• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to ferrous metallurgy, in particular, to methods for the extra-furnace desulfurizing treatment of cast iron and to become active sulfur absorption compounds of calcium and to methods for preparing a desulfurizer. The aim of the invention is to improve the quality of the desulfurizer and the efficiency of metal refining. A desulfurizer is obtained on the basis of calcium carbide by mixing with lime so that grains of calcium carbide and lime remain in the most active state. For this, a melt of calcium carbide is obtained, and lime is admixed to it to its content of 20-80 wt.% In the mixture. Melt mixture of this composition is also obtained by calcining lime with coke. The melt is released into molds, the resulting blocks are cooled to a temperature in the range of 400 ° C to that of complete solidification and crushed at these temperatures. Then lime is mixed into the crushed block to a total content of 4590 wt.% And after cooling to 1060 ° C the mixture is ground in a stream of air or nitrogen with a humidity corresponding to 5-20 g / m at 15 ° C. 3 zp y: about with
    公开号:SU1269739A3
    申请号:SU803221904
    申请日:1980-12-26
    公开日:1986-11-07
    发明作者:Браун Альберт；Портц Вилли；Штраусс Георг；Делей Ханс-Мартин
    申请人:Хехст Аг (Фирма)；Крупп Шталь Аг (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to ferrous metallurgy, in particular to extra-furnace desulfurization of cast iron and become active sulfur-absorbing calcium compounds and to methods for preparing a desulfurizer.
    The purpose of the invention is to improve the quality of the desulfurizer and the efficiency of metal refining.
    The desulfurizer is obtained mainly on the basis of calcium carbide by mixing with lime so that the grains of calcium carbide and lime remain in the most active state. For this, a melt of calcium carbide is obtained, lime is mixed into it to its content in a mixture of 20-80 wt.%. A melt of a mixture of this composition is also obtained by calcining lime with coke. The melt is poured into molds, the resulting blocks are cooled to a temperature of from 400 ° C to the temperature of complete solidification and crushed at these temperatures. Then, the crushed mixture is admixed lime to its total content in the mixture of 45 90 wt.%, And after cooling to 10-60S mixture was milled in a stream of air or nitrogen with a moisture content corresponding to 5-20 g / m 3 at 15 ° C to a particle size less than 10 mm.
    As the initial mixture, a mixture of calcium carbide with 45-80 wt.% Lime can be used.
    An advantage of the desulfurizer obtained according to the invention is that individual CaO grains are in close proximity to CaC 2 grains, as a result of which the sulfur removal reaction begins very early and evenly. As a result, small amounts of desulfurizer are required and the desired results are achieved.
    Example 1. From the usual to obtain carbide melt with a CaC 2 content of 80 wt.% And CaO 20 wt.% In the crucible by cooling this melt, a carbide block of the corresponding composition was obtained. After cooling the block to an average temperature of about 600 ° C, it is subjected to preliminary grinding to pieces of size less than Ί50 mm and so much lime with particle sizes of 8-60 mm is added to carbide having a temperature of 500 ° C that the resulting mixture has a CaO content of 50 wt. %
    Then, this mixture, when passing air 1500 m 3 / h with a moisture content of 10 g / m 3 at 15 ° С, is subjected to grinding in a rotary mill with a productivity of 500 kg / h at 50 ° С for particles smaller than 100 microns.
    Using 1500 kg of this product, 300 tons of molten iron containing 10 0.03% sulfur are subjected to desulfurization, the removal of sulfur being carried out in a known manner. The sulfur content in the treated metal is less than 0.005 wt.%.
    Example 2, In a known manner, calcium carbide is obtained thermally from lime and coke 15, and the ratio of lime to coke in the charge is 110: 40, which corresponds to a carbide with a CaO content of about 20 45 wt.%.
    Lime is added to the produced stream of molten calcium carbide in pieces with a size of 3–8 mm in an amount ensuring a content of 25 CaO in the crucible of about 80% (per 1 ton of produced stream about 1.2–1.3 tons of CaO).
