CN114807650A - Production process for adding UBC (UBC-based scrap) recycled materials in smelting of aluminum alloy tank materials - Google Patents
Production process for adding UBC (UBC-based scrap) recycled materials in smelting of aluminum alloy tank materials Download PDFInfo
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Abstract
A production process for adding UBC recycled waste in smelting of aluminum alloy tank materials comprises the steps of preparing materials, feeding/feeding aluminum, smelting in a smelting furnace, stirring, slagging off, sampling, alloying, refining in the smelting furnace, slagging off, sampling confirmation in the smelting furnace, reversing the furnace, rapidly slagging off, sampling, adjusting components, refining in a holding furnace, slagging off, sampling confirmation in the holding furnace, standing, online grain refinement, online degassing refining, sampling confirmation before filtering, casting, finished product inspection and sawing and milling, wherein 30-60% of UBC composite materials are used in the feeding process; in the process, a floating solvent refining process is adopted in smelting of a smelting furnace and smelting of a holding furnace, so that slag inclusion in the aluminum melt reaches the standard before filtration, and the smelting quality of the aluminum alloy tank material adopting the UBC compound material can meet the use requirement, thereby solving the technical problem of uncontrolled melt purity (slag inclusion) caused by using the UBC compound material in the aluminum alloy tank material, and bringing good economic benefits to enterprises.
Description
Technical Field
The invention relates to the technical field of high-precision aluminum smelting production for aluminum alloy tank materials, in particular to a production process for adding UBC (UBC recovery waste) in aluminum alloy tank material smelting.
Background
The aluminum alloy tank body package has bright prospect in the future packaging market due to the characteristics of excellent comprehensive performance, high recycling rate, small environmental pollution and the like; beer canning, the improvement of the acceptance of canned foods and plastic limitation are three major driving factors for the future increase of metal packaging requirements.
The aluminum material for the aluminum alloy tank belongs to a high-end product in the aluminum processing industry, and has strict requirements on slag inclusion (impurities), gas (mainly H), alloy content and mechanical property, for example, the tolerance of 3004 and 3104 for pinhole and tank breakage production defects in the production of aluminum alloy tank bodies is 17ppm, the tolerance of 5052, 5042 and 5151 for production defects in aluminum alloy tank covers is 0ppm, and the high requirement also determines the high cost and high price of the aluminum material for the aluminum alloy tank; however, the recycling of UBC in China is still at a lower technical level at present, and the problem of uneven UBC recycling process exists, so that the compound material produced by recycling UBC has unstable chemical components and slag (impurities), and therefore, the method can only be used for packaging low-value products such as self-contained paint, advertising color, coating, dye, adhesive, seed and washing powder, small hardware parts and the like, and the UBC recycling value is lower.
Research shows that when the composite material produced by recycling UBC is used for producing aluminum alloy tank body materials, the main problems are that slag (impurities) and gas (mainly hydrogen) of the produced aluminum alloy tank body materials are high due to slag (impurities) inclusion of the UBC composite material, the continuity of metal aluminum is damaged due to the slag (impurities) and the gas, and stress concentration is easy to occur at the sharp corners of slag (impurities) inclusion phases due to different elastic moduli and expansion coefficients between the slag (impurities) and a metal machine body, the stress concentration is often used as a fracture source and a corrosion source of the materials, particularly in the thinning and stretching process of the alloy tank body, the metal plasticity and strength of the areas where the defects are located cannot meet the minimum requirements of thinning and stretching, and various product defects of the aluminum alloy tank body and the aluminum alloy tank cover are finally caused; therefore, how to improve the existing smelting production process of the aluminum alloy tank material enables the UBC compound material to be used for smelting production of the aluminum alloy tank material to produce qualified aluminum material for the aluminum alloy tank so as to improve the UBC recovery value, and becomes a technical problem to be solved urgently in the technical field of smelting production of the aluminum alloy tank material.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses a production process for adding UBC (UBC-based scrap) to recycle waste in smelting of an aluminum alloy tank material, which comprises the steps of preparing materials, feeding/feeding aluminum, smelting in a smelting furnace, stirring, slagging-off, sampling, refining in the smelting furnace, slagging-off confirmation in the smelting furnace, reversing the furnace, rapidly slagging-off, sampling, adjusting components, refining in a holding furnace, slagging-off, confirming in the holding furnace, standing, refining crystal grains on line, degassing and refining on line, confirming in sampling before filtering, casting, inspecting finished products and sawing and milling, wherein 30-60% of UBC composite material is used in the feeding process; in the process, a floating solvent refining process is adopted in smelting furnace smelting and holding furnace smelting, and slag content detection is added after the smelting furnace refining and holding furnace refining processes to fully ensure that the content of slag inclusion and gas of an aluminum melt before filtration reaches the standard, so that the quality of smelting the aluminum alloy tank material using the UBC compound material can meet the use requirement, and the UBC recovery value is improved.
