• 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 for the production of ferromanganese from iron-containing manganese ores, in which the reduction of the ore, which is mixed with coal and slag-forming constituents, is conducted in a rotary kiln at 1200 DEG to 1350 DEG C. in the presence of a CO-containing atmosphere for 20 to 240 minutes, and in which melting follows in a melting furnace at 1400 DEG to 1600 DEG C. By this process, the greatest part of the gangue of manganese ore can be separated off before melting the reduced ore.
    公开号:SU1225495A3
    申请号:SU843830909
    申请日:1984-12-21
    公开日:1986-04-15
    发明作者:Дер Херманн；Хостер Томас；Нойшуц Дитер；Янсен Вильхельм；Радке Дитрих；Ульрих Клаус
    申请人:Фрид.Крупп Гмбх (Фирма)；
    IPC主号:
    专利说明:

    2. Method POP1, characterized in that the mixture of manganese, coal and slag-forming additives is heated in a rotary kiln for 20-120 minutes to 1250-1330 ° C, the melting of the alloying fraction is carried out at 1450-1550 ° C.
    3. Method POPP.1 and 2, characterized in that in a mixture consisting of manganese PASCHYA, coal and slag-forming additives, manganese ore has a particle size less than
    5 mm, coal - less than 15 mm, slag-forming additives - less than 5 mm
    4. A method according to Claims 1 to 3, characterized in that SiOj is added to the mixture of manganese, coal and slag-forming additives in a rotary kiln only when the temperature of the mixture reaches more.
    5. A method according to claims 1-4, characterized in that each metal containing slag-rich fraction is crushed to obtain a particle size of less than 5 mm, the metal-lean cshak and the doping fraction transported into the smelting furnace are separated by density.
    6. The method according to claims 1-5, about tl and the fact that the metal-depleted slag fraction is crushed to obtain particles less than 0.5 mm in size, by separation in density and / and-pi electrostatic separation is divided into slag ,. and the doping fraction transported to the smelting furnace,
    7. The method according to claims 1-6, about tl and which is due to the fact that a part of the alloying fraction with a particle size of less than 1 mm is blown into the melt in the smelting furnace.
    8. The method according to claims 1-7, o, tl and the fact that a part of the alloying fraction with a particle size of less than 1 mm, as well as coal with a particle size of less than 1 mm, is suspended in the carrier gas and through a nozzle located in melting furnace under the surface of a metal bath, vduvag:
    In the melt, simultaneously through the nozzle, attached to this. Soplu, oxygen is fed into the melt.
    9. A method according to claims 1 to 8, characterized in that through the outer tube of a nozzle with a jacket located in a melting furnace under the surface of a metal bath, a suspension of alloying fraction, coal, carrier gas is blown into the inner tube of the nozzle with jacket oxygen is blown into the melt.
    10. The method according to claims 1-9, about tl and - h a.yu u and with the fact that for each
    kilograms1-1m of the alloying fraction introduced into the smelting furnace, 0.4-0.8 kg of coal and stoichiometric amount of oxygen for the coal mass are blown into the melt under the surface of the metal bath,
    11. The method according to claims 1-10, about tl and the fact that at least a part of the off-gas of the smelting furnace is used as the carrier gas,
    12. The method according to claims 1-11, about tl and -. That the heat of the waste gas of the smelting furnace is used for semi-coking of coal, which is then blown into the melt under the surface of the metal bath,
    13. Method according to claims, 1-12, about tl and - h and y w; and with the fact that in the rotary kiln the flue furnace melt furnace, not used as a carrier gas, and coke oven gas produced during coal-carbon-coking are burned,
    14. The method according to PP, 1-13, tl and - chayuts; 1, the fact that the exhaust gas of the rotary kiln burns out and the heat of the burned exhaust gas is used at least partially to preheat manganese ore and slag-forming additives.
