CN110564982A

CN110564982A - Casting process of 1090 aluminum alloy plate ingot for cathode foil

Info

Publication number: CN110564982A
Application number: CN201910850848.6A
Authority: CN
Inventors: 侯经韬
Original assignee: Xinjiang Joinworld Co Ltd
Current assignee: Xinjiang Joinworld Co Ltd
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2019-12-13
Anticipated expiration: 2039-09-10
Also published as: CN110564982B

Abstract

The invention relates to a casting process of a 1090 aluminum alloy plate ingot for a cathode foil. A casting process of 1090 aluminum alloy plate ingots for cathode foils comprises the following steps: (1) selecting 3N electrolytic bath aluminum liquid with the aluminum purity of 99.90-99.92% as a liquid material; (2) refining: smelting the liquid material at 715-745 deg.C, and refining at 710-740 deg.C; drawing slag after refining, and standing; (3) blowing argon into molten aluminum in the furnace for blowing till the chemical components are uniform, and standing; (4) online degassing and filtering basin purification: after on-line degassing is carried out on the aluminum liquid, filtering by adopting a double-filtering basin mode; (5) casting: during casting starting, a small water quantity-slow speed method is adopted for starting operation, and then production in a stable stage is carried out. The casting process of the 1090 aluminum alloy plate ingot for the cathode foil solves the problem that the plate ingot is easy to crack when no refiner is added to 1090 aluminum alloy, and also solves the problem that the component requirements of downstream aluminum processing customers are high during corrosion and formation.

Description

Casting process of 1090 aluminum alloy plate ingot for cathode foil

Technical Field

The invention belongs to the technical field of aluminum alloy, and particularly relates to a casting process of a 1090 aluminum alloy plate ingot for a cathode foil.

Background

1090 aluminum alloy for cathode foil is produced according to the BSEN 573-3-2009 standard requirement, the raw material belongs to industrial high-purity aluminum (the aluminum purity is more than or equal to 99.9 percent), and the 1090 aluminum alloy is widely applied to electronic industries such as aluminum electrolytic capacitors and the like. The product is formed by casting, rolled into foil and then chemically corroded to become the raw material of the aluminum electrolytic capacitor, namely the low-voltage cathode foil. The cathode foil mainly comprises 1070A, 1090, 3003 and the like, wherein an 1090 aluminum alloy plate ingot requires low impurity content due to high purity, and belongs to high-quality required products in the aluminum alloy plate ingot for the cathode foil. At present, aluminum manufacturers such as China and foreign Japan and Korean manufacturers have advanced technical equipment level, and can directly use 3N aluminum ingots with 99.90 percent of aluminum content to be remelted and cast into plate ingots and then processed into cathode foils. And domestic aluminum processing manufacturers have insufficient production control level and high impurity content in the aluminum melt, so the 1090 aluminum alloy plate ingot is produced by mixing an aluminum ingot with 99.99 percent of aluminum content and an aluminum ingot with 99.85 percent of aluminum content according to a proportion, and compared with abroad, the cost is higher.

the corrosion process in the downstream aluminum processing production process of the cathode foil is mainly to form a honeycomb structure on the surface through chemical corrosion, and the honeycomb structure can be used for filling active substances. In order to ensure the corrosion and formation effects and avoid the condition of incomplete corrosion from influencing the capacitance of the product. Therefore, the requirements for the components in the product are high. This increases the production cost and process difficulty of 1090 aluminum alloy for the cathode foil.

A thin and compact oxide film is formed on the surface of the aluminum foil. The increase in the effective area of the oxide film of the cathode foil is greatly related to the chemical composition of the raw material in addition to the process, and the addition of trace elements (Cu, Fe, Si, Mg, Re, etc.) has a large influence on the specific capacitance, and it is an important technique to control the contents of the elements in the alloy. The electrode potential of the Cu element is higher than that of Al, the solid solution effect of Cu in an Al matrix is good, and after corrosion, the aluminum foil containing Cu can obtain corrosion pits with high density and good consistency. The effective area of the oxide film is increased. Fe element will generate cathode phase FeAl₃Thereby affecting its corrosion performance. The contents of Si and Fe are controlled within a certain rangeso that their coarsening effect and inconsistency negate the beneficial effect of Cu addition. Mg element increases the corrosion rate, but too high a content may cause edge cracking. B. Transition elements such as Ti, Cr, Zr, Sc, etc. or rare earth elements can greatly improve the corrosion resistance, and on the contrary, the increase of the elements is not beneficial to the corrosion of the cathode foil.

