WO2017051586A1 - Appareil de fusion et procédé de fusion de copeaux d'aluminium - Google Patents

Appareil de fusion et procédé de fusion de copeaux d'aluminium Download PDF

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Publication number
WO2017051586A1
WO2017051586A1 PCT/JP2016/069969 JP2016069969W WO2017051586A1 WO 2017051586 A1 WO2017051586 A1 WO 2017051586A1 JP 2016069969 W JP2016069969 W JP 2016069969W WO 2017051586 A1 WO2017051586 A1 WO 2017051586A1
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WIPO (PCT)
Prior art keywords
aluminum
melting
oil
chips
melting furnace
Prior art date
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PCT/JP2016/069969
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English (en)
Japanese (ja)
Inventor
秀昭 楢原
俊治 岩崎
洋二 青木
峻輔 蒔田
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株式会社広築
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Priority to JP2017541453A priority Critical patent/JP6452182B2/ja
Publication of WO2017051586A1 publication Critical patent/WO2017051586A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B14/14—Arrangements of heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/08—Screw feeders; Screw dischargers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases, or liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • 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
    • 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
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to an aluminum chip melting apparatus and a melting method, and in particular, in obtaining a molten aluminum by melting chips that are cutting scraps of aluminum metal or alloy, pay attention to environmental protection, and provide safe and energy-saving operation.
  • the present invention relates to an aluminum chip melting apparatus and a melting method that can be achieved.
  • Aluminum metal requires a large amount of power for its production, so its production cost is high. Therefore, as long as scrap and scrap generated when processing into an aluminum product take the form of aluminum metal, the value is great in consideration of the manufacturing cost. Therefore, it is usual to recycle and melt aluminum scraps, cans and the like to obtain molten aluminum, and then to make aluminum products, and aluminum metal cutting scraps, so-called aluminum chips, are similarly treated.
  • This equipment is good in that aluminum chips can be reused, but the equipment requires a large variety of equipment, etc., and when it is dried and calcined, it is used in dust collectors and ducts with aluminum dust generated from the rotary kiln. There were problems such as the risk of ignition and explosion.
  • return materials, cans, and briquettes containing chips such as aluminum are indirectly heated in the preheating tower using the combustion exhaust gas from the melting and holding furnace to burn off the oil, etc.
  • Prior art for charging to obtain molten metal is disclosed.
  • the above prior art is excellent in that it is preheated so as not to oxidize the return material and briquette material containing chips by indirect heating, but the oil adhering to the material to be melted such as chips is heated and evaporated in the inner case. After that, it is said that it is possible to effectively suppress flue gas generation because it can be removed by entrapping and burning new air at the upper end of the preheating tower, but it is difficult to completely prevent flue gas generation, and oil etc. are retained There were problems such as not using latent heat energy.
  • An object of the present invention is to provide an aluminum chip melting apparatus and a melting method capable of saving energy and preventing air pollution by substituting fuel for gasification of oil in a melting furnace, inviting it to a heating burner of the melting furnace, and burning it. It is what.
  • an aluminum chip melting apparatus comprises a drying / preheating means for removing moisture in the cutting oil adhered to the aluminum chip, and the dried / preheated aluminum chip.
  • An oil gasification combustion means is provided.
  • the cutting oil used for producing aluminum products by cutting aluminum an emulsion obtained by diluting water-soluble cutting oil with water is often used. Therefore, since the aluminum chips that are cutting scraps are accompanied by 10 to 20 wt% of cutting oil with respect to the oil-containing chips, a mixture of oil and water is attached. The breakdown is 5 to 15 wt% of oil and 1 to 5 wt% of water.
  • moisture is removed by heating and evaporation from the cutting oil accompanying the aluminum swarf, and only the oil is left and then charged into a melting furnace to obtain a molten aluminum.
  • the oil can be gasified and combusted as a partial substitute fuel for the heating burner of the melting furnace. As a result, it is possible to recover aluminum as a fuel for the melting furnace without recovering resources from the aluminum chips and gasifying the accompanying cutting oil to cause pollution such as air pollution.
  • the aluminum chip melting apparatus according to claim 2 is the aluminum chip melting apparatus according to claim 1, wherein the drying / preheating means conveys the aluminum chip by a drying / preheating screw conveyor in which the aluminum chips are sealed, The aluminum chips are dried and preheated by heating the outer peripheral wall of the screw conveyor while adjusting the temperature of the combustion exhaust gas from the crucible melting furnace.