In order to realize the purpose, the invention adopts the following technical scheme: a production process for adding UBC recycled waste in smelting of aluminum alloy tank materials comprises the steps of preparing materials, feeding/feeding aluminum, smelting in a smelting furnace, stirring, slagging off, sampling, alloying, refining in the smelting furnace, slagging off, sampling confirmation in the smelting furnace, turning over the furnace, quickly slagging off, sampling, adjusting components, refining in a holding furnace, slagging off, sampling confirmation in the holding furnace, standing, online grain refinement, online degassing and refining, sampling confirmation before filtering, casting, finished product inspection and sawing and milling; wherein the aluminum is an electrolytic aluminum melt; the allowable mass ratio (total aluminum melt mass) of the UBC compound material is 30-60%, the allowable mass ratio (total aluminum melt mass) of the self-production waste material is 10-70%, and the allowable mass ratio (total aluminum melt mass) of the electrolytic aluminum melt material is 0-60%; when the smelting furnace actually smelts, the actual mass ratio (total aluminum melt mass) of the UBC composite material, the self-produced waste material and the electrolytic aluminum melt material is determined by the following method: firstly, measuring the content of various alloying elements in a UBC complex material to be used, a self-produced waste material and an electrolytic aluminum melt material through spectral analysis, and making a production scheduling burdening table in advance by a burdening engineer according to the measured content of various alloying elements in the material to be used and the content of various alloying elements in an aluminum alloy tank material to be produced to ensure that various alloying elements in furnace burden (including the UBC complex material, the self-produced waste material and the electrolytic aluminum melt material) added into a smelting furnace do not exceed the upper limit value of various alloying elements of the aluminum alloy tank material to be produced;
during smelting, firstly adding UBC compound materials and self-produced waste materials into a smelting furnace for several times, and then adding electrolytic aluminum melt; when the temperature of the aluminum melt reaches above 720 ℃, taking a mother solution sample for component detection, calculating the mass of various intermediate alloys to be added according to the difference between the actual value of various alloying elements in the mother solution sample and the target value of various alloying elements of the aluminum alloy tank material to be produced, weighing, adding the intermediate alloys into the aluminum melt, fully heating and stirring, and then refining in a smelting furnace; in the refining of a smelting furnace and the refining of a heat preservation furnace, a floating solvent method is adopted for refining, degassing and deslagging; in the online degassing and refining, a floating method is adopted for refining, degassing and deslagging; compared with the existing aluminum alloy production process, the production process for adding UBC recycled waste in the smelting of the aluminum alloy tank material adopts a floating solvent method refining process in the smelting furnace and the smelting of the holding furnace, reduces slag inclusion of the aluminum melt through multiple refining processes, fully ensures that the slag inclusion and the gas content of the aluminum melt before filtration reach the standard, and ensures that the smelting quality of the aluminum alloy tank material adopting UBC composite material can meet the use standard.
Furthermore, in the sampling confirmation of the smelting furnace and the sampling confirmation of the holding furnace, the next procedure can be carried out only after the detection of the content and the component of the aluminum melt slag; if the smelting furnace is finished refining, sampling and confirming the smelting furnace, sampling and detecting the content of various alloying elements and the content of slag in the aluminum melt, and turning the aluminum melt into a holding furnace if the content of various alloying elements and the content of slag in the aluminum melt meet the process requirements; if the content of partial alloying elements or slag in the aluminum melt does not meet the process requirements, the mass of the intermediate alloy to be added needs to be recalculated, the intermediate alloy is weighed and added into the aluminum melt, the temperature is fully raised and stirred, the smelting furnace refining is carried out again, and at the moment, the floating method is adopted for refining, degassing and deslagging in the smelting furnace refining.
