Online purification method for high-performance aluminum alloy production

Abstract

The invention discloses an online purification method for high-performance aluminum alloy production, and relates to the technical field of aluminum alloy purification. By collecting and analyzing the types of impurities of the waste aluminum and the information such as the corresponding content, granularity and density, the characteristics of the waste aluminum at each detection point can be accurately known, and the melting point promotion value and the bubble promotion value of each detection point are obtained according to the characteristics; detailed characteristic parameters of the waste aluminum can be obtained before smelting; the smelting temperature is regulated and controlled according to the melting point characteristic value, it is ensured that waste aluminum is melted at the proper temperature, then the melting state is analyzed in real time according to a melting picture, whether smelting is completed or not is judged according to the melting state, and automatic smelting process control is achieved; the flow of inert gas is regulated and controlled through bubble characteristic values, the atmosphere in the smelting furnace is effectively controlled, and the waste aluminum purification effect and the product quality are guaranteed; and the gas purification condition is monitored according to the outlet concentration of the gas outlet monitored in real time, so that whether purification is completed or not is judged, and the efficiency and thoroughness of waste aluminum gas purification are improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy purification, and in particular to an online purification method for high-performance aluminum alloy production. Background Art

[0002] Aluminum is a recyclable metal. By recycling scrap aluminum for reuse, the mining volume of original aluminum ore resources can be effectively saved. Therefore, many aluminum alloy manufacturers choose to use second-hand recycled scrap aluminum. When scrap aluminum is exposed to the air for a long time, aluminum oxide (Al2O3) or other impurities will form on the surface. This oxide will adhere to the surface of the scrap aluminum, affecting the recycling of aluminum and the purity requirements in the alloy manufacturing process. Therefore, for the use of second-hand recycled scrap aluminum for aluminum alloy manufacturing, its purification is particularly important;

[0003] When high-performance aluminum alloys are manufactured from recycled scrap aluminum, smelting and gas purification are usually used to treat impurities in the scrap aluminum, especially aluminum oxide. However, during the smelting purification and gas purification processes, the purification process is usually controlled by manually set purification conditions. Traditional purification methods have limitations and rely more on set fixed parameters to control the smelting purification and gas purification processes. It is difficult to adjust in real time to cope with scrap aluminum of different qualities or sources. Summary of the invention

[0004] Based on this, it is necessary to provide an online purification method for high-performance aluminum alloy production in response to the problems mentioned in the above background technology.

[0005] The purpose of the present invention can be achieved by the following technical solution: An online purification method for high-performance aluminum alloy production comprises the following steps:

[0006] Step 1: Collect scrap aluminum information, including the types of impurities and the corresponding content, particle size, and density of each impurity, and save them;

[0007] Step 2: Analyze the scrap aluminum characteristics based on the scrap aluminum information in the preparation area to obtain scrap aluminum characteristic parameters, where the scrap aluminum characteristic parameters include melting point characteristic values ​​and gas characteristic values, and send them to Step 3 and Step 4 respectively;

[0008] Step 3: Based on the melting point characteristic value of the preparation area, the smelting purification of the scrap aluminum is regulated and controlled, and the degree of smelting during the smelting process is monitored to determine whether the smelting is complete; if the smelting is complete, the temperature is lowered until the temperature drops to a safe temperature, and Step 4 is executed;

[0009] Step 4: Based on the gas characteristic values ​​of the preparation area, the waste aluminum gas purification process is regulated and controlled, and the purification degree of the purification process is monitored to determine whether the purification is complete; specifically:

[0010] The amount of scrap aluminum put into the furnace and the gas characteristic value TA are calculated by the set formula GF = g1 × Fa + g2 × TA to obtain the purification flow rate GF, where g1 and g2 are the set proportional coefficients respectively;

[0011] It is assumed that there is an air inlet and an air outlet in the furnace, and inert gas is passed into the furnace through the air inlet according to the purification flow rate. A gas monitor is installed at the air outlet, and a gas detector is set to detect the target gas type at the outlet and the corresponding concentration of each target gas at a certain interval; the concentration of each target gas is summed and calculated to obtain the outlet concentration; thus, the outlet concentration corresponding to each collection time can be obtained;