    After the crucible is cooled to a temperature not lower than 600 ° С, which is reached after 4 hours, the block is subjected to preliminary grinding to a piece size of less than 150 mm, then lime is added to this hot mixture with a piece size of 8-60 mm in such a quantity of 35 that the average CaO content is 90 wt.%. Then, when passing air in an amount of 1500 m 3 / h with a moisture content of 10 g / m 3 (at 15 ° С) in a rotary mill with a productivity of 500 kg / h at 50 ° С, the mixture is ground to obtain particles smaller than 100 μm.
    Using this mixture with a calculation of 45 on the content of calcium carbide achieved the same results on desulfurization, as in example 1.
    权利要求:
    Claims (4)
    [1]
    The invention relates to non-ferrous metallurgy, in particular, to the desulfurization of cast iron and become active sulfur-absorbing calcium compounds and to methods for preparing a desulfurizer. The purpose of the invention is to improve the quality of the desulfurizer and the efficiency of metal refining. A desul efurator is obtained on the basis of calcium carbide by mixing with lime so that the grains of calcium carbide and lime remain in the most active state. For this, a melt of calcium carbide is obtained, and lime is mixed into it to its content in a mixture of 20-80 wt.%. The melt mixture of this composition is also obtained by calcining lime with coke. The melt is released into the molds, the resulting blocks are cooled to a temperature of 400 ° C to the fully solidified temperature and crushed at these temperatures. Then the mixture is mixed with a mixture known to 4590 wt. .% and after cooling to 10-60, the mixture is ground in a current of air or nitrogen with a moisture content corresponding to 5-20 g / m at 15 ° C to a particle size less than 10 mm. As the initial mixture, a mixture of carbide cali cal with 45-80 wt.% Lime can be used. The advantage of the desulfurizer obtained according to the invention is that individual CaO grains are in the immediate vicinity of CaC grains, as a result of which the sulfur removal reaction starts from very early and evenly. Because of this, small amounts of desulphurizer are required and the desired results are achieved. Example 1. A carbide block of the corresponding composition was obtained from a melt which is common to produce carbide with a CaC2 content of 80 wt.% And CaO 20 wt.% In a crucible by cooling this melt. After cooling, the block, on average, to a temperature of about 600 ° C, is subjected to preliminary grinding to pieces less than 150 mm in size, and so much lime with particle sizes of 8-60 mm is added to a carbide having a temperature of 500 ° C that the resulting mixture has a CaO 50 content wt% 1 92 Then this mixture, when passing air 1500 n 1 h with a moisture content of 10 g / m at 15 ° C, is subjected to grinding in a rotary mill with a productivity of 500 kg / h at 50 ° C into particles less than 100 microns in size. Using 1500 kg of this product, 300 tons of molten iron containing 0.03% of sulfur are desulfurized, and the removal of sulfur is carried out in a known manner. The sulfur content in the treated metal is less than 0.005% by weight. Example 2 Calcium carbide is thermally obtained from lime and coke, and the ratio of lime to coke in the charge is 110: 40, which corresponds to a carbide with a CaO content of about 5% by mass. To the jet of molten carbide being released, a grain of lime is added in pieces with a size of 3-8 mm in an amount that provides about 80% of CaO in the crucible (for 1 ton of jet produced, about 1.2-1.3 tonnes of CaO). After cooling the crucible to a temperature not lower than 600 ° C, which is already achieved after 4 hours, the block is subjected to preliminary grinding to a lump size less than 150 mm, then lime is poured on this hot mixture with lump size 8-60 mm in such quantity that the average content is CaO is 90 wt.%. Then, by passing air in an amount of 1500 m / h with a humidity of 10 g / m (at 15 s) in a rotary mill with a capacity of 500 kg / h at 50 ° C, the mixture is milled to obtain particles with a size of less than 100 microns. Using this mixture based on the content of calcium carbide, the same results on desulfurization were achieved as in Example 1. Formula from Gain 1. A method for producing a desulfurizer for cast iron and steel, including the production of a melt containing 2080% by weight of lime from a mixture of carbide calcium and lime by treating; coke during heating, melt being released into molds, cooling the resulting blocks, crushing to a particle size less than
    3
    150 mm and milling at 10-60 ° C, characterized in that, in order to improve the quality of the desulfurizer and the efficiency of metal refining, the hardened block is crushed at a temperature in the range from to the fully solidified temperature, immediately after crushing, lime is added to the total content it is in a mixture of 4590 wt.%, and after cooling, the mixture is milled in a stream of air or nitrogen with a humidity corresponding to 520 g / m at 15 ° C to a particle size less than 10 mm.
