WO2023026459A1 - Four de fusion et son procédé de fonctionnement - Google Patents

Four de fusion et son procédé de fonctionnement Download PDF

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Publication number
WO2023026459A1
WO2023026459A1 PCT/JP2021/031471 JP2021031471W WO2023026459A1 WO 2023026459 A1 WO2023026459 A1 WO 2023026459A1 JP 2021031471 W JP2021031471 W JP 2021031471W WO 2023026459 A1 WO2023026459 A1 WO 2023026459A1
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reaction zone
molten metal
matte
charge
smelting furnace
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PCT/JP2021/031471
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English (en)
Japanese (ja)
Inventor
本村竜也
神野洋平
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Ｊｘ金属株式会社
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Priority to CN202180101871.0A priority Critical patent/CN117881802A/zh
Priority to JP2022540929A priority patent/JP7257594B1/ja
Priority to PCT/JP2021/031471 priority patent/WO2023026459A1/fr
Priority to JP2023014698A priority patent/JP2023058552A/ja
Publication of WO2023026459A1 publication Critical patent/WO2023026459A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B15/00—Obtaining copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a smelting furnace and its operating method.
  • flash smelting furnaces see, for example, Patent Document 1
  • bottom-blowing furnaces see, for example, Non-Patent Document 1
  • the flash smelting furnace uses a solid-gas reaction, it has the advantages of high reaction speed and high reaction efficiency, and a larger raw material throughput per unit volume of the furnace than other processes.
  • the flash smelting furnace also has the drawback that the physical properties, shape, size, moisture content, etc. of the raw materials are restricted due to the solid-gas reaction.
  • bath smelting like a bottom-blowing furnace utilizes a solid-liquid reaction or a gas-liquid reaction
  • there are few restrictions on the shape, size, moisture content, etc. of the raw material and it has the advantage of being able to process raw materials with high impurity concentrations. be.
  • bath smearing also has drawbacks such as the generation of splashes and a low reaction rate.
  • Splash means that the gas blown into the molten metal and the gas generated by the reaction float in the molten metal and when it escapes from the surface of the molten metal to the gas phase, the bubbles of the molten metal that cover the gas burst and the splashes of the molten metal become the gas phase. It means a phenomenon in which droplets of molten metal are scattered into the gas phase from a cavity generated by gas blown from the gas phase toward the molten metal.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a smelting furnace and a method of operating the same that have the advantages of both the flash smelting furnace and the bath smelting, and can compensate for the disadvantages of both.
  • a first charge containing a powdery concentrate is charged, and the concentrate is oxidized with an oxygen-containing gas and dropped downward in the form of droplets in a first reaction.
  • a zone and a holding vessel for holding the molten metal obtained by dropping the droplets, and a raw material other than the concentrate is charged to the molten metal as a second charge to oxidize the matte in the molten metal.
  • the smelting furnace has a holding vessel that is positioned below the first reaction zone and holds the molten metal, and grades the matte by oxidizing the matte by blowing an oxygen-containing gas into the matte in the molten metal.
  • the third reaction zone may adjust the concentration of impurities in the matte by oxidizing the matte by blowing an oxygen-containing gas into the matte in the molten metal.
  • the moisture content of the second charge may be higher than the moisture content of the first charge.
  • the average particle size of the second charge may be 500 ⁇ m or more.
  • the total amount of moisture with respect to the total amount of the first charge and the second charge may be 3 mass% or less.
  • the oxygen-containing gas may be supplied from a lance to the molten metal in the second reaction zone.
  • the second charge charged into the second reaction zone may be obtained by processing the molten metal extracted from the extraction port of the holding vessel. good.
  • Another smelting furnace includes a first reaction zone in which a powdery concentrate is oxidized with an oxygen-containing gas and dropped downward in the form of droplets, and a molten metal obtained by the dropping of the droplets. and a third reaction zone that has a holding container for holding the matte and adjusts the grade of the matte by oxidizing the matte contained in the molten metal by blowing an oxygen-containing gas into the molten metal. .