  • an aluminum chip melting apparatus is the aluminum chip melting apparatus according to claim 1 or 2, wherein the crucible melting furnace is provided with a refractory partition wall in the depth direction of the molten metal pool.
  • the molten metal part is divided into a molten part and a molten part, and further provided with a refractory filter over the entire horizontal cross section below the molten surface of the molten part, and the dried and preheated aluminum chips are It is charged into the molten metal at the lower part of the filter by charging means, and the aluminum chips are melted, and the oil component derived from the cutting oil accompanying the aluminum chips is gasified and the oil gas is taken out from the upper surface of the melting part.
  • the combustion burner is used for combustion.
  • the aluminum chips accompanying the oil are forcibly inserted into the lower part of the filter of the melting part, and the upward movement of the aluminum chips is suppressed by the filter. Then, the molten aluminum passes under the partition wall and moves to the molten metal part, and finally is discharged from the tapping tank.
  • the partition wall prevents the molten metal from short-circuiting and takes a long residence time.
  • the slag component which is an impurity, can be floated and separated, and the molten metal is sufficiently cleaned.
  • the oil is easily gasified because the oil-containing chips are sufficiently heated under the filter, floats through the filter, moves to the space above the melt, and then has a venturi effect on the combustion burner. Attracted and burned to replace the fuel, contributing to energy savings as well as saving fuel from melting aluminum.
  • An aluminum chip melting apparatus is the aluminum chip melting apparatus according to claim 3, wherein the melting part of the crucible melting furnace removes the dried and preheated aluminum chips in the lower part of the filter.
  • a stirrer that rotates in proximity to the charging means that is charged into the molten metal and a stirrer capable of injecting an inert gas of nitrogen or argon from the rotating shaft is provided, and the stirrer promotes dissolution of the aluminum chips. It is characterized by that.
  • the aluminum chips charged by the charging means are forcibly stirred and dispersed over a wide range with a stirring blade, and the aluminum chips are dissolved and oil content by finely diffusing the aluminum chips by inert gas injection. Gasification can be promoted.
  • An aluminum chip melting apparatus is the aluminum chip melting apparatus according to any one of claims 1 to 4, wherein the charging means is configured so that a discharge end of the drying / preheating screw conveyor is at an upper portion.
  • a connection opening is formed in the upper part of a closed charging hopper provided with a steam discharge valve, and a vertical or inclined charging screw conveyor is provided below the melting part filter of the crucible melting furnace from the lower part of the charging hopper. It is provided so that the lower end is immersed, and the dried and preheated aluminum chips are put into the molten metal by the charging screw conveyor and the inert gas of nitrogen or argon gas from the charging screw conveyor rotary shaft tube. It is characterized by charging in.
  • An aluminum chip melting apparatus is the aluminum chip melting apparatus according to any one of claims 1 to 4, wherein the charging means is configured such that the discharge end of the hermetic screw conveyor is steamed upward.
  • a connection opening is made in the upper part of the closed charging hopper provided with a discharge valve, and an inclined pusher is immersed from the lower part of the charging hopper below the melting part filter of the crucible melting furnace. The dried and preheated aluminum chips are charged into the molten metal by the pusher.
  • the aluminum chips can be forcibly charged into the melting furnace without being greatly affected by properties such as the particle size of the aluminum chips.
  • the charging amount is easily adjusted by the frequency of inserting the pusher, it is easy to control the dissolution amount of the chips.
  • An aluminum chip melting apparatus is the aluminum chip melting apparatus according to any one of claims 1 to 6, wherein the oil gasification combustion means includes a melting section and a molten metal of the crucible melting furnace.
  • the oil gasification combustion means includes a melting section and a molten metal of the crucible melting furnace.
  • a pipe connected to the combustion part of the combustion burner from the upper space of the part, and a venturi part connected to the combustion part at the end of the pipe, and the dried and preheated aluminum chips in the melting part of the melting furnace.
  • the oily gas generated during melting is collected and attracted to the combustion burner of the melting furnace for burning.
