• 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 method of producing crude iron from sulphidic iron-containing material, where an iron sulphide containing material is charged to a furnace space and there, together with a silica containing material and oxygen, is smelted to an iron-silicate smelt during combustion of sulphidebound sulphur present, so that said smelt contains approximately 70-90% by weight iron calculated as iron (II) oxide. To the smelt is then added a reducing agent in a manner such that the iron content calculated as iron (II) oxide falls to approximately 60% by weight or lower in the presence of lime and/or other fluxing agents and that formed crude iron is separated. The iron content of the iron silicate smelt is then increased by adding further iron sulphide containing material and oxygen for smelting and reducing agent for another reduction.
    公开号:SU976855A3
    申请号:SU792807713
    申请日:1979-08-21
    公开日:1982-11-23
    发明作者:Арвид Петерссон Стиг
    申请人:Болиден Актиеболаг (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to methods for producing crude iron from a sulfide iron-containing material, preferably pyrite and pyrrhotite.
    There is a method in which g is carried out by loading pyrite into a furnace for melting crude pyrite together with silica, such as silica sand, and their autogenous melting when gaseous oxygen or bypass air is supplied to the furnace in order to obtain mainly iron silica · molten melt. At. large quantities of non-ferrous metals using this method can prevent the combustion of jj sulfur until the process is completed. Thus, non-ferrous metals having a greater affinity for sulfur than iron will form a matte of non-ferrous metals, usually * present in pyrite as 20 impurities [1].
    The closest in technical essence and the achieved result is a method of processing sulfide iron-containing materials, including loading the material into the furnace together with a silicon compound, melting to form an iron-silicate melt in suspension by burning with oxygen-containing gas bound to sulfur sulfide [2] .
    The disadvantages of the known methods are High energy costs and losses of valuable non-ferrous and noble metals that cannot be recovered from pyrite slag.
    'The invention is the production of crude iron and sulfur dioxide at low energy costs. .
    This goal is achieved by the fact that according to the method of processing sulfide iron-containing materials, including loading the material into the furnace 'together with a silicon compound, melting to form an iron-silicate * melt in suspension by burning with oxygen-containing gas bound to sulfur sulfide, the formation of the iron-silicate melt is carried out to the content in it of 70-90% YeoO by weight, after which it is reduced to a content of <60% FeO by introducing a reducing and fluxing reagents, then from elyayut formed iron from ferriferous melt in zone 5 of addi piav- charged iron oxide material.
    Pyrite slag is used as the iron oxide material.
    B. As iron oxide material, iron ore concentrates are used.
    The process is carried out in mutually separated melting and reduction furnaces. fifteen
    Reducing and oxygen-containing gases are injected through spears or lances.
    The drawing shows a furnace for processing sulfide materials., 20
    Pyrites are loaded into furnace 1 through loading means 2 together with other iron raw materials, for example, iron ore concentrates of pyrite slag, in the form of hepatitis or magnetite 25, in such quantities that the iron content in the fayalite slag, which was returned to furnace 1 with . recovery stages. iron increased from about 40-60% FeO, or in the presence of lime also from a low present, ”up to about 70-90%, preferably up to about 85% by weight — FeO calculated from iron oxide ... .
    By adding oxygen or oxygen-enriched air through a pipe 3, the sulfur contained in pyrite is burned and heated in the shaft 4 of the melting furnace in a rotational state during the process, the added * 4Q iron-containing sulfide material is melted and form a bath 5 containing mostly fayalit.
    The iron-containing sulfide material usually contains non-ferrous metals ^ (copper, nickel and cobalt) that form. sulfide phase 6, where any noble metals may be present. The sulfide phase is insoluble in oxide fayalitic slag, . it has a greater specific gravity than slag and, therefore, is collected in suspension at the bottom of the melting furnace, from where it can be released through pipeline 7 at regular intervals. Part of the 'present mouse- & yak, antimony and bismuth will be removed during the melting process, and part dissolved in the sulfide phase.
