• 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:
    A process and apparatus for the preparation of green briquettes for the production of silicon or silicon carbide or ferrosilicon in electric pit furnaces, quartz sand, a carbon carrier and a bituminous binder being mixed together, the mixture being shaped into blanks from which the green briquettes are formed by heat treatment. The process is performed with the use of blanks which are free from melted bituminous caking coal and whose specific weight is made greater than the bulk density of quartz sand by adjustment of the proportions of the mixture and by compacting. The blanks are introduced for the heat treatment into a heated rotating drum furnace whose lower part is filled with quartz sand to an extent such that the heat treatment proceeds in a dip bed of quartz sand.
    公开号:SU1711668A3
    申请号:SU884356242
    申请日:1988-07-22
    公开日:1992-02-07
    发明作者:Ласк Герт-Вильгельм
    申请人:Эпплайд Индастриал Материалз Корпорейшн Аимкор (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to metallurgy, in particular, to a method for producing briquettes for producing silicon, silicon carbide or ferrosilicon in low-mine electric smelting. furnaces.
    The purpose of the invention is to simplify the process while ensuring the high quality of the briquettes by reducing the contamination.
    Example. The method is carried out using blanks containing 35-65 mas of quartz sand with a specific gravity of 1, -1.6 g / cm 3. The bulk density of quartz sand is 1.2 g / cm3 - 1.1 g / cm3.
    The method is carried out on an installation containing a device for forming blanks from quartz sand, a carburizer and a bitumen binder, a device for heat treatment of blanks, made in the form of a rotating tubular furnace, which is heated
    s & oo

    with
    using a torch with a torch directed inside the oven chamber.
    A layer of quartz sand is placed in the furnace to submerge the blanks. This layer is at a level below the position of the burner. There is a recirculation device for quartz sand in the kiln, which is connected to the inlet and outlet of the kiln. The sand from the blanks is separated by a screen. Separated quartz sand in a heated state is reused by feeding the furnace. Before heat treatment, the mixture is preliminarily prepared using rotary tubular mixers and a cooler.
    The mixture is prepared as follows.
    Petroleum coke is fed to the first mixer lined with silicon carbide plates. Petroleum coke contains 6-10% of water, therefore in the first mixer it is thickened and heated. It is made using a portion of silica sand, which is used as a heat carrier in a rotary kiln. This sand has a temperature of 500 ° C. Water evaporation and heating require such energy expenditure that, at approximately equal amounts of petroleum coke and quartz sand, the final temperature is set to about 15 ° C. If this temperature is too low for a subsequent operation that binds the binder, then the gas coming out of the rotating The furnaces can be passed through the first mixer, where it gives up the body and is saturated with vygar. This offgas has a temperature of about 650 ° C. Due to the low oxygen content (less than 1.5%), this gas can make the inert atmosphere of the first mixer. This prevents dangerous situations that could arise from pulverized petroleum coke.
    After passing the first mixer through a filter with a vibrating layer filled with petroleum coke or
    quartz sand, this gas is fed into the chimney. A mixture of sand and petroleum coke, having a temperature of about 200 ° C, is fed to a second mixer, in which: a binder with a temperature of 180-200 C sprays. The temperature is chosen such that the viscosity is low enough to prevent
    25
    at-15
    20 and 4-. ь.
    m 711668
    and ensure uniform distribution of the solids in the mixture. This mixer, as well as the first one, is laid out with silicon carbide plates in the industry to prevent contamination of the product being mixed with impurities. The mixture leaving the second mixer has a high temperature and, to prevent it from sticking to the press parts, the mixture is cooled at 30-5 ° C depending on the binder. The refrigerator is also lined with silicon carbide plates. The cooling is conducted with countercurrent air. The mixture is fed to a press, where molding and controlled blowing are carried out. From the press, the blanks are fed to a heat treatment apparatus, where curing is provided, followed by degassing and preliminary coking of the binder and petroleum coke in the briquette.
    The method is carried out as follows.