[0012] With time as the horizontal axis and outlet concentration as the horizontal axis, the outlet concentration is input into the outlet concentration versus time curve in the coordinate axis according to its corresponding collection time; a tangent line is drawn at the concentration point, and the slope of the tangent line is calculated and recorded as the purification slope; when the outlet concentration is less than the set concentration threshold, the corresponding concentration point is recorded as the preliminary purification point; the purification slope of the preliminary purification point is extracted, and when the purification slope is equal to zero, the preliminary purification point is recorded as a multiple-step purification point, and it is marked in the curve chart; when there are a fixed number of consecutive multiple-step purification points, the online purification of high-performance aluminum alloy manufacturing has been completed;

[0013] Step 5: Repeat Step 2-Step 4 to control the smelting and gas purification of a new batch of scrap aluminum in the preparation area.

[0014] In some embodiments, the specific process of analyzing the characteristics of scrap aluminum based on the scrap aluminum information in the material preparation area is as follows:

[0015] 201: several detection points are set in the material preparation area, and scrap aluminum information is obtained at each detection point, wherein the scrap aluminum information includes impurity types and the content, particle size and density corresponding to each impurity type; any one of the detection points is selected, and the impurity types contained in the scrap aluminum at the detection point are classified into melting point impurities and gas impurities;

[0016] 202: Compare the melting point impurity with all the set melting point impurities to match the corresponding action coefficient, normalize the content and action coefficient corresponding to the melting point impurity, take their values, multiply the values ​​to obtain the action value of the melting point impurity; sum the action values ​​corresponding to each melting point impurity to obtain the melting point action value recorded as C1, and calculate it with the particle size C2 and the density C3 through the set formula Ca=log2(a1×e C1 +a2×e C2 +a3×e C3 +1) to calculate the melting point promotion value Ca, wherein a1, a2, and a3 are respectively set proportional coefficients, and the specific values ​​are set by those skilled in the art according to actual needs;

[0017] 203: Compare the gas impurity with all set gas impurities to match the corresponding bubble coefficient, normalize the content and bubble coefficient corresponding to the gas impurity and take the numerical value, multiply the numerical value to obtain the bubble value of the gas impurity; sum the bubble values ​​of each gas impurity to obtain the bubble promotion value;

[0018] 204: Thus, the melting point promotion value and the bubble promotion value at each detection point can be obtained, and the melting point promotion value and the bubble promotion value are compared and analyzed to obtain the melting promotion coefficient and the gas promotion coefficient;

[0019] 205: The melting point promotion value Cai, the bubble promotion value Aai, the melting promotion coefficient Bα and the gas promotion coefficient Bβ at each detection point are combined by the set formula The melting point characteristic value TC and the gas characteristic value TA are calculated, wherein λ1 and λ2 are set correction factors, respectively, and the values ​​thereof are set by technicians in this field according to actual needs.

[0020] In some embodiments, the specific process of comparing and analyzing the melting point promotion value and the bubble promotion value is as follows:

[0021] The melting point promotion value is compared with the set melting point range to divide the detection points corresponding to the melting point promotion value into high melting point, medium melting point and low melting point, and the number of high melting point, medium melting point and low melting point in the preparation area is counted respectively, and recorded as B1, B2 and B3 respectively; using the set formula The melting promotion coefficient Bα is calculated, where d1, d2, and d3 are respectively set proportional coefficients, and d1>d2>d3>0;

[0022] Similarly, the bubble promotion value is compared with the set bubble interval to divide the detection points corresponding to the bubble promotion value into high-promotion points, medium-promotion points and low-promotion points. The number of high-promotion points, medium-promotion points and low-promotion points is counted respectively and recorded as B4, B5 and B6 respectively. The set formula is used The shortness of breath coefficient Bα is calculated, where d4, d5, and d6 are set proportional coefficients, and d4>d5>d6>0.