  • the oil content in the cutting oil accompanying the aluminum chips is gasified and recovered in the melting part of the melting furnace, and is sent to the combustion burner part via the venturi part by piping (duct). It burns with the flame of a combustion burner. This produces the effect of substituting the fuel for the combustion burner.
  • An aluminum chip melting apparatus is the aluminum chip melting apparatus according to any one of claims 1 to 7, wherein the drying / preheating means has a temperature at which the aluminum chip is dried / preheated.
  • the temperature range is from 125 ° C to 145 ° C, preferably 135 ° C.
  • the aluminum chips of the present invention are accompanied by an oil component derived from cutting oil.
  • this cutting oil is in an emulsion state of oil and water, and the amount thereof is in the range of 5 to 15 wt% for oil and 1 to 5 wt% for water with respect to the cutting oil containing cutting oil.
  • thermogravimetric-differential thermal analysis TG-DTA analysis
  • the oil content remains by setting the drying / preheating temperature of the aluminum chips accompanying the cutting oil in the range of 135 ⁇ 10 ° C., preferably 135 ° C. ,
  • the moisture can be evaporated, the melting of the aluminum chips in the melting furnace and the gasification of the oil can be carried out while maintaining the high temperature in the melting furnace, and the hydrogen content of the molten aluminum can be reduced. .
  • an aluminum chip melting apparatus is the aluminum chip melting apparatus according to any one of claims 1 to 8, wherein the drying / preheating means includes moisture in the aluminum chip after drying / preheating. Is 5% or less, preferably 1% or less.
  • the amount of water remaining in the charged aluminum chips is reduced, so the melting capacity is reduced without causing a temperature drop in the molten metal. It can be maintained and improved efficiently.
  • the amount of aluminum chips charged in the melting furnace and the gasification of oil can be more efficiently improved when the water content of the charged aluminum chips is 1% or less.
  • An aluminum chip dissolving apparatus is the aluminum chip dissolving apparatus according to any one of claims 1 to 9, wherein a centrifugal oil-water separator is provided upstream of the aluminum chip dissolving apparatus.
  • a pretreatment for reducing the amount of cutting oil adhering to the aluminum chips is performed by an oil / water separator.
  • the cutting oil can be physically separated by a centrifugal oil / water separator and its content can be easily reduced, and then there is a margin in the ability to heat and dehydrate with a screw conveyor that is a drying / preheating means.
  • a centrifugal oil / water separator it is possible to mainly reduce the moisture in the cutting oil adhering to the aluminum chips and efficiently preheat the chips. Therefore, by adding this centrifugal oil water separator to the aluminum chip dissolving device, the melting capacity of aluminum chips accompanied with cutting oil is improved, or the dissolution of aluminum chips accompanied by excess cutting oil Processing can be enabled.
  • the aluminum chip melting method according to claim 11 is a method of melting the aluminum chip to which cutting oil is adhered, and the aluminum chip is in the range of 125 ° C. to 145 ° C., preferably 135 ° C.
  • the crucible is dried and preheated by indirect heating using the exhaust gas of the crucible melting furnace to evaporate and remove moisture in the cutting oil, and then the dried and preheated aluminum chips are heated with a combustion burner.
  • the oil content in the cutting oil is gasified, and the gas is supplemented and used as fuel for indirect heating of the crucible melting furnace.
  • the molten aluminum is characterized in that only the molten metal is transferred from the melting part to the molten metal part of the crucible melting furnace to obtain a clean molten aluminum.
  • the method of the present invention is an aluminum chip melting method suitable for resource saving and energy saving.
  • the accompanying oil content of aluminum chips can be gasified in a high-temperature melting furnace and recovered as fuel in a closed circuit, so there is a risk of causing pollution such as air pollution compared to conventional methods in which oil is simply burned. It also contributes to the reduction of dissolved fuel.
  • the method for melting aluminum chips according to claim 12 is the method for melting aluminum chips according to claim 11, wherein the dried and preheated aluminum chips are charged into molten aluminum in the melting part of the crucible melting furnace. When dissolved, the mixture is stirred and mixed by a mechanical stirrer or inert gas injection to promote dissolution and oil gasification.
  • the aluminum chips charged in the melting part are forcibly stirred and dispersed over a wide range, and the aluminum chips are finely diffused by inert gas injection to dissolve the aluminum chips and gasify the oil. Can be promoted.
