WO1996008328A1 - Agent augmentant la temperature et procede d'augmentation de la temperature - Google Patents

Agent augmentant la temperature et procede d'augmentation de la temperature Download PDF

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Publication number
WO1996008328A1
WO1996008328A1 PCT/JP1994/001507 JP9401507W WO9608328A1 WO 1996008328 A1 WO1996008328 A1 WO 1996008328A1 JP 9401507 W JP9401507 W JP 9401507W WO 9608328 A1 WO9608328 A1 WO 9608328A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating
temperature
waste plastic
less
plastic
Prior art date
Application number
PCT/JP1994/001507
Other languages
English (en)
Japanese (ja)
Inventor
Masaru Takashima
Masayoshi Sakashita
Shido Ichinose
Yoshihiro Yamaguchi
Original Assignee
Aikoh Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aikoh Co., Ltd. filed Critical Aikoh Co., Ltd.
Priority to AU76245/94A priority Critical patent/AU7624594A/en
Priority to PCT/JP1994/001507 priority patent/WO1996008328A1/fr
Priority to KR1019960702459A priority patent/KR960705645A/ko
Publication of WO1996008328A1 publication Critical patent/WO1996008328A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/005—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using exothermic reaction compositions
    • 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
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]

Definitions

  • the present invention relates to the refining of metals, the preheating of containers such as electric furnaces and reverberatory furnaces, the rapid heating of molten metal, and the heating and melting of residual metal and slag solidified in furnaces and containers.
  • the present invention relates to a technique using tic as a heating material.
  • a conventional heating material and a heating method for example, when heating and raising the temperature of a molten metal vessel, a converter, a ladle, and a tundish having a large heat capacity are in a relatively low temperature range of 950 to 1,100. 1 temperature in a short time to the extent and rises goals, 2 5 0 ⁇ 1, 3 0 0 e C or more to increase the temperature, gas such as LP gas; increase, oxygen Washido Combustion with 50% 10 ⁇ 10% oxygen-enriched air Up and increase the heating time ⁇ !
  • the method power s is adopted.
  • the heating pattern of a 50-ton tundish for continuous steelmaking shows that it takes more than three hours to raise the temperature to 1,300 degrees from room temperature.
  • oxygen-enriched air is blown for 30 minutes to increase the temperature, and the atmosphere ⁇ is raised at a stroke to shorten the heating time by 40 to 60 minutes.
  • the cost required for raising the temperature becomes expensive, and further reduction in the time required for raising the temperature has been desired in terms of maintaining the operation of the tundish.
  • the molten metal container for example, the steelmaking tundish that has been poured
  • the quality is degraded due to the increase of materials and the mixture of foreign components, and in some cases, the nozzle may be closed at the start of the filling.Therefore, the steel and the steel residue remaining in the tundish are removed with a gas parner immediately after the production.
  • the tundish is melted and removed to clean the inside of the tundish.
  • a large tundish for example, in the case of a 45 ton tundish, for example, around 5 ton of solidified steel and around 1 ton of steel slag
  • problems such as the fact that much time is required to remove the residual and the cost of heating and dissolving is too high.
  • coal powder or coke powder is added for the purpose of increasing the temperature, which also serves as desulfurization treatment.
  • mixed with or without aluminum dross and enriched with oxygen or pure oxygen and blown into the melt to ⁇ $ t
  • the present invention has been made in view of such circumstances, and has as its object that the heating cost is lower than that of the conventional method, a high temperature can be obtained in a short time, and the quality of molten metal can be improved.
  • the heating material and the heating method according to the present invention include: a waste plastic having a calorie of more than 6,000 calories Zg; in particular, a heat-softening plastic such as polyethylene, polyethylene terephthalate, polypropylene, and polystyrene; After heating or softening at least one type, or mixing it with 30% by weight or less of a thermosetting plastic and molding it into a desired shape with a maximum diameter of 200 mm, heat the material, and refine the metal.
  • the present invention relates to a method of using as a temperature-raising accelerator for preheating, heating, and drying of a container, a molten metal, a solidified slag, etc., when the container is partially repaired.
  • the heat-softening waste plastic having the heat of 6,000 calories ZgiiLb is heated and softened, and then crushed or granulated to a size of 3 mm or less alone or a particle size of 1.5. mm or less of thermosetting waste plastic crushed to 30% by weight or more, or at least one kind of strong oxidizing agent etc.
  • the heating material is obtained by mixing an amount of less than 10% by weight and granulating or pulverized to a size of 3 mm or less, and a heating agent containing a knitting strong oxidizing agent.
  • Blowing force> and / or heating without passing through a lance Heating method in which the material is thrown into the object and heated rapidly, or aluminum dross is added to the above granulated or pulverized material by 10 to 70%
  • the combined temperature rise IJ is empty * 0 to 60% Oxygen mixed as a carrier gas is blown into the molten gold via a lance through a lance, and a temperature raising agent and a temperature raising method that rapidly raises the temperature and also serves as a desulfurization treatment.