    15. The method according to claims 1-14, about tl and - due to the fact that the melt is periodically oxidized and desulfurized by blowing oxygen and feeding CaO and / or CaCj,
    16. The method according to claims 1 to 15, about tl and the fact that the molten slag formed in the melting furnace is cooled, crushed and mixed with metal containing bogatiy slag fractions.
    ten
    The invention relates to the field of ferrous metallurgy, in particular, to a method for producing a ferromanganese carbon content of 0.05-8% from manganese ore containing iron by heating a mixture consisting of manganese ore, solid fuel containing carbon and slag-forming additives, in a rotary kiln and the subsequent melting of the ferromanganese from the reaction product, which is discharged from the kiln and cooled.
    The purpose of the invention is to save energy consumption.
    The goal is achieved by the fact that according to the method of producing a ferromanganese with a carbon content of 0.05-8 wt.% From iron-containing manganese ore by heating a mixture consisting of manganese ore, solid fuel containing carbon and slag-forming additives, rotary kiln and subsequent smelting of ferromanganese from the reaction product unloaded from the rotary kiln and 25 cooled, a mixture of margarts, coal and pshakoobrazuyuschy additives, in which the ratio of ore and coal 1: 0.4 - 1: 2, and the amount of slag-forming additives CaO and / or Mg O, as well as, and / or 30 SiOj is such that the ratio in the slag (CaO-fMgO) and () 1: 3 - 1: 4 and the ratio A1,, 0, and SiOj 1: 3 - 1: 9, is heated in rotary kiln for 20–240 minutes in an atmosphere containing 35 CO, up to 1200–1350 ° C, the reaction product discharged from the rotary kiln is crushed to obtain particles less than 15 mm in size, the ground reaction product is divided by 40 density classified into a carbonaceous fraction, directed back to the rotary kiln, at least a metal containing slag-rich fraction and an alloying fraction 45 transported in the melt The molten furnace, melting of the alloying fraction is conducted in a melting furnace at 1400-1600 C.
    According to the invention in a rotary kiln, which can be performed in the form of a rotary tube furnace or in the form of a rotary drum kiln, the degree of reduction of manganese and iron reaches 90-98%. This leads to the fact that a mixture of 55 ore, coal and slag-forming additives in the recovery process goes into a pasty state, and


    agglomeration of individual particles occurs and the formation of small metal droplets. However, in the rolling process in the rotary kiln, the granular structure of the injected mixture is maintained. No noticeable re-oxidation of the metal particles occurs, as the metal droplets included in the reduced material have a small surface and do not retain the original ore structure, as in the known methods. When reduced, manganese carbides are almost not formed, but ferromanganese is produced. The melting of the material obtained in the rotary kiln is carried out in a suitable melting kiln after cooling and separating the coal residues and most of the gangue. Due to the indicated ratio of ore and coal in the mixture consisting of manganese, coal and spack-forming additives, an optimal reduction process is achieved in the rotary kiln, and an optimal melting process is achieved in the melting furnace. With the indicated ratios of (CaO + MgO) and (, and AljO) SiO2, the slag-and-fusion mixture in a rotary kiln turns into a pasty state especially quickly. When determining the amount of slag-forming additives, it is necessary to take into account the content of CaO, MgO, and SL02 in manganese ore and coal ash. By grinding the reaction product obtained in a rotary kiln and dividing it in density, it becomes possible to enrich the ferromanganese before melting, while separating coal and a significant portion of the core rock, the alloying alloy formed during the enrichment has a very high metal content.
    It is advisable if the mixture of manganese, coal and slag-forming additives is heated in a rotary kiln for 20-120 minutes to 1250-1330 0, and the melting of the alloying fraction is carried out at 1450-1550 ° C.
