Chute for industrial silicon casting
By optimizing the size parameters and material of the chute, the problems of uneven silicon liquid flow rate and poor slag separation effect were solved, achieving stable silicon liquid flow and effective slag settling, thus improving the silicon casting quality and the mechanical strength of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA TONGWEI GREEN SUBSTRATE CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-05-19
AI Technical Summary
Existing industrial silicon casting chutes suffer from problems such as uneven silicon melt flow rate, splashing, and poor slag separation in large-scale production, especially at high temperatures where it is difficult to effectively drive the flow of silicon melt and the settling of slag.
A chute for industrial silicon casting is designed. By adjusting the width, height and length of the chute, the cross-sectional area of the flow channel is increased. A delay section is set to extend the flow path of the molten silicon. The bottom inclination angle is increased to enhance the fluidity by utilizing gravity. A graphite composite material with high thermal conductivity and high density is used to accelerate heat diffusion and enhance mechanical strength.
This allows the molten silicon to be more smoothly concentrated at the center of the ingot mold, reducing flow resistance, extending slag settling time, improving slag separation efficiency, preventing a decrease in fluidity, and enhancing mechanical strength and thermal shock resistance.
Smart Images
Figure CN224254210U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of industrial silicon casting technology, specifically to a chute for industrial silicon casting. Background Technology
[0002] In industrial silicon casting processes, the chute carbon brick is the core guiding component for transporting molten silicon from the silicon ladle to the ingot mold. Its design directly affects the flow efficiency of the molten silicon, the slag separation effect, and the final product quality.
[0003] In existing technologies, the width and height of traditional chute carbon bricks are problematic when facing large-scale industrial silicon casting. The width of the flow channel can easily cause uneven silicon flow velocity, with excessively high flow velocity in some areas leading to splashing. The excessively low height restricts the stability of silicon flow and makes it difficult to achieve effective slag deposition. In addition, insufficient flow channel inclination angle results in insufficient silicon flow, especially under high temperature (≥1600℃) conditions. When the viscosity of silicon decreases, the low inclination angle makes it difficult to effectively drive the silicon flow by gravity, and the slag cannot settle sufficiently to the bottom of the flow channel, resulting in poor slag separation. Utility Model Content
[0004] The purpose of this invention is to develop an industrial silicon casting chute that features a delay section to extend the flow path of molten silicon, reduce flow velocity impact, and allow the molten silicon to be more smoothly concentrated at the center of the ingot mold.
[0005] This utility model is achieved through the following technical solution:
[0006] A chute for industrial silicon casting, comprising:
[0007] case;
[0008] The substrate is rectangular in shape and located inside the shell;
[0009] The groove is formed on the base;
[0010] The groove is opened along the length of the base, one end of the groove along the length is an opening that penetrates the base, the opening of the groove extends 150mm out of the shell, and the other end of the groove along the length is a first inclined surface, the top of the first inclined surface is inclined away from the opening.
[0011] The bottom of the tank is a second inclined surface, which extends from the bottom of the first inclined surface to the opening end. The end where the second inclined surface connects to the first inclined surface is the high end.
[0012] The two side walls of the groove are symmetrical in the width direction.
[0013] Optionally, the angle between the second inclined plane and the horizontal plane is 5°.
[0014] Optionally, the two side walls in the width direction of the trough include, from top to bottom, a third inclined surface, a fourth inclined surface, and a vertical surface, with the top of the third inclined surface extending to the outer wall of the base.
[0015] Optionally, the tops of the third and fourth inclined surfaces are both inclined outwards towards the outside of the tank.
[0016] Optionally, the angle between the third inclined plane and the vertical plane is greater than the angle between the fourth inclined plane and the vertical plane.
[0017] Optionally, the matrix is a high-density carbon brick with a density ≥1.75g / cm³ and a compressive strength ≥35MPa.
[0018] Optionally, the carbon brick is a graphite composite material with a high thermal conductivity of ≥80W / m·K, and the smoothness Ra of the inner wall of the tank is ≤3.2μm.
[0019] Optionally, the substrate comprises, from the outside to the inside, an antioxidant layer on the outer surface, a high-strength layer in the middle, and a buffer layer on the inside.
[0020] Optionally, the housing includes a rectangular base plate, with side plates perpendicular to the base plate connected to opposite sides of the base plate, and a protective plate connected to the edge of the base plate between the two side plates. The base is disposed on the base plate and is located within the area enclosed by the two side plates and the protective plate.
[0021] Optionally, the length direction of the substrate is parallel to the side plate, the distance between the two side walls and the side plate in the length direction of the substrate is 75mm, and the space between the protective plate and the two side plates and the outer wall of the substrate is filled with a casting layer, which is corundum castable.