    . The rotary tube furnace is filled with quartz sand by volume less than 50%. Heating is then carried out. Starting at 250 ° C, the binder begins to release heavy hydrocarbons. This process generally lasts up to 50 HP. Quartz sand filling consists of two components: the fraction of hot quartz sand returned to the cycle and the fraction of fresh sand. A portion of fresh sand affects the productivity of the process, since the higher the batch production rate per hour, the more fresh sand is required. The heat treatment process is organized in such a way that the temperature rise of the heated gases above 800 ° C is prevented, mainly in continuous flow mode. Processing of blanks by immersion in a layer of quartz sand is possible only with the correct choice of the proportion of blanks. Depending on the proportion of quartz sand and the pressing pressure, the billet is molded with a specific weight of 1.35-1.55 g / cm3. Due to the regulated ratio of the specific weight of the workpieces and sand, the necessary conditions for the degassing of the workpieces and their protection from burnout are achieved.
    The described process allows the binding of coated quartz sand in the finished
    thirty
    (five
    40
    50
    55
    one
    briquette, which, in turn, allows efficient use of the briquettes obtained in low-shaft electric smelting furnaces
    SRI.
    After passing the quartz sand and the finished briquettes obtained from the blanks through the rotary kiln, they are separated from each other by sieving. The briquettes enter the bunker protected from oxygen. A part of the quartz sand required for further production is fed to the first mixer and mixed with petroleum coke and the process is repeated. For the production of silicon, briquette compositions have a molar ratio of quartz sand to carbon. To obtain a carbide. The silica can choose the ratio of quartz sand to carbon as 1: 3.
    The described technology is simple to implement, as it does not require complex pressing and furnace equipment for hot pressing. The proposed method eliminates undesirable contamination of the briquettes with impurities and provides briquettes that meet the chemical and physical requirements imposed on such briquettes in the production of materials based on silicon.
    权利要求:
    Claims (11)
    [1]
    1. A method of making briquettes for producing silicon, silicon carbide or ferrosilicon in low-shaft electric smelting furnaces, including mixing quartz sand, a carburizer and a bitumen binder, forming blanks and heat treatment, characterized in that, in order to simplify the process while ensuring high quality briquettes due to reducing the pollution, the blanks are molded with a bulk weight exceeding the bulk density of quartz sand, and heat treatment is carried out in a rotary tube furnace after molding with the placement I eat blanks in the backfill of quartz sand.
    [2]
    2. Method pop. 1. It is distinguished both by the fact that 1 of the billet is molded from a mixture containing wt.% Of quartz sand, and with a specific gravity of 1, -, 6 g / cm3.
    [3]
    3. Method of method 1, about tl and chajusch and with the fact that during heat treatment in a rotating tubular furnace billet placed in the backfill in isolation, and the volume of quartz sand is twice the volume of the voids of free poured blanks.
    [4]
    k. The method according to claim 1, wherein the heat treatment in a rotary tubular furnace is carried out when the backfill layer is heated to 500 ° C,
    [5]
    5. The method according to claim 1, about t l and h and Yu and тем and the fact that the backfill is heated
    Quartz sand is used repeatedly, with a partial return for each subsequent heat treatment cycle in a rotary tube furnace and fed with a fresh portion of sand.
    [6]
    6. The method according to claim 1, characterized by the fact that during heat treatment in a rotary tubular furnace, the temperature at the inlet to the heated volume is maintained at 200 ° C and at the output 500 ° C.
    [7]
    7. The method according to claim 5, about tl and h a yu and with the fact that the return of backfilling
    before a solid carbon shell is formed on the silica sand particles.
    [8]
    8. Method according to claim 5, about tl and h and yu and so that the return of backfilling
    performed on average three times.
    [9]
    9. The method according to claim 1, about tl and h and u and with the fact that as a carburizer take petroleum coke.
    [10]
    10. The method according to claim 1, of tl and h.a yushi and so that taking as a bitumen binder take oil pitch.
    [11]
    11. The method according to claim 1, wherein the use is made so that the molding of the blanks is carried out by pressing on a press.