    In a mixture of manganese, coal, and pshakoobrazuyuschih additives, manganese ore had a particle size of less than 5 mm, coal - less than 15 mm, and slag-forming additives - less than 5 mm. With such a granulometric composition of the raw mix, it is not necessary to granulate it before being introduced into the rotary kiln, since if the indicated particle sizes are observed, the reduction process in the rotary kiln proceeds without complications. The invention does not preclude the use of granulated or pelleted raw materials in a rotary kiln.
    Si0.j is added to the mixture of manganese, coal and slag-forming additives in a rotary kiln when the temperature of the mixture reaches more than 900 C.
    This eliminates the formation of low-melting slag compositions of FeO, MpO and SiO.
    Each metal-containing slag-rich fraction is crushed into particles less than 5 mm in size by separating the metal-slag slag and alloying fractions by density, the latter is transported to a smelting furnace. This increases the yield of the obtained ferromanganese.
    The metal depleted slag fraction is crushed into particles less than 0.5 mm in size, separated by density and / or electrostatic separation, is separated into a slag and alloying fraction transported to a smelting furnace, which further enhances the yield of the produced ferromanganese. I
    , Density separation is produced predominantly by gaseous, dry separation media, since when using an aqueous separation medium, rtoBTopHoe oxidation of the metal could occur. Density separation can also be carried out when using non-oxidizing liquid, such as oil or an organic solvent, as a liquid separation heart.
    A part of the alloying fraction with a particle size of less than 1 mm is blown into the melt, being found in a melting furnace. This operation can be performed from above or below the surface of the bath of molten metal. Injection of parts of the alloying fraction into the melt allows achieving a uniform process of melting. A portion of the ligation fraction with a particle size of more than 1 mm is loaded into the smelting furnace from above.
    Preferably, if part of the alloying fraction with a particle size less than 1 NfM, as well as coal with a size
    particles less than 1 mm are suspended in a carrier gas and are blown into the melt by means of a nozzle located in a melting furnace under the surface of a metal bath, while oxygen is supplied through a nozzle connected to this nozzle into the melt. By co-blowing these substances, a uniform melting process is achieved with optimal mixing of the melt and Eshak,
    A suspension of the alloying fraction, coal and carrier gas is blown through the outer tube of a nozzle with a jacket located under the surface of the metal bath in the melting furnace, and oxygen is blown into the melt through the inner tube of the nozzle with the jacket. Each kilogram of the alloying fraction introduced into the melting furnace 0.4 to 0.8 kg of coal and a stoichiometric amount of oxygen for the coal mass (to obtain CO) under the surface of the metal bath are blown into the melt. With this ratio, a sufficient heat of fusion is created in the melting furnace, and in the melt there is no too high carbon content,

    At least a portion of the off-gas of the melting furnace is used as a carrier gas for a portion of the alloying fraction, as well as for fine coal, which is blown into the melt. However, other inert gases can also be used as carrier gas, in particular, az-ot7
    The heat of the flue gas from the melting furnace I is spent to heat the coke of coal, which is then blown into the melt under the surface of the metal bath. In semi-coking, the volatile components contained in the coal are removed, thereby forming char. In comparison with coal, semi-coke has a higher content of used heat, which favorably affects the melting process.
    For the energy balance of the process, it is especially effective when the off-gas of a smelting furnace not used as a carrier gas and the coke oven gas produced during coal semi-coking is burned in a rotary furnace.
    The rotary kiln exhaust gas is also effective, afterburning, and the heat of the burned exhaust gas is used at least partially to preheat the manganese ore and slag-forming additives. Recovery time does not include preheating time.
    The melt is periodically desulfurized 10 and is oxidized by blowing oxygen and introducing CaO and / or CaC. Oxidation and sulfur removal can be carried out in a smelting furnace or in an additionally connected second smelting unit. CaO or CaC can be suspended in a stream of nitrogen, which through the inner pipe of the nozzle with the jacket is fed into the melt. By oxidizing and removing sulfur, the carbon content can be reduced to 0.05%, and the sulfur content to 0.03%. During oxidation, the temperature of the melt increases, with above 1600 C.