    697394
    [2]
    2. The method according to claim 1, about tl and h and y and the fact that to the pre-ground mixture add coarse lime with a size of pieces of 8-60 mm.
    [3]
    3. The method according to claim 1, characterized in that the initial melt is obtained from a mixture of calcium carbide and calcium oxide with a calcium oxide content of 45-80% by weight.
    [4]
    4. Method according to paragraphs. 1-3, characterized in that the mixture is subjected to grinding to the grain size
    15 less than 100 microns.
    类似技术:
    公开号 | 公开日 | 专利标题
    US4395282A|1983-07-26|Desulfurization mixture and process for making it
    SU1269739A3|1986-11-07|Method of producing desulfurizer for cast iron and steel
    US4318822A|1982-03-09|Production of agent for desulfurizing crude iron and steel melts
    EP0040044B1|1985-02-20|Method for the manufacture of desulphurisation agents
    JPH06157087A|1994-06-03|Method of producing cement base and cement composition containing said base
    CA1154596A|1983-10-04|Desulfurizing agent and process for its manufacture
    US4323392A|1982-04-06|Agent for desulfurizing crude iron and steel melts, and process for making it
    KR100759862B1|2007-09-18|Steel refinery flux composition of low temperature form
    US2710796A|1955-06-14|Method of making iron bearing material for treatment in a blast furnace
    US2020171A|1935-11-05|Cast iron and the manufacture thereof
    US3770469A|1973-11-06|Process for preparing self-disintegrating products containing dicalcium silicate
    SU850711A1|1981-07-30|Method of preparation of thin concentrates for sintering
    JPS55125240A|1980-09-26|Sintering method for finely powdered starting material for iron manufacture
    US4400292A|1983-08-23|Process for making agents for desulfurizing crude iron or steel melts
    CA1149618A|1983-07-12|Process for the manufacture of desulfurizing agentsfor crude iron or steel melts
    SU874691A1|1981-10-23|Method of producing slag-generating material for steel treatment
    SU1736609A1|1992-05-30|Method of processing of solid metallurgical slags
    JPH09279260A|1997-10-28|Method for agglomerating iron ore
    SU675081A1|1979-07-25|Method of producing slag-forming granules for steel-making production
    SU645599A3|1979-01-30|Method of obtaining strengthened pellets from materials containing iron oxide
    RU2181385C1|2002-04-20|Method for making briquettes for metallurgical conversion
    SU1164298A1|1985-06-30|Method of producing slag-forming granules for steelmaking industry
    SU906960A1|1982-02-23|Cement for agglomeration and briquetting of ore concentrates
    SU631447A1|1978-11-05|Method of obtaining calcium carbide
    SU648328A1|1979-02-25|Exothermal slag-forming composition for teeming metal
    同族专利:
    公开号 | 公开日
    AU532989B2|1983-10-20|
    DK550880A|1981-06-30|
    DK151569C|1988-05-30|
    JPS5698413A|1981-08-07|