[0023] In some embodiments, the specific process of regulating the smelting and purification of scrap aluminum based on the melting point characteristic value of the preparation zone is:

[0024] After the furnace is preheated to the set temperature, the scrap aluminum in the preparation area is transported to the smelting furnace through the feed hopper. The amount of scrap aluminum put into the furnace is calculated as Fa, and the melting temperature RF is obtained by calculating it with the melting point characteristic value TC through the set formula RF=r1×Fa+r2×TC, where r1 and r2 are the set proportional coefficients respectively.

[0025] In some embodiments, the degree of smelting during the smelting process is monitored to determine whether the smelting is complete, as follows:

[0026] When the temperature in the boiler rises to the smelting temperature, the smelting photos in the furnace are obtained at intervals, thereby obtaining the smelting photos corresponding to each acquisition time; the smelting photos corresponding to a certain acquisition time are randomly selected, and are enlarged to form a number of pixel grids, and each color is set to correspond to a color value, and the color value and brightness corresponding to the pixel grid are identified, and are recorded as Yj and Hj respectively; wherein j = 1, 2, 3 ... J, J is a positive integer, J represents the total number of pixel grids, and j represents the serial number of any pixel grid; by setting the formula The melting state value YHj is calculated, where n1 and n2 are the set proportional coefficients. is the color mean of each pixel; is the average brightness of each pixel; thus, the melting state value corresponding to each acquisition moment is recorded as YHq, where q=1, 2, 3...Q, Q is a positive integer, Q represents the total number of acquisition moments, and q represents the sequence number of any acquisition moment;

[0027] With time as the horizontal axis and the melting state value as the vertical axis, a curve graph of the melting state value changing with time is obtained; a tangent line is drawn at each state point, and the slope of each tangent line is calculated and recorded as the melting slope; when the melting state value is less than the set melting threshold, the corresponding state point is recorded as the initial melting point; the slope of the initial melting point is extracted, and when the melting slope is equal to zero, the initial melting point is recorded as the compound melting point, and it is marked in the curve graph; when there are a fixed number of consecutive compound melting points, the melting step of the scrap aluminum has been completed, and the cooling operation is performed. When the temperature drops to a safe temperature, Step 4 is executed;

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. By collecting and analyzing the types of impurities in scrap aluminum and their corresponding content, particle size, density and other information, the characteristics of scrap aluminum at each detection point can be accurately understood, and the melting point promotion value and bubble promotion value of each detection point can be obtained accordingly; the detailed characteristic parameters of scrap aluminum can be obtained before smelting, thereby providing data support for more accurate smelting and gas purification;

[0030] 2. By adjusting the melting temperature based on the melting point characteristic value, the scrap aluminum is ensured to melt at an appropriate temperature, thus improving the melting efficiency and product quality. The melting state is analyzed in real time based on the melting picture, and it is judged whether the melting is completed accordingly, so as to avoid the subsequent process and product quality being affected by incomplete melting, realize the automatic melting process control, reduce human intervention, and improve production efficiency and consistency.

[0031] 3. The flow rate of inert gas is regulated by the bubble characteristic value to effectively control the atmosphere in the furnace and ensure the scrap aluminum purification effect and product quality; the outlet concentration at the gas outlet is monitored in real time to monitor the gas purification situation and determine whether the purification is completed, so as to improve the efficiency and thoroughness of scrap aluminum gas purification;

[0032] In summary, the present invention adjusts the smelting temperature and gas flow rate according to the characteristics of specific scrap aluminum to adapt to the actual conditions of different scrap aluminums, thereby improving the efficiency and quality of scrap aluminum smelting and purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a principle block diagram of the present invention. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0036] like Figure 1 As shown, an online purification method for high-performance aluminum alloy production comprises the following steps:

[0037] Step 1: Collect scrap aluminum information, including the types of impurities and the corresponding content, particle size, and density of each impurity, and save them; set up a preparation area, which is the scrap aluminum ready to be put into the furnace for smelting;