    Iron-rich slag containing Si O 2 and FeO is then transferred through a pipeline. 8 to a reduction furnace 9, where the crude iron is reduced by a known method — by reduction smelting, i.e. introducing oxygen through conduit 10 and a reducing agent (carbon, oil, natural gas, etc.) into the slag melts through conduit 11. Reduced crude iron forms a layer 12 below the slag layer 13. Crude iron is removed from the furnace through the outlet 14.
    During the reduction process, the iron content in 510 ^ - re - slag 13 decreases to the lower limit, but not lower than 60% (in the presence of lime). Then, the slag is returned through the pipeline to the melting furnace 1 in suspension, after the first discharge of a certain amount of slag through the pipeline in order to prevent the formation of impurities in the slag.
    Containing 50 2 gas obtained during the suspension smelting process is removed from the furnace through the gas outlet 17 and transferred to the sulfuric acid or liquid sulfur dioxide production plant after the gas has been treated in a heat exchange process and purified from dust in a known manner.
    Preferred iron-containing sulfide materials are pyrite and pyrrhotite. Iron-containing ma-. Oxide-type materials, such as pyrite slag and iron ore concentrates, can be added and fused with excess heat generated during autogenous melting of the sulfide material. Due to the harsh reduction conditions prevailing during the reduction melting process, the zinc present is vaporized in the form of metal vapor and can subsequently be recovered in a dust filter, followed by oxidation of the metal to zinc oxide in a known manner. Thus, the method allows the separation and extraction of non-ferrous metal in the crude iron.
    If slags containing Fe f obtained from the conventional method of pyrite roasting are submerged in a melting furnace, it is necessary that magnetite does not form during the melting process, in quantities greater than approximately 5% by weight of the total amount of slag .
    976855 6
    EXAMPLE 1. 1000 kg of pyrite is melted in a melting furnace in suspension • 2 in the presence of 1609 N m of air enriched with oxygen (31, 7% oxygen). An iron-rich oxide slag is obtained with a temperature of 1450 ° C and a composition of 80, 8% oxygen and 20.0% Si 0 2 .
    The resulting slag is transferred to a reduction furnace and 356 kg of coke are recovered, which is introduced together with 241 N m 3 of gaseous oxygen. Unrefined iron is obtained with 4% by weight of carbon and a temperature of 1250 ° C, and in addition, slag with 60% iron oxide U . fifteen
    PRI me R 2.
    In a melting furnace, 1000 kg of pyrite ore of approximate composition is melted in suspension,%: ₽ 45;
    S 50; 5i O 2 1.4; CaO 3.6, using 20 1554 N m 3 oxygen-enriched air (31.7% by weight of oxygen '). 813 kg of iron-rich oxide slag with a temperature of 1450 ° C and containing 81, 2% ReO are obtained; 12.5% Si 0 2 and 25
    6.3% CaO.
    The resulting slag is converted into the reducing furnace, and reduced 361kg .koksa which is introduced together with the 2 • N 58 m3 oxygen-gas 30 obtained 438.5 kg of crude iron from 4% carbon by weight at a temperature 1250 ° C and 270 kg slag containing 41.0% ReO; 38.7% Si O 2 and 18.4% CaO.
    179 kg of the specified amount of sludge-35 ka are recycled to the melting furnace in suspension to extract silica and heat during the next loading of pyrite ore. 92 kg of slag was lost as a leak. The method allows the use of pyrite concentrates as a raw material for the extraction of sulfur dioxide, and for the extraction of iron. The main source of energy is the ce-45 pa pyrite concentrate, which is much cheaper than high-quality fuels such as coal, coke, oil and gas. Heat losses are also reduced, which are quite large when crude iron is obtained by known methods, since the silica contained in the slag is returned to the melting furnace in suspension in the molten state and, consequently, heat losses through the slag are mainly arranged nyayutsya. In addition, it is possible to use fine-grained iron raw material, which is not used in the production of iron, for example, in a shaft furnace, in which the material must be loaded in the form of an agglomerate.
