A method for improving the solidification quality of electroslag remelting ingots by dynamic zone cooling

Abstract

The invention relates to the technical field of improving the solidification quality of electroslag remelting ingots, and discloses a method for improving the solidification quality of electroslag remelting ingots by dynamic zoning cooling. The invention comprises a multi-cooling loop water-cooled crystallizer and a cooling chassis capable of individually controlling the cooling intensity; the whole system comprises a molten metal pool, a slag pool and an electroslag ingot, and a metal electrode to be melted is arranged directly above the slag pool; the upper clearance of the slag pool in the multi-cooling loop water-cooled crystallizer is a heat radiation area, the slag pool is divided into an upper area of ​​the slag pool and a lower area of ​​the slag pool, the molten metal pool is divided into an upper area of ​​the molten metal pool and a lower area of ​​the molten metal pool, and the solidified electroslag ingot is divided into an ingot completely solidified slow cooling area and an ingot completely solidified strong cooling area; as the electroslag remelting proceeds, the positions of the above-mentioned areas in the crystallizer will be dynamically lifted upward, and the corresponding positions of the areas are determined in real time, and the corresponding cooling modes are applied at the determined positions to improve the solidification quality of the ingots.

Description

Technical Field

[0001] The invention belongs to the technical field of improving the solidification quality of electroslag remelting ingots, and specifically relates to a method for improving the solidification quality of electroslag remelting ingots through dynamic zone cooling. Background Art

[0002] Electroslag remelting is an important special steel smelting process. Since the electroslag remelting process can effectively remove large-sized inclusions in the metal and improve the uniformity of the ingot structure, the core components of many devices, such as high-speed rail bearings and nuclear power rotors, require the use of corresponding metal billets produced by the electroslag remelting process. Although electroslag remelting has high production costs and relatively low efficiency, and is only used for the smelting of special metal materials with low production capacity, it has received increasing attention due to its extremely high profits.

[0003] At present, in the field of electroslag remelting technology, the work of metallurgical workers is mainly focused on the composition of electroslag, the control of current, voltage and other parameters during the electroslag remelting process, and less work has been done on the crystallizer. The molten metal after electroslag remelting solidifies in the crystallizer, so the cooling control of the crystallizer will largely determine the solidification quality of the ingot. Unlike traditional continuous casting crystallizers, the molten metal after electroslag remelting must not only complete the initial solidification in the crystallizer, but also complete the entire solidification process. Therefore, the cooling behavior of the electroslag remelting crystallizer will simultaneously determine the surface quality and internal structure morphology of the solidified ingot.

[0004] In order to ensure the surface quality of the solidified ingot, a weaker cooling mode should be used in the corresponding initial solidification area; and in order to improve the solidification quality and uniformity of the ingot, a strong cooling mode should be used in a certain area after the ingot has been completely solidified, so as to achieve a distribution trend in which the temperature gradient of the entire ingot gradually increases from bottom to top, promote the growth of grains along the axial direction, and reduce solidification segregation and looseness. For the clearance area at the upper end of the crystallizer that receives extremely strong thermal radiation, in order to increase the service life of the crystallizer, a strong cooling mode should be used to prevent the crystallizer from overheating. It can be seen that in order to further improve the solidification quality of the ingot and the service life of the crystallizer, different cooling modes should be adopted in different areas of the electroslag remelting crystallizer.

[0005] However, during the electroslag remelting process, as the smelting time continues to extend, the positions of the molten metal pool and the slag pool continue to rise. This causes the cooling mode at different positions of the electroslag remelting crystallizer to constantly change with the rise of the molten metal pool and the slag pool. For this reason, we propose a method to improve the solidification quality of electroslag remelting ingots through dynamic zone cooling. Summary of the invention