  • the third reaction zone may adjust the concentration of impurities in the matte by oxidizing the matte by blowing an oxygen-containing gas into the matte in the molten metal.
  • a method of operating a smelting furnace comprises: in a first reaction zone, the concentrate in a first charge containing a powdery concentrate is oxidized with an oxygen-containing gas to form liquid droplets. and charging a raw material other than the concentrate as a second charge into the molten metal in a second reaction zone having a holding container for holding the molten metal obtained by dropping the droplets, and the matte in the molten metal The second charge is melted by the heat of oxidation or the combustion flame of the fuel and passed below the first reaction zone.
  • the matte in the molten metal is blown with an oxygen-containing gas to may adjust the quality of the matte by oxidizing the
  • the concentration of impurities in the matte may be adjusted by oxidizing the matte by blowing an oxygen-containing gas into the matte in the molten metal.
  • the moisture content of the second charge may be higher than the moisture content of the first charge.
  • the average particle size of the second charge may be 500 ⁇ m or more.
  • the total amount of moisture with respect to the total amount of the first charge and the second charge may be 3 mass% or less.
  • the oxygen-containing gas may be supplied from a lance to the molten metal in the second reaction zone.
  • the molten metal extracted from the extraction port of the holding vessel may be treated and used as the second charge.
  • Another method of operating a smelting furnace according to the present invention is characterized in that, in a first reaction zone, the concentrate in a charge containing the powdery concentrate is oxidized with an oxygen-containing gas to form droplets. and oxidizing the matte contained in the molten metal by blowing an oxygen-containing gas into the molten metal in a third reaction zone having a holding container for holding the molten metal obtained by dropping the droplets, thereby oxidizing the matte characterized by adjusting the quality of
  • the impurity concentration in the matte may be adjusted by oxidizing the matte contained in the molten metal by blowing an oxygen-containing gas into the molten metal in the third reaction zone.
  • a smelting furnace and its operating method that have the advantages of both a flash smelting furnace and a bottom-blowing furnace and can compensate for the drawbacks of both.
  • FIG. 1 is a schematic diagram of a flash smelting furnace; FIG. (a) and (b) are diagrams illustrating the operation of a flash smelting furnace. (a) and (b) are schematic diagrams of a bottom blowing furnace.
  • 1 is a perspective view of a smelting furnace according to an embodiment; FIG. 1 is a side view of a smelting furnace; FIG. It is a figure which illustrates the flow around a smelting furnace.
  • FIG. 1 is a schematic diagram of a flash smelting furnace 200.
  • the flash smelting furnace 200 has a structure in which a shaft portion 201, a settling portion 202, and an uptake portion 203 are arranged in order.
  • a concentrate burner 204 is provided on the upper portion of the shaft portion 201 .
  • FIGS. 2(a) and 2(b) are diagrams illustrating the operation of the flash furnace 200.
  • FIG. 1 powdery solid raw materials such as copper concentrate and solvent are charged into the shaft portion 201 from the concentrate burner 204, and the oxygen-containing gas is refined. It is blown into the shaft portion 201 from the ore burner 204 .
  • the copper concentrate undergoes an oxidation reaction and drops as a droplet shower to become molten metal.
  • the molten metal separates into a mat 205 and a slag 206 at the bottom of the shaft portion 201, as illustrated in FIG. 2(b).
  • Air or oxygen-enriched air can be used as the oxygen-containing gas.
  • Oxygen-enriched air is air that has a higher concentration of oxygen than the natural atmosphere.
  • the mat 205 is introduced into the converter from the extraction port through a gutter, a container for holding molten metal, and the like.
  • the slag 206 is introduced into the smelting furnace through a gutter or the like from the withdrawal port.