Further, a floating solvent method of smelting furnace refining is adopted for refining, degassing and deslagging, argon and a refining agent are simultaneously added into a molten aluminum melt, wherein the refining agent is a particle formed by mixing 43% of magnesium chloride (MgCl 2) and 57% of potassium chloride (KCl), and the particle refining agent can be adopted to reduce the dust emission phenomenon generated in the using process of the refining agent and improve the production site environment; the specific operation process conditions of refining, degassing and deslagging by a planktonic solvent method of smelting furnace refining are as follows:
s1.1, starting condition confirmation: melt temperature: 720-750 ℃; the alloying of the smelting furnace is finished; starting electromagnetic stirring; the temperature of melt refined by a smelting furnace is slightly higher than that of melting furnace refining and online degassing refining, but the highest temperature is not allowed to exceed 760 ℃, because the content of 3 series magnesium is about 1 percent and the content of 5 series magnesium is about 5 percent in an aluminum alloy tank material, the high melt temperature can form refractory aluminum magnesium oxide compound (MgAL 2O 4), namely spinel, and the influence of the existence of the substance on the continuity of the aluminum alloy is fatal, so the melt temperature needs to be strictly controlled;
s1.2, refining, degassing and deslagging by using a smelting furnace floating solvent: adding argon gas to the molten aluminum melt along with a refining agent via a hand-held refining tube inserted below the depth 2/3 of the molten aluminum melt; the argon flow is 150-175L/min, and the aeration time is 20-25 min; the dosage of the refining agent is 50 kg/one hundred tons of melt, and the refining agent is added into the molten aluminum melt at a constant speed along with argon within 15-20 minutes; in the process of refining, degassing and deslagging the floating solvent, the position of a refining point needs to be continuously moved so that the argon and the refining agent can be uniformly blended into the aluminum melt; the refining of the smelting furnace adopts a floating solvent refining degassing and deslagging process, argon is used as a carrier, a refining agent is uniformly added into the smelting furnace to carry out combined dehydrogenation and deslagging on an aluminum melt, and the smelting furnace has the advantages of high dehydrogenation and deslagging speed and high efficiency;
s1.3, after the refining agent is added into the molten aluminum melt, continuously maintaining pure argon for refining for 5 minutes, and immediately turning down the furnace after sampling confirmation through a smelting furnace; although the refining time of pure argon in the smelting furnace is short, and the refining agent "residues" are remained in the aluminum melt, the "residues" have sufficient time to escape from the aluminum melt in the subsequent smelting and transferring processes of the holding furnace, so the quality of the final casting of the aluminum alloy pot material is not influenced actually.
Further, refining, degassing and deslagging by a floating solvent method of heat preservation furnace refining, wherein argon and a refining agent are added into a molten aluminum melt, wherein the refining agent is a particulate matter formed by mixing 43% of magnesium chloride (MgCl 2) and 57% of potassium chloride (KCl); the specific operation process conditions of refining, degassing and deslagging by a floating solvent method of heat preservation furnace refining are as follows:
s2.1, starting condition confirmation: melt temperature: 720-730 ℃; adjusting the components of the holding furnace; starting electromagnetic stirring;
s2.2, refining, degassing and deslagging the heat preservation furnace by using a floating solvent: argon and a refining agent are added into the molten aluminum melt through the rotation and stirring of a graphite rotor arranged at the upper part of the holding furnace, and the depth of the graphite rotor inserted into the molten aluminum melt is 2/3; argon flow is 220 liters/minute, the dosage of the refining agent is 25 kilograms per hundred tons of melt, and the flow of the refining agent added into the molten aluminum melt is 0.5-2.5 kilograms per minute until all the refining agent is added along with the argon; similarly, the refining of the heat preservation furnace adopts a floating solvent refining degassing and deslagging process, and utilizes the advantages of high hydrogen removal and deslagging speed and high efficiency of the floating solvent refining degassing and deslagging process to control and shorten the refining time in the heat preservation furnace and avoid the increase of hydrogen content caused by overlong contact time of the aluminum melt with the atmosphere in the heat preservation furnace;
s2.3, after the refining agent is added into the molten aluminum melt, continuously introducing argon for refining for 5 minutes, and after sampling confirmation through a holding furnace, entering a standing process; although the refining time of pure argon in the holding furnace is short, the refining agent 'residues' are remained in the aluminum melt, the 'residues' have sufficient time to escape from the aluminum melt in the subsequent online degassing and refining process, and therefore the final casting quality of the aluminum alloy can material is not influenced; and if the sampling of the holding furnace confirms that the contents of partial alloying elements or slag in the aluminum melt do not meet the process requirements, recalculating the mass of the intermediate alloy to be added, weighing the intermediate alloy, adding the intermediate alloy into the aluminum melt, fully heating and stirring, refining the holding furnace again, and refining the holding furnace by adopting a floating method to remove gas and slag until the sampling of the holding furnace confirms that the intermediate alloy passes.
Further, refining, degassing and deslagging by a floating method of online degassing and refining, wherein a mixed gas of argon and chlorine is added into the molten aluminum melt, wherein the volume ratio of the argon to the chlorine is 200: 1; the mixed gas of argon and chlorine is added into the molten aluminum melt through the rotary stirring of a plurality of gas-filling rotors arranged at the bottom of the degassing tank; the refining of online degassing adopts the refining degassing and deslagging of the floating method, because online degassing refining is the last refining of online filtration of the aluminum melt, and the refining of the floating method can avoid the refining agent from producing new 'residue';
the specific operation process conditions of the on-line degassing and refining flotation method for degassing and deslagging are as follows:
s3.1, starting condition confirmation: melt temperature: 700-720 ℃; on-line grain refinement has been performed; starting the gas-filling rotor to rotate;
s3.2, refining, degassing and deslagging by an online degassing and floating method: the mixed gas of argon and chlorine is added into the molten aluminum melt through the rotary stirring of a plurality of gas-filling rotors arranged at the bottom of the degassing tank; the flow rate of the mixed gas is 175-200L/min.
