• 专利附录
  • 专利说明
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    • 专利摘要:
    1504917 Fused cyanate nitriding bath CENTRE STEPHANOIS DE RECHERCHES MECANIQUES HYDROMECANIQUE ET FROTTEMENT 16 May 1975 [17 May 1974 10 April 1975] 20918/75 Heading C7O The cyanide content of a fused cyanate bath is kept at a low level by maintaining a sulphur content of 0À001-0À1% and introducing a carbonyl compound at a rate corresponding to 1-25 gm. of CO per kg of bath for every 24 hours operation at a working temperature of 480-650‹C. Sulphur may be added elementally or as sulphide, sulphite, hyposulphite, sulphate or an alkali or alkaline earth metal thiosulphate. The carbonyl compound may be obtained by heating carbamide at 150-450‹C for 3-10 hours and may be added with, or may itself constitute a regenerating agent for cyanate.
    公开号:SU793410A3
    申请号:SU752133389
    申请日:1975-05-16
    公开日:1980-12-30
    发明作者:Гоше Антуан；Гийо Жерар
    申请人:Сантр Стефануа Де Решерш Меканик Гидромеканик Э Фроттеман (Фирма)；
    IPC主号:
    专利说明:

    The state of cyanide reaches close to 10% and is quickly observed. The aim of the invention is to maintain low values of cyanides in an amount of 0.5-1%. To achieve this goal, we propose a method of regenerating salt melts for nitration, mainly containing the cyanate anion as an active substance, by periodically adding a regenerating substance containing at least one carbonyl groups in which a regenerating substance containing at least one carbonyl group is introduced in the amount of 1-25 g per 1 kg of melt every 24 hours and additionally introduced sulfur-containing e substance in the amount of 0.001-0.1%. At the same time, substances whose formula contains at least one carbonic fiber are introduced into the bath simultaneously with the cyanate anion. Substances having at least one carbonyl group are obtained by extracting urea at 150–450 ° C for 3–10 hours. As a sulfur-containing substance, a mixture of sulphides and alkali and / or alkaline earth sulphites, a mixture of sulphide and alkali and / or alkaline earth hyposulitis, a mixture of sulphides and alkaline and / or alkaline earth sulphates, a mixture of sulphides and alkaline and / or alkaline-land thiosulfates. Sulfur is present in an oxidation state of less than two and in an oxidation state higher than zero. This can be done in two ways. For example, a mixture of substances can be introduced into the bath, some of which contain sulfur in the form of S, while others contain it in an oxidized form, for example, a mixture of sulfide and sulfate or a mixture of sulfide, sulfate, etc. Sulfur can be oxidized to baths, for example, by direct exposure to oxygen. This method is most convenient, as you can just blow air into the bath. The presence in the bath of small amounts of a sulfur-containing element by its catalytic action favors the oxidation of cyanides to cyanate. Introduction of a substance to the melt, the chemical formula of which includes the carbonyl group of the type allows the separation of oxygen and CO2 in the melt, which allows the resulting cyanide to be oxidized as shown previous reactions. Studies have shown that reaction (2) and (3) go to the end and their flow rate increases if oxygen introduced into reaction (2) and COj introduced into reaction (3), inputted from the outside and are obtained in most neposredstvenryu bath - oxidation of cyanide uluchschaets if both reactions (2) and (3) occur simultaneously. The good news is that a substance having a carbonyl group in its formula is added at the same time as the reducing agent of the known cyanate anion. This makes it possible to reduce the loading of the bath, more than one favorable circumstance, that the substance, having in its formula a carbonyl group, also has a reducing agent of the cyanate anion, for example with one or more amine or amide groups. For example, you can apply a mixture of substances obtained by burning urea at 150-450 ° C for 3-10 hours. Example 1. A bath is used with the following initial weight composition: CO2 - 25%, CNO- 35%, 20%, 20%. After 24 hours of heating at ± 5 ° С, the composition of the bath was as follows: COz - 297о, 25%, 6%, 20%, 20%. In the bath vils cyanide. In the long term, cyanides continue to increase. According to the invention, 0.037, KjS and 0.5% biuret of a structural formula are added to the bath: 0 ° C After 24 hours of heating at a temperature of 565 ± 5 ° C, the bath composition becomes as follows: SOG - 25.2%, 34.8%, CN 0.08%, Na - 20%, K - 20% and practically remains constant. The content of cyaniums in the bath is almost zero. The cyanide content remains extremely low and after prolonged exposure to temperature, provided that on one side the above-mentioned content of KjS is maintained, and on the other side of CTOpoin i, biuret is added to the bath, for example, 0.5% by weight of the bath 24 hours of maintenance, at a temperature that corresponds to 2.6 g per 1 kg of bath. Example 2. Take the same bath as in example .1. According to the invention, 0.01% K2S, 0.3% salt obtained by calcining urea for 10 hours at 240 ° C is added to the bath. After 24 hours of heating at 565 ± 5 ° С, the bath composition is as follows: CO., - 25.1%,, 85%, CN - 0.05 g, 20%.
    权利要求:
    Claims (7)
    [1]
    The claims of the non-group containing group, with the goal of supporting 0.5-1%, regeneration yO = <,
    The corresponding number of links added per 1 kg of bath for 24 hours at a temperature of 565 + 5 ° C is 1.5 g.
    Example 3, A bath of alkaline carbonates and cyanates has the following weight composition: CNO'- 35%, CO - 20%, Li + - 1.2%, Na * - 18.3%, K * - 24%, S - 0.02%, SO - 0.05%.
    After 24 hours of heating at 570 ° C, the composition of the bath becomes the following f
    CNO- 34.8%, СО / '- 202%, Li - 1.2%, “g
    Na * - 18.3%, K * - 24%, S a - 0.01%, SO - 0.04%, CN ”- 0.04%.