    DD155527A5|1982-06-16|
    NO153500B|1985-12-23|
    DE2952686A1|1981-07-02|
    MX154954A|1988-01-14|
    AT9101T|1984-09-15|
    BR8008500A|1981-07-14|
    PL228751A1|1981-09-04|
    AU6585480A|1981-07-09|
    EP0031534A1|1981-07-08|
    JPS6327406B2|1988-06-02|
    DK151569B|1987-12-14|
    DE3069043D1|1984-09-27|
    NO153500C|1986-04-02|
    EP0031534B1|1984-08-22|
    NO803924L|1981-06-30|
    PL125648B1|1983-06-30|
    US4368071A|1983-01-11|
    ES8200146A1|1981-11-01|
    ES497685A0|1981-11-01|
    ZA808064B|1982-01-27|
    IN153342B|1984-07-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    AT264560B|1966-08-25|1968-09-10|Gustav Dipl Ing Wolfram|Basic steelmaking process|
    DE1758250B1|1968-04-29|1971-10-28|Sueddeutsche Kalkstickstoff|Agent for the desulphurisation of iron melts|
    DE1919414C3|1969-04-17|1978-03-02|Hoechst Ag, 6000 Frankfurt|
    DE1935567B2|1969-07-12|1971-05-13|Knapsack AG, 5033 Hurth Knapsack|PROCESS FOR THE PRODUCTION OF CALCIUM CARBIDE OF CERTAIN QUALITY|
    DE2037758C3|1970-07-30|1979-08-02|Hoechst Ag, 6000 Frankfurt|Process for the production of calcium carbide for the desulfurization of metal melts|
    DE2252795C3|1972-10-27|1982-09-09|Skw Trostberg Ag, 8223 Trostberg|Desulphurizing agent for pig iron and ferro-alloy melts|
    DE2326539C3|1973-05-24|1975-11-13|Sueddeutsche Kalkstickstoff-Werke Ag, 8223 Trostberg|Process for the production of a desulphurisation mixture for iron melts from calcium carbide and at least one water-containing substance|
    FR2432550A1|1978-08-04|1980-02-29|Sueddeutsche Kalkstickstoff|PROCESS FOR THE MANUFACTURE OF AN EASILY FLOWABLE PULVERULATED DESULFURIZATION MIXTURE|
    DE2907069C3|1979-02-23|1981-12-10|Krupp Stahl Ag, 4630 Bochum|Agent for the desulfurization of metal melts|
    DE2919324A1|1979-05-14|1980-12-04|Hoechst Ag|DEHANIZER FOR RAW IRON AND STEEL MELTING AND A METHOD FOR THE PRODUCTION THEREOF|
    DE2920353A1|1979-05-19|1980-11-27|Hoechst Ag|METHOD FOR THE PRODUCTION OF DEHANIZING AGENTS FOR CRUDE IRON OR STEEL MELT|ES8200147A1|1979-12-29|1981-11-01|Hoechst Ag|Desulphurising composition and process for its production.|
    DE3111510A1|1981-03-24|1982-10-07|Hoechst Ag, 6000 Frankfurt|DESULFURATION MIXTURE AND METHOD FOR THE PRODUCTION THEREOF|
    DE3111509A1|1981-03-24|1982-10-07|Hoechst Ag, 6000 Frankfurt|METHOD FOR THE PRODUCTION OF DESULFURING AGENTS FOR BOD IRON OR STEEL MELT|
    CA1243646A|1984-12-04|1988-10-25|William K. Kodatsky|Method for treating carbide-based desulfurizingreagents for injection into molten iron|
    PL213251B1|2009-02-02|2013-02-28|Akad Gorniczo Hutnicza|Method of manufacturing slag-forming mixture for the secondary steel refining in a ladle or in a ladle furnace|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19792952686|DE2952686A1|1979-12-29|1979-12-29|METHOD FOR THE PRODUCTION OF DESULFURING AGENTS FOR BOD IRON OR STEEL MELT|
    [返回顶部]