[0006] The purpose of the present invention is to improve the solidification quality of the ingot, and to provide a method for improving the solidification quality of the electroslag remelting ingot by dynamic zone cooling.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A method for improving the solidification quality of electroslag remelting ingots by dynamic zoning cooling, comprising a multi-cooling loop water-cooled crystallizer capable of individually controlling the cooling intensity, wherein the lower surface of the multi-cooling loop water-cooled crystallizer is fixedly connected to a cooling chassis, wherein a molten metal pool, a slag pool and a solidified electroslag ingot are formed inside the multi-cooling loop water-cooled crystallizer during the electroslag remelting process, wherein a metal electrode to be melted is located directly above the slag pool, wherein the upper clearance of the slag pool in the multi-cooling loop water-cooled crystallizer is a heat radiation clearance area, wherein the slag pool is divided into an upper area of ​​the slag pool and a lower area of ​​the slag pool, wherein the molten metal pool is divided into an upper area of ​​the molten metal pool and a lower area of ​​the molten metal pool, and wherein the solidified electroslag ingot is divided into an ingot fully solidified slow cooling area and an ingot fully solidified strong cooling area.

[0009] In a preferred embodiment of the invention, the multi-cooling loop water-cooled crystallizer is provided with a structure in which multiple circulating cooling waters are connected in parallel.

[0010] In a preferred embodiment of the invention, each individual cooling water circulation is provided with an individual flow meter, a circulation inlet and outlet cooling water thermometer and a pressure water supply device.

[0011] In a preferred embodiment of the invention, the height range of each circulating cooling effect is 20-50 mm.

[0012] In a preferred embodiment of the invention, the flow meter and the pressure water supply device are electrically connected to an external power source.

[0013] A method for improving the solidification quality of electroslag remelting ingots by dynamic zone cooling:

[0014] S1. The metal electrode to be melted is placed on the top of the interior of the multi-cooling loop water-cooled crystallizer for fixed clamping and the temperature of the metal electrode to be melted is increased. The upper heat radiation clearance area is subjected to the high temperature radiation of the heating of the metal electrode to be melted and the heating of the slag pool, and there is no protection of the solidified slag layer, which will not affect the quality of the initial solidification of the metal shell. Therefore, in order to ensure the life of the crystallizer, this area adopts the strong cooling mode, and the inlet and outlet water temperature difference of the cooling water is controlled at 10℃±2℃;

[0015] S2. The upper area of ​​the slag pool is still the highest temperature area. This area should adopt a medium cooling mode. On the one hand, it protects the crystallizer. On the other hand, it serves as a transition area to prevent excessive condensation of the slag and affect the initial solidification of the molten metal. The inlet and outlet temperature difference of the cooling water is controlled at 15℃±2℃;

[0016] S3. The temperature of the lower area of ​​the slag pool and the upper area of ​​the metal pool determines the initial solidification of the molten metal. The slower the solidification process here, the lower the high-temperature strength of the metal, the better the forming performance, and the higher the surface quality of the ingot. However, in order to ensure the supporting strength of the shell here, extremely weak cooling cannot be used. Therefore, this area adopts weak cooling mode, and the temperature difference between the inlet and outlet of the cooling water is controlled at about 20℃-22℃;

[0017] S4. The cooling conditions in the lower area of ​​the metal molten pool and the slow cooling area of ​​the ingot after complete solidification determine the growth pattern of the internal structure of the ingot to a certain extent. If the cooling intensity of this area is large, the heat transfer of the ingot along the axial direction will be strengthened, resulting in the development of grains along the axial direction, increasing defects such as solidification segregation and looseness. Therefore, only when this area is cooled as weakly as possible can the axial growth of the solidified structure be promoted. Therefore, this area adopts the ultra-weak cooling mode, and the temperature difference between the inlet and outlet of the cooling water is controlled at 25℃-30℃;

[0018] S5. For the strong cooling area where the ingot is completely solidified, the temperature gradient of the ingot along the axial direction can be increased as much as possible through the cooling of this area, which can promote the growth of the solidification structure of the ingot along the axial direction and improve the solidification quality of the ingot. Therefore, the strong cooling mode is adopted in this area, and the temperature difference between the inlet and outlet of the cooling water is controlled at 10℃±2℃;

[0019] S6. As the electroslag remelting smelting progresses, the positions of the molten metal pool and the slag pool continue to rise, and the different cooling areas of the crystallizer defined are constantly changing as the electroslag remelting smelting progresses;

