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1. 发明专利

JP2006240964A Method for producing high purity silicon 有权
标题翻译：生产高纯度硅的方法
公开(公告)号：JP2006240964A
公开(公告)日：2006-09-14
申请号：JP2005062558
申请日：2005-03-07
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： ITO NOBUAKI , KONDO JIRO , OKAZAWA KENSUKE , OKAJIMA MASAKI
IPC分类号： C01B33/037
摘要： PROBLEM TO BE SOLVED: To provide a method for inexpensively providing a source material of high purity Si for a solar cell substrate in a large amount.
SOLUTION: The method for producing silicon includes a step of adding an oxidizing agent to fused silicon to oxidize and remove boron in the silicon, wherein an oxidative gas generating from a high temperature oxidizing agent is sealed within a refining furnace or a narrow space over the fused Si so as to decrease the amount of gas discharged outside the system and to suppress the use amount of the oxidizing agent. Since gasification of the oxidizing agent stops when the pressure reaches the saturation vapor pressure at the current temperature, no rapid gasification of the oxidizing agent is caused and oxidation of boron in Si by the oxidative gas stably proceeds.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：解决的问题：提供一种用于廉价地为太阳能电池基板提供高纯度Si的源材料的方法。解决方案：硅的制造方法包括向熔融硅中添加氧化剂以氧化和除去硅中的硼的步骤，其中从高温氧化剂产生的氧化性气体被密封在精炼炉或窄的在熔融Si上的空间，以减少排出系统外部的气体量并抑制氧化剂的使用量。由于氧化剂的气化在当前温度达到饱和蒸气压时停止，所以不会引起氧化剂的快速气化，氧化气体中的Si中的硼的氧化稳定。版权所有（C）2006，JPO＆NCIPI

2. 发明专利

JP2005247623A Method for removing boron from silicon 有权
标题翻译：从硅中除去硼的方法
公开(公告)号：JP2005247623A
公开(公告)日：2005-09-15
申请号：JP2004059156
申请日：2004-03-03
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： KONDO JIRO , OKAZAWA KENSUKE
IPC分类号： C01B33/037
CPC分类号： C01B33/037
摘要： PROBLEM TO BE SOLVED: To very efficiently remove boron from metal silicon by a simple method at a low price.
SOLUTION: In a method for removing boron from silicon, metal silicon containing boron as an impurity is melted by heating to its melting point to 2,200°C, and a solid based on silicon dioxide and a solid based on an alkali metal carbonate and/or a hydrate of the alkali metal carbonate are added to the molten silicon, thereby removing the boron in the silicon while forming slag.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：通过简单的方法以低价格非常有效地从金属硅中除去硼。解决方案：在从硅中除去硼的方法中，将含有硼作为杂质的金属硅通过加热熔化至其熔点为2,200℃，并且基于二氧化硅和基于碱金属碳酸盐的固体的固体和/或碱金属碳酸盐的水合物加入到熔融硅中，从而在形成炉渣的同时除去硅中的硼。版权所有（C）2005，JPO＆NCIPI

3. 发明专利

JP2003019545A Method for continuously casting molten metal 审中-公开
标题翻译：连续铸造金属的方法
公开(公告)号：JP2003019545A
公开(公告)日：2003-01-21
申请号：JP2001205910
申请日：2001-07-06
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： OKAZAWA KENSUKE
IPC分类号： B22D11/111 , B22D11/108 , B22D11/115
摘要： PROBLEM TO BE SOLVED: To secure a good quality in a cast slab by reducing occurrence ratio of the most serious vertical crack among the surface defect occurring in a continuous casting.
SOLUTION: A method for continuously casting molten metal is performed by using continuous casting powder having ≥1 Ω
-1 cm
-1 electric conductivity in the case of using moving magnetic field in a direction circulating the molten metal in the vertical cross section to the casting direction. As the continuous casting powder, the powder having ≥10 mass% as the total of one or more kinds of FeO, CoO, V
2 O
5 , FeS, Cu
2 S and TiO
2 and ≥0.4 Pa.s viscosity, is desirable to be used.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：通过减少在连续铸造中出现的表面缺陷中最严重的垂直裂纹的发生率来确保铸造板坯的良好质量。解决方案：在使熔融金属在垂直方向上循环的方向上使用移动磁场的情况下，通过使用> =1Ω-1 cm -1的连续铸造粉末来进行连续铸造熔融金属的方法截面到铸造方向。作为连续铸造粉末，作为FeO，CoO，V2 O5，FeS，Cu2S和TiO2的一种或多种，≥0.4Pa.s粘度的总和为10质量％的粉末是理想的。