  • waste plastics are recycled and used, but most of them are actually disposed of by landfill or incineration.
  • these raw plastic raw material sources are synthesized from petroleum or natural gas, and are finite as resources.Since they are simply discarded or incinerated, they are a waste of resources and how effective use is Or as a social issue.
  • the heat-softening waste plastic used in the present invention preferably has a heat of 6,000 calories Z gliLh. It is difficult to obtain the required high-temperature atmosphere in a short period of time at a temperature of 6,000 calories or less.
  • a heat-softening waste plastic equivalent to 1 6,200 calories Z g and 5 5,500 calories Z g was granulated to a diameter of 1.7 mm, respectively.
  • the time to reach 1,300 from 800 * 0 was 6,200 calories / g, which was achieved in 15 minutes. , 000 calories Zg equivalent products need more than 6,000 calories, just like 10 minutes ⁇ 22 minutes.
  • the amount of the warming agent used per hour was 900 gZ min.
  • plastic for example, heat of 150 iiLh is applied to soften and granulate with a granulator or 3 It can be liquefied at a temperature of 0 or more and granulated to 3 mm or less by the atomizing method.
  • the waste plastic can be obtained by low-temperature embrittlement and then pulverizing with a crusher.
  • the reason for limiting to granulation or pulverization with a particle size of 3 mm or less is that 3 mmliU: complete combustion is difficult and H3 ⁇ 4 easily occurs.
  • thermoset plastic that is mixed with waste thermosetting plastic crushed to a particle size of 1.5 mm or less and granulated or crushed to a size of 3 mm or less can be obtained in the same manner.
  • the plasticization was limited to the grinding of waste plastics to 1.5 mm or less. Granulation or crushing force of 3 mm or less i
  • the thermosetting plastic has a large particle size, it takes more time to decompose and gasify than the thermosoftening plastic when burning, and it does not burn in a well-balanced manner with the thermosoftening plastic.
  • the reason why the amount of the thermosetting plastic was limited to 30% or less with respect to the heat-softening waste plastic is that it is difficult to obtain the required high temperature at 30% R ⁇ due to the long heating time. It is.
  • the flammability and the burning rate are increased. And a high temperature can be obtained in a shorter time.
  • peroxides such as benzoyl peroxide, sodium peroxide, calcium peroxide, barium peroxide, strontium peroxide, magnesium peroxide, or potassium chlorate, sodium chlorate, At least one of chlorates such as barium chlorate and ammonium chlorate, or perchlorates such as ammonium perchlorate, potassium perchlorate, sodium perchlorate and potassium perchlorate, etc. You can choose.
  • the reason why the amount of the strong oxidizing agent is set to 1 to 10% is that the effect is small when the amount is less than 1%, and when the amount exceeds 10%, explosive burning power s is generated, which involves dangers and safety devices. Even if it is installed and blended by 10% or more, the temperature of Lh cannot be expected to rise.
  • strong oxidizing agents such as benzoyl peroxide need to be stabilized by adding appropriate stabilizers, for example, paraffin, stearic acid, etc. to the strong oxidizing agents to prevent explosion due to impact. It is.
  • heat-softening of 6,000 calories Z gliLh 13 ⁇ 43 ⁇ 4 plastics, after caro-thermal softening, moldings of any shape with a maximum diameter of 200 mm and heat-softening plastics A pulverized product is blended in an amount of 30% by weight or less, and a molded product of any shape having a maximum diameter of 20 O mm after heat softening can be easily obtained by extrusion molding or calo pressing.
  • the heating agent molded to a maximum diameter of 200 mm or less can be used for drying and heating preheating after a ladle for steel and a converter or a partial repair of a tundish. For example, after repair work due to melting of the converter slag line, dry and preheat to 800 "C or more with LP gas Thereafter, the formed heating agent is injected into the repaired portion, and oxygen is blown on the heating agent, so that a high temperature can be obtained in a short time.
  • the molded product having a maximum diameter of 20 Omm or less is because if it is 20 Omm or more, it does not burn efficiently and a high temperature cannot be obtained in a short time.
  • the shape of the molded product can be any shape, such as a square shape, a prism shape, a spherical shape, an almond shape, a disk shape, a column shape, etc.
  • the maximum diameter may be 200 mm or less. Absent.
  • the object to be heated which is preheated to at least 800 * 0, is because if the temperature of the object to be heated is 800 or less, it takes time to decompose the heating material and exothermic reaction, and it is difficult to heat up quickly is there.
  • the reason for limiting the oxygen content to 0-60% is that if the air content exceeds 60%, it is difficult to shorten the heating time, which may cause incomplete burning.
  • aluminum dross is composed mainly from A 1 2 0 3 that is an oxide and Kimu ⁇ A Rumi, dissolved aluminum, is generated as Bok Bbudorosu generated during Sei ⁇ .
  • the amount of aluminum dross added to the heating agent of the present invention is preferably 10 to 70%.
  • the power s heating function decreases.
  • Also included in the present invention is a method of raising the temperature of the molten steel, which is not mixed with aluminum dross in advance, but is simultaneously blown into the molten steel.
  • the waste plastic used in the present invention is specifically a heat-softening waste plastic having a heat of 6,000 cal / gi ⁇ Ut, such as polyethylene, polystyrene, polyethylene terephthalate, etc., and a calorie of 6,000 calories or more.
  • Other heat-softening plastics can be used as long as they have the following.