[0020] S7. Use the buried heat flux meter to timely feedback the heat flux density information, determine the position of the slag pool and the molten metal pool according to the change of heat flux, and simultaneously determine other cooling areas and apply corresponding cooling modes, so that cooling can be implemented dynamically according to the latest position of the molten metal pool to improve the surface quality and internal solidification quality of the ingot.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. In the present invention, as the electroslag remelting proceeds, the positions of the above-mentioned regions in the crystallizer will be dynamically lifted upwards. By determining the corresponding positions of the regions in real time and applying the corresponding cooling modes at the determined positions, the solidification quality of the ingot can be improved.

[0023] 2. In the present invention, weak cooling is applied to the initial solidification area of ​​the molten metal. Under the premise of ensuring the strength of the initial solidification of the metal, the metal temperature is increased as much as possible, so that the metal obtains better toughness and plasticity, and the surface quality problems such as wrinkles on the surface of the ingot caused by excessive cooling intensity are reduced. At the same time, by adopting a cooling mode of upper mild cooling and lower strong cooling for the solidified electroslag ingot, the probability of the electroslag ingot grains growing along the axial direction is increased, and the solidification quality inside the ingot is improved.

[0024] 3. In the present invention, strong cooling can be implemented on the clear radiation zone above the crystallizer, thereby improving the service life of the crystallizer without affecting the solidification quality of the ingot. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front cross-sectional view of the present invention.

[0026] Markings in the figure: 1-multi-cooling loop water-cooled crystallizer, 2-cooling chassis, 3-molten metal pool, 4-slag pool, 5-metal electrode to be melted, 6-solidified electroslag ingot. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The following will be combined Figure 1 A method for improving the solidification quality of electroslag remelting ingots by dynamic zone cooling according to an embodiment of the present invention is described in detail.

[0029] Example:

[0030] Reference Figure 1A method for improving the solidification quality of electroslag remelting ingots by dynamic zoning cooling, comprising a multi-cooling loop water-cooled crystallizer 1 whose cooling intensity can be individually controlled, a cooling chassis 2 being fixedly connected to the lower surface of the multi-cooling loop water-cooled crystallizer 1, a metal molten pool 3, a slag pool 4 and a solidified electroslag ingot 6 being formed inside the multi-cooling loop water-cooled crystallizer 1 during the electroslag remelting process, a metal electrode 5 to be melted being arranged directly above the slag pool 4, the upper clearance of the slag pool 4 in the multi-cooling loop water-cooled crystallizer 1 being a heat radiation clearance area, which can implement strong cooling on the upper clearance radiation area of ​​the crystallizer without affecting the solidification quality of the ingot , improving the service life of the crystallizer; the slag pool 4 is divided into an upper area of ​​the slag pool and a lower area of ​​the slag pool, the metal pool 3 is divided into an upper area of ​​the metal pool and a lower area of ​​the metal pool, and the solidified electroslag ingot 6 is divided into an ingot complete solidification slow cooling area and an ingot complete solidification strong cooling area; ultra-weak cooling is adopted in the slow cooling area in the upper solidification area of ​​the ingot to reduce the radial temperature gradient of the ingot and limit the growth of the solidification structure in the radial direction; forced cooling is adopted in the lower part of the ingot solidification area to reduce the overall temperature of the area, increase the temperature gradient of the ingot along the axial direction, promote the growth of the solidification structure along the axial direction, thereby improving the solidification quality of the ingot.