[0038] Sep2: Based on the scrap aluminum information in the material preparation area, the scrap aluminum characteristics are analyzed to obtain scrap aluminum characteristic parameters, where the scrap aluminum characteristic parameters include melting point characteristic values ​​and gas characteristic values; specifically:

[0039] Several detection points are set up in the material preparation area to obtain scrap aluminum information at each detection point, wherein the scrap aluminum information includes the types of impurities and the corresponding content, particle size and density of each type of impurity; it should be noted that finer scrap aluminum particles have a larger surface area and can contact the smelting medium (such as molten aluminum or aluminum alloy) more quickly, shortening the smelting time. High-density scrap aluminum needs to overcome greater inertia and heat conduction resistance when melting, which will lead to a longer melting time;

[0040] Take any one of the detection points and classify the impurities contained in the scrap aluminum at the detection point into melting point impurities and gas impurities; the melting point impurities include oxides, sulfides and borides, etc., which will increase the melting point of the scrap aluminum, so a higher smelting temperature is required to completely melt it; gas impurities are specifically nitrides, carbides, etc. These elements will form gaseous compounds (nitrogen, carbon monoxide, etc.) during the smelting process, so inert gas is also needed to prompt them to be quickly discharged from the furnace;

[0041] Each type of melting point impurity is set to correspond to an action coefficient. It should be noted that different types of impurities have different effects on improving the melting point. For example, the impurity that has the most significant effect on improving the melting point is boride. Compared with other impurities, the corresponding action coefficient of boride is larger; the melting point impurity is compared with all the set melting point impurities to match the corresponding action coefficient, and the content and action coefficient corresponding to the melting point impurity are normalized, and their values ​​are taken, and the values ​​are multiplied to calculate the action value of the melting point impurity; the action values ​​corresponding to each melting point impurity are summed to obtain the melting point action value recorded as C1, and it is combined with the particle size C2 and the density C3 through the set formula Ca=log2(a1×e C1 +a2×e C2 +a3×e C3 +1) to calculate the melting point promotion value Ca, wherein a1, a2, and a3 are respectively set proportional coefficients, and the specific values ​​are set by those skilled in the art according to actual needs;

[0042] A bubble coefficient is set for each type of gas impurity. It should be noted that different gas impurities have different abilities to generate bubbles. For example, in the smelting process of aluminum, carbides (such as aluminum carbide) usually generate more and larger bubbles. This is because carbides decompose at high temperatures to release carbon gas, which will form larger bubbles and may accumulate inside the furnace, affecting the process and the quality of the finished product. In this case, a larger inert gas flow rate is required to take away the gas generated by it; the gas impurities are compared with all the set gas impurities to match the corresponding bubble coefficient, and the corresponding content and bubble coefficient of the gas impurities are normalized and their values ​​are taken, and the values ​​are multiplied to obtain the bubble value of the gas impurity; the bubble values ​​of each gas impurity are summed to obtain the bubble promotion value, which is recorded as Aa;

[0043] Thus, the melting point promotion value and bubble promotion value at each detection point can be obtained, and they are recorded as Cai and Aai respectively, where i = 1, 2, 3...I, I is a positive integer, and I represents the total number of detection points in the preparation area. i represents the serial number of any detection point; the melting point promotion value is compared and analyzed with the set melting point interval. When the melting point promotion value is greater than the set upper limit of the melting point interval, a high melting point is accumulated; when the melting point promotion value is in the set melting point interval, a medium melting point is accumulated; when the melting point promotion value is less than the set lower limit of the melting point interval, a low melting point is accumulated; the number of high melting points, medium melting points and low melting points in the preparation area is counted respectively, and they are recorded as B1, B2, B3 respectively; using the set formula The melting promotion coefficient Bα is calculated, where d1, d2, and d3 are respectively set proportional coefficients, and d1>d2>d3>0;