[0022] The beneficial effects of this utility model are:
[0023] This invention systematically optimizes dimensional parameters, including adjustments to width, height, and length, to expand the cross-sectional area of the tank flow channel and enhance the silicon liquid carrying capacity. The tank opening extends 150mm beyond the shell, creating a delay section in the silicon liquid flow path, extending the flow path, reducing flow velocity impact, and allowing the silicon liquid to be more smoothly concentrated at the ingot mold center. The bottom casting layer is eliminated to reduce flow resistance. The tilt angle of the tank bottom is increased to 5°, utilizing gravity to enhance the fluidity of the silicon liquid. Simultaneously, the synergistic effect of increasing the cross-sectional area of the flow channel and the tilt angle prolongs the slag settling time. The surface roughness of the tank flow channel is controlled, reducing slag adhesion. The matrix is made of graphite composite material with high thermal conductivity, accelerating the heat diffusion of the silicon liquid and avoiding a decrease in fluidity due to local overheating. The matrix is made of high-density material with high compressive strength, enhancing mechanical strength. The multi-layer composite structure of the matrix optimizes thermal shock resistance. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a structural diagram of the present utility model;
[0026] Figure 2 for Figure 1 Rotate the left view 90 degrees;
[0027] Figure 3 This is a diagram of the matrix structure.
[0028] Reference numerals: 100, shell; 101, base plate; 102, square tube; 103, side plate; 104, support plate; 105, diagonal brace; 106, protective plate; 200, base; 201, first inclined surface; 202, second inclined surface; 203, vertical surface; 204, fourth inclined surface; 205, third inclined surface; 300, casting layer. Detailed Implementation
[0029] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.
[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.
[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0032] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0033] like Figures 1-3 As shown, this utility model discloses a chute for industrial silicon casting, including a base 200. The base 200 is rectangular and has a length of 1672mm, a width of 800mm, and a height of 650mm.
[0034] A groove is provided on the base 200. The groove is opened along the length direction of the base 200. One end of the groove along the length direction is an opening end that penetrates the base 200. The other end of the groove along the length direction is a first inclined surface 201. The top of the first inclined surface 201 is inclined away from the opening end. There is a small gap between the top of the first inclined surface 201 and the outer wall of the base 200.
[0035] The bottom of the tank is a second inclined surface 202, which extends from the bottom of the first inclined surface 201 to the open end. The end where the second inclined surface 202 connects to the first inclined surface 201 is the high end. The angle between the second inclined surface 202 and the horizontal plane is 5°. The distance between the high end of the second inclined surface 202 and the outer wall of the base 200 opposite to the open end is 300mm. The width of the second inclined surface 202, that is, the distance between the two vertical surfaces 203, is also 300mm.
[0036] The two side walls of the tank are symmetrical in the width direction, and the two side walls include a third inclined surface 205, a fourth inclined surface 204 and a vertical surface 203 from top to bottom. The tops of the third inclined surface 205 and the fourth inclined surface 204 are inclined outward from the tank. The inclination angle of the third inclined surface 205 is larger than that of the fourth inclined surface 204. That is, the angle between the third inclined surface 205 and the vertical surface 203 is greater than the angle between the fourth inclined surface 204 and the vertical surface 203. The top of the third inclined surface 205 extends to the outer wall of the base 200.
[0037] The bottom end of the third inclined surface 205, which is also the top end of the fourth inclined surface 204, is arranged horizontally. The bottom end of the fourth inclined surface 204, which is also the top end of the vertical surface 203, slopes downward in the direction close to the opening end of the tank. The top and bottom of the vertical surface 203 are connected to the fourth inclined surface 204 and the second inclined surface 202, respectively.
[0038] The matrix 200 is made of high-density carbon bricks with a density ≥1.75g / cm³ and a compressive strength ≥35MPa, ensuring the stability of large-size structures at high temperatures. The smoothness of the inner wall of the tank is Ra≤3.2μm, and the carbon bricks are made of graphite composite material with a high thermal conductivity of ≥80W / m·K.
[0039] The substrate 200 includes a multi-layer composite structure, consisting of an anti-oxidation layer on the outer surface, a high-strength layer in the middle, and a buffer layer on the inner surface, from the outside to the inside. This improves the high temperature resistance of the substrate 200 to over 1600℃ and the coefficient of thermal expansion to ≤4.5×10^-6 / ℃.