  • the thermosetting waste plastic is, for example, a fuanol resin, a melamine resin, or a polyurethane resin. You.
  • thermosetting 1iJ plastics containing halogen elements such as chlorine and fluorine are not preferred because they generate gas when burned.
  • the heating agent and the heating method of the present invention have been described in detail above. However, the heating agent and the heating method of the present invention should be appropriately selected depending on the object to be heated and the purpose of the heating.
  • a coke oven gas is burned with oxygen-enriched air to remove solidified steel and its slag remaining in the steelmaking dundish after use for 10 hours per hour.
  • a fire of 2,200 m: 1 is generated and can be easily removed within 15 minutes.
  • the dundish which has been in a high temperature state is cooled after 1 hour or more, and high temperature preheating is required again when reused.
  • the present invention since it can be removed in a short time, it is slightly cooled, but it can be used as it is without preheating at the time of reuse.
  • Fig. 1 shows the temperature rise curve when a heat-softening waste plastic of 6,200 calories / g and 5,000 calories Zg was put into a dandish and burned by blowing oxygen from a lance.
  • the pre-heating of a 60-ton capacity dundish for continuous steelmaking was carried out before longevity.
  • Heat the L-gas as a heat source for about 90 minutes to raise the temperature of the dundish wall to 910 ° C.
  • oxygen mixed with 35% air is used as a carrier gas, and sprayed through a lance to heat the calo, and after the wall temperature of the dundish reaches 1,390 , Did the integration work.
  • the results were as follows.
  • the consumed waste plastic granulated product was 3 O kg, and the consumption of oxygen mixed with 35% of air was 540 Nm 3 .
  • the order concentration of the pieces at the beginning of llfii was remarkably reduced as compared with the conventional method.
  • a comparison between the present invention and the conventional method will be shown.
  • a 70-ton steelmaking ladle was preheated and heated. Liquefied natural gas was used as a heat source, and after the bottom surface temperature of the ladle reached 950, 85 Sfi% of polyethylene-based waste plastic and 15 Efi9 of phenol-based waste plastic were granulated to a particle diameter of 1.7 mm.
  • the preheating of the ladle was performed by using a lance as a carrier gas containing oxygen containing the air-warming agent 38% in air as a carrier gas. The comparison between the present invention and the conventional method is shown below.
  • the steel and steel slag remaining in the dandy after continuous sintering are removed using the heating agent of the present invention.
  • a dissolution removal operation was performed.
  • Waste plastic made of polypropylene-based waste plastic with a particle diameter of 1.8 mm is mixed with a heating agent containing 5% by weight of sodium peroxide in a 55% air volume. Then, steel and steel slag remaining in the dundish were removed.
  • a comparison between the present invention and the conventional method will be shown.
  • the present invention is a.
  • the waste plastic granulated product of the present invention consisting of 70% by weight of polyethylene and 30% by weight of polypropylene; a particle diameter of 1.7 mm was blown from the bottom tuyere of the converter using pure oxygen as a carrier gas. Temperature. The following shows a comparison with the conventional tuyere injection of coke powder (particle size of 5 mm or less) at the bottom tuyere.
  • the present invention m
  • the heating agent of the present invention is 40% by weight of aluminum dross, which contains 95% by weight of waste polyethylene plastic and 5% by weight of melamine waste plastic, 60% by weight of granules having a particle diameter of 2 mm, and 30% of metal aluminum content.
  • the mixture is then injected into molten steel together with oxygen through a lance.
  • a mixture of 60% coke powder with a particle size of 5 mm or less and 40% aluminum dross containing 30% metallic aluminum is mixed.
  • the molten steel was subjected to infusion as a heating agent, and the heating was compared.
  • the present invention is a.
  • waste plastics which are often discarded and landfilled, can be used for refining, manufacturing, preheating of containers and molten metal, and extremely high temperature for dissolving slag, container residues and attachments. It can be used as a facilitator. In addition, it can greatly contribute to saving natural gas and natural fuels that have been used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing Of Solid Wastes (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Dans le cas d'une solidification d'un laitier sur un conteneur, dans un métal en fusion, et à la surface d'un métal en fusion, où des résidus et un dépôt se trouvant dans le conteneur sont préchauffés, chauffés et fondus lors d'une opération d'affinage et de coulage d'un métal, on utilise une poudre fine de plastique résiduaire de thermoramollissement seul, ou une poudre fine d'un mélange de ce plastique et d'un plastique résiduaire de thermodurcissement comme agent favorisant la combustion et l'élévation de température. Ceci permet d'améliorer l'effet chauffant et de réduire considérablement les dépenses en gaz naturel.
PCT/JP1994/001507 1994-09-12 1994-09-12 Agent augmentant la temperature et procede d'augmentation de la temperature WO1996008328A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU76245/94A AU7624594A (en) 1994-09-12 1994-09-12 Temperature increasing agent and temperature increasing method
PCT/JP1994/001507 WO1996008328A1 (fr) 1994-09-12 1994-09-12 Agent augmentant la temperature et procede d'augmentation de la temperature
KR1019960702459A KR960705645A (ko) 1994-09-12 1994-09-12 승온제 및 승온방법