Further, detecting the slag content by using a Prefil-Footprinter; comparing the slag content detection result curves in the smelting furnace sampling confirmation, the holding furnace sampling confirmation and the sampling confirmation before filtering with the corresponding Prefil-Footprinter standard curve, and confirming that the slag content detection result meets the requirement when the slag content detection result curves in the smelting furnace sampling confirmation, the holding furnace sampling confirmation and the sampling confirmation before filtering are positioned above the corresponding Prefil-Footprinter standard curve; the Prefil-Footprinter standard curve was determined experimentally.
Further, the filtration comprises plate filtration and tubular filtration which are sequentially carried out, wherein the tubular filtration is a final procedure of aluminum melt purification; newly change tubular filter need pass through earlier after 500 tons of other trade marks aluminium melt that do not contain magnesium, just can be used to the filtration of aluminum alloy jar material aluminium melt, set up the reason of this condition because: the aluminum alloy tank materials all contain magnesium (Mg), and the oxide of the magnesium (Mg) can affect the compactness of an oxidation film covered on the surface of the aluminum melt in the tubular filter, so that the aluminum melt can absorb hydrogen, oxygen and further oxidize from the atmosphere, and finally the ingot casting quality of the aluminum alloy tank materials is reduced; after 500 tons of aluminum melt without magnesium passes through the newly replaced tubular filter, a compact oxidation film is formed on the surface of the aluminum melt in the tubular filter, so that the condition is prevented; tubular filter can no longer be used in the filtration of aluminum alloy jar material aluminium melt after aluminium alloy jar material aluminium melt filtration capacity reaches 5000 tons, sets up the reason of this condition because: the aluminum alloy melt filtration is divided into surface filtration and internal filtration, and the tubular filtration belongs to surface and internal dual filtration; surface filtration means that solid impurities are mainly deposited on the surface of the filter medium; the internal filtration means that molten aluminum carries slag inclusions to flow along a tortuous channel and a gap in a filter medium; the water is collided with the hole wall and firmly adhered to the hole wall under the actions of direct interception, adsorption, precipitation and the like; along with the filtration, the effective filtration section of the pore passage is gradually reduced, the permeability is reduced, and the filtration precision is improved, but along with the increase of impurities in the filter medium, the liquid level difference of the inlet and the outlet of the pipe type is larger and larger, after reaching a certain degree, the impurities gathered in the channel of the filter medium can be intensively released and directly enter the product, so that the slag inclusion defect is caused, therefore, when reaching a certain throughput, the performance of the aluminum alloy tank material can be influenced, and the filtration capacity of the pipe type filter on the aluminum alloy tank material must be limited; for the tubular filter which is not suitable for filtering the aluminum alloy tank material aluminum melt, the tubular filter can still be used for filtering other aluminum alloy melts with lower requirements.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the invention discloses a production process for adding UBC (UBC-based scrap) to recycle waste in smelting of an aluminum alloy tank material, which comprises the steps of preparing materials, feeding/feeding aluminum, smelting in a smelting furnace, stirring, slagging off, sampling, alloying, refining in the smelting furnace, slagging off, sampling and confirming in a reverse furnace, quickly slagging off, sampling, adjusting components, refining in a holding furnace, slagging off, confirming in the holding furnace, standing, refining on-line grains, degassing and refining on-line, sampling and confirming before filtering, casting, inspecting finished products and carrying out saw milling, wherein 30-60% of UBC composite materials can be used in the feeding process; in the process, a floating solvent method refining process is adopted in smelting furnace smelting and holding furnace smelting, and slag content detection is added after the smelting furnace refining, holding furnace refining and on-line degassing refining processes to fully ensure that the content of slag inclusion and gas in an aluminum melt before filtering reaches the standard, so that the quality of smelting the aluminum alloy tank material adopting UBC composite material can meet the use requirement, and the UBC recovery value is improved, thereby solving the technical problem of smelting the aluminum alloy tank material by using the UBC composite material, greatly improving the UBC recovery value, reducing the production cost of the aluminum alloy tank material, and bringing good economic benefits to enterprises.
Drawings
FIG. 1 is a flow diagram of a process for adding UBC recycled scrap in the melting of aluminum alloy can stock;
FIG. 2 is a diagram of a Prefil-Footprinter standard curve;
FIG. 3 is a table showing the ratio of UBC regrind, self-produced scrap, and molten aluminum electrolysis charge for an example;
FIG. 4 is an example one alloying element composition control chart;
FIG. 5 is a table showing the ratios of materials of example two UBC compounds, self-produced scrap, and molten aluminum electrolysis;
FIG. 6 is an example secondary alloying element composition control chart;
FIG. 7 is a table showing the ratios of materials of example three UBC compounds, self-produced scrap, and molten aluminum electrolysis;
FIG. 8 is an example tri-alloy element composition control table.