    权利要求:
    Claims (5)
    [1]
    3.976 I will hang up, after which it is reduced to 6O% FeO content by introducing a reducing and pressurizing reagents, then the formed iron is separated from the gel-silicate melt and an iron oxide material is additionally charged to the nnaB zone. As an iron oxide oxide material, pyritic slags are used. B. Iron oxide concentrates are used as iron oxide materials. The process is carried out in mutually separated melting and recovery furnaces. Reducing and oxygen (the coagulating gases are injected through a spear or tuyeres. The drawing shows a furnace for processing sulphide materials.,. Pyrites are loaded into furnace 1 through charging means 2 together with other iron raw materials, for example, iron ore pyrite slag concentrates, hepatitis or magnetite, in such quantities that the iron content in the slag was returned to the furnace at the 1st stage of the reduction stage, the iron increased from approximately 40-60% FeO, or in the presence of lime low, up to about 70-90%, preferably up to about 85% by weight of FeO calculated from iron oxide. P. Adding oxygen or oxygen-enriched air through conduit 3 containing pyrite sulfur is burned and heated in the shaft 4 of the melting furnace in a rotary state during the process, the additional iron-containing sulphide material melts and forms a bath S containing mainly fillet. The iron-containing sulfide material usually contains non-ferrous metals (copper, nickel, and cobalt), which form the sulfide phase 6, where any noble metals can be represented. The sulphide phase is insoluble in felted oxide slag, has a larger proportion of slag and, therefore, is collected in suspension at the bottom of the smelting furnace, from where it can be released through conduit 7 at regular intervals. A portion of the present mixture, antimony and bismuth will be removed during the smelting process, and a part will be dissolved in the sulfide phase. 5 The iron-rich slag containing and Fie O is then transferred through a pipeline. 8 in a reduction furnace 9, where the crude iron is reduced to lime by means of reduction smelting, i.e. introducing oxygen through conduit 10 and reducing agent (carbon, oil, natural gas, etc.) into the molten slag through pipe 11. Reduced crude iron forms layer 12 below slag layer 13. Crude iron is removed from the furnace through outlet 14. During the reduction process, the iron content in SiOj. - slag 13 is reduced to the lower limit, but not lower than 60% (in the presence of lime). The slag is then recovered through line 15c of the melting furnace 1 in a suspended state, after the first discharge of a certain amount of slag through line 16, in order to prevent the formation of impurities in the slag. Gas containing ZO, produced during the melting process in suspension, is removed from the furnace through gas outlet 17 and transferred to the sulfuric acid or liquid sulfur dioxide plant after processing the gas in a heat transfer process and cleaning it from dust in a known manner. . Preferred iron-containing sulfide materials are pyrite and pyrrhotite. Iron-containing ma-. Oxides of the oxide type, such as pyrite slags and iron ore concentrates, can be added and fused with an excess of heat obtained during autogenous sulphide sulphide material. Due to the severe reduction conditions prevailing during the recovery melting process, the zinc present is evaporated in the form of Metal vapors and can be subsequently extracted in a dust filter followed by metal oxidation; 1a to zinc oxide in a known manner. In this way, the method allows the separation and ironing of a non-ferrous metal in the crude iron. If slags containing Fe, obtained from the conventional pyrite firing method are swapped into a melting furnace in a vaasified state, then it is necessary that magnetite during the smelting process does not form EEG in quantities greater than about 5% by weight of the total slag . Example. 