  • a high-quality aluminum melt can be obtained using aluminum chips accompanied by cutting oil as a raw material, and the cutting By efficiently gasifying the oil content of the oil in a closed circuit, a part of the fuel of the melting burner can be replaced. As a result, it is possible to replace dissolved fuel by recovering aluminum resources from the aluminum chips and recovering the energy stored in the associated oil, thereby contributing to resource utilization and energy saving.
  • this aluminum chip melting device is composed of equipment that has been used in a compact manner, has a smaller installation area than conventional ones, and does not require significant equipment costs. Also excellent equipment.
  • FIG. 1 is a schematic front sectional view of an aluminum chip melting apparatus according to an embodiment for carrying out the present invention.
  • FIG. 2 is a schematic side cross-sectional view in FIG.
  • FIG. 3 is a schematic cross-sectional view of a flue gas system connected to the drying / preheating device in FIG. 4 is a schematic cross-sectional view taken along the line AA in FIG.
  • FIG. 5 is a schematic front sectional view of an aluminum chip melting apparatus according to another embodiment for carrying out the present invention.
  • FIG. 6 is a schematic front sectional view of an aluminum chip melting apparatus according to another embodiment for carrying out the present invention.
  • FIG. 7 is a schematic cross-sectional view of a flue gas system connected to the drying / preheating device in FIG. 5 or FIG. FIG.
  • thermogravimetric-differential thermal analysis chart of the cutting oil for aluminum It is a figure which shows the effect of the nitrogen gas injection in aluminum chip melt
  • drying and preheating step (b) of the aluminum chips accompanied with cutting oil drying and preheating step (b) of the aluminum chips accompanied with cutting oil, charging step (c) of charging the dried and preheated aluminum chips into the melting furnace, and in the melting furnace holding the molten aluminum heated, It comprises a melting step (d) in which chips are charged and melted, and an oil gasification combustion step (e) in which oil gas obtained by gasifying oil in an aluminum melting furnace is burned in a melting furnace combustion burner.
  • An aluminum chip melting apparatus 1 will be described with reference to FIGS.
  • the aluminum chip melting apparatus 1 is equipped with a drying / preheating device 4 that removes moisture in the cutting oil adhered to the aluminum chip, and the dried / preheated aluminum chip is charged into the molten metal M of the crucible melting furnace 2.
  • a centrifugal oil / water separator (not shown) is provided in the preceding stage of the aluminum chip melting apparatus 1 to perform pretreatment to reduce the amount of cutting oil adhering to the aluminum chip, that is, the amount of excess oil moisture. .
  • this pretreatment means the excess oil and water content in the cutting oil adhered to the aluminum chips can be easily reduced without physical heating with a centrifugal oil / water separator, and then the aluminum chip melting apparatus 1 is dried and preheated. Since it can be further heated and dehydrated by the screw conveyor 4-2 as a means, the moisture in the cutting oil adhering to the aluminum chips can be efficiently reduced and preheated. Further, according to this apparatus, it is not necessary to use heat energy such as heating in the deoiled water, so there is no concern about air pollution associated therewith.
  • the aluminum swarf according to the present invention is mainly composed of cutting waste generated when an aluminum product is manufactured by cutting aluminum or an aluminum alloy. Therefore, the aluminum chips are accompanied by 10 to 20 wt% of the cutting oil with respect to the cutting oil containing chips 100, and normally, the cutting oil is an emulsion of oil and water, so that the amount of 5 to 15 wt% is used. A mixture of oil and 1-5 wt% water is adhered.
  • the aluminum chip melting apparatus 1 of the present invention removes moisture by heating and evaporating from the cutting oil associated with the aluminum chip, leaving only the oil content, and then charging it into the melting furnace 2 to melt the aluminum melt M.
  • the oil is gasified and combusted as a partial alternative fuel for the heating burner 6 of the melting furnace 2.
  • the oil is gasified and combusted as a partial alternative fuel for the heating burner 6 of the melting furnace 2.
  • the drying / preheating device 4 in the aluminum chip melting apparatus 1 is a drying / preheating screw conveyor 4-2 in which aluminum chips are rotated from a charging hopper 4-1 by a variable speed drive geared motor 4-2e.