In order to ensure the quality of the cathode foil, the control range of alloy elements of the 1090 alloy plate ingot is strict, and the control of some elements causes certain difficulty in the casting process of the alloy plate ingot for the cathode foil. For example, Ti is a beneficial element in the casting process, and when the content is too low, the crystal grains are coarse and cooling is not uniform, which may cause cracking of the slab ingot. In order to inhibit cracking in the casting process, the content of Ti added in a conventional 1090 aluminum alloy plate ingot is about 0.02%, however, in the downstream cathode foil processing process, Ti is a harmful element, and the corrosion resistance is increased due to the fact that the content of Ti is too high, and corrosion efficiency is affected. Therefore, Ti content of 0.003% or less is generally required. For example, Mg element, which is required to be high in content in the cathode foil, increases the possibility of hydrogen absorption during casting, resulting in internal porosity and shrinkage of the slab ingot.

The patent CN201611198176.8 discloses a casting process of hard 1090 aluminum alloy for anodic oxidation, which comprises the following steps: putting electrolytic aluminum liquid with the aluminum purity of 99.90-99.92% into a smelting furnace, adding 1090 aluminum alloy cold burden with the mass ratio of not less than 20%, and controlling the smelting temperature at 710-725 ℃; refining after the smelting is finished, wherein the refining temperature is controlled to be 700-710 ℃, and the refining is finished within 45 min; and after refining, carrying out slab ingot casting, adding an Al-Ti-C0.15 grain refiner in a double-wire feeding mode before a stirring degassing box during casting, and carrying out temperature compensation at the tail end of a flow tank to ensure that the casting temperature is stabilized at 690-700 ℃. The invention relates to a 1090 alloy plate ingot which is produced by using industrial high-purity aluminum and has the plate ingot grain size of the first grade. However, the invention is a production process of a conventional 1090 aluminum alloy plate ingot nowadays. Before production, reasonable selection and fine adjustment are not carried out on various impurity elements from the angle of the electrolytic cell, and only the sum of the impurity elements is ensured. And in the subsequent production process, an Al-Ti-C0.15 refiner is added, and the Ti content in the conventional 1090 aluminum alloy is about 0.02 percent and obviously exceeds the lower limit of the Ti content required by the cathode foil production. The Ti content is a corrosion resistant element, and if the 1090 alloy plate ingot is directly used for processing and producing cathode foils, areas which are not completely corroded can be formed on the cathode foils, and serious quality problems are caused.

The invention discloses a casting processing technology of a soft 1090 aluminum alloy for anodic oxidation (CN201611198178.7), which comprises the following steps: putting electrolytic aluminum liquid with the aluminum purity of 99.90-99.92% into a smelting furnace, adding 1090 aluminum alloy cold burden with the mass ratio of not less than 20%, and controlling the smelting temperature at 730-735 ℃; refining after the smelting is finished, wherein the refining temperature is controlled to be 720-725 ℃, and the refining is finished within 45 min; and after refining, carrying out slab ingot casting, adding an Al-Ti-B0.5 grain refiner in a double-wire feeding mode before a stirring degassing box during casting, and carrying out temperature compensation at the tail end of a flow tank to ensure that the casting temperature is stabilized at 690-700 ℃. The invention relates to a 1090 alloy plate ingot which is produced by using industrial high-purity aluminum and has the plate ingot grain size of the first grade. However, the invention is a production process of a conventional 1090 aluminum alloy plate ingot nowadays. Before production, reasonable selection and fine adjustment are not carried out on various impurity elements from the angle of the electrolytic cell, and only the sum of the impurity elements is ensured. And an Al-Ti-B refiner is added in the subsequent production process, the Ti content in the conventional 1090 aluminum alloy is about 0.02 percent, and the lower limit of the Ti content required by the cathode foil production is obviously exceeded. The Ti content is a corrosion resistant element, and if the 1090 alloy plate ingot is directly used for processing and producing cathode foils, areas which are not completely corroded can be formed on the cathode foils, and serious quality problems are caused.