4. 发明专利

JP2002178118A METHOD FOR CONTINUOUSLY CASTING MOLTEN METAL BY USING MOVING MAGNETIC FIELD 失效
公开(公告)号：JP2002178118A
公开(公告)日：2002-06-25
申请号：JP2000382645
申请日：2000-12-15
申请人： NIPPON STEEL CORP
发明人： OKAZAWA KENSUKE
IPC分类号： B22D11/16 , B22D11/04 , B22D11/07 , B22D11/115
摘要： PROBLEM TO BE SOLVED: To improve the surface quality of a cast slab by increasing flowing quantity of slag for continuous casting into a gap between a mold and a solidified shell at the continuous casting and enhancing lubricating ability between the mold and the cast slab. SOLUTION: In the method for continuously casting molten metal, by using a device having a moving magnetic field circulating the molten metal in a vertical cross section in the casting direction and a function of a mold oscillation, the fluidity of molten slag between the mold and the solidified shell, is controlled by making either one of the frequency of an electromagnetic force in the magnetic field or the frequency of the mold to the integral multiple of another one. It is desirable that the frequency of electromagnetic force is made to the integral multiple of the frequency of the mold. Also the phase difference between the frequency of the electromagnetic force and the frequency of the mold is made definite.

5. 发明专利

JPH10166119A ELECTR0MAGNETIC STIRRING METHOD IN MOLD IN CONTINUOUS CASTING 失效
公开(公告)号：JPH10166119A
公开(公告)日：1998-06-23
申请号：JP33250796
申请日：1996-12-12
申请人： NIPPON STEEL CORP
发明人： KIYOSE AKITO , OKAZAWA KENSUKE , SAWADA IKUO
IPC分类号： B22D11/10 , B22D11/115
摘要： PROBLEM TO BE SOLVED: To easily provide a cast slab less in inclusions in inclusion cumulative zone and excellent in cleanliness by installing an electromagnetic stirring device on the upper wide surface side of four sides to constitute a mold so that the distance from the meniscus to an upper end of the electromagnetic stirring device is the prescribed value. SOLUTION: The discharge flow rate at the position of the distance X(mm) along the discharge flow 6 from a discharge port 3 of a dipping nozzle 2 is 1.5d/x times the discharge flow rate at the discharge port, where d(mm) is the diameter of the dipping nozzle at the discharge port 3. The distance to the position where the discharge flow rate from the meniscus is =L+3d.sinθ and

6. 发明专利

JPH09141402A METHOD FOR REMOVING NONMETALLIC INCLUSION OF MOLTEN METAL 失效
公开(公告)号：JPH09141402A
公开(公告)日：1997-06-03
申请号：JP30439195
申请日：1995-11-22
申请人： NIPPON STEEL CORP
发明人： OKAZAWA KENSUKE , SAWADA IKUO
IPC分类号： B01D15/02 , B01J20/06 , B01J20/28 , B22D11/10 , B22D11/108 , B22D11/11 , B22D11/112 , B22D11/116 , B22D11/117 , B22D11/119 , C21C7/00
摘要： PROBLEM TO BE SOLVED: To improve the removal efficiency of nonmetallic inclusions without closing a nozzle by suspending particles on which nonmetallic inclusions are easy to stick in molten metal flows in a nozzle for molten metal injection into a tundish or mold. SOLUTION: This removing method is a system which sticks nonmetallic inclusions 3 on particles 5 suspended in molten metal 2 and not a method which supplements gaps of a porous body with nonmetallic inclusions like before, so the molten metal 2 is never impeded from passing owing to the blocking of the gaps with the nonmetallic inclusions 3. Further, the flow rate of the molten metal in the nozzle 4 for molten metal injection into the tundish or mold is high and its flow pattern is complicatedly disordered, so the probability of collisions between the particles 5 and nonmetallic inclusions is high and the removal effect on the nonmetallic inclusions is large. The particles 5 are formed of a material which neither reacts on the molten metal nor melts at the molten metal temperature and in concrete, ceramic-made balls formed by burning a raw material such as alumina into spheres are used.

7. 发明专利

JPH0790343A METHOD FOR REMOVING INCLUSION IN MOLTEN STEEL AND FILTER USED THEREFOR 失效
公开(公告)号：JPH0790343A
公开(公告)日：1995-04-04
申请号：JP25756793
申请日：1993-09-22
申请人： NIPPON STEEL CORP
发明人： OKAZAWA KENSUKE , FUJI TAKEHIKO , TAKEUCHI EIICHI
IPC分类号： B22D43/00 , B22D27/02 , C21C7/00 , C22B9/02
摘要： PURPOSE:To efficiently remove inclusions and to improve the quality of ingot by passing the molten steel in a cylindrical filter made of refractories having a shaft part extending in the axial direction at the center, and running the current in the axial direction to generate the pinch force to allow the inclusions in the molten steel to adhere to the wall of the tube. CONSTITUTION:The molten steel 3 is passed through a cylindrical tube filter 2 made of refractories having a shaft part 6 extending in the axial direction at the center, the induced magnetic field is applied to this molten steel 3 or the current 1 is run in the molten steel 1 in the axial direction of the cylindrical tube through energizing, and the pinch force 4 is generated in the molten steel 3 through interaction of this current 1. The inclusions 5 in the molten steel 3 are pushed toward and adhered to the inner wall side of the cylindrical tube filter 2 by making use of the reaction force opposite to the pinch force 4 to be generated by the density difference between the molten steel 3 and the inclusions 5. This constitution efficiently removes the inclusions 5 generated in the molten steel 3, and the ingot of the improved quality is obtained.