  • a solid-gas reaction occurs in which the dried powdery solid raw material reacts with the oxygen-containing gas. Because the powdery solid raw material with a large surface area and the oxygen-containing gas are supplied into the smelting furnace under the condition that they are rapidly mixed through a concentrate burner or the like, and the powdery solid raw material and the oxygen-containing gas come into instant and easy contact. , the solid-powder raw material is instantaneously oxidized in this solid-gas reaction. In addition, an oxygen-containing gas is constantly supplied to the powdery solid raw material. Therefore, this solid-gas reaction has a high reaction rate and high reaction efficiency.
  • the shaft portion 201 is suitable for large-scale processing of dried powdery solid raw materials, and has the highest level of processing capacity per unit volume among smelting furnaces.
  • the slag 206 may be in a state of peroxide, and magnetite or the like may be generated, which causes an increase in copper loss.
  • FIGS. 3(a) and 3(b) are schematic diagrams of the bottom blowing furnace 300.
  • FIG. FIG. 3(a) is a cross-sectional view of the bottom blowing furnace 300 viewed from the side.
  • FIG. 3(b) is a cross-sectional view of the bottom blowing furnace 300 viewed from the end face.
  • the bottom blowing furnace 300 has a substantially cylindrical shape.
  • a charging part 301 for charging a charge is provided on the ceiling of the bottom blowing furnace 300 .
  • the matte 302 and the slag 303 are produced by oxidizing and melting the charge while entraining it in the stirred molten metal.
  • a slug 303 floats on the mat 302 .
  • a charge newly charged from the charging section 301 drops against these molten metals.
  • the bottom blowing furnace 300 gas-liquid or solid-liquid reactions occur.
  • the charged material floating on the molten metal is roasted by the reacted gas blown out from below the surface of the molten metal, and the impurities contained in the charged material volatilize before being melted. . That is, gasification and volatilization of impurities are likely to occur. Therefore, the bottom blowing furnace 300 is suitable for processing ore containing many impurities.
  • the raw material is dropped into the molten metal, it is suitable not only for processing dry powder raw materials, but also for processing undried powder raw materials and non-powder raw materials as in the flash smelting furnace.
  • the raw material that has fallen into the molten metal is caught in the molten metal and reacts due to the molten metal agitation effect of the oxygen gas for reaction blown into the molten metal, mainly the mat layer, from the lance 304 .
  • the oxygen can be effectively used for oxidizing the matte, making it easy to suppress peroxidation of the slag.
  • stirring the molten metal makes it difficult for highly viscous compounds, which are mainly made up of peroxides with a high melting point, to stabilize in the furnace. Even if the slag has poor fluidity, it can be easily discharged from the furnace by stirring the molten metal.
  • gas-liquid and solid-liquid reactions are mass transfer rate limited and contact between the reacting oxygen-containing gas and the entire melt is not instantaneous.
  • the drying of the water content in the raw materials also determines the rate of the reaction. Therefore, since these reactions have lower reaction rates and lower reaction efficiencies than the solid-gas reaction in the flash smelting furnace 200, the bottom blowing furnace 300 is not suitable for mass processing of the charged material.
  • the processing capacity of the smelting furnace is inferior to that of the flash smelting furnace.
  • the bottom blowing furnace 300 when the bubbles rising in the molten metal reach the surface of the molten metal, the film of the molten metal covering the surface of the bubbles bursts and splashes are likely to occur, and the splashes scatter in the exhaust gas passage and the waste heat recovery boiler. Then, it sticks and clogs gas passages, or adheres to boiler water tubes and reduces heat transfer efficiency. Poor discharge and production impact are major operational drawbacks.
  • the bottom blowing furnace 300 although undried raw materials can be processed, the moisture concentration in the exhaust gas rises, and the acid dew point temperature of the SO 3 gas contained in the exhaust gas rises. Equipment damage due to acid corrosion in heat recovery boilers, electrostatic precipitators, etc. is also a problem.