Therefore, how to enable the quality of the plate ingot of the 1090 aluminum alloy plate ingot to meet the requirement in the casting process without cracking and enable the quality indexes of the cathode foil, such as specific volume, strength and the like, to meet the requirement becomes the key for developing the 1090 aluminum alloy plate ingot for the cathode foil. In the aspects of research and development and marketing of the product in China, a core product technology for perfectly solving the problem in the aspects of quality and cost does not exist.

Disclosure of Invention

The invention aims to provide a casting process of a 1090 aluminum alloy plate ingot for a cathode foil, which solves the problem that the plate ingot is easy to crack when no refiner is added to 1090 aluminum alloy, and also solves the problem that the requirement on components is high when downstream aluminum processing customers corrode and form.

In order to realize the purpose, the adopted technical scheme is as follows:

A casting process of 1090 aluminum alloy plate ingots for cathode foils comprises the following steps:

(1) Selecting 3N electrolytic bath aluminum liquid with the aluminum purity of 99.90-99.92% as a liquid material;

in the 3N electrolytic bath aluminum liquid: less than or equal to 0.003 percent of Ti, less than or equal to 0.035 percent of Fe, less than or equal to 0.025 percent of Si, less than or equal to 0.002 percent of B, less than or equal to 0.002 percent of Zn and less than or equal to 0.01 percent of other impurity elements;

(2) Refining: smelting the liquid material at 715-745 deg.C, and refining at 710-740 deg.C; removing surface slag after refining, and standing for no less than 30 min;

(3) And (3) converting: blowing argon into the refined aluminum liquid in the furnace for converting until all chemical components are uniform, and standing for no less than 30 min;

(4) Online degassing and filtering basin purification: after on-line degassing is carried out on the blown aluminum liquid, the hydrogen content in the aluminum liquid is less than 0.14ml/100g, and then the aluminum liquid is filtered by adopting a double-filtering basin mode;

(5) casting: when the casting head is started, the machine is started by adopting a small water quantity-slow speed method, and then the production in a stable stage is carried out; after production, 50cm is respectively sawed at the beginning part and the ending part of the 1090 aluminum alloy plate ingot, and the remained middle part is the 1090 aluminum alloy plate ingot for the cathode foil.

Further, in the step (1), in the 3N electrolytic bath aluminum liquid: ti is less than or equal to 0.002%, the Fe/Si ratio is 1.5-2.5, Mg is less than or equal to 0.02%, Cu is less than or equal to 0.005%, Mn is less than or equal to 0.001%, and Cr is less than or equal to 0.001%.

further, in the step (2), the refining time is not more than 40min, and the slag is removed and then is kept stand for 30-60 min.

Furthermore, in the step (2), the amount of the refining agent is about 5 to 8 Kg/ton.

Further, in the step (3), the argon gas is blown into the molten aluminum in the furnace by adopting a blowing route in a shape of a Chinese character jing or a Chinese character 'zi'.

And further, in the step (3), the rolling height of the aluminum liquid in the blowing process is not more than 30cm, the blowing time is more than 25min, and the aluminum liquid is kept stand for 30-60 min.

Further, in the step (4), the online rotor rotating speed is 270-350 r/min.

Further, in the step (4), the filtering in the double filtering basin mode is that: the filter was first filtered through a single stage filter basin of 30 mesh and then through bipolar filter basins of 40 mesh and 60 mesh.

Further, in the step (5), during the beginning of casting, the casting speed is slowly increased from 35mm/min to 60mm/min, the single water flow is slowly increased from 375L/min to 700L/min, and then the production in the stable stage is carried out at the casting speed of 60mm/min and the water flow of 700L/min.

1. The invention relates to a technology for producing 1090 aluminum alloy plate ingots for cathode foils by taking a domestic mature 30-ton plate ingot casting machine as key equipment. The process solves the problems of no cracking and uniform components of 1090 aluminum alloy plate ingot casting for cathode foil under the condition of not adding a refiner by controlling the content of impurity elements, chemical compositions and uniformity of internal structure, reasonably setting casting parameters and the like.

