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1. 发明专利

JPH07242426A PRODUCTION OF HIGH-PURITY IRON SULFATE FROM WASTE SULFURIC ACID PICKLING SOLUTION OF STAINLESS STEEL 失效
公开(公告)号：JPH07242426A
公开(公告)日：1995-09-19
申请号：JP3503894
申请日：1994-03-04
申请人： HAMADA JUKO , NIPPON STEEL CORP
发明人： INOUE MASAYUKI , HANDA SHUJI , ISHITA TSUTOMU , OGAMI HIRONOBU , SARUWATARI NAOKI , AOKI TAKESHI , NAKAYAMA KOJI
IPC分类号： C02F1/64 , C01G49/14
摘要： PURPOSE:To efficiently produce high-purity iron sulfate heptahydrate at a low cost from a waste pickling soln. of stainless steel with a compact equipment and a simple operation. CONSTITUTION:Waste sulfuric acid having high contents of acid, Fe and a heavy metal such as Cr discharged from the pickling of stainless steel, etc., with sulfuric acid is added with metallic iron or a granular material contg. metallic iron and neutralized to precipitate the hydroxide of a heavy metal such as Cr which is settled and separated, the pH of the waste sulfuric acid is controlled, the soln. is cooled to crystallize iron sulfate, and high-purity iron sulfate is precipitated. In this case, the waste sulfuric acid is diluted prior to neutralization to adjust its concn. The separated liq. freed from the precipitated iron sulfate is circulated and used for the dilution. Alternatively, a flocculant is added to the waste sulfuric acid soln. to flocculate the hydroxide of a heavy metal such as Cr before the precipitation, settling and separation of the hydroxide.

2. 发明专利

JPH05161942A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH05161942A
公开(公告)日：1993-06-29
申请号：JP33046491
申请日：1991-12-13
申请人： NIPPON STEEL CORP
发明人： NAKAJIMA HIROYUKI , KOSUGE TOSHIHIRO , MATSUMURA SHOGO , KAWAI HIROYUKI , SAIDA SEISHIRO , INOUE MASAYUKI , KAWAMOTO KATSUHIKO
IPC分类号： B22D11/04 , B22D11/10 , B22D11/106
摘要： PURPOSE:To prevent blow holes from being generated in a cast slab and to improve the quality of the cast slab in a continuous casting. CONSTITUTION:Sealing gas exceeding the atmospheric pressure and being soluble to a molten metal M is always supplied over the whole circumference on contact surfaces of a mold 16 and a braking ring 14 from an inlet side of the mold 16. Further, a closed curve having the diameter larger than the inner diameter of the mole 16 is made to a boundary, and an interruption space 49 interrupting the air is disposed adjacent to the outlet of the mold 16 and the inner part in the interruption space 49 is held to less than the atmospheric pressure.

3. 发明专利

JPH03226532A METHOD FOR REPRODUCING METALLIC SCRAP TO STEEL MAKING RAW MATERIAL 失效
公开(公告)号：JPH03226532A
公开(公告)日：1991-10-07
申请号：JP2126790
申请日：1990-01-30
申请人： HAMADA JUKO , NIPPON STEEL CORP
发明人： TANAKA KAZUO , SAIDA SEISHIRO , INOUE MASAYUKI , SHIGEKI MICHIO , MUTO MITSUAKI , MURAKAMI HIROTSUYO
IPC分类号： C22B9/00 , C22B1/00
摘要： PURPOSE:To effectively make best use of metallic scrap contg. oil-components, Ni and Cr as a steel making raw material by compressing the metallic scrap to lamps and dry distilling the lumps in a nonoxidative atmosphere, thereby removing the oil components. CONSTITUTION:The metallic scrap contg. the oil components, Ni and Cr (for example, grinding swarf of stainless steel sheets) is compressed to the lumps which are put into a dry distillate housing container 28. This container is installed in a dry distillation vessel 10. The dry distillation vessel 10 is hermetically sealed and gaseous nitrogen of a tank 38 is introduced via a valve 37 to generate the nonoxidative atmosphere; thereafter, a burner 19 is burned to execute dry distillation wile a fan 26 is rotated by a motor 26a. The evaporated oil components are discharged via a gas pipe 11 and the oil condensed in a gas pipe 11 is sent via an oil cooler 12 and a recovered oil tank 16 to a storage tank 18. The non-condensed oil is sent via a condenser 13 and a recovered oil tank 17 to a storage tank 18. The gas past the condenser 13 is sent to a water sealing chamber 14. The recovered oil and gas are respectively used as the fuel of the dry distillation vessel 10.