  • Table 1 summarizes the advantages and disadvantages of flash smelting furnaces and the advantages and disadvantages of bath smelting.
  • FIGS. 4 and 5 are diagrams illustrating the smelting furnace 100 according to the embodiment.
  • FIG. 4 is a perspective view of the smelting furnace 100.
  • FIG. FIG. 5 is a side view of the smelting furnace 100.
  • the smelting furnace 100 includes a first reaction zone 10, a second reaction zone 20, a third reaction zone 30, a settling section 40, an exhaust gas outlet passage section 50, and the like.
  • the second reaction zone 20, the third reaction zone 30, and the settling section 40 are arranged in this order. Since the settling section 40 is provided with a mat outlet and a slag outlet, the second reaction zone 20 side is the upstream side, and the settling section 40 side is the downstream side.
  • a third reaction zone 30 is located below the first reaction zone 10 .
  • the exhaust gas outlet channel portion 50 is positioned above the downstream end of the settling portion 40 .
  • the first reaction zone 10 has the same structure as the shaft portion 201 of the flash smelting furnace 200 described in FIG. Therefore, the first charge charged from the ceiling of the first reaction zone 10 is a dried powdery solid raw material with a moisture content of 1 mass% or less and an oxygen-containing gas.
  • Dried powdered solid materials include copper concentrates, solvents, recycled materials, and the like. Copper concentrates, for example, are based on CuFeS2 .
  • the solvent is, for example, siliceous ore (SiO 2 ), a substance containing SiO 2 , or the like.
  • Recycled raw materials include pulverized incinerated electronic substrates and powdered raw materials obtained by drying sludge containing valuables generated in plating factories.
  • the average particle size of the first charge is, for example, 20 ⁇ m to 50 ⁇ m.
  • a solid-gas reaction occurs in which the dried powdered solid raw material reacts with the oxygen-containing gas.
  • the copper concentrate undergoes an oxidation reaction according to the following reaction formula (1) or the like, and droplets of the reaction product fall and become molten metal.
  • the molten metal separates into matte 60 and slag 70 .
  • Cu 2 S ⁇ FeS corresponds to the main component of the mat 60
  • FeO ⁇ SiO 2 corresponds to the main component of the slag 70 .
  • the oxygen partial pressure is adjusted so that peroxidation of the slag 70 does not occur.
  • the oxygen partial pressure is adjusted so that the Cu quality of the matte 60 produced in the first reaction zone 10 is within 50 mass% to 60 mass%.
  • the second reaction zone 20 is located upstream of the third reaction zone 30 below the first reaction zone 10 and has a holding vessel that holds the molten metal produced in the first reaction zone 10 .
  • a charging section 21 for charging a charge is provided on the ceiling or side wall.
  • the second charge introduced into the second reaction zone 20 has various sizes, various shapes, and various moisture contents.
  • the charge charged into the second reaction zone 20 is raw materials other than the copper concentrate, such as secondary raw materials, matte, wrought copper slag, and repeated materials generated in the smelting process. Secondary materials are recycled materials containing precious metals, valuables and copper, and repeated materials are materials such as dust and neutralized slag generated in the smelting process. Both reactive and non-reactive raw materials can be charged.
  • the matte of the second charge is air-crushed mat obtained by air-crushing or water-granulating the mat 60 discharged from the slag cleaning furnace 110 in FIG. does not matter.
  • the wrought copper slag is air-crushed slag or water-granulated slag obtained by air-crushing the slag 70 discharged from the wrought copper furnace 120 of FIG.