Detailed Description
The present invention will be explained in detail by the following examples, which are disclosed for the purpose of protecting all technical improvements within the scope of the present invention.
A production process for adding UBC recycled waste in smelting of aluminum alloy tank materials comprises the steps of preparing materials, feeding/feeding aluminum, smelting in a smelting furnace, stirring, slagging-off, sampling, alloying, refining in the smelting furnace, slagging-off, sampling confirmation in the smelting furnace, reversing the furnace, rapidly slagging-off, sampling, adjusting components, refining in a holding furnace, slagging-off, sampling confirmation in the holding furnace, standing, online grain refinement, online degassing and refining, sampling confirmation before filtering, casting, finished product inspection and sawing and milling; wherein, the aluminum is electrolytic aluminum melting material, the feeding material is UBC compound material and self-production waste material, the mass percentage of the UBC compound material allowed to use (total aluminum melting mass) is 30-60%, the mass percentage of the self-production waste material allowed to use (total aluminum melting mass) is 10-70%, and the mass percentage of the electrolytic aluminum melting material allowed to use (total aluminum melting mass) is 0-60%; when the smelting furnace actually smelts, the actual mass ratio (total aluminum melt mass) of the UBC composite material, the self-produced waste material and the electrolytic aluminum melt material is determined by the following method: firstly, measuring the content of various alloying elements in a UBC complex material to be used, a self-produced waste material and an electrolytic aluminum melt material through spectral analysis, and making a production scheduling burdening table in advance by a burdening engineer according to the measured content of various alloying elements in the material to be used and the content of various alloying elements in an aluminum alloy tank material to be produced to ensure that various alloying elements in furnace burden (including the UBC complex material, the self-produced waste material and the electrolytic aluminum melt material) added into a smelting furnace do not exceed the upper limit value of various alloying elements of the aluminum alloy tank material to be produced;
during smelting, the UBC compound material and the self-produced waste are added into a smelting furnace for a plurality of times, and then the electrolytic aluminum melting material is added; when the temperature of the aluminum melt reaches above 720 ℃, taking a mother solution sample for component detection, calculating the mass of various intermediate alloys to be added according to the difference between the actual value of various alloying elements in the mother solution sample and the target value of various alloying elements of the aluminum alloy tank material to be produced, weighing, adding the intermediate alloys into the aluminum melt, fully heating and stirring, and then refining in a smelting furnace;
refining, degassing and deslagging by adopting a floating solvent method during refining and refining in a smelting furnace, and simultaneously adding argon and a refining agent into a molten aluminum melt, wherein the refining agent is a particle formed by mixing 43% of magnesium chloride (MgCl 2) and 57% of potassium chloride (KCl); the specific operation process conditions of refining, degassing and deslagging by a planktonic solvent method of smelting furnace refining are as follows:
s1.1, starting condition confirmation: melt temperature: 730-740 ℃; the alloying of the smelting furnace is finished; starting electromagnetic stirring;
s1.2, refining, degassing and deslagging by using a smelting furnace floating solvent: adding argon gas to the molten aluminum melt along with a refining agent via a hand-held refining tube inserted below the depth 2/3 of the molten aluminum melt; argon flow of 175 l/min and aeration time of 20 min; the dosage of the refining agent is 50 kg/one hundred tons of melt, and the refining agent is added into the molten aluminum melt at a constant speed along with argon within 15 minutes; in the process of refining, degassing and deslagging the floating solvent, the position of a refining point needs to be continuously moved so that the argon and the refining agent can be uniformly blended into the aluminum melt;
s1.3, after the refining agent is added into the molten aluminum melt, continuously maintaining pure argon for refining for 5 minutes; after sampling confirmation through the smelting furnace, immediately turning down the furnace;
refining in a holding furnace by adopting a floating solvent method to remove gas and slag, and simultaneously adding argon and a refining agent into a molten aluminum melt, wherein the refining agent is a granular mixture of 43% of magnesium chloride (MgCl 2) and 57% of potassium chloride (KCl); the specific operation process conditions of refining, degassing and deslagging by a floating solvent method of heat preservation furnace refining are as follows:
s2.1, starting condition confirmation: melt temperature: 720-730 ℃; adjusting the components of the holding furnace; starting electromagnetic stirring;
s2.2, refining, degassing and deslagging the heat preservation furnace by using a floating solvent: argon and a refining agent are added into the molten aluminum melt through the rotation and stirring of a graphite rotor arranged at the upper part of the holding furnace, and the depth of the graphite rotor inserted into the molten aluminum melt is 2/3; argon flow is 220 liters/minute, the dosage of a refining agent is 25 kilograms per hundred tons of melt, and the flow of the refining agent added into the molten aluminum melt is 2.0 kilograms per minute until all the refining agent is added along with the argon;