    The molten slag formed in a smelting furnace for 25 seconds is cooled, crushed and mixed with metal and slag containing fractions. Due to this, the regeneration of metal clocks of 30 tei, which are present in the molten slag, is largely achieved.
    The drawing shows the technological scheme of the method, g
    Manganese-5 ore containing iron or a mixture of iron or manganese ore with a particle size of less than 5 mm is transported from a spare bunker 1 through conduit 2 to a counter-heat exchanger 3. From slave bunker A, slag-forming additives are transported through pipeline 5 CaO, MgO and AljOj with a particle size of less than 5 mm in a countercurrent heat exchanger 3. A mixture of ore and slag-forming additives is preheated in a countercurrent heat exchanger up to 800 C. A countercurrent heat exchanger 3 is supplied with hot exhaust gas, which through the conduit 6. The cooled flue gases 50 is withdrawn via line 7 from the exchanger proti- votochnogo after dedusting and - the atmosphere. The preheated raw material enters the rotary tubular furnace 8 via pipeline 55. In addition, the rotary tubular furnace from the spare bunker 10 is supplied via pipeline 11.
    coal with a particle size of 15 minutes min.
    The rotary tubular furnace 8 is heated by burning fine-grained coal, which is fed from the spare bin 12 through conduit 13 to the burner 14 and from there via conduit 15 to the rotary tubular furnace. The heating of the growing tube furnace is carried out in countercurrent to the preheated coal and coal. However, heating can also be carried out directly, as shown in the drawing. In the rotary tube furnace inside the reduction zone, the temperature is predominantly 1250-1330 0, the raw mixture under the conditions of reduction takes a pasty state, the formation of small metal droplets and agglomeration of many particles of the recovered material. In a rotary tubular furnace, the separation of the metal sheath and the gangue rock has not yet occurred, and the pasty state of the recovered material does not result in adherence to the lining of the rotary tubular furnace. The sticking can be prevented, in particular, by the fact that the rotary tubular furnace is equipped with a magnesite lining, which contains additives of chromium oxide and / or coal and / or resin. In the zone of rotation of the tubular furnace, in which the reduced material has a temperature of more than 900 ° C, SiOj, which is necessary for the formation of slag, with a particle size of less than 5 mm, is introduced through the pipeline 16 from the spare bunker 17. The rotary tube furnace 8, taking into account the SiOj content of the coal, from the spare bunker 17 serves such an amount Sic, which is necessary to obtain a pasty state. Pipeline 18 into the combustion chamber 19 is fed exhaust gas from a rotary tube furnace containing CO, where it is then burned.
    The paged rotary kiln material is discharged through conduit 20 to cooling drum 21 where it is cooled. The cooled discharged material enters through conduit 22 to crusher 23, where it is ground to obtain particles smaller than 15 mm. The crushed material through the pipeline 24 is fed to
    the air concentration table 25, where the separation into the carbon-containing fraction, the metal-containing slag-rich fraction and the metal-rich doping fraction occurs, the coal-containing fraction through the pipeline 26 enters the rotary tube furnace 8, and the metal-rich fraction through the pipelines 27 and 28 enters the reserve tank 29.
    The metal-containing slag-rich fraction is transported through conduit 30 to mill 31, where grinding takes place to produce particles less than 5 mm in size. The crushed material enters via conduit 32 to air concentration table 33, where the mixture is divided into doping and metal-depleted slag fraction in accordance with different densities. The doping fraction is fed through conduit 34 and 28 to the storage bin 29, and the metal-depleted slag fraction is transported via conduit 35 to mill 36, where it is milled to obtain 0.5 mm particles. The crushed metal-depleted slag fraction through conduit 37 enters an air concentration table 38, where separation into doping and slag fractions takes place. The alloying fraction is transported via pipelines 39 and 28 to reserve hopper 29, and the slag fraction with very little metal content is withdrawn through pipeline 40 and stored.