  • the raw material charged into the second reaction zone is a recycled raw material that is difficult to dry to a moisture content of less than 1 mass% in a rotary kiln or the like, such as clay-like sludge containing precious metals generated in a plating factory, or the first reaction It is possible to charge undried raw materials with a moisture content exceeding 1 mass%, which is difficult to charge from the zone concentrate burner or to be conveyed by the pneumatic transportation system, and it is possible to omit the complicated drying process. For example, clay-like sludge requires drying with a special steam-type paddle dryer, etc., but it is inefficient as a drying facility despite the need for large-scale equipment, and dust is generated when dried. is the issue.
  • the water content is 1 mass% or less and the particle size is 150 ⁇ m or less.
  • a suitable drying process and crushing/grinding process are required, which requires large-scale investment.
  • the physical properties of recycled raw materials differ from collection lot to collection lot, and the cost required for pretreatment tends to increase in the future when various raw materials are processed.
  • raw materials that can be conveyed by a belt conveyor or a chain conveyor can be charged, and complicated pretreatments such as drying and pulverization are unnecessary.
  • the average diameter of the granular raw material but considering the melting time in the furnace, it is possible to process raw materials with a size of 500 ⁇ m or more. Alternatively, it is possible to process raw materials with a size of 1 mm to 20 mm. In the case of bulk raw materials, there are no particular restrictions and it is possible to process raw materials of 20 mm to 50 mm, although it depends on the capacity of the handling equipment.
  • the oxygen-containing gas is blown from the horizontal blowing lance 22 to the molten metal mat 60 held in the second reaction zone 20 .
  • the heat of oxidation of the matte 60 raises the temperature in the system of the second reaction zone 20 and melts the second charge to the second reaction zone 20 .
  • an oxygen-enriched burner, a burner using hydrocarbon, sulfur, etc. as fuel, etc. directly on the second charge floating on the molten metal.
  • the charge may be melted by the application of direct heat. For example, as exemplified in FIG.
  • a side burner 24 that emits flame inside from the side of the second reaction zone 20, and the like are provided.
  • a solid-liquid-gas reaction melting of materials occurs.
  • the mat 60 and slag 70 in the second reaction zone 20 pass below the first reaction zone 10 and move to the settling section 40 .
  • By blowing an oxygen-containing gas into the mat 60 in the second reaction zone 20 it is possible to oxidize the elements such as As, Sb, and Ni contained in the mat 60 and transfer them into the slag 70. Impurity adjustment is also possible.
  • the third reaction zone 30 is located below the first reaction zone 10 and includes a holding vessel that holds the molten metal produced in the first reaction zone 10.
  • a gas-liquid reaction takes place.
  • the oxygen-containing gas is blown from the horizontal blowing lance 31 to the molten matte 60 held in the third reaction zone 30 , and the matte 60 is oxidized.
  • the matte 60 is oxidized so that the Cu grade of the matte 60 is within 60 mass% to 70 mass%.
  • a large amount of powdery solid raw materials can be processed in the first reaction zone 10 with high reaction speed and high reaction efficiency.
  • a less constrained charge is charged to the second reaction zone 20 .
  • a charge having a higher moisture content than the charge charged to the first reaction zone 10 or a non-powder charge can be charged to the second reaction zone.
  • the charge floating on the molten metal is roasted and impurities are volatilized and removed.
  • the second reaction zone 20 is located upstream of the third reaction zone 30 below the first reaction zone 10, even if splash occurs in the second reaction zone 20, it occurs in the first reaction zone 10. The splash can be captured by a shower of molten droplets of the product.
  • the copper is heated up to the matte grade required in the entire smelting furnace 100. It is not necessary to oxidize the concentrate. Thereby, peroxidation of the slag 70 can be suppressed in the first reaction zone 10 .
  • bath smelting that supplies oxygen to the mat 60 is performed, so that overoxidation of the slag 70 can be suppressed.
  • the second charge charged into the second reaction zone 20 is melted by the oxidation reaction heat of the mat 60 .