s2.3, after the refining agent is added into the molten aluminum melt, continuously introducing argon for refining for 5 minutes, and after sampling confirmation through a holding furnace, entering a standing process;
on-line degassing and refining, namely refining, degassing and deslagging by adopting a floating method, and adding a mixed gas of argon and chlorine into a molten aluminum melt, wherein the volume ratio of the argon to the chlorine is 200: 1; the mixed gas of argon and chlorine is added into the molten aluminum melt through the rotary stirring of a plurality of gas-filling rotors arranged at the bottom of the degassing tank;
the specific operation process conditions of the on-line degassing and refining flotation method for degassing and deslagging are as follows:
s3.1, starting condition confirmation: melt temperature: 700-720 ℃; on-line grain refinement has been performed; starting the gas-filling rotor to rotate;
s3.2, refining, degassing and deslagging by an online degassing and floating method: the mixed gas of argon and chlorine is added into the molten aluminum melt through the rotary stirring of a plurality of gas-filling rotors arranged at the bottom of the degassing tank; the flow rate of the mixture was 200 l/min; sampling confirmation before filtering is carried out after online degassing and refining, but the sampling confirmation before filtering does not carry out any treatment on the aluminum melt regardless of the result, and the sampling confirmation result before filtering is only used for the evaluation reference of the final ingot quality;
detecting the slag content by using a Prefil-Footprinter after sampling confirmation of a smelting furnace, sampling confirmation of a holding furnace and sampling confirmation before filtering; comparing the slag content detection result curves in the smelting furnace sampling confirmation, the holding furnace sampling confirmation and the sampling confirmation before filtering with the corresponding Prefil-Footprinter standard curve, and confirming that the slag content detection result meets the requirement when the slag content detection result curves in the smelting furnace sampling confirmation, the holding furnace sampling confirmation and the sampling confirmation before filtering are positioned above the corresponding Prefil-Footprinter standard curve; the Prefil-Footprinter standard curve is determined experimentally; supplementary notes are that: under the condition that the quality of the existing UBC compound material incoming material is poor, slag content detection is synchronously performed in the processes of smelting furnace sampling confirmation, holding furnace sampling confirmation and sampling confirmation before filtration besides the detection of all alloying components of an aluminum melt, but along with the gradual improvement of the quality of the UBC compound material incoming material, the slag content detection in the processes of smelting furnace sampling confirmation, holding furnace sampling confirmation and sampling confirmation before filtration can be gradually cancelled, so that the production cost of the aluminum alloy tank material is further reduced;
the filtration comprises plate filtration and tubular filtration which are sequentially carried out, wherein the tubular filtration is the final procedure of aluminum melt purification; the newly replaced tubular filter can be used for filtering aluminum melt of the aluminum alloy tank material after 500 tons of aluminum melt without magnesium in other brands pass through the tubular filter; the tubular filter can not be used for filtering the aluminum melt of the aluminum alloy tank material after the filtering capacity of the aluminum alloy tank material aluminum melt reaches 5000 tons.
The practical data in the practical production are used for explaining the charging mass ratio relation of the UBC compound material, the self-produced waste material and the electrolytic aluminum melting material and the control condition of each alloying element in the smelting of the aluminum alloy pot material as follows:
example one:
the yield of a first smelting furnace is 120 tons, and 3104 aluminum alloy tank body materials are produced; the content of various alloying elements in the UBC complex material, the self-produced waste material and the electrolytic aluminum melt material to be used is measured through spectral analysis, and a batching plan batching table is prepared by a batching engineer according to the measured content of various alloying elements in the UBC complex material, the self-produced waste material and the electrolytic aluminum melt material and the content of various alloying elements in the 3104 aluminum alloy tank material to be produced as follows: 55.6 tons of UBC compound material with the mass ratio of 46 percent; 39 tons of self-production waste materials are 32.3 percent by mass; 26.2 tons of electrolytic aluminum melt with the mass ratio of 21.7 percent; when furnace burden is melted to above 720 ℃, taking mother liquor for detection, and calculating the mass of various intermediate alloys required to be added according to the difference between the actual value of various alloying elements in a mother liquor sample and the target value of various alloying elements of the aluminum alloy tank material to be produced as follows: 160Kg of AlSi20 intermediate alloy, 260Kg of AlFe20 intermediate alloy, 70Kg of AlCu50 intermediate alloy, 400Kg of AlMn20 intermediate alloy and 280Kg of Mg ingot; after smelting furnace refining, holding furnace refining and online degassing refining, sampling before filtering to confirm that the content of all alloying elements meets the requirements; the specific data refer to the attached figures 3 and 4 in the specification.