[0031] Reference Figure 1 The metal electrode 5 to be melted is placed on the top of the inner part of the multi-cooling loop water-cooled crystallizer 1 for fixed clamping and the temperature of the metal electrode 5 to be melted is increased. The upper heat radiation clearance area is subjected to the high temperature radiation of the temperature increase of the metal electrode 5 to be melted and the temperature increase of the slag pool 4, and there is no protection of the solidified slag layer, and it will not affect the quality of the initial solidification of the metal shell. Therefore, in order to ensure the life of the crystallizer, this area adopts the strong cooling mode, and the temperature difference between the inlet and outlet of the cooling water is controlled at 10°C; the upper area of ​​the slag pool is still the highest temperature area, and this area should adopt the medium cooling mode On the one hand, it protects the crystallizer, and on the other hand, it serves as a transition area to prevent excessive condensation of slag and affect the initial solidification of the molten metal. The inlet and outlet temperature difference of the cooling water is controlled at 15°C; the temperature of the lower area of ​​the slag pool and the upper area of ​​the metal pool determines the initial solidification of the molten metal. The slower the solidification process here, the lower the high-temperature strength of the metal, the better the forming performance, and the higher the surface quality of the ingot. However, in order to ensure the supporting strength of the billet shell here, extremely weak cooling cannot be used. Therefore, this area adopts a weak cooling mode, and the inlet and outlet temperature difference of the cooling water is controlled at 20°C.

[0032] Reference Figure 1The cooling conditions in the lower area of ​​the molten metal pool and the slow cooling area of ​​the ingot after complete solidification determine the growth pattern of the internal structure of the ingot to a certain extent. If the cooling intensity in this area is large, the heat transfer of the ingot in the axial direction will be enhanced, resulting in the development of grains in the axial direction, increasing defects such as solidification segregation and porosity. Therefore, only when this area is cooled as weakly as possible can the axial growth of the solidification structure be promoted. Therefore, this area adopts the ultra-weak cooling mode, and the inlet and outlet temperature difference of the cooling water is controlled at 25°C; for the strong cooling area of ​​the ingot after complete solidification, the temperature gradient of the ingot in the axial direction can be increased as much as possible through the cooling of this area, which promotes the growth of the solidification structure of the ingot in the axial direction and improves the solidification quality of the ingot. Therefore, this area adopts the strong cooling mode, and the inlet and outlet temperature difference of the cooling water is controlled at 10°C; as the electroslag remelting smelting progresses, the positions of the molten metal pool 3 and the slag pool 4 continue to rise, and the different cooling areas of the crystallizer defined by the demarcation are constantly changing with the progress of the electroslag remelting smelting.

[0033] Reference Figure 1 The multi-cooling loop water-cooled crystallizer 1 is provided with a structure of multiple circulating cooling water in parallel. The height range of each circulating cooling effect is 20-50mm. The number of individual cooling water circulations of the crystallizer is determined by the height of the crystallizer; and each individual cooling water circulation is provided with an individual flow meter, a circulating inlet and outlet cooling water thermometer and a pressure water supply device. The flow meter and the pressure water supply device are electrically connected to an external power supply to ensure that the cooling effect of each circulation of the crystallizer can be controlled individually; as the electroslag remelting smelting proceeds, the ingot continues to increase, and the positions of the slag pool and the metal molten pool are also constantly rising. According to the results of the heat flux density sensor detection of the heat flux meter, the upper thermal radiation clearance area corresponding to the crystallizer, the upper area of ​​the slag pool, the lower area of ​​the slag pool, the upper area of ​​the metal molten pool, the lower area of ​​the metal molten pool, the ingot completely solidified slow cooling area, and the ingot completely solidified strong cooling area are re-divided. Due to the slow speed of electroslag remelting, the heat flux meter is tested every 30s-60s. After the cooling areas are redivided, the corresponding cooling modes are implemented for the new cooling area divisions until the electroslag remelting is completed; as the electroslag remelting proceeds, the positions of the above areas in the crystallizer will be dynamically raised upwards, and the corresponding positions of each area are determined in real time, and the corresponding cooling modes are applied at the determined positions to improve the solidification quality of the ingot.