  • the temperature of the molten metal in the system can be adjusted, and the fluidity of the molten metal can be idealized. Further, by adjusting the temperature in the system, the solidified material on the furnace wall and the furnace bottom can be melted, and the decrease in the amount of molten metal held in the furnace can be avoided. In addition, by adjusting the flow rate of the oxygen-containing gas blown into the mat in the second reaction zone, it is possible to change the state of stirring of the molten metal and melt the solidified material on the bottom of the furnace. In addition, by blowing an oxygen-containing gas into the matte layer, elements such as Ni, As, and Sb contained in the matte can be oxidized and transferred into the slag, making it possible to adjust impurities in the matte.
  • the matte 60 can be further oxidized in the third reaction zone 30 located below the first reaction zone 10 , the first reaction zone 10 can refining the copper to the desired matte grade throughout the smelting furnace 100 . The ore does not have to be oxidized. Thereby, peroxidation of the slag 70 can be suppressed in the first reaction zone 10 .
  • bath smelting that supplies oxygen to the mat 60 is performed, so that overoxidation of the slag 70 can be suppressed.
  • the third reaction zone 30 is located below the first reaction zone 10, even if a splash occurs in the third reaction zone 30, it can be captured by the molten droplet shower generated in the first reaction zone 10. can.
  • the degree of oxidation of the matte 60 in the third reaction zone 30 it is also possible to adjust the temperature in the system.
  • an oxygen-containing gas into the mat 60, elements such as Ni, As, and Sb contained in the mat 60 can be oxidized and transferred into the slag 70, and impurities in the mat 60 can be adjusted. becomes.
  • the advantages of the flash smelting furnace “high reaction speed and efficiency”, “capable of mass treatment with a single furnace”, and a bath It combines the advantages of smelting, namely, “high impurity removal capacity", “less restrictions on the amount of charge”, and “suppression of smelting slag with peroxidation”, while also having the disadvantages of a flash smelting furnace. It can compensate for certain “high load constraints”, “slag peroxide”, “peroxide coagulation” and bath smelting drawbacks of "splashing" and “slow reaction rate".
  • the acid dew point temperature is 200° C., and by operating at an exhaust gas temperature of 4% or more, it is possible to avoid troubles due to acid formation in the exhaust gas treatment system.
  • the remaining raw material charged from the second reaction zone has a water content of 18.6. % is acceptable.
  • auxiliary fuel such as coke, solid sulfur, liquid sulfur, etc. can be supplied to the first reaction zone 10 and the second reaction zone 20 to maintain the heat balance in the furnace.
  • it may be 3 mass% or more with respect to the total weight of the raw materials.
  • the entire reaction system in the smelting furnace 100 is divided into two systems: a solid-gas reaction zone (first reaction zone 10) and a gas-liquid-solid reaction zone (second reaction zone 20 and third reaction zone 30). considered balance.
  • the total charge rate of the charge into the smelting furnace was 236 Dryt/h
  • the proportion of copper concentrate in the charge was 73.1% by weight
  • the average grade of the charge was Cu: 20.9 mass%, Fe: 23.9 mass%, S: 24.4 mass%, SiO 2 : 18.5 mass%, of which the average grade of the copper concentrate is Cu: 25.4 mass%, Fe: 26.3 mass%, S: 32.7 mass%, SiO 2 : 7.9 mass% raw materials and a solvent with a SiO 2 quality of 90.0 mass% were used.
  • Other raw materials include recycled raw materials, dust generated in smelters, and neutralized materials.
  • the produced matte Cu grade is set to 57 mass%, the total amount of copper concentrate and the required solvent amount is about 90%, and the total oxygen concentration of the blast is 82% by volume.
  • the heat dissipated from the furnace body of the solid-gas reaction zone is reduced to 20% of the heat input.
  • the amount of solvent introduced into the solid-gas reaction zone was about 90% of the total amount, and the remaining 10% was introduced into the gas-liquid-solid reaction zone. If the heat dissipation ratio of the solid-gas reaction zone is maintained at about 20%, the furnace body can be maintained by cooling the furnace body while allowing the reaction to proceed continuously in the solid-gas reaction area. was used as a guideline.