1000 kg of pyrite are melted in a melting furnace in suspension in the presence of 1609 N m of oxygen-enriched air (31.7% oxygen). An iron-rich oxide slag is obtained with a temperature of 145 ° C and a composition of 80, 8% FeO and 20.0% Si 0-2. The resulting slag is transferred to a reduction furnace and 356 kg of coke is reduced, which is introduced together with 241 N m of gaseous oxygen. Raw iron is obtained with 4% by weight of carbon and a temperature of 12–50 ° C and, moreover, slag with 60% oxide iron and. EXAMPLE 2. In a melting furnace, in a suspended state, 10OO kg of pyrite ore of approximate composition are melted,%: Pe 45; 5 50; 9iO2 1.4; CaO 3.6, using 1554 N m of oxygen-enriched air (31.7% by weight of oxygen). 813 kg of iron-rich oxide slag with a temperature of 145 ° C and containing 81, 2% FeO; 12.5% 5i Og and 6.3% CaO. The resulting slag is converted into a reducing furnace and 361 kg of coke is reduced, which is introduced together with 2 58 -N m of gaseous oxygen. 438.5 kg of crude iron is obtained with 4% carbon by weight with a temperature of 1250 ° C and 270 kg of slag containing 41.0% PeO 38.7% SiO and 18.4% CaO. 179 kg of this amount of slag is recycled into the smelting furnace in a suspended state to extract silica and heat at the next pyrite ore loading. 92 kg of slag was missed as a leak. The method allows the ET to use pyrite concentrates both as raw materials for the recovery of sulfur dioxide and for the extraction of iron. The main source of energy is sulfur contained in pyrite concentrate, which is much cheaper than high-quality fuels, such as coal, coke, oil and gas. Heat losses are also reduced, which are quite large when untreated iron is produced by known methods, since the silica contained in the slag is returned to the smelting furnace in a suspended state in the molten state and, therefore, heat loss through the slag is largely eliminated. In addition, it is possible to use fine-grained iron raw material, which is not used in the production of iron, for example, in a shaft furnace, into which the material must be loaded in the form of agglomerate. Claim 1: A method for processing sulphide iron-containing materials, which includes loading the material into a furnace together with a silicon compound, melting to form an iron silicate melt in suspension by burning sulphide-bound oxygen-containing gas, about a lt and h so that, in order to feed untreated iron and sulfur dioxide at low energy costs, the formation of the iron silicate melt is carried out until it contains 7 O 90% PeO by weight, after which it is reduced to a content of 6.0% FeO by introducing a reducing and fluxing reagent, then the formed iron is separated from the iron silicate melt and an iron oxide material is added to the melting zone.
    [2]
    2. A method according to claim 1, characterized in that aprit slags are used as the iron oxide material.
    [3]
    3. The method according to claim 1, characterized in that iron ore concentrates are used as the iron oxide material.
    [4]
    4. The method according to claim 1, wherein the process is carried out in mutually separated furnaces for melting and recovery.
    [5]
    5. Method for .h, 1, (o.tl.and. And s.I; the fact that the reducing. And oxygen-containing gases are injected through a lance or tuyeres. Sources of information taken into account during the examination 1.US Patent No. 379О336, к. 432163, 1975. 2. Gudima I.V. / (and others. A brief guide to the metallurgy of known metals. M., metallurgi, 1975, pp. 117118, 122.
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    同族专利:
    公开号 | 公开日
    WO1979000058A1|1979-02-08|
    SE7708462L|1979-01-23|
    PT68311A|1978-08-01|
    JPS5423014A|1979-02-21|
    CA1112456A|1981-11-17|
    IT1099010B|1985-09-18|
    US4304595A|1981-12-08|
    ES471835A1|1979-02-01|
    GR65240B|1980-07-30|
    IT7825973D0|1978-07-21|
    SE406929B|1979-03-05|
    引用文献:
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    US3615362A|1969-02-14|1971-10-26|Int Nickel Co|Slagging in top blown converters|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE7708462A|SE406929B|1977-07-22|1977-07-22|PROCEDURE FOR THE MANUFACTURE OF IRON SULFID-CONTAINING RAILS|
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