[0044] Similarly, the bubble promotion value is compared with the set bubble interval for analysis. When the bubble promotion value is greater than the set upper limit of the bubble interval, a high promotion point is accumulated; when the bubble promotion value is in the set bubble interval, a medium promotion point is accumulated; when the bubble promotion value is less than the set lower limit of the bubble interval, a low promotion point is accumulated; the number of high promotion points, medium promotion points and low promotion points is counted respectively, and they are recorded as B4, B5 and B6 respectively, and the set formula is used. The shortness of breath coefficient Bα is calculated, where d4, d5, and d6 are respectively set proportional coefficients, and d4>d5>d6>0;

[0045] The melting point promotion value Cai, bubble promotion value Aai, melting promotion coefficient Bα and gas promotion coefficient Bβ at each detection point are combined by the set formula The melting point characteristic value TC and the gas characteristic value TA are calculated, wherein λ1 and λ2 are set correction factors, and the values ​​are set by technicians in this field according to actual needs;

[0046] Send the melting point characteristic value TC to Step 4, and send the gas characteristic value TB to Step 5;

[0047] By collecting and analyzing the types of impurities in scrap aluminum and their corresponding content, particle size, density and other information, the characteristics of the scrap aluminum at each detection point can be accurately understood, and the melting point promotion value and bubble promotion value of each detection point can be obtained accordingly; the detailed characteristic parameters of the scrap aluminum can be obtained before and during smelting, thereby providing data support for more accurate smelting and gas purification.

[0048] Step 3: Based on the melting point characteristic value of the preparation area, the smelting purification of the scrap aluminum is regulated and controlled, and the degree of smelting during the smelting process is monitored to determine whether the smelting is complete; specifically:

[0049] After the furnace is preheated to the set temperature (the preheating temperature is set by the technicians in this field), the scrap aluminum in the preparation area is transported to the smelting furnace through the feed hopper, and the amount of scrap aluminum put into the smelting furnace is calculated as Fa, and the amount is calculated with the melting point characteristic value TC through the set formula RF = r1 × Fa + r2 × TC to obtain the smelting temperature RF, wherein r1 and r2 are respectively the set proportional coefficients; it can be seen from the formula that the larger the amount of scrap aluminum, the more heat is needed to melt it, and the smelting temperature increases; when there are more melting point impurities in the scrap aluminum, the greater the promoting effect on the melting point, and the smelting temperature increases;

[0050] When the temperature in the boiler rises to the smelting temperature, the smelting photos in the furnace are obtained at a certain interval; (the certain time length is set by the technicians in this field according to actual needs, and can be 1min, 2min, 3min, etc.); arbitrarily select the smelting photos corresponding to a certain acquisition time, and amplify them to form a number of pixel grids, set each color to correspond to a color value, identify the color value and brightness corresponding to the pixel grid, and record them as Yj and Hj respectively; wherein j = 1, 2, 3...J, J is a positive integer, J represents the total number of pixel grids, and j represents the sequence number of any pixel grid; it should be noted that the completely molten aluminum liquid usually presents a uniform color and a smooth surface, while the incompletely dissolved part may present uneven color, uniform brightness or solidified aluminum blocks on the surface;

[0051] Using the set formula The melting state value YHj is calculated, where n1 and n2 are the set proportional coefficients. is the color mean of each pixel; is the average brightness of each pixel; thus, the melting state value corresponding to each acquisition moment is recorded as YHq, where q=1, 2, 3...Q, Q is a positive integer, Q represents the total number of acquisition moments, and q represents the sequence number of any acquisition moment; from the formula, it can be seen that when the difference between the color value and brightness of each pixel grid in the smelting image corresponding to the same acquisition moment is greater and more uneven, it means that the scrap aluminum is not completely melted, and the melting state value is greater;

