEL BY BOTTOM BLOWING CONVERTER 失效
公开(公告)号：JPS55161017A
公开(公告)日：1980-12-15
申请号：JP6938879
申请日：1979-06-05
申请人： KAWASAKI STEEL CO
发明人： UMADA HAJIME , KAZUTSUCHI FUMIO , NAGAI JIYUN
IPC分类号： C21C5/34
摘要： PURPOSE:To increase the concentration of iron oxide in slag and to accelerate the dephosphorization reaction of molten steel without increasing the oxygen concentration in the molten steel, by inclining the converter during oxygen blowing or after blowing out and sending oxygen in the boundary limits of molten steel and molten slag, on occasion of carrying out steel making refining by bottom blowing converter. CONSTITUTION:Concentration of FeO in molten slag is smaller and progress of dephosphorization reaction is slower than the case of oxygen top blowing converter at the operation of bottom blowing converter. Especially, the above tendency is remarkable and the dephosphorization reaction is not accelerated at the point of time of having a high carbon content yet. Oxygen is blown moving the converter on the slant on the way of oxygen blowing or after blowing out, making so as to be the oxygen from the tuyere of furnace bottom brought in the boundary limits of molten steel and molten slag. FeO concentration in the molten slag is increased by the oxidation reaction in the boundary limits without increasing O2 concentration in the molten steel and P in the molten steel is oxidized to P2O3 by FeO and the dephosphorization reaction is accelerated by forming a stable (CaO)4P2O5 reacting P2O5 with CaO in the slag.

26. 发明专利

JPS55161016A REFINING METHOD FOR BOTTOM BLOWING CONVERTER 失效
公开(公告)号：JPS55161016A
公开(公告)日：1980-12-15
申请号：JP6938779
申请日：1979-06-05
申请人： KAWASAKI STEEL CO
发明人： UMADA HAJIME , NAGAI JIYUN , KAZUTSUCHI FUMIO
IPC分类号： C21C5/34
摘要： PURPOSE:To prevent the generation of spitting and fusion loss of lining brick of converter by blowing CaO having mol number of two times or more of SiO2 produced by the oxidation of Si that occurs in the early stage of oxygen blowing at the operation of bottom blown converter. CONSTITUTION:Powder of quicklime is blown an slagging agent together with oxygen gas from the tuyere of furnace bottom at the time of refining pig iron for steel by oxygen blowing in the bottom blowing converter. On this occasion, SiO2 is formed by the oxidation of Si at the early stage of blowing at first and blowing amount and speed of CaO are controlled so as to exist more CaO than forming dicalcium silicate of (CaO)2.SiO2 by produced slag always. Mol ratio of CaO:SiO2 in produced slag is made at 2:1 or more from the early stage of blowing and all produced SiO2 is changed to a stable (CaO)2SiO2. Accordingly, basic lining refractory material such as MgO etc. is not spoiled by free SiO2 by fusion or yield of molten steel is not lowered by spitting phenomena.

27. 发明专利

JPS55107715A BLOWING METHOD OF DEPHOSPHORIZER TO BOTTOM BLOWING CONVERTER 失效
公开(公告)号：JPS55107715A
公开(公告)日：1980-08-19
申请号：JP1501279
申请日：1979-02-14
申请人： KAWASAKI STEEL CO
发明人： UMADA HAJIME , KAZUTSUCHI FUMIO
IPC分类号： C21C5/34
摘要： PURPOSE:To achieve dephosphorization effect with less lime use amount and reduce the amount of slag formation by adding part of quicklime for desulfurization at the time when the C content of the bath has decreased at the end period of blowing, at the bottom blowing converter operation. CONSTITUTION:In producing steel by oxidation refining molten iron in the bottom blowing converter, quicklime powder as a slag forming material is blown together with oxygen for refining through the bottom tuyere. Since the FeO formed by the oxygen blown near the tuyere is used preferentially for oxidation decarbonation reaction of C in the bath at the initial period of refining, the oxidation of P in the bath by FeO begins on a full scale from about final 20% of the time when the decarbonation reaction progresses and has entered low carbon region. Hence, at this timing, i.e., at the time when the greater part of the decarbonization reaction ends upon lapse of 80% of blowing time, CaO as flux for dephosphorization slag is blown 4-20kg per ton of molten steel together with oxygen through the bottom tuyere. Slag amount can be less, hence the losses of FeO into the slag are reduced.