Example two:
the yield of a first smelting furnace is 100 tons, and 3104 aluminum alloy tank body materials are produced; the contents of various alloying elements in UBC composite materials, self-produced waste materials and electrolytic aluminum melting materials to be used are measured through spectral analysis, and a production scheduling batching table is prepared by batching engineers according to the measured contents of various alloying elements in UBC composite materials, self-produced waste materials and electrolytic aluminum melting materials and the contents of various alloying elements in 3104 aluminum alloy tank materials to be produced: 57.7 tons of UBC compound material with the mass ratio of 57.8 percent; 11 tons of self-production waste materials account for 11 percent by mass; 31.2 tons of electrolytic aluminum melt with the mass ratio of 31.2 percent; when furnace burden is melted to above 720 ℃, taking mother liquor for detection, and calculating the mass of various intermediate alloys required to be added according to the difference between the actual value of various alloying elements in a mother liquor sample and the target value of various alloying elements of the aluminum alloy tank material to be produced as follows: 250Kg of AlSi20 intermediate alloy, 350Kg of AlFe20 intermediate alloy, 55Kg of AlCu50 intermediate alloy, 300Kg of AlMn20 intermediate alloy and 350Kg of Mg ingot; after smelting furnace refining, holding furnace refining and online degassing refining, sampling before filtering to confirm that the content of all alloying elements meets the requirements; the specific data refer to the specification, namely, figure 5 and figure 6.
Example three:
the yield of a first smelting furnace is 110 tons, and 3104 aluminum alloy tank body materials are produced; the content of various alloying elements in the UBC complex material, the self-produced waste material and the electrolytic aluminum melt material to be used is measured through spectral analysis, and a batching plan batching table is prepared by a batching engineer according to the measured content of various alloying elements in the UBC complex material, the self-produced waste material and the electrolytic aluminum melt material and the content of various alloying elements in the 3104 aluminum alloy tank material to be produced as follows: 35.2 tons of UBC compound material with the mass ratio of 30.4 percent; 75 tons of self-production waste is 64.8 percent by mass; 5.5 tons of electrolytic aluminum melt with the mass ratio of 4.8 percent; when furnace burden is melted to above 720 ℃, taking mother liquor for detection, and calculating the mass of various intermediate alloys required to be added according to the difference between the actual value of various alloying elements in a mother liquor sample and the target value of various alloying elements of the aluminum alloy tank material to be produced as follows: 30Kg of AlSi20 intermediate alloy, 0Kg of AlFe20 intermediate alloy, 150Kg of AlCu50 intermediate alloy, 0Kg of AlMn20 intermediate alloy and 0Kg of Mg ingot; after smelting furnace refining, holding furnace refining and online degassing refining, sampling before filtering to confirm that the content of all alloying elements meets the requirements; the specific data refer to the specification, namely figure 7 and figure 8.
The present invention is not described in detail in the prior art.
Claims (7)
1. A production process for adding UBC recycled waste in smelting of aluminum alloy tank materials comprises the steps of preparing materials, feeding/feeding aluminum, smelting in a smelting furnace, stirring, slagging-off, sampling, alloying, refining in the smelting furnace, slagging-off, sampling confirmation in the smelting furnace, reversing the furnace, rapidly slagging-off, sampling, adjusting components, refining in a holding furnace, slagging-off, sampling confirmation in the holding furnace, standing, online grain refinement, online degassing and refining, sampling confirmation before filtering, casting, finished product inspection and sawing and milling; it is characterized in that: UBC composite material and self-produced waste material are used for feeding, and electrolytic aluminum melting material is used for feeding aluminum; the allowable mass ratio (total aluminum melt mass) of the UBC compound material is 30-60%, the allowable mass ratio (total aluminum melt mass) of the self-production waste material is 10-70%, and the allowable mass ratio (total aluminum melt mass) of the electrolytic aluminum melt material is 0-60%; in the refining of a smelting furnace and the refining of a heat preservation furnace, a floating solvent method is adopted for refining, degassing and deslagging; in the online degassing and refining, a floating method is adopted for refining, degassing and deslagging.
2. The process for producing the UBC recycled scrap added in the melting of the aluminum alloy can material as claimed in claim 1, wherein the process comprises the following steps: in the sampling confirmation of the smelting furnace and the sampling confirmation of the holding furnace, the next procedure can be carried out only after the slag content detection and the component detection are carried out.