[0052] A two-dimensional rectangular coordinate system is constructed with time as the horizontal coordinate and the melting state value as the vertical coordinate, the melting state value is input into the coordinate axis according to its corresponding collection time, and the position of the melting state value in the coordinate axis is recorded as the state point, and a smooth curve is used to connect the state points in sequence to obtain a melting state value versus time curve; a tangent line of the curve is drawn at each state point, and the slope of each tangent line is calculated and recorded as the melting slope; when the melting slope is greater than zero, it means that at this state point, the melting state value shows an increasing trend, indicating that the scrap aluminum is not completely melted; when the melting slope is less than zero, it means that at this state point, the melting state value shows a decreasing trend, indicating that the scrap aluminum is in the melting process; the melting state value corresponding to each state point is compared and analyzed with the set melting threshold value, and when the melting state value is less than the set melting threshold value, it means that the melting state of the scrap aluminum at this time is better and the trend is good. If the aluminum scrap is nearly completely melted, the corresponding state point is recorded as the initial melting point; the slope of the initial melting point is extracted, and when the melting slope is equal to zero, the initial melting point is recorded as the compound melting point, and it is marked in the curve chart; when there are a fixed number of consecutive compound melting points (the fixed number is set by technicians in this field according to actual conditions, and can be 3, 4, 5, etc.), the melting step of the scrap aluminum has been completed, and the cooling operation is performed. When the temperature drops to a safe temperature, Step 4 is executed; it should be noted that the melting temperature is lowered to a safe temperature in order to reduce the generation of harmful gases generated at high temperatures and create a safe operating environment for subsequent gas purification operations; the role of the inert gas is to replace the atmosphere in the furnace with a non-reactive gas, thereby preventing oxidation and other chemical reactions;

[0053] By regulating the smelting temperature based on the melting point characteristic value, we can ensure that the scrap aluminum melts at an appropriate temperature, improve the smelting efficiency and product quality, and then analyze the melting state in real time based on the smelting picture to determine whether the smelting is completed, so as to avoid affecting the subsequent process and product quality due to incomplete melting, realize automated smelting process control, reduce human intervention, and improve production efficiency and consistency.

[0054] Step 4: Based on the gas characteristic values ​​of the preparation area, the waste aluminum gas purification process is regulated and controlled, and the purification degree of the purification process is monitored to determine whether the purification is complete; specifically:

[0055] The amount of scrap aluminum put into the furnace and the gas characteristic value TA are calculated by the set formula GF=g1×Fa+g2×TA to obtain the purification flow rate GF, where g1 and g2 are the set proportional coefficients respectively; it can be seen from the formula that the more scrap aluminum there is, the more active the atmosphere in the furnace will be. Since the oxidation reaction of scrap aluminum consumes a lot of oxygen, it is necessary to increase the flow rate of inert gas accordingly to maintain a stable atmosphere, and the flow rate of inert gas increases; when the gas characteristic value is larger, it means that there are more gas impurities, and more interfering gases will be generated, and it is necessary to increase the flow rate of inert gas accordingly to prompt it to be quickly discharged from the furnace;

[0056] It is assumed that there is an air inlet and an air outlet in the furnace, and inert gas is passed into the furnace through the air inlet according to the purification flow rate. A gas monitor is installed at the air outlet, and a gas detector is set at a certain interval to detect the target gas type at the outlet and the corresponding concentration of each target gas; the target gas type corresponds to the gas impurity. When the gas impurity is nitride or carbide, the corresponding target gas type is nitrogen, carbon monoxide and carbon dioxide; the concentration of each target gas is summed up and calculated to obtain the outlet concentration; thus, the outlet concentration corresponding to each collection time can be obtained; with time as the horizontal axis and the outlet concentration as the horizontal axis, the outlet concentration is input into the coordinate axis according to its corresponding collection time, and the position of the outlet concentration in the coordinate axis is recorded as the concentration point, and a smooth curve is used to connect the concentration points in sequence to obtain a curve graph of the outlet concentration changing with time; a tangent line is drawn at the concentration point, and the slope of the tangent line is calculated and recorded as the purification slope; When the purification slope is greater than zero, it means that at this concentration point, the outlet concentration shows an increasing trend, indicating that the target gas is not completely removed; when the purification slope is less than zero, it means that at this concentration point, the outlet concentration shows a decreasing trend, indicating that the scrap aluminum is in the process of removing the target gas; the outlet concentration corresponding to each concentration point is compared and analyzed with the set concentration threshold value. When the outlet concentration is less than the set concentration threshold value, it means that the purification effect of the target gas at this time is better and close to complete purification, and the corresponding concentration point is recorded as a preliminary purification point; the purification slope of the preliminary purification point is extracted. When the purification slope is equal to zero, the preliminary purification point is recorded as a compound purification point and marked in the curve chart; when there are a fixed number of continuous compound purification points (the fixed number is set by technicians in this field according to actual conditions, and can be 3, 4, 5, etc.), the online purification of high-performance aluminum alloy manufacturing has been completed;