4. 发明专利

JPS62139820A METHOD FOR CONTROLLING PRESSURE OF CONTINUOUS TYPE HEATING FURNACE 失效
公开(公告)号：JPS62139820A
公开(公告)日：1987-06-23
申请号：JP28140585
申请日：1985-12-13
申请人： NIPPON STEEL CORP
发明人： KUBOYAMA EIICHI , NAKANO TOSHIHIDE , INOUE MASAYUKI
IPC分类号： C21D1/00 , C21D9/00 , F27B9/40 , F27D19/00 , F27D99/00
摘要： PURPOSE:To prevent the intrusion of air into a continuous type heating furnace for slabs during opening and closing of the door thereof and to prevent the abnormal generation of NOx by providing a control system for the furnace pressure and command system for fixing and setting the opening degree thereof as the control system for driving the opening and closing of an exhaust damper of the heating furnace. CONSTITUTION:An arithmetic part 9 takes in the operation start time To from a host computer CPU, takes in the waste gas temp. The near the door to be opened at the time Ts, the in- furnace pressure P, combustion load V in this stage and the opening degree (x) of a furnace pressure damper 4 and calculates the correction rate of the damper opening degree enough to compensate the decrease of the in-furnace pressure when the door opens in order to open the door 1 for ejecting the slabs or the door 2 for charging the slabs in the stage of continuously heating the slabs S1-Sn in the continuous type heating furnace for the slabs. The computer calculates the time required until the furnace pressure near the door starts changing in this stage and applies the pressure signal to close the damper opening degree at the time T1 to an actuator of the furnace pressure damper 4. The drop of the furnace pressure near the doors 1, 2 in the opening stage of the doors is averted by such control, by which the intrusion of external air is prevented and the abnormal generation of NOx by the intruded air is prevented.

5. 发明专利

JPS58110614A HEATING FURNACE AND OPERATING METHOD 失效
公开(公告)号：JPS58110614A
公开(公告)日：1983-07-01
申请号：JP20820881
申请日：1981-12-24
申请人： NIPPON STEEL CORP
发明人： INOUE MASAYUKI , YAMAZAKI JIROU , SONOYAMA SAKAE
IPC分类号： F27B9/30 , F27B9/40 , F27D19/00 , F27D99/00
摘要： PURPOSE:To prevent the radiant heat from the inside of a heating furnace to a flue and to control furnace pressure by providing a partition wall which is adjustable of openings, etc. in the evacuating port of the flue of the furnace. CONSTITUTION:A stationary partition wall 3 and a partition wall 2 which is movable along the opening surface of a flue port are installed in front of the evacuating port of the flue 9 of a furnace body 1. The opening of a damper 8 for controlling furnace pressure installed in the flue 9 is substantially fully opened. Thereafter, the furnace pressure is detected with a detector 4, and the stroke of the wall 2 is fixed in the positin where the difference between the set furnace pressure and the detected value is minimized. The remining micro difference is controlled with the damper 8. Thus the radiation from the inside of the furnace to the flue is prevented and a shielding effect is obtained with good efficiency within the control range for the furnace pressure.

6. 发明专利

JPH03245941A OIL COLLECTION METHOD FOR DRY-DISTILLATION 失效
公开(公告)号：JPH03245941A
公开(公告)日：1991-11-01
申请号：JP4184890
申请日：1990-02-21
申请人： HAMADA JUKO , NIPPON STEEL CORP
发明人： TANAKA KAZUO , INOUE MASAYUKI , KINOSHITA MASAAKI , MURAKAMI HIROTSUYO
IPC分类号： B23Q11/00 , B01D3/14 , C10B53/00 , C22B1/00
摘要： PURPOSE:To simply collect oil, being sorted into different properties, and to facilitate the handling and process of collected oil by providing coolers in several stages having different cooling temperatures so as to collect oil to be condensed while being distilled. CONSTITUTION:A cluster of stainless chips disposed in a container 28 for materials to be distilled, is introduced into a distilling furnace 10. When the temperature of the cluster increases, cutting oil contained therein is evaporated, and is led through a gas pipe 19 into a first cooler 1 inside of which is held at a temperature of about 400 deg. C. Therefore, the oil having a high boiling point is condensed and then flows into an oil cooling device 12 so that it is collected and is led into one of collection tanks 16. Gas to be distilled containing an oil phase part which has not yet been condensed in the first cooler 11, is moved into a second cooler 13 for distilling gas, which has been cooled to a temperature around a room temperature by cooling water, oil and water contained in the gas to be distilled are condensed substantially so that oil having a low boiling temperature is collected and is then led to one of collecting tanks 17.

7. 发明专利

JPH03240925A OPERATING METHOD OF DRY DISTILLER 失效
公开(公告)号：JPH03240925A
公开(公告)日：1991-10-28
申请号：JP3592790
申请日：1990-02-15
申请人： HAMADA JUKO , NIPPON STEEL CORP
发明人： TANAKA KAZUO , INOUE MASAYUKI , KINOSHITA MASAAKI , MURAKAMI HIROTSUYO
IPC分类号： C22B1/00 , C10B47/06 , C10B53/00
摘要： PURPOSE:To make improvement in treating capacity and to save fuel by judging the end point of dry distillation by detection of the current value of a motor driven fan at the time of putting a material to be dry distilled into a dry distillation still and dry distillating this material by heating. CONSTITUTION:The material which is to be dry distilled and contains grinding oil is put into a dry distillate housing vessel 30 in the dry distillation still 10 and the distillation still is hermetically closed by a cap 26. Gaseous nitrogen is introduced from a tank 54 via a valve 53 into the distillation still to maintain a nonoxidative atmosphere in the dry distillator 10. A motor 27 is then drive to turn the motor driven fan 28 in the dry distillation still 10 and an oil burner 18 is burned to heat the inside of the dry distillation still 10 by which the material to be dry distillation is dry distillated. The cutting oil contained in the material to be dry distillated evaporates and the load of the motor driven fan 28 increases when the temp. of this material rises. The gas of the high molecular weight is no longer generated and the load of the motor driven fan 28 decreases upon ending of the dry distillation. The time when the current value of the motor driven fan 28 decreases to the initial value of the dry distillation is judged to be the end point of the dry distillation.