  • the screw conveyor 4-2 is inserted into the drying / preheating chamber 4-3, and the screw conveyor outer cylinder 4-2b is passed through the combustion exhaust gas duct 8 from the crucible melting furnace 2.
  • the aluminum chips are dried and preheated by adjusting the temperature with the cold air from the dilution air inlet 8-1 and introducing it into the drying / preheating chamber 4-3 and heating.
  • the flow rate and temperature of the drying / preheating gas are determined by the values of the indoor pressure gauge 4-3d and the thermometer 4-3c provided in the drying / preheating chamber 4-3, and the damper and combustion exhaust gas at the dilution air inlet 8-1.
  • the degree of opening / closing of the damper 8-2 of the duct 8 can be adjusted.
  • the temperature for drying and preheating the aluminum chips is in the range of 125 ° C. to 145 ° C., preferably 135 ° C.
  • aluminum chips are accompanied by oil and moisture derived from cutting oil. Therefore, in the present invention, cutting oil used for the purpose of evaporating moisture by heating and leaving the oil (trade name: cedar cut) Thermogravimetric-differential thermal analysis (TG-DTA analysis) of CS-68DN-2) was performed. As a result, as shown in FIG. 9, it was found that moisture was removed by heating up to around 135 ° C., and the oil was oxidized and generated heat in the region of 200 to 500 ° C.
  • the drying / preheating temperature of the aluminum chips is in the range of 135 ⁇ 10 ° C., preferably 135 ° C.
  • the oil remains and the water can be removed in an evaporated state.
  • the melting furnace 2 can maintain a high temperature without lowering the melting temperature, and the hydrogen content of the molten aluminum M can be reduced. It leads to reduction.
  • the crucible type melting furnace 2 of the aluminum chip melting apparatus 1 has a melting furnace combustion chamber 7 surrounded by a furnace wall refractory 7-1 and a furnace lid refractory 7-2. It is installed on the furnace mounting table 2-5.
  • the melting furnace combustion burner 6 is provided at a corner near the bottom of the melting furnace combustion chamber 7, and the combustion exhaust gas outlet is located above the melting furnace combustion chamber 7 as shown in FIGS. Since the axis is shifted, the flame of the combustion burner 6 heats the crucible melting furnace 2 as a swirling flow licking the outer wall of the crucible melting furnace 2 from bottom to top.
  • the crucible melting furnace 2 is mainly formed of a carbonaceous refractory in a bowl shape, holds an aluminum melt M having a melting point of about 660 ° C. inside, and a swirl flow flame from the bottom to the top of the melting furnace combustion burner 6. Therefore, the melting furnace 2 is indirectly heated by the combustion burner 6. Since the melting furnace combustion chamber 7, the furnace upper space 2-4, and the inside of the melting furnace 2 are isolated by the refractory of the melting furnace 2, the atmosphere state is completely different. Usually, the combustion chamber temperature of the melting furnace is in the range of 700 ° C to 1000 ° C.
  • the size of the crucible melting furnace 2 is about 600 mm in diameter and about 500 mm in height when the melting amount of aluminum chips is 50 to 100 kg / hr.
  • the crucible melting furnace 2 of the aluminum chip melting apparatus 1 is connected to the molten metal pan 3 by a refractory partition wall 2-2 in the depth direction of the molten metal M pool. 1 is divided into a melted portion 2-b and a melted portion 2-a, and further below the surface of the melted portion 2-a as shown in FIGS. A refractory filter 2-3 is provided over the entire horizontal cross section.
  • the dried and preheated aluminum chips are accompanied by an inert gas such as nitrogen or argon by the vertical or inclined charging screw conveyor 5-2 of the charging device 5 or the inclined pusher.
  • a stirring blade rotating in the vicinity of the charging means 5 for charging the dried and preheated aluminum chips into the molten metal M below the filter 2-3 a stirring blade rotating in the vicinity of the charging means 5 for charging the dried and preheated aluminum chips into the molten metal M below the filter 2-3.
  • a stirrer 3 including a 3-1 and a rotating shaft 3-3 is provided. Further, the stirrer 3 can inject an inert gas of nitrogen from the rotating shaft 3-3, and the aluminum chips charged by the stirrer 3 are forcibly dispersed with a stirring blade 3-1 over a wide range. At the same time, by finely diffusing the aluminum chips by inert gas injection, dissolution of the aluminum chips and gasification of the oil can be promoted.