    Separate metal-containing alloying fractions are mixed in the storage bin 29 and through a pipeline, 41 is fed to a vibrating screen 42, where the fraction of grains with a particle size of less than 1 mm is separated. The fraction of grains with a particle size of less than 1 mm through the duct 43 through the exhaust umbrella 44 is introduced into the melting furnace 45. The fraction of grains with a particle size of less than 1 mm is fed into the melting furnace 45 through conduit 46 and the outer nozzle pipe 47 with a jacket. In the smelting chamber there is a melt consisting of a ferromanganese which is discharged with parts from a melting furnace through an outlet 48 at certain intervals. The spac is periodically removed.
    5 C
    five
    0
    0
    ,
    five
    0
    from the melting furnace through the discharge device 49. Liquid slag is transported into the cooling chamber 50, cooling, ayut, granulate through pipeline 51 is fed to the mill.
    The melt furnace off-gas that has accumulated in exhaust hood 44 is partially used as carrier gas and through conduit 52, 53 and 46, as well as the outer pipe 47 of the jacketed nozzle back into the melt. Through the inner pipe 54 of the nozzle with the jacket from the reserve tank 55 through the pipeline 56, oxygen is blown into the melt, and CaO in the reserve vessel 58 with a particle size of less than 1 mm can be fed into the stream from the pipe 57.
    Exhaust gas from the smelting furnace enters through the pipe 59 into the semi-coking device 60, to which coal from the spare bunker 12 is fed through the pipe 61 with a particle diameter less than 1 mm. The coke oven gas and waste gas from the smelting furnace is removed from the semi-coking unit 60 through line 62 and then burned in a burner 14, the char from the semi-coking unit 60 is transported through conduit 63 to a spare bunker 64 and stored there. From there, the char is suspended in a gas carrier and pipelines 53 and 46 together with the alloying fraction are blown into the molten metal.
    Example. To obtain a ferromanganese, an iron-containing manganese ore of composition is used,%: Mn 43; Fe 6.2; MgO 2; 2; SiO 4.9; , 85; CaO 10.7; WITH 10.3%. The ore is ground to a particle size of less than 2 mm. Anhydrous coal used for reduction has the following composition,%: ash 18.1; carbon 73.6; hydrogen 3.2; nitrogen 1,5. The coal is ground to obtain particles with a size of less than 15 mm. Coal ash has the following composition,%: 52; - 30; CaO 5 and MgO 2. 350 kg of crushed ore and 350 kg of powdered coal are loaded into a rotary drum furnace; the ratio of ore and coal is 1: 1.
    The drum furnace has a lining of chromium-magnesite and is preheated to 1400 ° C before loading the mixture of ore and coal,
    For heating the furnace, an oxygen burner is used, which is fed every minute with 4 kg of fine coal and 3N. Additionally, air is introduced into the furnace, so that the exhaust gas of the rotary drum furnace contains 25 vol%, COj and 12 vol% CO. The mixture of ore and coal is held in a rotary drum furnace for 60 minutes at 130t ° C. In this case, due to the composition of the ore and coal, it is not necessary to introduce slag-forming additives into the rotary drum furnace. The material of the rotary drum furnace is discharged into the cooling drum and is rapidly cooled to less than by interfering in water. Unloaded material contains 30% of particles with a size of less than 20 mm and 60% of particles with a size of less than 10 mm. Visible spherical metal particles firmly entered the unloaded material. The material is then crushed to obtain particles of 10 mm in size and, by dry separation by density, on an air concentration table is divided into metal containing (60%) and carbon containing (40%) fractions. The metal fraction is ground to a particle size of less than 2 mm. The crushed metal-containing fraction is approximately n; 1/3 of the particles with a size of less than 0.3 mm and contains a metal of about 80%. This fine-grained part of the metal-containing fraction is separated into a metal-depleted slag fraction and a metal-rich doping fraction by dry density separation. The metal-rich alloying