8. 发明专利

JPH01180716A DESCALING METHOD FOR HIGH TEMPERATURE BILLET 失效
公开(公告)号：JPH01180716A
公开(公告)日：1989-07-18
申请号：JP33490887
申请日：1987-12-28
申请人： NIPPON STEEL CORP
发明人： ONODA MASAMI , KAWABE MITSUHARU , INOUE MASAYUKI , MATSUDA TSUYOSHI
IPC分类号： B21B45/06
摘要： PURPOSE:To effectively remove the scale of the high temp. billet regardless of the surface shape by reciprocating needle-shaped or stick-shaped bodies on the surface of the high temp. billet to hit. CONSTITUTION:When the scale of the hot temp. billet S, for instance, a hot slab, bloom, etc., the needle-shaped bodies 1 are reciprocated to hit the billet S. In this case, the needle-shaped bodies 1 are operated largely to descale through dead weight compared with shot of grinding grains. Further, the hitting angle for the billet S is easily set, from this point of view, the optimum angle for descaling is enabled stably and easily setting. Furthermore, the stroke of the needle-shaped body 1 is properly about 20mm, for instance, the length of the needle-shaped body 1 is enabled freely setting in accordance with restrictions of the length of the needle-shaped body 1 or the space required to set the equipment. Moreover, because the contact between the needle-shaped body 1 and the billet S is in a short time and intermittent, the temp. rise of the needle- shaped body 1 is small and the temp. drop of the billet S is little.

9. 发明专利

JPH05177306A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH05177306A
公开(公告)日：1993-07-20
申请号：JP34472191
申请日：1991-12-26
申请人： NIPPON STEEL CORP
发明人： NAKAJIMA HIROYUKI , KOSUGE TOSHIHIRO , MATSUMURA SHOGO , KAWAI HIROYUKI , SAIDA SEISHIRO , INOUE MASAYUKI , OGURO HARUO , SHIGESAWA RYUZO , FUJII TSUTOMU
IPC分类号： B22D11/04 , B22D11/055 , B22D11/10 , B22D11/106
摘要： PURPOSE:To prevent the invasion of insoluble gas to molten metal, such as argon in the air, into a mold and bubble generated in a cast slab and improve the quality of a cast billet by shutting off the air. CONSTITUTION:Into the cooling mold 24 provided with an inlet and an outlet, the molten metal M is continuously supplied from a tundish 10 at least through a brake ring 22 contacting with the mold inlet. In the mold 24, the molten metal M is continuously cooled, and the solidification of the molten metal M is started at lower part than the molten metal surface to form the cast billet C, and the cast billet C is intermittently drawn out to the mold 24 from the outlet side of the mold 24. Then, sealing gas being soluble to the molten metal M and exceeding the atmospheric pressure is always supplied to the whole circumference of contacting surface of the mold 24 and the brake ring 22 from the inlet side of the mold 24 and gap between the inner peripheral surface of the mold 24 and the outer peripheral surface of the cast billet from the outlet side of the mold 24.

10. 发明专利

JPH0417950A CONTINUOUS CASTING METHOD SOLIDIFYING BELOW MOLTEN METAL SURFACE 失效
公开(公告)号：JPH0417950A
公开(公告)日：1992-01-22
申请号：JP11766490
申请日：1990-05-09
申请人： NIPPON STEEL CORP
发明人： NAKAJIMA HIROYUKI , SAIDA SEISHIRO , MATSUSHIMA TATSUTO , INOUE MASAYUKI
IPC分类号： B22D11/04 , B22D11/10 , B22D11/11 , B22D11/112 , B22D11/116 , B22D11/117
摘要： PURPOSE:To reduce blow hole developed at near surface of a cast billet by casting molten metal under condition of reduced pressure at outside of brake ring. CONSTITUTION:By using the brake ring 2, continuous casting solidifying below the molten metal surface is executed. Then, the molten metal is cast under condition of reduced pressure at the outside of brake ring 2. In this case, a mold 1, brake ring 2 and an intermediate ring 3 are used and gap part 6 formed with the mold 1, brake ring 2 and the intermediate ring 3 is sealed, and also by using gas suction hole 11, the casting is executed under condition of reduced pressure in the gap part 6. This continuous casting is applied to the horizontal casting method. By this method, the cast billet having high quality can be produced.

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