  • FIG. 10 shows the result of confirming the effect of nitrogen (N 2 ) injection on the dissolution of the above-described aluminum chips in the molten aluminum M in an experimental furnace.
  • the aluminum chips chips having a water content of 1% or less and an oil content of 1.5 to 2% after drying were used.
  • the elapsed time after charging aluminum chips was 10 to 20 minutes, and the dissolved ratio (dissolution efficiency) was 50 to 65%.
  • a dissolution rate (dissolution efficiency) of 65 to 85% was obtained in 3 to 10 minutes after the charging. From these, by performing nitrogen (N 2) injection in the aluminum melt M, the dissolution of aluminum chips was confirmed the possibility of achieving in a short time efficiently.
  • the chip charging device 5 of the aluminum chip melting apparatus 1 is opened by connecting the discharge end 4-2d of the drying / preheating screw conveyor 4-2 to the upper part of the hermetic charging hopper 5-1.
  • a steam discharge valve 5-3 is provided in the upper lid portion of the charging hopper 5-1.
  • a vertical or inclined charging screw conveyor 5-2 that is rotationally driven by a variable speed drive geared motor 5-2d from the lower portion of the charging hopper 5-1 is a melting part filter of the crucible melting furnace 2. 2-4 is provided so that its lower end is immersed, and dried and preheated aluminum chips are charged into the molten metal M by the charging screw conveyor 5-2, and nitrogen, which is an inert gas, is used at that time.
  • the vertical charging screw conveyor is more susceptible to changes in the charging speed depending on the degree of aluminum chip filling compared to the inclined charging screw conveyor. Adjustment is easy.
  • an inclined pusher 5-4 can be provided in place of the vertical or inclined charging screw conveyor 5-2.
  • the inclined type pusher 5-4 is used for melting the crucible melting furnace 2 from the lower part of the charging hopper 5-1 to which the hermetic screw conveyor 4-2 is connected to the upper part of the hermetic charging hopper 5-1.
  • the lower end of the partial filter 2-3 is provided so that its lower end is immersed, and dried and preheated aluminum chips can be charged into the molten metal M by the pusher 5-4.
  • it is intermittent by this inclined type pusher 5-4 it becomes possible to forcibly insert aluminum chips into the molten metal M of the melting part 2-a of the melting furnace 2.
  • the inclined pusher 5-4 it is possible to forcibly charge the aluminum chips into the melting furnace 2 without being greatly affected by the properties such as the particle size of the aluminum chips. Further, it is preferable that the inclined pusher 5-4 is driven by an air-driven rodless cylinder 5-4a. Also, the pusher tip 5-4b of the inclined pusher 5-4 is cut obliquely so that the aluminum chips can be easily pushed into the molten metal M. Further, since the charging amount can be easily adjusted by the charging frequency of the pusher 5-4, it is easy to control the dissolution amount of the chips.
  • the oil gas that has been gasified in the melting furnace 2 of the aluminum chip melting apparatus 1 and accumulated in the furnace upper space 2-4 is recovered from the gas from the furnace upper space 2-4 to the combustion part of the combustion burner 6. Since the duct 9 is provided and the venturi section 9-1 connected to the combustion section is provided at the end of the oil gas recovery duct 9, the oil gas generated from the melting furnace 2 is attracted and guided, and the melting furnace combustion burner 6 Can be burned in a flame. Thereby, a partial replacement of the fuel for the melting furnace combustion burner 6 becomes possible.
  • the cutting oil containing aluminum cutting powder can select the pre-processing of a centrifugal oil-water separator according to the amount of cutting oil contained. Then, the aluminum chips accompanied with the cutting oil are dried and preheated by indirect heating to a range of 125 ° C. to 145 ° C., preferably 135 ° C., to evaporate and remove moisture in the cutting oil, and then the drying -The preheated aluminum chips are charged into the melting part 2-a of the crucible melting furnace 2 heated by the combustion burner 6 and melted, whereby the oil in the cutting oil is gasified and the gas is melted into the crucible.
  • the molten aluminum is used as a fuel for the combustion burner 6 of the furnace 2, and the molten aluminum is transferred only from the melting part 2-a of the crucible melting furnace 2 to the molten metal part 2-b to obtain a clean molten aluminum M It is get those.