fraction consists of 90% of ferromanganese alloy and up to 10% of slag. The metal-depleted slag fraction contains the remainder of the ferromanganese, which must be separated. From the slag fraction with a particle size of 0.3-2 mm after grinding to obtain a part of less than 0.3 mm in size, a part that is rich in metal is separated by electrostatic separation, which is then mixed with a metal-rich doping fraction. The loss of 1.1 manganese resulting from the manganese content in the metal-depleted slag obtained during the separation process at DENSITY reaches approximately 7%. The alloying fraction is melted in a melting leu with a capacity of 3 tons, of which 1200 kg of metal, the temperature of which reaches approximately. Through the external pipes of three nozzles with a jacket located at the base of the smelting furnace, every minute I blow 8 kg of fine coal into the melt. Through the inner pipes of three nozzles with a jacket, 6 N oxygen is fed into the melt. In the molten metal, a carbon content of 3-6% is established. The fine-grained part of the alloying fraction, God-tight metal, with a particle size of less than 0.5 mm, is blown into the melt along with the coal, the remaining metal-rich alloying fraction is loaded into the smelting furnace through a hood and the slag has a ratio (CaO-fMgO) and (Si02 + + Al, j, 0,) 1: 1.9 and the ratio of A1 0 and SiOj 1: 2.2. At the melting point of the ferromanganese, the slag is in a liquid state and after they are melted, 000 kg of metal are released. I
    After removing the slag from the furnace, the coal is reduced to 4 kg / min in the melt, and the bath temperature of the molten metal increases to 1750 C. The carbon content in the melt decreases by about 2%. Then, through the inner tubes of three jacketed nozzles, every minute, 8 kg of CaO suspended in nitrogen are blown into the melt. As a result, the sulfur content in the melt is reduced to values less than 0.03%. The metal taken from the plate furnace contains 82% manganese, 12% iron and 2% carbon.
    8 kg / min of fine coal is blown into the waste gas of the melting furnace. The exhaust gas is cooled to 600-700 ° C and the volatile components of the coal are removed. The gas mixture, consisting of coke oven gas and cooled melted gas from the smelting furnace, is burned. The semi-coke obtained in the semi-coking coal is ground and, through the outer pipe of the three nozzles with the jacket, is blown into the Separating furnace.
    The yield of iron and manganese is about 90%.
    When separating by density a mixture of solid particles of various densities with a fine fraction of grains, the mixture is suspended in a liquid
    or a gas stream, particles of the same density with different electrical conductivity in approximately the same place fall out of this suspension to the electrostatic separation of particles. When separated by force of the electric field.
    权利要求:
    Claims (16)
    [1]
    1. METHOD FOR PRODUCING FERROMARGANESE with a carbon content of 0.05-8 wt. X from ° iron-containing manganese ore by heating a mixture consisting of manganese ore, solid fuel containing carbon, and pshakobrazuyuschih additives, in a rotary kiln and subsequent smelting of ferromanganese from the reaction product , unloaded from a rotary kiln and cooled, characterized in that, in order to save energy, a mixture of manganese, coal and slag-forming additives, in which the ratio of ore and coal is 1: 0.4-1: 2, and the amount of slag-forming additives is CaO H / nnHMgO, A1 2 O 3 and / or SiO 2 is such that the ratio in the slag (CaO + MgO) and (Al 2 O } + SiO 2 ) 1: 0.3-1: 4 and the ratio A1 2 0 > IB10 1 from 1: 0.3 to 1: 9, heated in a rotary kiln for 20-240 min in an atmosphere containing CO, to 1200-1350 ° С, the reaction product unloaded from the rotary kiln is crushed to obtain particles smaller than 15 mm, crushed the reaction product is classified by density separation into a carbon-containing fraction sent back to the rotary kiln, at least a metal-containing fraction rich in slag, and an alloying fraction transported to the smelter The first furnace, the alloying fraction is melted in a melting furnace at 1400-1600 ° C.
