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公开(公告)号：US06521040B2
公开(公告)日：2003-02-18
申请号：US09984038
申请日：2001-10-26
IPC分类号： C04B1814
CPC分类号： C22B7/006 , C22B5/08 , C22B7/04 , C22B34/32 , Y02P10/234
摘要： A method of rapidly reducing chromium oxide-containing slag and the like in large quantities, in a simplified manner and without requiring high temperatures. Chromium oxides are reduced with at least one of elementary sulfur and compounds of sulfur having a valence less than 6. For an aqueous solution of the sulfur component, desirably, its sulfur content is more than 0.03% by weight. As the sulfur source, preferred is blast furnace slag (e.g., non-aged, gradually-cooled blast furnace slag) that is discharged in large quantities in the iron industry. Cr6+ in chromium oxides is reduced in one of the following ways: (a) Chromium oxide-containing substances are sprayed with or immersed in blast furnace slag-released water that has been used in cooling blast furnace slag. (b) Chromium oxide-containing substances are mixed with blast furnace slag, and then kept in an air atmosphere. Optionally, the mixture is sprayed with blast furnace slag-released water. (c) Chromium oxide-containing substances are mixed with blast furnace slag, and then steamed. (d) Prior to the reduction treatment, chromium oxide-containing substances are preferably steamed. 100 parts by weight of reduced chromium oxide-containing compounds are mixed with from 0.1 to 90 parts by weight of sulfur-containing slag, and used in various civil engineering works.
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公开(公告)号：US06732547B1
公开(公告)日：2004-05-11
申请号：US09700020
申请日：2000-11-09
IPC分类号： C04B506
CPC分类号： C04B5/06 , C04B2111/1075 , C21C5/005 , C21C5/54 , C21C7/0685 , C22B7/04 , Y02P10/216
摘要： The slag in a molten state formed at a step of refining stainless steel is adjusted such that the slag has a basicity in the range of 1.3-4.0, and the slag is mixed with a sulfur-containing material wherein the sulfur is zero or minus in valence, thereby setting the concentration of sulfur in the slag to be not less than 0.2% by weight. The slag is so modified that Cr6+ is substantially completely prevented from being eluted and can be effectively utilized as a roadbed material and a reclamation material for civil works. The slag is quenched at such a speed of cooling that the temperature of the slag is decreased from 1200° C. to 400° C. within 48 hours so that noticeable effects are attained.
摘要翻译： 调整在精炼不锈钢的步骤中形成的熔融状态的炉渣，使得炉渣的碱度范围为1.3-4.0，炉渣与含硫物质混合，其中硫为零或负 从而将炉渣中的硫浓度设定为不小于0.2重量％。 炉渣进行了如此修改，使得Cr <6+>基本上完全防止洗脱，可以有效地用作土木工程的路基材料和填土材料。 炉渣以这样的冷却速度淬火，使炉渣的温度在48小时内从1200℃降至400℃，从而达到明显的效果。
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公开(公告)号：US5152831A
公开(公告)日：1992-10-06
申请号：US767984
申请日：1991-09-30
申请人： Koji Yamaguchi , Yasuo Kishimoto , Toshikazu Sakuraya , Masaru Washio , Kazuhisa Hamagami , Hiroshi Nishikawa
发明人： Koji Yamaguchi , Yasuo Kishimoto , Toshikazu Sakuraya , Masaru Washio , Kazuhisa Hamagami , Hiroshi Nishikawa
IPC分类号： C21C7/10
CPC分类号： C21C7/10
摘要： A method of producing an ultra-low-carbon steel by using a vacuum degasser on a molten steel has the steps of conducting vacuum decarburization to attain a predetermined level of carbon content, e.g., 25 ppm or below, in the molten steel while progressively reducing the pressure in said vacuum degasser, conducting addition of hydrogen in which hydrogen is dissolved in said molten steel while said pressure is temporarily elevated to 20 Torr or above, and conducting final decarburization after reducing said pressure to 2 Torr or below. The addition of hydrogen may be conducted to meet the following conditions:[H].gtoreq.{([C]-[C]final)/5}+4wherein [H] represents the hydrogen content (ppm) in said molten steel in the state after the addition of hydrogen, [C] represents the carbon content (ppm) in the molten steel in the state after the addition of hydrogen, and [C] final represents the final carbon content (ppm) to be obtained.