[0057] By regulating the flow rate of inert gas through the bubble characteristic value, the atmosphere in the furnace is effectively controlled to ensure the scrap aluminum purification effect and product quality; then the outlet concentration at the gas outlet is monitored in real time to monitor the gas purification situation to determine whether the purification is completed, so as to improve the efficiency and thoroughness of scrap aluminum gas purification.

[0058] Step 5: Repeat Step 2-Step 4 to control the smelting and gas purification of a new batch of scrap aluminum in the preparation area.

[0059] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An online purification method for high-performance aluminum alloy production, characterized in that: The following steps are involved: Step 1: Collect scrap aluminum information, including the types of impurities and the corresponding content, particle size, and density of each impurity, and save them; Step 2: Analyze the scrap aluminum characteristics based on the scrap aluminum information in the preparation area to obtain scrap aluminum characteristic parameters, where the scrap aluminum characteristic parameters include melting point characteristic values ​​and gas characteristic values, and send them to Step 3 and Step 4 respectively; Step 3: Based on the melting point characteristic value of the preparation area, the smelting purification of the scrap aluminum is regulated and controlled, and the degree of smelting during the smelting process is monitored to determine whether the smelting is complete; if the smelting is complete, the temperature is lowered until the temperature drops to a safe temperature, and Step 4 is executed; Step 4: Based on the gas characteristic values ​​of the preparation area, the waste aluminum gas purification process is regulated and controlled, and the purification degree of the purification process is monitored to determine whether the purification is complete; specifically: The amount of scrap aluminum put into the furnace and the gas characteristic value are normalized and taken into account, and the purification flow rate is obtained by numerical analysis; It is assumed that there is an air inlet and an air outlet in the furnace, and inert gas is passed into the furnace through the air inlet according to the purification flow rate. A gas monitor is installed at the air outlet, and a gas detector is set to detect the target gas type at the outlet and the corresponding concentration of each target gas at a certain interval; the concentration of each target gas is summed and calculated to obtain the outlet concentration; thus, the outlet concentration corresponding to each collection time can be obtained; With time as the horizontal axis and outlet concentration as the horizontal axis, the outlet concentration is input into the outlet concentration versus time curve in the coordinate axis according to its corresponding collection time; a tangent line is drawn at the concentration point, and the slope of the tangent line is calculated and recorded as the purification slope; when the outlet concentration is less than the set concentration threshold, the corresponding concentration point is recorded as the preliminary purification point; the purification slope of the preliminary purification point is extracted, and when the purification slope is equal to zero, the preliminary purification point is recorded as a multiple-step purification point, and it is marked in the curve chart; when there are a fixed number of consecutive multiple-step purification points, the online purification of high-performance aluminum alloy manufacturing has been completed; Step 5: Repeat Step 2-Step 4 to control the smelting and gas purification of a new batch of scrap aluminum in the preparation area.