2. The invention relates to a 1090 aluminum alloy plate ingot casting process for cathode foil, which takes the most common plate ingot casting production line in China at present as a core, uses 99.90-99.92% of industrial pure aluminum liquid, and finally prepares a 1090 aluminum alloy plate ingot product for preparing cathode foil by adopting the methods of linear continuous casting, homogenization treatment in a furnace and double-filtering basin filtering, wherein the plate ingot crystal grains are uniformly distributed.

3. The 1090 aluminum alloy plate ingot for producing the cathode foil by directly electrolyzing 3N aluminum liquid once can replace and use an aluminum ingot with 99.99 percent of aluminum content and an aluminum ingot with 99.85 percent of aluminum content to be mixed in proportion to produce the 1090 aluminum alloy plate ingot, thereby improving the competitiveness of aluminum products in China in the industry. The method is simple, suitable for industrial production of all types of plate and ingot casting machines in China, low in production cost, wide in practicability, suitable for batch production and obvious in comprehensive economic benefit.

Detailed Description

In order to further illustrate the casting process of 1090 aluminum alloy plate ingot for cathode foil according to the present invention, and achieve the intended purpose, the following detailed description of the casting process of 1090 aluminum alloy plate ingot for cathode foil according to the present invention, with reference to the preferred embodiments, the detailed description, the structure, the features and the efficacy thereof, are provided. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Before describing in detail the casting process of 1090 aluminum alloy plate ingot for cathode foil according to the present invention, it is necessary to further describe the raw materials and methods mentioned in the present invention to achieve better results.

the related key technology is as follows:

(1) the technical route of 1090 aluminum alloy plate ingot casting process for cathode foil is as follows: the 1090 aluminum alloy plate ingot for producing the cathode foil is produced by taking a domestic mature 30-ton plate ingot casting machine as key equipment, eight important links such as groove selection, batching, smelting, refining, standing, blowing, online degassing, double-basin filtering, casting and the like are required in the production process, but in terms of technical difficulty, how to select four aspects such as an electrolytic cell, furnace homogenization treatment, online degassing, filtering basin purification process, casting process setting and the like is the core technology of the whole product.

(2) 1090 aluminum alloy casting process for cathode foil, core quality and influencing factors are as follows: 1090 aluminum alloy plate ingot products for cathode foil have two clear technical indexes and a core quality requirement, and the two technical indexes are respectively: uniform internal structure and low content of impurity elements. One core quality requirement is: the defects of large-size cracks, slag inclusion and the like cannot be allowed to appear inside the steel tube. These indicators and requirements are mostly directly opposite, for example, Ti element can inhibit the growth of crystal grains, when the content of Ti element is reduced, the crystal grains are coarse during casting, and hot cracks are easy to appear. On the premise of not adding thinning elements, how to ensure the uniformity of the macrostructure. How to coordinate and unify various technical methods and control measures is the core of the whole product research and development.

the main factors affecting the quality of the product are focused on the following aspects.

A. selecting an electrolytic cell: in order to control the quality of 1090 aluminum alloy plate ingots for cathode foils from the source, high-quality electrolytic cells need to be reasonably selected and impurity elements need to be controlled.

In the present invention, the cathode foil is mainly controlled by a transitional element such as B, Ti, Cr, Zr, and Sc or a rare earth element, which is a harmful element, but the content of the element such as Ti/Cr/B should be controlled to a lower limit. Mg, Cu and other elements are beneficial elements and can be controlled within the middle limit. Fe element will react with Al to form FeAl₃Therefore, the lower limit is set. The Fe/Si ratio is controlled in order to prevent the Si element and the Fe element from offsetting the advantageous effect of the Cu element. Meanwhile, the total of the elements is controlled, the Al content is ensured to be more than 99.90 percent, the Fe content is less than 0.035 percent, the Si content is less than 0.025 percent, the Fe/Si ratio is 1.5-2.5, the Ti content is less than 0.003 percent, the Mg content is not specifically required, but is not more than 0.02 percent, the B, Zn content is less than 0.002 percent, the Cu content is less than 0.005 percent, and the content of other impurity elements is less than 0.01 percent.