28. 发明专利

JPS5550415A CONTROLLING METHOD FOR NITROGEN CONTENT IN BLOWING OUT STEEL AT BOTTOMMBLOWN CONVERTER REFINING 失效
公开(公告)号：JPS5550415A
公开(公告)日：1980-04-12
申请号：JP12142978
申请日：1978-10-04
申请人： KAWASAKI STEEL CO
发明人： NAGAI JIYUN , KAZUTSUCHI FUMIO , KAWARADA AKIRA , YAMADA SUMIO
IPC分类号： C21C5/34
摘要： PURPOSE:To control the nitrogen content with a high yield, by blowing nitrogen in the bottom-blown converter within the limits of 0.1-0.7% of carbon content in the steel at the time of manufacturing nitrogen contained steel in the above converter. CONSTITUTION:On occasion of refining steel by oxygen blowing the bottom-blown converter, sample is picked out at the closing stage of blowing and carbon content is analyzed quickly. Oxygen blowing is stopped for a while when the carbon content is made within the limits of 0.1-0.7% and nitrogen is blown from the tuyere of furnace bottom and then, is absorbed so as to contain aimed nitrogen. Next, oxygen blowing is carried out again and decarbonizing refining is carried out so as to contain the aimed nitrogen content. The steel containing aimed C and N, is manufactured without lowering the nitrogen content at the time of blowing out. Absorptivity of nitrogen is good and the nitrogen content by oxygen blowing is not lowered nearly and then, hitting rate of the nitrogen content is improved when nitrogen is blown within the limit of 0.1-0.7% of C content.

29. 发明专利

JPS5541975A SMELTING METHOD BY CONVERTER FOR IMPROVING HEAT VALUE OF RECOVERED GAS PER UNIT PRODUCT 失效
公开(公告)号：JPS5541975A
公开(公告)日：1980-03-25
申请号：JP11621978
申请日：1978-09-20
申请人： KAWASAKI STEEL CO
发明人： YAMADA SUMIO , KAZUTSUCHI FUMIO
IPC分类号： C21C5/30 , C21C5/38
摘要： PURPOSE:To minimize the fluctuation of the furnace pressure, and to improve the heat at value of recovered gas per unit product, in the noncombustion recovery apparatus for the converter gas, by adjusting the oxygen feed rate correspondingly to the timing of charge of the temperature adjusting coolant for generating the oxygen gas within the molten steel like as the iron ore, the lime stone, etc. CONSTITUTION:At smelting the steel by the converter, the oxygen feed rate is adjusted corresponndingly to the amount and charging velocity of subsidiary material like as the iron ore, mill scale, lime stone, etc., to generate the oxygen etc., within the molten steel. Hereby, the amount of gas generated in the furnace is kept constant, the fluctuation of the furnace pressure is restricted to a small value, the leak of gas or sucking of outside air through the gap between the skirt and the furnace port is prevented, and the useless combustion of the generated gas is prevented; hereby, the heat value of the recovered gas per unit product can be improved.

30. 发明专利

JPS5494419A PRODUCTION BY MELTING OF LOW HYDROGEN STEEL IN PURE OXYGEN BOTTOM BLOWING CONVERTER 失效
公开(公告)号：JPS5494419A
公开(公告)日：1979-07-26
申请号：JP81378
申请日：1978-01-10
申请人： KAWASAKI STEEL CO
发明人： NAGAI JIYUN , KAZUTSUCHI FUMIO , YAMADA SUMIO
IPC分类号： C21C5/34 , C21C5/28

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