2. The online purification method for high performance aluminum alloy production according to claim 1, characterized in that: The specific process of analyzing the characteristics of scrap aluminum based on the scrap aluminum information in the preparation area is as follows: 201: several detection points are set in the material preparation area, and scrap aluminum information is obtained at each detection point, wherein the scrap aluminum information includes impurity types and the content, particle size and density corresponding to each impurity type; any one of the detection points is selected, and the impurity types contained in the scrap aluminum at the detection point are classified into melting point impurities and gas impurities; 202: Compare the melting point impurity with all the set melting point impurities to match the corresponding action coefficient, normalize the content and action coefficient corresponding to the melting point impurity, take the value, and multiply the value to obtain the action value of the melting point impurity; The melting point effect value is obtained by summing up the effect values ​​corresponding to each melting point impurity, normalizing it with the particle size and density and taking its value, and analyzing the value to obtain the melting point promotion value; 203: Compare the gas impurity with all set gas impurities to match the corresponding bubble coefficient, normalize the content and bubble coefficient corresponding to the gas impurity and take the numerical value, multiply the numerical value to obtain the bubble value of the gas impurity; sum the bubble values ​​of each gas impurity to obtain the bubble promotion value; 204: Thus, the melting point promotion value and the bubble promotion value at each detection point can be obtained, and the melting point promotion value and the bubble promotion value are compared and analyzed to obtain the melting promotion coefficient and the gas promotion coefficient; 205: The melting point promotion value, bubble promotion value, melting promotion coefficient and gas promotion coefficient at each detection point are calculated and analyzed by formulating a formula to obtain the melting point characteristic value and the gas characteristic value.

3. The online purification method for high performance aluminum alloy production according to claim 2, characterized in that: The specific process of comparative analysis of melting point promotion value and bubble promotion value is as follows: Compare and analyze the melting point promotion value with the set melting point range to divide the detection points corresponding to the melting point promotion value into high melting points, medium melting points and low melting points, count the number of high melting points, medium melting points and low melting points in the preparation area respectively, and calculate and analyze them in a formula to obtain the melting promotion coefficient; Similarly, the bubble promotion value is compared with the set bubble interval to divide the detection points corresponding to the bubble promotion value into high promotion points, medium promotion points and low promotion points, and the number of high promotion points, medium promotion points and low promotion points is counted respectively, and the formula is calculated and analyzed to obtain the shortness of breath coefficient.

4. The online purification method for high performance aluminum alloy production according to claim 1, characterized in that: The specific process of regulating the smelting purification of scrap aluminum based on the melting point characteristic value of the preparation area is as follows: After the furnace is preheated to the set temperature, the scrap aluminum in the preparation area is transported to the smelting furnace through the feed hopper. The amount of scrap aluminum put into the furnace is calculated as Fa, and the melting temperature RF is obtained by calculating it with the melting point characteristic value TC through the set formula RF=r1×Fa+r2×TC, where r1 and r2 are the set proportional coefficients respectively.

5. The online purification method for high performance aluminum alloy production according to claim 1, characterized in that: Monitor the degree of smelting during the smelting process to determine whether the smelting is complete, as follows: When the temperature in the boiler rises to the melting temperature, the melting photos in the furnace are obtained at certain intervals, thereby obtaining the melting photos corresponding to each acquisition moment; the melting photos corresponding to a certain acquisition moment are randomly selected, and are enlarged to form a number of pixel grids, and each color is set to correspond to a color value, and the color value and brightness corresponding to the pixel grid are identified, and the color value and brightness corresponding to the pixel grid are calculated and analyzed by formula to obtain the melting state value, thereby obtaining the melting state value corresponding to each acquisition moment; With time as the horizontal axis and the melting state value as the vertical axis, a curve graph of the melting state value changing with time is obtained; a tangent line is drawn at each state point, and the slope of each tangent line is calculated and recorded as the melting slope; when the melting state value is less than the set melting threshold, the corresponding state point is recorded as the initial melting point; the slope of the initial melting point is extracted, and when the melting slope is equal to zero, the initial melting point is recorded as the compound melting point, and it is marked in the curve graph; when there are a fixed number of consecutive compound melting points, the melting step of the scrap aluminum has been completed, and the cooling operation is carried out. When the temperature drops to a safe temperature, Step 4 is executed.

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