B. And 4, homogenizing in the furnace, namely, because the 1090 alloy for the cathode foil has strict requirements on chemical composition control, adding waste materials during the furnace batching process is forbidden because impurity elements can be brought. Meanwhile, in order to control other impurity elements, Al-5Ti-B modifier is not used in the production process to refine grains, so that the internal structure of the aluminum alloy is uniform. Since there is no modifier, the cast structure is liable to be uneven and the cast head part is liable to be cracked. Once cracked, the self-healing of the subsequent casting process is difficult to achieve. How to ensure the uniformity of chemical compositions and internal structures on the premise of not adding refining elements is the key to influence whether the subsequent casting can be successful or not.

in the invention, the applicant develops a scheme for ensuring the uniformity of components by strengthening stirring in the furnace through a series of tests. In the smelting process in the furnace, the stirring is strengthened, the electromagnetic stirring time is prolonged, and an argon blowing process is added after refining, namely, argon with certain pressure is blown into molten aluminum in the furnace by adopting a blowing route in a shape of a Chinese character 'jing', the rolling height of the molten aluminum is not more than 30cm in the blowing process, and the blowing time is ensured to be more than 25 min. Sampling detection is carried out by adopting a triangular position, and if chemical components are not uniform, the procedures of stirring, standing and the like can be strengthened again.

C. And (3) in the processes of online degassing and filtering basin purification, wherein in the conventional 1090 aluminum alloy process, the rotating speed of an online rotor is 250 r/min.

In the present invention, uniformity is ensured. After the cathode foil is produced by using 1090 alloy, the rotating speed of the rotor in the wire is increased to 270-350r/min, and the flow of argon gas contacting aluminum liquid in the wire is ensured to be increased. The hydrogen content of the aluminum liquid after on-line degassing is detected, and the hydrogen content is ensured to be less than 0.14ml/100g stably. The size of the slag point in the aluminum liquid can be reduced by adopting a double-filtering basin filtering mode. Namely, after the aluminum liquid flows out of the on-line, the aluminum liquid is filtered by a single-stage filtering basin with 30 meshes, so as to remove slag points with larger size. Then filtered by bipolar filtering basins of 40 meshes and 60 meshes, and the content and the size of the slag in the aluminum liquid are further reduced. After filtration, the size of the slag point is controlled within tens of microns. The slag points are relatively fine and distributed in the aluminum liquid relative to the crystal grains. During solidification, the micro-sized slag points hinder the growth of the grains. Compared with 1090 aluminum alloy added with a refiner, the 1090 alloy for the cathode foil has a coarse low-power grain structure, and the slag point refining effect is not obvious.

D. The most important key requirement in the casting process is that no hot cracks are allowed. Since no refiner was added to the 1090 aluminum alloy for cathode foil, cracking was likely to occur in the cast starting portion (region up to 20cm after the start), and once cracks were formed, self-healing was difficult in the subsequent production process. As mentioned above, ensuring that the chemical composition and grain structure are uniform is critical to the success of the casting. In the casting stage, whether the technological parameters of the casting starting part are reasonably set can directly determine whether the casting of the cathode foil by using 1090 aluminum alloy plate ingots can be successful.

In the present invention, in order to prevent the generation of cracks, a low casting speed and a small water flow rate, i.e., a gentle gradient, are used at the time of casting start. Generally, the casting speed of the head part is slowly increased from 35mm/min to 60mm/min, and the flow rate of a single water is slowly increased from 375L/min to 700L/min.

the invention is not mentioned or detailed, and all that is adopted is the conventional technical means in the field.

With the above-mentioned methods and others in mind, the casting process of 1090 aluminum alloy plate ingot for cathode foil according to the present invention will be described in further detail with reference to the following embodiments:

The technical scheme of the invention is as follows:

(1) Selecting 3N electrolytic bath aluminum liquid with the aluminum purity of 99.90-99.92% as a raw material, wherein the selection standard of the electrolytic bath is selected according to the following table 1. In the selection process, the content of Ti element is preferably less than or equal to 0.003 percent, and then the content of Fe is less than or equal to 0.035 percent, the content of Si is less than or equal to 0.025 percent, the content of B element is less than or equal to 0.002 percent, the content of Zn element is less than or equal to 0.002 percent, and the content of Cu is less than 0.005 percent. Other impurity elements are controlled within 0.01 percent. In the cathode foil, Mg is a beneficial element, which can be subject to no limitation, subject to the actual Mg content in the electrolytic cell.