  • the produced matte and slag were input in a molten state, and secondary raw materials such as wrought copper slag, slag-cleaning matte and solvent (remainder) were also input in a solid state.
  • the system was thermally balanced under conditions that produced
  • Table 2 shows the heat balance of the entire reaction system.
  • Table 3 shows the heat balance of the solid-gas reaction zone (first reaction zone 10).
  • Table 4 shows the heat balance of the gas-liquid-solid reaction zones (second reaction zone 20 and third reaction zone 30).
  • "Feed material enthalpy” in Table 4 is the sum of "Product enthalpy” and "Off gas enthalpy” in Table 3.
  • the reaction occurs in the entire reaction system and in each reaction zone, and the heat dissipation ratio is within the range that allows the furnace body to be cooled and maintained while holding the molten metal. It can be seen that the smelting furnace 100 having the two reaction zones 20 and the third reaction zone 30 can secure the amount of heat necessary for the continuous reaction.
  • the recycled raw material (secondary raw material) ratio in the raw material. For example, when an excess amount of secondary raw material is introduced into the gas-liquid-solid reaction zone, the heat required for melting is compensated for by a burner using hydrocarbon, sulfur, etc. as fuel to the gas-liquid-solid reaction zone. This results in a process that maintains the heat balance in the furnace and increases the ratio of the secondary raw material to the copper concentrate while having a high impurity removal capability.

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Abstract

Le four de fusion selon la présente invention est caractérisé en ce qu'il comprend : une première zone de réaction dans laquelle une première charge contenant un concentré sous forme de poudre est chargée, et dans laquelle le concentré est oxydé par un gaz contenant de l'oxygène et amené à tomber vers le bas sous la forme de gouttes de liquide; et une seconde zone de réaction ayant un contenant destiné à contenir le métal fondu obtenu par la chute des gouttes de liquide, la seconde zone de réaction étant telle qu'une matière première autre que le concentré est chargée en tant que seconde charge dans le métal fondu et la seconde charge est amenée à fondre par la chaleur d'oxydation d'une matte dans le métal fondu ou par une flamme de combustion de combustible, et la seconde zone de réaction étant située à un endroit qui est au-dessous de la première zone de réaction et du côté amont par rapport à la première zone de réaction par rapport à l'écoulement du métal fondu.　
PCT/JP2021/031471 2021-08-27 2021-08-27 Four de fusion et son procédé de fonctionnement WO2023026459A1 (fr)

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Application Number Priority Date Filing Date Title
CN202180101871.0A CN117881802A (zh) 2021-08-27 2021-08-27 熔炼炉及其操作方法
JP2022540929A JP7257594B1 (ja) 2021-08-27 2021-08-27 製錬炉およびその操業方法
PCT/JP2021/031471 WO2023026459A1 (fr) 2021-08-27 2021-08-27 Four de fusion et son procédé de fonctionnement
JP2023014698A JP2023058552A (ja) 2021-08-27 2023-02-02 製錬炉およびその操業方法

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JPH08504480A (ja) * 1992-10-21 1996-05-14 アールエム メタル コンサルティング ケーワイ 硫化物精鉱を処理する方法と装置
JP2004244666A (ja) * 2003-02-12 2004-09-02 Mitsui Mining & Smelting Co Ltd 金属の溶融製錬における転炉操業方法
JP2020070475A (ja) * 2018-10-31 2020-05-07 Ｊｘ金属株式会社 貴金属の回収方法

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JP2004244666A (ja) * 2003-02-12 2004-09-02 Mitsui Mining & Smelting Co Ltd 金属の溶融製錬における転炉操業方法
JP2020070475A (ja) * 2018-10-31 2020-05-07 Ｊｘ金属株式会社 貴金属の回収方法

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