8. 发明专利

JPH04319051A CONTINUOUS CASTING METHOD USING STATIC MAGNETIC FIELD 失效
公开(公告)号：JPH04319051A
公开(公告)日：1992-11-10
申请号：JP10965891
申请日：1991-04-16
申请人： NIPPON STEEL CORP
发明人： OKAZAWA KENSUKE , TAKEUCHI EIICHI , HARADA HIROSHI
IPC分类号： B22D11/04 , B22D11/10 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116
摘要： PURPOSE:To damp molten steel flow in a mold and to improve quality of a cast slab by spreading radially static magnetic field with magnets on center face of the mold between parallel long sides in the mold in continuous casting for steel and casting. CONSTITUTION:At the time of continuously casting the steel, axes 9 of one pair of the magnets 5 facing the same poles at both sides of the long sides 15 in the mold, are corresponded. The mold apparatus, setting the axes in vertical to the center face of the mold between the parallel long sides in the mold and centers 11 of both magnets so as to position the equal distance from this face, is used. The static magnetic field with the above magnet is spread radially on the center face of the mold between the long sides in the mold and casting is executed. By this method, the molten steel flow in the mold can be sufficiently damped and float-up of inclusion and bubble is promoted and the quality of cast slab can be remarkably improved.

9. 发明专利

JPH11147161A CONTINUOUS CASTING METHOD AND MOLD FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH11147161A
公开(公告)日：1999-06-02
申请号：JP24927198
申请日：1998-09-03
申请人： NIPPON STEEL CORP
发明人： SAWADA IKUO , OKAZAWA KENSUKE , SHIGEMATSU KIYOSHI , TOKI MASAHIRO
IPC分类号： B22D11/04 , B22D11/07 , B22D11/10
摘要： PROBLEM TO BE SOLVED: To reduce the bulging, breakout and surface crack of a cast slab and to improve the productivity of continuous casting and the product quality by controlling the thickness of air gap developed between a mold and a cast slab (solidified shell) caused by the solidified shrinkage and the transformation shrinkage in the continuous casting of metal, improving the cooling speed between the mold and the case slab and increasing the solidified shell thickness and the powder supplying speed. SOLUTION: In the mold for continuously casting the metal, (1) on the whole periphery so as to surround the cast slab 3 on the lower bottom surface of the mold 1 or on at least the bottom surface of wide surface of the mold, slit 6 for downward injecting the high pressure fluid is arranged. Or, (2) a recessed part is arranged on the whole periphery or on at least the wide surface so as to surround the cast slab 3 so that the surface of the cast slab 3 and the mold become perfectly non-contact on the inner surface at the lower part of the mold 1, and the slit 6 for injecting the high pressure fluid is arranged on the upper surface or the side surface of the recessed part. Further, or (3) a box is attached to the lower part of the mold 1 so as to be connected with the mold, and the slit 6 for injecting the high pressure fluid, is arranged on the bottom surface of the box or the upper surface or the side surface of the recessed part.

10. 发明专利

JPH09192795A METHOD FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH09192795A
公开(公告)日：1997-07-29
申请号：JP825396
申请日：1996-01-22
申请人： NIPPON STEEL CORP
发明人： OKAZAWA KENSUKE , SAWADA IKUO , KIYOSE AKITO , KISHIDA YUTAKA
IPC分类号： B22D11/07 , B22D11/16
摘要： PROBLEM TO BE SOLVED: To reduce the developing rate of a longitudinal crack and to improve the quality of a cast slab by continuously inserting a sheet coated with lubricator onto both side surfaces of a metallic plate into a gap between a cast slab and a mold. SOLUTION: The sheet coated with the lubricants 7, 8 on both surfaces of the metallic plate 6 is inserted into the gap between the mold 4 and the cast slab 5. Since the lubricants 7, 8 for lubricating between the mold 4 and the metallic plate 6 and between the metallic plate 6 and the cast slab 5 are applied in uniform thickness on the metallic plate 6 before inserting the sheet into the gap between the mold 4 and the cast slab 5 and inserted together with the metallic plate 6 in the casting width direction almost at the same velocity, the uniformity of coated material after inserting is kept. By this method, the development of the longitudinal crack on the cast slab surface caused by the unevenness of the lubrication and the heat dissipation resulting from molten slag flowing into the gap between the mold 4 and the cast slab 5 is prevented.

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