Table 11090 electrolytic bath selection standard for alloy

Element(s)	Fe	Si	Cu	Zn	Ti
						not more than content (%)	0.0350	0.0250	0.0050	0.0020	0.0030
element(s)	Mg	Mn	Cr	B
						Not more than content (%)	0.0020	0.0010	0.0010	0.0020

(2) refining: controlling the smelting temperature at 715-745 ℃; after the smelting is finished, refining by using an aluminum refining agent, wherein the dosage of the refining agent is about 5-8 Kg/ton. The refining temperature is controlled between 710 and 740 ℃. Refining is completed within 40min, and then slag is removed. Refining, skimming, standing for 30-60min (standing for better aggregating impurities).

(3) Converting treatment (in-furnace homogenization treatment): and (2) carrying out blowing operation by using argon, blowing the argon with certain pressure into the molten aluminum in the furnace by adopting a blowing route in a shape of a Chinese character 'jing', wherein the rolling height of the molten aluminum in the blowing process is not more than 30cm, ensuring that the blowing time is more than 25min, and then standing for not less than 30 min. Sampling and detecting by adopting a triangular position, and if the chemical components are not uniform, blowing again. And (5) standing, sampling and analyzing, repeating the processes until the chemical components are uniform, and then standing for production.

The sampling detection of the position of the triangle is that: and selecting three positions for sampling within a distance range of more than 1m from the furnace edge, wherein the three positions form a triangle, and each position takes three samples.

(4) Online degassing and filtering basin purification: in the online device, the online rotor rotating speed is ensured to be 270-350 r/min. And the rotation speed is finely adjusted by the production personnel according to the online rolling condition of the internal molten aluminum. A hydrogen content check is then carried out after the line to ensure that the hydrogen content is less than 0.14ml/100 g. The filtering is carried out by adopting a double filtering basin mode, namely, the filtering is carried out by a single-stage filtering basin with 30 meshes, and then the filtering is carried out by bipolar filtering basins with 40 meshes and 60 meshes, thereby achieving the purpose of removing slag points.

(5) And (3) casting process: and casting a starting part of the plate ingot, and performing start-up operation by adopting a small water flow-slow speed method. The speed and amount of water were operated as shown in table 2 below. The number of the plate ingots in the casting is 2, and the water flow is calculated according to two.

TABLE 2 initial part casting parameter settings

Casting length (mm)	0	50	100	200
					Casting speed (mm/min)	35	40	45	60
Single water flow (L/min)	375	475	575	700

Then, the production in the stabilization phase was carried out at a casting speed of 60mm/min and a single water flow rate of 700L/min. The production is carried out according to the length required by the process. And after the production is finished, respectively sawing 50cm at the beginning part and the ending part of the 1090 aluminum alloy plate ingot, and leaving the middle part as a finished product.

The invention selects standard of 3N aluminum liquid electrolytic cell, in-furnace homogenization treatment and online degassing and double-basin filtering purification process, and casting process parameters of the plate ingot without cracking under the condition of not adding a refiner, especially parameter setting of the starting part. Finally, 1090 aluminum alloy plate ingot products which can be used for preparing cathode foils are obtained, and the plate ingot grains are distributed uniformly. The problems that the 1090 aluminum alloy plate ingot for the cathode foil is not cracked and has uniform components under the condition that no refiner is added are solved.

Example 1.

The specific operation steps are as follows:

(1) Selecting the aluminum liquid of the 3N electrolytic cell which meets the requirement of the first table as a liquid material.

(2) Refining: and (3) smelting the liquid material, controlling the smelting temperature to be 725 ℃, and intensively stirring in the smelting process in the furnace, and prolonging the stirring time to 40 min. Then refining by using an aluminum refining agent, wherein the dosage of the refining agent is 6 Kg/ton, and the refining temperature is 717 ℃. Refining is completed in 35min, slag is removed, and then standing is carried out for 40 min.

(3) And (3) converting: and blowing argon in the furnace at the blowing temperature of 720 ℃, blowing argon with certain pressure into molten aluminum in the furnace by adopting a zigzag blowing route, wherein the rolling height of the molten aluminum is not more than 30cm in the blowing process, the blowing time is 28min, and the molten aluminum is kept stand for 42 min. Sampling detection is carried out by adopting the position of a triangle, and if each chemical component is not uniform, blowing treatment can be carried out again. And (5) standing, sampling and analyzing, repeating the processes until the chemical components are uniform, and then standing for production.