    类似技术:
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    JPS56150141A|1981-11-20|Refining method for aluminum by reduction
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    同族专利:
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    ZA884615B|1989-03-29|
    NO883224L|1989-01-25|
    IT1226382B|1991-01-11|
    JPH01164717A|1989-06-28|
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    GB2207441A|1989-02-01|
    FI883235A0|1988-07-06|
    SE8802679D0|1988-07-19|
    JPH05334B2|1993-01-05|
    SE8802679L|1989-01-25|
    AT395578B|1993-01-25|
    IE60425B1|1994-07-13|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3206526A|1962-05-15|1965-09-14|Rygaard Ole Frank|Utilization of cement kiln dust|
    JPS6024047B2|1977-08-18|1985-06-11|Denki Kagaku Kogyo Kk|
    DE3009808C2|1980-03-14|1982-02-18|Coc-Luxembourg S.A., Luxembourg|Process for the production of raw material blanks containing silicon and carbon and the use of the raw material blanks|
    DE3023297C2|1980-06-21|1988-05-05|International Minerals & Chemical Luxembourg S.A., 2010 Luxembourg|Process for the production of a preliminary product for the production of silicon carbide|
    DE3032720C2|1980-08-30|1982-12-16|International Minerals & Chemical Luxembourg S.A., 2010 Luxembourg|Process for the production of silicon from quartz and carbon in an electric furnace|
    US4462794A|1982-11-12|1984-07-31|Intermountain Research & Development|Method of operating a rotary calciner retrofitted to coal-firing|
    GB2130696B|1982-11-16|1986-04-16|Nd Engineering Limited|Improved rotary high temperature reactor|
    DE3411731C2|1983-11-26|1987-07-09|International Minerals & Chemical Corp., Northbrook, Ill., Us|
    DE3506439C2|1985-02-23|1987-09-17|C. Deilmann Ag, 4444 Bad Bentheim, De|
    DE3541125C2|1985-05-21|1988-09-22|International Minerals & Chemical Corp., Northbrook, Ill., Us|
    US4859177A|1988-02-16|1989-08-22|Fuller Company|Apparatus for incinerating combustible material|
    US4957429A|1989-08-18|1990-09-18|Mendenhall Robert Lamar|Method and apparatus for removing volatile hydrocarbons from particulate soils|DE3923446C1|1989-07-15|1990-07-26|Applied Industrial Materials Corp. Aimcor, Deerfield, Ill., Us|
    DE3939018C1|1989-11-25|1991-05-16|Applied Industrial Materials Corp. Aimcor, Deerfield, Ill., Us|Method of making furnace briquettes - has raw sand and carbon carrying material mixes before heating|
    DE4015031C2|1990-05-10|1993-06-17|Kgt Giessereitechnik Gmbh, 4000 Duesseldorf, De|
    FR2668161A1|1990-10-23|1992-04-24|Nufarm Energy Pty Ltd|BRIQUETTES, PREPARATION METHOD AND USE IN SILICON FUSION PROCESSES.|
    EP0527353B1|1991-08-08|1995-06-07|Applied Industrial Materials Corporation Aimcor|Process for the production of silicon in electric low-shaft furnace and green bricks to carry out the process|
    AU2951992A|1991-11-29|1993-06-28|Robin Anthony Kyffin|Heat treatment of expansible materials to form lightweight aggregate|
    DE4214434C1|1992-05-06|1993-07-15|Applied Industrial Materials Corp., Deerfield, Ill., Us|
    DE4314403A1|1992-07-01|1994-01-05|Kloeckner Humboldt Deutz Ag|Process and plant for the production of mechanically and thermally stable, low-gas agglomerates such as briquettes or pellets|
    WO1994002792A2|1992-07-14|1994-02-03|Ash Grove Cement Company|Method for improved manufacture of cement in long kilns|
    US5375535A|1993-01-11|1994-12-27|Ash Grove Cement Company|Method and apparatus for improved manufacture of cement in long kilns|
    RU2689586C1|2018-12-27|2019-05-28|Константин Сергеевич Ёлкин|Method of producing silicon carbide|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE3724541A|DE3724541C2|1987-07-24|1987-07-24|
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