  • the outer cylinder 4-2b of the drying / preheating screw conveyor 4-2 is heated with melting furnace combustion exhaust gas at a predetermined temperature, so that the conveying aluminum cutting of the screw conveyor 4-2 is performed.
  • the powder is accompanied by evaporation of moisture, while the oil is not evaporated, and the aluminum chips are preheated and sent to the charging hopper 5-1 of the next-stage chip charging apparatus 5.
  • the water vapor is discharged into the hopper space and passes through the steam discharge port 5-3. To the atmosphere.
  • the preheated aluminum chips containing oil are deposited in the charging hopper 5-1 and then charged into the melting furnace 2.
  • Aluminum chips accompanied by oil are conveyed in a filled state from a charging hopper 5-1 by a vertical or inclined screw conveyor 5-2, and are moved to the lower area of the filter 2-3 of the melting part 2-a of the melting furnace 2. Then, it is charged together with an inert gas ejected through the screw rotating shaft 5-2c. Further, the aluminum chips are bubbling of the inert gas injection and the diffusion of the stirrer 3 by the stirring of the stirrer blade 3-1 of the stirrer 3 and the injection of the nitrogen gas outlet 3-3 of the rotating shaft 3-2. As a result, the oil melts more quickly to become the molten metal M, and the oil is gasified.
  • the molten aluminum M passes under the partition wall 2-2 and moves to the molten metal part 2-b, and finally is discharged from the hot water tank 2-1.
  • the molten metal M is prevented from flowing due to a short circuit by the partition wall 2-2, and by taking a long residence time, the molten metal M is sufficiently cleaned by levitating and separating impurities such as slag components.
  • the oil component is heated in the region under the filter 2-2 under the bubbling of the inert gas to be gasified without being oxidized, passes through the filter 2-2, floats up, and passes through the furnace upper space 2-4.
  • the fuel is replaced by the fuel by being attracted by the venturi section 9-1 in the combustion zone of the combustion burner 6 via the oil gas recovery duct 9 and burned, thereby contributing to energy saving and fuel saving.
  • the aluminum chips accompanied with oil are intermittently forced from the charging hopper 5-1 by the inclined charging pusher 5-3 to filter the aluminum chips in the melting part 2-a of the melting furnace 2.
  • 2-3 Can be charged into the molten metal M in the lower area.
  • the charged aluminum chips are rapidly melted by diffusion by the stirring of the stirring blade 3-1 of the adjacent stirrer 3 and the injection of the nitrogen gas outlet 3-3 of the rotating shaft 3-2. As it becomes M, the oil is gasified.
  • the molten aluminum M passes under the partition wall 2-2 and moves to the molten metal part 2-b, and finally is discharged from the hot water tank 2-1.
  • the molten metal M is prevented from flowing due to a short circuit by the partition wall 2-2, and by taking a long residence time, the molten metal M is sufficiently cleaned by levitating and separating impurities such as slag components.
  • the oil component is heated in the region under the filter 2-2 under the bubbling of the inert gas to be gasified without being oxidized, passes through the filter 2-2, floats up, and passes through the furnace upper space 2-4.
  • the fuel is replaced by the fuel by being attracted by the venturi section 9-1 in the combustion zone of the combustion burner 6 via the oil gas recovery duct 9 and burned, thereby contributing to energy saving and fuel saving.
  • the cutting oil contained in the aluminum chips includes cutting oil mainly composed of oil that does not contain water, apart from the oil composed of the oil and water targeted by the present invention.
  • the aluminum chip melting apparatus and the melting method of the present invention can be sufficiently applied to aluminum chips containing cutting fluid having no moisture. In this case, there is no need for energy to evaporate water as much as it does not contain water, the preheating temperature of the aluminum chips themselves is likely to rise, the processing capacity of the aluminum chips by this device is easy to improve, and the heat required for melting It becomes easy to save energy.
  • the molten aluminum M can be obtained with high thermal efficiency by using the aluminum chips accompanied with the cutting oil as a raw material, evaporating the accompanying moisture, and dissolving the preheated aluminum chips.