(4) Online degassing and filtering basin purification: after production is started, online degassing treatment is carried out on the blown aluminum liquid, the rotating speed of the inner rotor is set at 300r/min, and then hydrogen content detection is carried out after online, wherein the hydrogen content is 0.129ml/100 g.

Then the slag is removed by adopting a double-filtering basin filtering mode. The filter was first filtered through a single stage filter basin of 30 mesh and then through bipolar filter basins of 40 mesh and 60 mesh.

(5) Casting: the specification of this cast slab ingot was 1100 mm. times.520 mm. times.L (length). In the casting process, the start part adopts a small water quantity-slow speed method to carry out start operation, the casting speed within the range from the start to the inside 20cm is gradually increased from 35mm/min to 60mm/min, and the water flow is controlled to be gradually increased from 750L/min to 1400L/min (since the number of the cast plate ingots is 2 at this time, the water flow is calculated according to two). The stabilization stage was carried out at a casting speed of 60mm/min and a water flow of 1400L/min. And after the production is finished, cutting the beginning and the end of the aluminum alloy plate ingot by 50cm respectively, and leaving the middle part as a finished product, namely 1090 aluminum alloy plate ingot for the cathode foil. And (5) carrying out chemical component and macrostructure inspection on the finished product, wherein the finished product has uniform components and uniform tissues.

Example 2.

The specific operation steps are as follows:

(2) refining: and (3) smelting the liquid material, controlling the smelting temperature at 715 ℃, and intensively stirring in the smelting process in the furnace, so as to prolong the stirring time to 50 min. Then refining by using an aluminum refining agent, wherein the dosage of the refining agent is 8 Kg/ton, and the refining temperature is 710 ℃. Refining is completed in 40min, slag is removed, and then standing is performed for 40 min.

(3) And (3) converting: and (3) blowing argon in the furnace, wherein the blowing temperature is 717 ℃, blowing argon with certain pressure into molten aluminum in the furnace by adopting a blowing route in a shape of a Chinese character 'jing', wherein the rolling height of the molten aluminum is not more than 30cm in the blowing process, the blowing time is 30min, and the molten aluminum is kept stand for 50 min. Sampling detection is carried out by adopting the position of a triangle, and if each chemical component is not uniform, blowing treatment can be carried out again. And (5) standing, sampling and analyzing, repeating the processes until the chemical components are uniform, and then standing for production.

(4) Online degassing and filtering basin purification: after production is started, online degassing treatment is carried out on the blown aluminum liquid, the rotating speed of an inner rotor is set at 270r/min, and then hydrogen content detection is carried out after online, wherein the hydrogen content is 0.131ml/100 g.

(5) Casting: in the casting process, the start part adopts a small water quantity-slow speed method to carry out start operation, the casting speed within the range from the start to the inside 20cm is gradually increased from 35mm/min to 60mm/min, and the water flow is controlled to be gradually increased from 750L/min to 1400L/min (since the number of the cast plate ingots is 2 at this time, the water flow is calculated according to two). The stabilization stage was carried out at a casting speed of 60mm/min and a water flow of 1400L/min. And after the production is finished, cutting the beginning and the end of the aluminum alloy plate ingot by 50cm respectively, and leaving the middle part as a finished product, namely 1090 aluminum alloy plate ingot for the cathode foil. And (5) carrying out chemical component and macrostructure inspection on the finished product, wherein the finished product has uniform components and uniform tissues.

Example 3.

the specific operation steps are as follows:

(2) Refining: smelting the liquid material, controlling the smelting temperature at 745 ℃, and intensively stirring in the smelting process in the furnace for 30 min. Then refining by using an aluminum refining agent, wherein the dosage of the refining agent is 5 Kg/ton, and the refining temperature is 740 ℃. Refining is completed in 33min, slag is removed, and then standing is carried out for 60 min.