3. The process of claim 1 for producing UBC recycled scrap added in the melting of aluminum alloy can stock, which is characterized by comprising the following steps: refining, degassing and deslagging by a smelting furnace refining floating solvent method, and simultaneously adding argon and a refining agent into a molten aluminum melt, wherein the refining agent is a particle formed by mixing 43% of magnesium chloride (MgCl 2) and 57% of potassium chloride (KCl); the specific operation process conditions of refining, degassing and deslagging by a planktonic solvent method of smelting furnace refining are as follows:
s1.1, starting condition confirmation: melt temperature: 720-750 ℃; the alloying of the smelting furnace is finished; starting electromagnetic stirring;
s1.2, refining, degassing and deslagging by using a floating solvent: argon gas is added to the molten aluminum melt along with a refining agent by holding a refining tube that is inserted below the depth 2/3 of the molten aluminum melt; the argon flow is 150-175L/min, and the aeration time is 20-25 min; the dosage of the refining agent is 50 kg/one hundred tons of melt, and the refining agent is added into the molten aluminum melt at a constant speed along with argon within 15-20 minutes; in the process of refining, degassing and deslagging the floating solvent, the position of a refining point needs to be continuously moved;
and S1.3, after the refining agent is added into the molten aluminum melt, continuously maintaining pure argon for refining for more than 5 minutes.
4. The process of claim 1 for producing UBC recycled scrap added in the melting of aluminum alloy can stock, which is characterized by comprising the following steps: refining, degassing and deslagging by a floating solvent method of heat preservation furnace refining, adding argon and a refining agent into a molten aluminum melt, wherein the refining agent is a particulate matter formed by mixing 43% of magnesium chloride (MgCl 2) and 57% of potassium chloride (KCl); the specific operation process conditions of refining, degassing and deslagging by a floating solvent method of heat preservation furnace refining are as follows:
s2.1, starting condition confirmation: melt temperature: 720-730 ℃; adjusting the components of the holding furnace; starting electromagnetic stirring;
s2.2, refining, degassing and deslagging by using a floating solvent: argon and a refining agent are added into the molten aluminum melt through the rotation and stirring of a graphite rotor arranged at the upper part of the holding furnace, and the depth of the graphite rotor inserted into the molten aluminum melt is 2/3; argon flow is 220 liters/minute, the dosage of a refining agent is 25 kilograms per hundred tons of melt, and the flow of the refining agent added into the molten aluminum melt is 0.5-2.5 kilograms per minute until all the refining agent is added along with the argon mixed gas;
s2.3, after the refining agent is added into the molten aluminum melt, continuously introducing argon to refine for more than 5 minutes.
5. The process of claim 1 for producing UBC recycled scrap added in the melting of aluminum alloy can stock, which is characterized by comprising the following steps: refining, degassing and deslagging by a floating method of online degassing and refining, wherein a mixed gas of argon and chlorine is added into a molten aluminum melt, wherein the volume ratio of the argon to the chlorine is 200: 1; the mixed gas of argon and chlorine is added into the molten aluminum melt through the rotary stirring of a plurality of gas-filling rotors arranged at the bottom of the degassing tank; the specific operation process conditions of the on-line degassing and refining flotation method for degassing and deslagging are as follows:
s3.1, starting condition confirmation: melt temperature: 700-720 ℃; on-line grain refinement has been performed; opening an air-entrapping rotor at the bottom of the degassing tank to rotate;
s3.2, refining, degassing and deslagging by a floating method: the mixed gas of argon and chlorine is added into the molten aluminum melt by rotating and stirring through a plurality of gas-filling rotors at the bottom of the degassing tank; the flow rate of the mixed gas is 175-200L/min.
6. The process of claim 1 for producing UBC recycled scrap added in the melting of aluminum alloy can stock, which is characterized by comprising the following steps: detecting the slag content by using a Prefil-Footprinter; comparing the slag content detection result curves in the smelting furnace sampling confirmation, the holding furnace sampling confirmation and the sampling confirmation before filtering with the corresponding Prefil-Footprinter standard curve, and confirming that the slag content detection result meets the requirement when the slag content detection result curves in the smelting furnace sampling confirmation, the holding furnace sampling confirmation and the sampling confirmation before filtering are positioned above the corresponding Prefil-Footprinter standard curve; the Prefil-Footprinter standard curve was determined experimentally.
7. The process of claim 1 for producing UBC recycled scrap added in the melting of aluminum alloy can stock, which is characterized by comprising the following steps: the filtration comprises plate filtration and tubular filtration which are sequentially carried out, wherein the tubular filtration is a final procedure of aluminum melt purification; when the tubular filter is replaced newly, 500 tons of aluminum melt without magnesium and other brands need to be filtered, and then the tubular filter can be used for filtering the aluminum melt of the aluminum alloy tank material; the tubular filter can not be used for filtering the aluminum melt of the aluminum alloy tank material after the filtering capacity of the aluminum alloy tank material aluminum melt reaches 5000 tons.
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| CN115976352A (en) * | 2023-02-14 | 2023-04-18 | 湖南中创空天新材料股份有限公司 | Method for preparing wrought aluminum alloy by utilizing recycled aluminum |
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