[0034] The implementation principle of the method embodiment of the present application for improving the solidification quality of electroslag remelting ingots by dynamic zone cooling is as follows:

[0035] The metal electrode 5 to be melted is placed on the top of the inner part of the multi-cooling loop water-cooled crystallizer 1 for fixed clamping and the temperature of the metal electrode 5 to be melted is increased. The upper heat radiation clearance area is subjected to the high temperature radiation of the temperature increase of the metal electrode 5 to be melted and the temperature increase of the slag pool 4, and there is no protection of the solidified slag layer, and it will not affect the quality of the initial solidification of the metal shell. Therefore, in order to ensure the life of the crystallizer, this area adopts the strong cooling mode, and the temperature difference of the inlet and outlet water of the cooling water is controlled at 10℃±2℃; the upper area of ​​the slag pool is still the highest temperature area, and this area should adopt the medium cooling mode. On the one hand, it protects the crystallizer, and on the other hand, it serves as a transition area to prevent excessive condensation of slag and affect the initial solidification of the molten metal. The inlet and outlet temperature difference of the cooling water is controlled at 15℃±2℃; the temperature of the lower area of ​​the slag pool and the upper area of ​​the metal pool determines the initial solidification of the molten metal. The slower the solidification process here, the lower the high-temperature strength of the metal, the better the forming performance, and the higher the surface quality of the ingot. However, at the same time, in order to ensure the supporting strength of the billet shell here, extremely weak cooling cannot be used. Therefore, this area adopts a weak cooling mode, and the inlet and outlet temperature difference of the cooling water is controlled at 20℃-22℃.

[0036] The cooling conditions in the lower area of ​​the molten metal pool and the slow cooling area of ​​the ingot after complete solidification determine the growth pattern of the internal structure of the ingot to a certain extent. If the cooling intensity in this area is large, the heat transfer of the ingot in the axial direction will be enhanced, resulting in the development of grains in the axial direction and increasing defects such as solidification segregation and porosity. Therefore, only when this area is cooled as weakly as possible can the axial growth of the solidification structure be promoted. Therefore, this area adopts an ultra-weak cooling mode, and the inlet and outlet temperature difference of the cooling water is controlled at 25℃-30℃; for the strong cooling area of ​​the ingot after complete solidification, the temperature gradient of the ingot in the axial direction can be increased as much as possible through the cooling of this area, which promotes the growth of the solidification structure of the ingot in the axial direction and improves the solidification quality of the ingot. Therefore, this area adopts a strong cooling mode, and the inlet and outlet temperature difference of the cooling water is controlled at 10℃±2℃; as the electroslag remelting smelting progresses, the positions of the molten metal pool 3 and the slag pool 4 continue to rise, and the different cooling areas of the crystallizer defined by the demarcation are constantly changing with the progress of the electroslag remelting smelting.

[0037] As the electroslag remelting smelting progresses, the ingot continues to grow, and the positions of the slag pool and the molten metal pool are also constantly rising. According to the detection results of the heat flux density sensor of the heat flux meter, the upper thermal radiation clearance area corresponding to the crystallizer, the upper area of ​​the slag pool, the lower area of ​​the slag pool, the upper area of ​​the metal pool, the lower area of ​​the metal pool, the ingot completely solidified slow cooling area, and the ingot completely solidified strong cooling area are re-divided. Due to the slow speed of electroslag remelting, the heat flux meter is tested every 30s-60s. After the cooling area is re-divided, the corresponding cooling mode is implemented for the new cooling area division until the electroslag remelting smelting is completed; ultra-weak cooling is used in the upper slow cooling area of ​​the ingot solidification area to reduce the radial temperature gradient of the ingot and limit the growth of the solidification structure in the radial direction.