[0040] The base 200 is provided with a shell 100, which includes a base plate 101. The base 200 is disposed on the base plate 101. The base plate 101 is rectangular. Side plates 103 perpendicular to the two long sides of the base plate 101 are respectively provided. A guard plate 106 perpendicular to the base plate 101 is provided on one short side of the base plate 101. The guard plate 106 is connected to the two side plates 103 on both sides. The base 200 is located inside the area enclosed by the guard plate 106 and the two side plates 103. The outlet of the tank on the base 200 faces the side away from the guard plate 106. The side wall of the base 200 where the outlet of the tank is located extends outward by 150mm from the edge of the base plate 101.
[0041] The base 200 is set parallel to the side plate 103 along its length. The distance between the two side walls of the base 200 and the two side plates 103 along its length is 75mm. The space between the protective plate 106 and the two side plates 103 and the outer wall of the base 200 is filled with a casting layer 300, which is a corundum casting material.
[0042] The bottom of the base plate 101 is provided with a plurality of square tubes 102 that are parallel to each other and perpendicular to the length direction of the base 200. The outer walls of the two side plates 103 are respectively provided with horizontally arranged support plates 104. The support plates 104 are provided with a plurality of diagonal braces 105 that are connected to the side plates 103 at equal intervals.
[0043] This invention systematically optimizes dimensional parameters, including adjustments to width, height, and length, to expand the cross-sectional area of the tank flow channel and enhance the silicon liquid carrying capacity. The tank opening extends 100-150mm beyond the shell, creating a delay section in the silicon liquid flow path, extending the flow path, reducing flow velocity impact, and allowing the silicon liquid to be more smoothly concentrated at the ingot mold center. The bottom casting layer 300 is eliminated to reduce flow resistance. The tilt angle of the tank bottom is increased to 5° to enhance the fluidity of the silicon liquid using gravity. Simultaneously, the synergistic effect of increasing the cross-sectional area of the flow channel and the tilt angle prolongs the slag settling time. The surface roughness of the tank flow channel is controlled, reducing slag adhesion. The substrate 200 is made of graphite composite material with high thermal conductivity, accelerating the heat diffusion of the silicon liquid and avoiding a decrease in fluidity caused by local overheating. The substrate 200 is a high-density material with high compressive strength, enhancing mechanical strength. The multi-layer composite structure of the substrate 200 optimizes thermal shock resistance.
[0044] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.
Claims
1. A chute for industrial silicon casting, characterized in that, include: case; The substrate is rectangular in shape and located inside the shell; The groove is formed on the base; The groove is opened along the length of the base, one end of the groove along the length is an opening that penetrates the base, the opening of the groove extends 150mm out of the shell, and the other end of the groove along the length is a first inclined surface, the top of the first inclined surface is inclined away from the opening. The bottom of the tank is a second inclined surface, which extends from the bottom of the first inclined surface to the opening end. The end where the second inclined surface connects to the first inclined surface is the high end. The two side walls of the groove are symmetrical in the width direction.
2. The industrial silicon casting chute according to claim 1, characterized in that, The angle between the second inclined plane and the horizontal plane is 5°.
3. The industrial silicon casting chute according to claim 1, characterized in that, The two side walls in the width direction of the trough include, from top to bottom, a third inclined surface, a fourth inclined surface, and a vertical surface, with the top of the third inclined surface extending to the outer wall of the base.
4. The industrial silicon casting chute according to claim 3, characterized in that, The tops of the third and fourth inclined surfaces both slope outwards towards the outside of the tank.
5. The industrial silicon casting chute according to claim 4, characterized in that, The angle between the third inclined plane and the vertical plane is greater than the angle between the fourth inclined plane and the vertical plane.
6. The industrial silicon casting chute according to claim 1, characterized in that, The matrix is a high-density carbon brick with a density ≥1.75g / cm³ and a compressive strength ≥35MPa.
7. The industrial silicon casting chute according to claim 6, characterized in that, The carbon brick is a graphite composite material with a high thermal conductivity of ≥80W / m·K, and the smoothness Ra of the inner wall of the tank is ≤3.2μm.
8. The industrial silicon casting chute according to claim 7, characterized in that, The substrate comprises, from the outside to the inside, an antioxidant layer on the outer surface, a high-strength layer in the middle, and a buffer layer on the inside.
9. The industrial silicon casting chute according to any one of claims 1 to 8, characterized in that, The housing includes a rectangular base plate, with side plates perpendicular to the base plate connected to opposite sides of the base plate, and a protective plate connected to the edge of the base plate between the two side plates. The base is disposed on the base plate and is located within the area enclosed by the two side plates and the protective plate.
10. The industrial silicon casting chute according to claim 9, characterized in that, The length direction of the base is parallel to the side plate, and the distance between the two side walls and the side plate in the length direction of the base is 75mm. The space between the protective plate and the two side plates and the outer wall of the base is filled with a casting layer, which is corundum castable.