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1994/001507 WO1996008328A1 (fr) 1994-09-12 1994-09-12 Agent augmentant la temperature et procede d'augmentation de la temperature

Publications (1)

Publication Number Publication Date
WO1996008328A1 true WO1996008328A1 (fr) 1996-03-21

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ID=14098649

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Application Number Title Priority Date Filing Date
PCT/JP1994/001507 WO1996008328A1 (fr) 1994-09-12 1994-09-12 Agent augmentant la temperature et procede d'augmentation de la temperature

Country Status (3)

Country Link
KR (1) KR960705645A (fr)
AU (1) AU7624594A (fr)
WO (1) WO1996008328A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998052703A1 (fr) * 1997-05-19 1998-11-26 Aikoh Co., Ltd. Procede d'evacuation des dechets
WO1999034022A1 (fr) * 1997-12-26 1999-07-08 Nkk Corporation Procede de raffinage de fer fondu et procede de fusion reductrice permettant de produire ce fer fondu
JP2016108638A (ja) * 2014-12-10 2016-06-20 Ｊｆｅスチール株式会社 転炉用昇熱材

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2905632A (en) * 1954-12-01 1959-09-22 Exxon Research Engineering Co Preparation of attrition resistant alumina for use as a catalyst support in a hydrocarbon conversion process
EP0015801A1 (fr) * 1979-02-26 1980-09-17 Rhone-Poulenc Chimie Procédé de fabrication de billes d'alumine à double porosité
EP0417629A1 (fr) * 1989-09-12 1991-03-20 The Geon Company Support de catalyseur résistant à l'attrition

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2905632A (en) * 1954-12-01 1959-09-22 Exxon Research Engineering Co Preparation of attrition resistant alumina for use as a catalyst support in a hydrocarbon conversion process
EP0015801A1 (fr) * 1979-02-26 1980-09-17 Rhone-Poulenc Chimie Procédé de fabrication de billes d'alumine à double porosité
EP0417629A1 (fr) * 1989-09-12 1991-03-20 The Geon Company Support de catalyseur résistant à l'attrition

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998052703A1 (fr) * 1997-05-19 1998-11-26 Aikoh Co., Ltd. Procede d'evacuation des dechets
WO1999034022A1 (fr) * 1997-12-26 1999-07-08 Nkk Corporation Procede de raffinage de fer fondu et procede de fusion reductrice permettant de produire ce fer fondu
US6837916B2 (en) 1997-12-26 2005-01-04 Nkk Corporation Smelting reduction method
JP2016108638A (ja) * 2014-12-10 2016-06-20 Ｊｆｅスチール株式会社 転炉用昇熱材

Also Published As

Publication number Publication date
AU7624594A (en) 1996-03-29
KR960705645A (ko) 1996-11-08

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