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公开(公告)号：USRE32590E
公开(公告)日：1988-02-02
申请号：US922323
申请日：1986-10-23
IPC分类号： B01D53/04 , B01D53/047 , C01B32/40 , C10K1/32
CPC分类号： B01D53/0476 , C01B31/18 , C10K1/32 , B01D2253/102 , B01D2253/108 , B01D2256/10 , B01D2256/20 , B01D2257/102 , B01D2257/104 , B01D2257/108 , B01D2257/502 , B01D2257/504 , B01D2259/40001 , B01D2259/40015 , B01D2259/4003 , B01D2259/40037 , B01D2259/40064 , B01D2259/40066 , B01D2259/40069 , B01D2259/402 , B01D2259/404 , Y02C10/08 , Y02P20/152
摘要： A process for separating carbon monoxide from a feed gas .[.comprising.]. .Iadd.including .Iaddend.CO.sub.2, CO and less adsorbable component than CO through PSA by using at least two adsorption columns in two stage adsorption operation which .[.comprises.]. .Iadd.includes .Iaddend.a first adsorption stage for removing CO.sub.2 from .[.said.]. .Iadd.the .Iaddend.feed gas and a second adsorption stage for separating CO from gaseous mixture withdrawn from the first adsorption stage:(1) the first adsorption stage comprising a pressure swing adsorption repeating adsorption and desorption, and(2) the second adsorption stage comprising:(i) pressurization by the first stage product gas,(ii) adsorption,(iii) depressurization,(iv) purge by product gas,(v) evacuation for recovering product gas, and(vi) pressurization by gas withdrawn in other column, periodically switching the flow between or among .[.said.]. .Iadd.the .Iaddend.columns so as to repeat the above steps in the columns, and a process for separating carbon monoxide from a feed gas .[.comprising.]. .Iadd.including .Iaddend.carbon monoxide and less adsorbable component than CO through pressure swing adsorption by using at least two adsorption columns containing an adsorbent exhibiting selective adsorb property to carbon monoxide which .[.comprises.]..Iadd.includes.Iaddend.:(i) pressurization by feed gas,(ii) adsorption,(iii) depressurization,(iv) purge by product gas,(v) evacuation for recovering product gas, and(vi) pressurization by gas withdrawn in other column, periodically switching the flow between or among .[.said.]. .Iadd.the .Iaddend.columns so as to repeat the above steps in the columns are disclosed.
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公开(公告)号：US4539020A
公开(公告)日：1985-09-03
申请号：US621789
申请日：1984-06-18
CPC分类号： B01D53/047 , C01B31/18 , C10K1/32 , B01D2256/20 , B01D2257/504 , B01D2259/40003 , B01D2259/40064 , B01D2259/40079 , B01D2259/40081 , B01D2259/402 , B01D2259/404 , Y02C10/08 , Y02P20/152
摘要： A process for separating carbon monoxide from a feed gas comprising CO.sub.2, CO and less adsorbable component than CO through PSA by using at least two adsorption columns in two stage adsorption operation which comprises a first adsorption stage for removing CO.sub.2 from said feed gas and a second adsorption stage for separating CO from gaseous mixture withdrawn from the first adsorption stage:(1) the first adsorption stage comprising a pressure swing adsorption repeating adsorption and desorption, and(2) the second adsorption stage comprising:(i) pressurization by the first stage product gas,(ii) adsorption,(iii) depressurization,(iv) purge by product gas,(v) evacuation for recovering product gas, and(vi) pressurization by gas withdrawn in other column,periodically switching the flow between or among said columns so as to repeat the above steps in the columns, and a process for separating carbon monoxide from a feed gas comprising carbon monoxide and less adsorbable component than CO through pressure swing adsorption by using at least two adsorption columns containing an adsorbent exhibiting selective adsorb property to carbon monoxide which comprises:(i) pressurization by feed gas,(ii) adsorption,(iii) depressurization,(iv) purge by product gas,(v) evacuation for recovering product gas, and(vi) pressurization by gas withdrawn in other column,periodically switching the flow between or among said columns so as to repeat the above steps in the columns are disclosed.