    Such a bath is very stable as a result of the presence of sulfur (in this case Sc £), which avoids the formation of cyanides.
    If oxidized sulfur SO ] Is not added to the bath and the rest is left unchanged, then the cyanide content in the bath after 24 hours of heating will become approximately 1%.
    But on us,
    After 24 hours of heating at 570 ° C, the composition becomes as follows:
    CNO “- 34.85; CO - 20.14%, Li - 1.2%, Na * - 13.3%, K + - 24%, s' 1 - 0.01%, SO - 0.05%, CN ~ - 0.05%.
    and MER 4. The above-described I5nb without oxidized sulfur is taken. About 0.5 l / hr per kg of water into this bathtub vanVNIIIPI Order 9640/69 ’
    1. A method of regenerating salt melts for nitration, mainly containing an anionic cyanate as an active substance, by periodically adding a regenerating substance, less than one carbonylated, wherein cyanide is present in an amount of a substance containing at least one g of arbosene group in an amount 1 to 25 g per 1 kg of melt every 24 hours is additionally introduced sulfur-containing substance in the amount of 0 £ 10-1 ^ 0.1%.
    [2]
    2. The method according to π. 1, the fact that a substance containing at least one carbonyl group is introduced into the bath simultaneously with the anion of cyanate.
    [3]
    3. The method of pop. 1, characterized in that substances having at least one carbonyl group are obtained by holding urea at 150-450 ° C for 3-10 hours.
    [4]
    4. The way popp. 1, 2 and 3, characterized in that as a sulfur-containing substance, a mixture of sulfides and alkaline and / or alkaline-earth sulfites is introduced into the bath.
    [5]
    5. The method according to PP. 1, 2 and 3, characterized in that as a sulfur-containing substance, a mixture of sulfides and alkaline and / or alkaline-earth hyposulfites is introduced into the bath.
    [6]
    6. The method according to PP. 1,2iZ, characterized in that as a sulfur-containing substance, a mixture of sulfides and alkaline and / or alkaline-earth sulfates is introduced into the bath. .
    [7]
    7. The way popp. 1, 2 and 3, characterized in that a mixture of sulfides and alkaline and / or alkaline-earth thiosulfates is introduced into the bath.
    Priority by signs:
    05/17/74
    04/10/75
    Circulation 1074 on PP. 1 and 2;
    p. 4 ^ -7.
    Subscription
    PPP ’: Patent Branch, Uzhhorod, st. Project, 4
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    同族专利:
    公开号 | 公开日
    AR202685A1|1975-06-30|
    DE2521903A1|1975-12-04|
    NL7505638A|1975-11-19|
    CH606476A5|1978-10-31|
    SE429448B|1983-09-05|
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    DD118445A5|1976-03-05|
    JPS596911B2|1984-02-15|
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    NL178981B|1986-01-16|
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    DE2521903C2|1982-05-27|
    US4006043A|1977-02-01|
    BR7503026A|1976-04-13|
    SE7505532L|1975-11-18|
    CA1049908A|1979-03-06|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE883543C|1947-02-19|1953-07-20|Applic Des Traitements De Surf|Process for the production of surface layers of high wear resistance on objects made of iron alloys|
    US2562065A|1950-11-29|1951-07-24|American Cyanamid Co|Carburizing salt bath|
    US2801154A|1953-12-31|1957-07-30|Ethyl Corp|Preparation of metal cyanates|
    US2875095A|1956-10-06|1959-02-24|Gold Und Silber Scheldeanstalt|Method of producing surface layers resistant to wear|
    US3022204A|1961-03-20|1962-02-20|Kolene Corp|Process for nitriding metals|
    FR1406530A|1964-05-28|1965-07-23|Hydromecanique Et Frottement S|Process for the treatment of metal surfaces and products thus treated|
    US3303063A|1964-06-15|1967-02-07|Gen Motors Corp|Liquid nitriding process using urea|
    DE1263447B|1964-06-15|1968-03-14|Gen Motors Corp|Process for the production of a cyanate molten salt bath for the case hardening of steel|IL52591A|1977-07-25|1980-07-31|Israel Aircraft Ind Ltd|Method of surface hardening stainless steel parts|
    DE3300488A1|1983-01-08|1984-07-12|Degussa Ag, 6000 Frankfurt|REGENERATION AGENT FOR CARBON SALT BATHS AND METHOD FOR THE PRODUCTION THEREOF|
    FR2688517B1|1992-03-10|1994-06-03|Stephanois Rech|PROCESS FOR THE PHOSPHATION OF STEEL PARTS, TO IMPROVE THEIR CORROSION AND WEAR RESISTANCES.|
    FR2693520B1|1992-07-10|1994-09-30|Stephanois Rech Mec|Cushion for heavily loaded joints or bearings, with a rolled strip hooped lining.|
    FR2708623B1|1993-08-06|1995-10-20|Stephanois Rech Mec|Nitriding process for ferrous metal parts, with improved corrosion resistance.|
    US5576066A|1993-08-10|1996-11-19|Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement|Method of improving the wear and corrosion resistance of ferrous metal parts|
    FR2715943B1|1994-02-09|1996-05-15|Stephanois Rech Mec|Composition of salt baths based on alkaline nitrates to oxidize ferrous metal and thus improve its resistance to corrosion.|
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    DE19832404C1|1998-07-18|1999-10-21|Houghton Durferrit Gmbh|Production of cyanide from nitrocarburised melts containing cyanate by electrolysis|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR7417195A|FR2271307B1|1974-05-17|1974-05-17|
    FR7511166A|FR2307051B2|1975-04-10|1975-04-10|
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