    ^ Eeyore "1225495
    [2]
    2. The method according to claim 1, characterized in that the mixture of manganese, coal and slag-forming additives is heated in a rotary kiln for 20-120 minutes to 1250-1330 ° C, the alloying fraction is melted at 1450-1550 ° C.
    [3]
    3. The method according to claims 1 and 2, characterized in that in the mixture consisting of manganese ore, coal and slag-forming additives, manganese ore has a particle size less than
    5 mm, coal - less than 15 mm, slag-forming additives - less than 5 mm.
    [4]
    4. The method according to claims 1 to 3, characterized in that SiO 2 is added to a mixture of manganese, coal and slag-forming additives in a rotary kiln only when the temperature is. The mixture temperature reaches more than 900 ° С.
    [5]
    5. The method according to claims 1 to 4, characterized in that each metal-containing slag-rich fraction is crushed to obtain a particle size of less than 5 mm, and the metal-depleted slag and doping fractions transported into the melting furnace are separated by density.
    [6]
    6. The method according to claims 1-5, characterized in that the metal-depleted slag fraction is crushed to obtain particles less than 0.5 mm in size, separated by density and / or electrostatic separation into slag and transported to the smelter furnace alloy fraction.
    [7]
    7. The method according to claims 1-6, which is characterized in that a part of the alloying fraction with a particle size of less than 1 mm is blown into the melt in the melting furnace.
    [8]
    8. The method according to claims 1-7, o, t l and the fact that part of the alloying fraction with a particle size of less than 1 mm, as well as coal with a particle size of less than 1 mm, are suspended in a carrier gas and through a nozzle located in the melting Ovens under the surface of a metal bath are blown into the melt, simultaneously through the nozzle attached to this nozzle, oxygen is supplied to the melt.
    [9]
    9. The method according to claims 1 to 8, characterized in that through the outer pipe of the nozzle with the jacket located in the melting furnace under the surface of the metal bath, a suspension of the alloying fraction, coal, carrier gas is blown into the melt, and through the inner tube of the jacketed nozzle is blown into the melt with oxygen.
    [10]
    10. The method according to claims 1 to 9, which is characterized in that for every kilogram of the alloying fraction introduced into the smelting furnace, 0.4-0.8 kg of coal and a stoichiometric amount of oxygen are injected into the melt under the surface of the metal bath for coal mass.
    [11]
    11. The method according to claims 1 to 10, wherein the method comprises at least a portion of the exhaust gas of the melting furnace as a carrier gas,
    [12]
    12. The method according to claims 1-11, wherein the heat of the exhaust gas of the melting furnace is used for semi-coking of coal, which is then blown into the melt under the surface of the metal bath.
    [13]
    13. The method according to claims 1-12, wherein the rotary kiln burns off-gas from the smelter, which is not used as a carrier gas, and coke oven gas obtained by semi-coking coal.
    I
    [14]
    14. The method according to claims 1 to 13, wherein the exhaust gas of the rotary kiln is burned and the heat of the burned exhaust gas is used at least partially for preheating manganese ore and slag-forming additives.
    [15]
    15. The method according to claims 1-14, wherein the melt is periodically oxidized and desulfurized by blowing oxygen and supplying CaO and / or CaC 2 .
    [16]
    16. The method according to claims 1-15, wherein the molten slag formed in the melting furnace is cooled, crushed and mixed with metal-containing slag-rich fractions.
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    同族专利:
    公开号 | 公开日
    JPS60169543A|1985-09-03|
    JPH0429732B2|1992-05-19|
    ZA8410102B|1985-09-25|
    US4576638A|1986-03-18|
    NO163061C|1990-03-28|
    DE3347685C1|1985-04-04|
    NO845071L|1985-07-01|
    NO163061B|1989-12-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    法律状态:
    优先权:
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