摘要翻译： 一种从包含CO 2，CO和较少可吸附成分的进料气体中分离一氧化碳的方法，其通过在两阶段吸附操作中使用至少两个吸附塔，通过PSA至少两个吸附塔，其包括用于从所述进料气体中除去CO 2的第一吸附阶段， 用于从第一吸附阶段排出的气体混合物中分离CO的吸附阶段：（1）第一吸附阶段包括变压吸附重复吸附和解吸，和（2）第二吸附阶段包括：（i）第一阶段加压 产品气体，（ii）吸附，（iii）减压，（iv）通过产物气体吹扫，（v）用于回收产物气体的抽空，和（vi）通过在其它塔中抽出的气体加压，周期性地切换所述 塔，以便重复列中的上述步骤，以及从包含一氧化碳和较少可吸附组分的进料气体中分离一氧化碳的方法比CO 通过使用至少两个含有对一氧化碳具有选择性吸附性质的吸附剂的吸附塔进行变压吸附，其包括：（i）通过进料气加压，（ii）吸附，（iii）减压，（iv） （v）用于回收产物气体的抽空，以及（vi）通过在其他塔中取出的气体加压，周期性地切换所述塔之间或之间的流动，以便重复上述列中的步骤。
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公开(公告)号：US4508571A
公开(公告)日：1985-04-02
申请号：US591030
申请日：1984-03-19
申请人： Hakaru Nakato , Toshikazu Sakuraya , Yasuhiro Habu , Toshihiko Emi , Masanori Kodama , Takao Koshikawa , Yoshimitsu Yoshida , Fumitaka Shimokawa
发明人： Hakaru Nakato , Toshikazu Sakuraya , Yasuhiro Habu , Toshihiko Emi , Masanori Kodama , Takao Koshikawa , Yoshimitsu Yoshida , Fumitaka Shimokawa
IPC分类号： C21C1/00 , B22D11/10 , B22D11/108 , B22D11/111 , B28B7/34
CPC分类号： B22D11/111
摘要： A mold additive for use in the continuous casting is disclosed, which comprises a base material for slag having a chemical composition of CaO--SiO.sub.2 --Al.sub.2 O.sub.3 system, a flux and a carbonaceous aggregate. The mold additive contains 0.5-2.0% by weight of carbon black and 1-4% by weight of activated carbon with an average particle size of not more than 10 .mu.m as the carbonaceous aggregate, and has a bulk density of not more than 0.9 g/cm.sup.3.
摘要翻译： 公开了一种用于连续铸造的模具添加剂，其包括具有化学组成为CaO-SiO 2 -Al 2 O 3体系的渣的基料，助熔剂和碳质聚集体。 模具添加剂含有0.5-2.0重量％的炭黑和1-4重量％的作为碳质骨料的平均粒度不超过10微米的活性炭，并且堆积密度不大于0.9 g / cm3。
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公开(公告)号：US4436287A
公开(公告)日：1984-03-13
申请号：US511511
申请日：1983-07-06
摘要： Wear of tuyeres for refining a molten iron is prevented by blowing a CO-containing gas having the defined flow amount, oxygen gas flow amount and CO gas concentration as a shrouding gas which surrounds a core refining gas flow containing oxygen gas through tuyeres of concentric pipes. As the shrouding gas for cooling and protecting the tuyeres, use may be made of an exhaust gas discharged and recovered from a converter or a blast furnace by controlling the concentrations of CO and N.sub.2 in the exhaust gas to the specific limitations.
摘要翻译： 通过将具有规定流量，氧气流量和CO气体浓度的含CO气体作为围绕通过含有氧气的核心精炼气流的覆盖气体吹入通过同心管的风口来防止风口的磨损 。 作为用于冷却和保护风口的遮蔽气体，可以通过将废气中的CO和N 2的浓度控制在特定的限制条件下，使用从转炉或高炉中排出和回收的废气。
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