[0038] As the electroslag remelting proceeds, the positions of the above-mentioned areas in the crystallizer will be dynamically raised upwards. By determining the corresponding positions of each area in real time and applying the corresponding cooling mode at the determined positions, the solidification quality of the ingot can be improved.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for improving the solidification quality of electroslag remelting ingots by dynamic zone cooling, characterized in that: The following steps are involved: S1. The metal electrode (5) to be melted is placed on the top of the inner part of the multi-cooling loop water-cooled crystallizer (1) for fixed clamping and the metal electrode (5) to be melted is heated. Since the upper heat radiation clearance area is subjected to the high temperature radiation of the heating of the metal electrode (5) to be melted and the heating of the slag pool (4), and there is no protection of the solidified slag layer, it will not affect the quality of the initial solidification of the metal shell. Therefore, in order to ensure the life of the crystallizer, this area adopts a strong cooling mode, and the temperature difference between the inlet and outlet of the cooling water is controlled at 10°C ± 2°C; S2. The upper area of ​​the slag pool is still the highest temperature area. This area should adopt a medium cooling mode. On the one hand, it protects the crystallizer. On the other hand, it serves as a transition area to prevent excessive condensation of the slag and affect the initial solidification of the molten metal. The inlet and outlet temperature difference of the cooling water is controlled at 15℃±2℃; S3. The temperature of the lower area of ​​the slag pool and the upper area of ​​the metal pool determines the initial solidification of the molten metal. The slower the solidification process here, the lower the high-temperature strength of the metal, the better the forming performance, and the higher the surface quality of the ingot. However, in order to ensure the supporting strength of the billet shell here, extremely weak cooling cannot be used. Therefore, this area adopts weak cooling mode, and the temperature difference between the inlet and outlet of the cooling water is controlled at 20℃-22℃; S4. The cooling conditions in the lower area of ​​the metal molten pool and the slow cooling area of ​​the ingot after complete solidification determine the growth pattern of the internal structure of the ingot to a certain extent. If the cooling intensity of this area is large, the heat transfer of the ingot along the axial direction will be enhanced, resulting in the development of grains along the axial direction, increasing solidification segregation and loose defects. Therefore, only when this area is cooled as weakly as possible can the axial growth of the solidified structure be promoted. Therefore, this area adopts the ultra-weak cooling mode, and the temperature difference between the inlet and outlet of the cooling water is controlled at 25℃-30℃; S5. For the strong cooling area where the ingot is completely solidified, the temperature gradient of the ingot along the axial direction can be increased as much as possible through the cooling of this area, which can promote the growth of the solidification structure of the ingot along the axial direction and improve the solidification quality of the ingot. Therefore, the strong cooling mode is adopted in this area, and the temperature difference between the inlet and outlet of the cooling water is controlled at 10℃±2℃; S6. As the electroslag remelting process progresses, the positions of the molten metal pool (3) and the slag pool (4) continue to rise, and the different cooling areas of the crystallizer defined by the electroslag remelting process continue to change; S7. Use the buried heat flux meter to timely feedback the heat flux density information, determine the position of the slag pool and the molten metal pool according to the change of the heat flux, and simultaneously determine other cooling areas and apply corresponding cooling modes, so that cooling can be dynamically implemented according to the latest position of the molten metal pool (3), thereby improving the surface quality and internal solidification quality of the ingot.

2. A method for improving the solidification quality of electroslag remelting ingots by dynamic zone cooling, characterized in that: A device for improving the solidification quality of electroslag remelting ingots is used, comprising a multi-cooling loop water-cooled crystallizer (1) capable of independently controlling the cooling intensity, characterized in that: a cooling base plate (2) is fixedly connected to the lower surface of the multi-cooling loop water-cooled crystallizer (1), a metal molten pool (3), a slag pool (4) and solidified electroslag ingots (6) are formed inside the multi-cooling loop water-cooled crystallizer (1) during the electroslag remelting process, a metal electrode (5) to be melted is located directly above the slag pool (4), the upper clearance of the slag pool (4) in the multi-cooling loop water-cooled crystallizer (1) is a heat radiation clearance area, and the slag pool (4) is provided at the bottom of the multi-cooling loop water-cooled crystallizer (1). The pool (4) is divided into an upper area of ​​the slag pool and a lower area of ​​the slag pool, the metal molten pool (3) is divided into an upper area of ​​the metal molten pool and a lower area of ​​the metal molten pool, the solidified electroslag ingot (6) is divided into a slow cooling area for complete solidification of the ingot and a strong cooling area for complete solidification of the ingot, and the multi-cooling loop water-cooled crystallizer (1) is provided with a structure of multiple circulating cooling waters in parallel; each individual cooling water circulation is provided with an individual flow meter, a circulating inlet and outlet cooling water thermometer and a pressure water supply device; the height range of each circulating cooling effect is 20-50 mm; the flow meter and the pressure water supply device are electrically connected to an external power supply.

Images