  • the oil component is gasified and recovered in the melting furnace 2 and can be used as a substitute for the fuel in the melting furnace 2, the present invention is an aluminum chip melting apparatus and method suitable for resource saving and energy saving.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)

Abstract

La présente invention concerne un appareil de fusion de copeaux d'aluminium qui fond des copeaux, qui sont des déchets d'aluminium métallique ou d'alliage d'aluminium, pour obtenir de l'aluminium fondu. Cet appareil de fusion de copeaux d'aluminium est caractérisé en ce qu'il est pourvu : d'un appareil centrifuge de séparation huile-eau, qui réduit l'eau huileuse dans l'huile de coupe adhérant à des copeaux d'aluminium ; d'un moyen de séchage/préchauffage pour éliminer l'eau dans l'huile de coupe adhérant aux copeaux d'aluminium ; d'un moyen de charge destiné à charger les copeaux d'aluminium séchés/préchauffés dans le métal en fusion dans un four de fusion à creuset ; d'un moyen de fusion de l'aluminium pour faire fondre les copeaux d'aluminium séchés/préchauffés à l'aide du four de fusion à creuset et produire de l'aluminium fondu ; et d'un moyen de combustion de gazéification d'huile pour gazéifier l'huile restant dans les copeaux d'aluminium séchés/préchauffés à l'aide du four de fusion à creuset et brûler le résultat avec un brûleur de combustion.
PCT/JP2016/069969 2015-09-26 2016-07-06 Appareil de fusion et procédé de fusion de copeaux d'aluminium WO2017051586A1 (fr)

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CN109059540A (zh) * 2018-08-21 2018-12-21 陈孝 一种废铝熔炼炉
CN109883197A (zh) * 2019-03-22 2019-06-14 陈孝 一种铝型材冶炼炉
JP2019183275A (ja) * 2018-03-30 2019-10-24 株式会社広築 アルミニウム切粉の溶解方法及び溶解装置
CN111020218A (zh) * 2019-12-27 2020-04-17 浙江铂大工贸有限公司 一种铝屑废液回收处理装置
WO2021095731A1 (fr) * 2019-11-15 2021-05-20 株式会社トウネツ Dispositif de fusion de métal, tôle perforée pour fusion de métal et procédé de fusion de métal
WO2021235008A1 (fr) * 2020-05-22 2021-11-25 株式会社広築 Procédé et appareil de fusion de copeaux de coupe en aluminium
CN117427949A (zh) * 2023-12-19 2024-01-23 陕西天成航空材料股份有限公司 一种钛屑清洗装置

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AT522726A1 (de) * 2019-06-24 2021-01-15 Harald Dipl Ing Sehrschön Voorrichtung und Verfahren zum Schmeilzen von Spänen
CN111692601B (zh) * 2020-06-15 2022-04-01 浙江伊诺环保科技股份有限公司 一种飞灰处理系统

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JP2019183275A (ja) * 2018-03-30 2019-10-24 株式会社広築 アルミニウム切粉の溶解方法及び溶解装置
CN109059540A (zh) * 2018-08-21 2018-12-21 陈孝 一种废铝熔炼炉
CN109883197A (zh) * 2019-03-22 2019-06-14 陈孝 一种铝型材冶炼炉
CN114340816A (zh) * 2019-11-15 2022-04-12 株式会社东热 金属熔解装置、金属熔解用筛板和金属熔解方法
WO2021095731A1 (fr) * 2019-11-15 2021-05-20 株式会社トウネツ Dispositif de fusion de métal, tôle perforée pour fusion de métal et procédé de fusion de métal
CN114340816B (zh) * 2019-11-15 2024-04-05 株式会社东热 金属熔解装置、金属熔解用筛板和金属熔解方法
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CN111020218B (zh) * 2019-12-27 2022-06-21 浙江铂大工贸有限公司 一种铝屑废液回收处理装置
JP2021183712A (ja) * 2020-05-22 2021-12-02 株式会社広築 アルミニウム切粉の溶解方法と溶解装置
WO2021235008A1 (fr) * 2020-05-22 2021-11-25 株式会社広築 Procédé et appareil de fusion de copeaux de coupe en aluminium
CN117427949A (zh) * 2023-12-19 2024-01-23 陕西天成航空材料股份有限公司 一种钛屑清洗装置
CN117427949B (zh) * 2023-12-19 2024-03-05 陕西天成航空材料股份有限公司 一种钛屑清洗装置

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