(3) And (3) converting: and (3) blowing argon in the furnace, wherein the blowing temperature is 717 ℃, blowing argon with certain pressure into molten aluminum in the furnace by adopting a blowing route in a shape of a Chinese character 'jing', wherein the rolling height of the molten aluminum is not more than 30cm in the blowing process, the blowing time is 29min, and the molten aluminum is kept stand for 45 min. Sampling detection is carried out by adopting the position of a triangle, and if each chemical component is not uniform, blowing treatment can be carried out again. And (5) standing, sampling and analyzing, repeating the processes until the chemical components are uniform, and then standing for production.

(4) online degassing and filtering basin purification: after production is started, online degassing treatment is carried out on the blown aluminum liquid, the rotating speed of the inner rotor is set at 305r/min, and then hydrogen content detection is carried out after online, wherein the hydrogen content is 0.125ml/100 g.

Nowadays, the performance index of cathode foil is mainly the ratio of the capacitance of the foil to be measured to the capacitance of the standard foil (abbreviated as capacity ratio in the table). Conventionally, the process for producing the cathode foil cannot control the capacitance very accurately, typically to ± 10%. At present, the same batch of cathode foil produced using the conventional method was extracted, and the capacity ratio thereof is shown in table 3. And the products prepared in examples 1 to 3 were measured at both ends and in the middle part, respectively, and the capacity ratios thereof are shown in table 3.

TABLE 3

Sample numbering	Volume ratio	Sample numbering	Volume ratio
				1	100％	Example 1	95％
2	98％	Example 1	100％
				3	60％	example 1	100％
4	54％	example 2	94％
				5	74％	Example 2	98％
6	92％	Example 2	100％
				7	102％	Example 3	96％
8	102％	Example 3	99％
						Example 3	100％

As can be seen from the table, the cathode foil produced by the traditional method has unstable product quality and large error which can reach 48%. The cathode foil produced by the invention has stable product quality and small error.

And through communication with foreign customers, the capacity ratio of the cathode foil produced by the method is basically controlled between 90% and 100%, the product quality is stable, the error is small, and the method meets the customer requirements.

The 1090 alloy plate ingot process method for the cathode foil is gradually summarized in the production process, and not only solves the problem that the plate ingot is easy to crack when no refiner is added to 1090 aluminum alloy, but also solves the problem that the component requirement of downstream aluminum processing customers is high during corrosion and formation. The 1090 alloy plate ingot produced by the process has uniform components and performance, can replace 1090 alloy plate ingot produced by part of 99.99% aluminum and 99.85% mixture, has practicability and considerable economic value, and belongs to an advanced industrial production process.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A casting process of 1090 aluminum alloy plate ingots for cathode foils is characterized by comprising the following steps:

2. The casting process according to claim 1,

In the step (1), in the 3N electrolytic bath aluminum liquid: ti is less than or equal to 0.002%, the Fe/Si ratio is 1.5-2.5, Mg is less than or equal to 0.02%, Cu is less than or equal to 0.005%, Mn is less than or equal to 0.001%, and Cr is less than or equal to 0.001%.

3. The casting process according to claim 1,

in the step (2), the refining time is not more than 40min, and the refining is carried out for 30-60min after slagging-off.

4. The casting process according to claim 1,

In the step (2), the dosage of the refining agent is about 5 to 8 Kg/ton.

5. The casting process according to claim 1,

in the step (3), the argon is blown into the molten aluminum in the furnace by adopting a blowing route in a shape of a Chinese character 'jing' or a Chinese character 'zigzi'.

6. the casting process according to claim 5,

In the step (3), the tumbling height of the aluminum liquid in the blowing process is not more than 30cm, the blowing time is more than 25min, and the aluminum liquid is kept stand for 30-60 min.

7. The casting process according to claim 1,

In the step (4), the online rotor rotating speed is 270-350 r/min.

8. The casting process according to claim 1,

In the step (4), the filtering in the double-filtering basin mode is as follows: the filter was first filtered through a single stage filter basin of 30 mesh and then through bipolar filter basins of 40 mesh and 60 mesh.

9. The casting process according to claim 1,

In the step (5), during casting starting, the casting speed is slowly increased from 35mm/min to 60mm/min, the single water flow is slowly increased from 375L/min to 700L/min, and then the production in the stable stage is carried out at the casting speed of 60mm/min and the water flow of 700L/min.