A liquid metal granulation system and method

Abstract

This invention relates to a liquid metal granulation system and method, belonging to the technical field of metallurgical equipment and methods. The technical solution of this invention is as follows: a molten iron chute (1) is connected to a molten iron buffer funnel (2); a novel wear-resistant material block (3) is placed below the molten iron buffer funnel (2); the vertical distance between the molten iron buffer funnel (2) and the novel wear-resistant material block (3) matches the granulated iron production rate; a molten iron granulation tank (4) is placed below the novel wear-resistant material block (3); granulation water nozzles (5) are installed on the side wall of the molten iron granulation tank (4); the bottom of the molten iron granulation tank (4) is connected to a granulated iron chute (6); the granulated iron chute (6) is connected to a belt conveyor (8) via a separating drum (7). The beneficial effects of this invention are: high degree of automation, high metal recovery rate, high production efficiency, uniform particle size, low oxide content, stable chemical composition, and safety and environmental protection.

Description

Technical Field

[0001] This invention relates to a liquid metal granulation system and method, belonging to the technical field of blast furnace production equipment and methods in the metallurgical industry. Background Technology

[0002] In the smelting process, complex compound minerals are generally smelted at high temperatures to form molten liquid metal, which is then solidified and shaped into end- or near-end-stage single-element products or compound products with relatively few elements. With the rapid development of ladle refining technology in steelmaking, there is a requirement to use solid granulated iron for in-furnace injection smelting. This places certain requirements on the particle size and shape of the granulated iron particles entering the furnace, which must be round and uniform. Summary of the Invention

[0003] The purpose of this invention is to provide a liquid metal granulation system and method. This system utilizes a uniformly flowing stream of molten iron to impact a novel wear-resistant material. The granulated iron particles, after being dispersed by the impact, enter a molten iron granulation tank for cooling. The cooled granulated iron particles are then separated by a rotating drum and transported by a belt conveyor for storage. This system enables fully automated production throughout the entire process of granulation, conveying, grading, drying, storage, and packaging. It boasts advantages such as high automation, high metal recovery rate, high production efficiency, uniform particle size, low oxide content, stable chemical composition, and safety and environmental friendliness. It can meet the development needs of my country's casting and steelmaking industries, reduce pollutant emissions, meet clean production standards, fill the gap in molten iron granulation process systems, and effectively solve the aforementioned problems existing in the background technology.

[0004] The technical solution of this invention is: a liquid metal granulation forming system, comprising a molten iron chute, a molten iron buffer funnel, a novel wear-resistant material block, a molten iron granulation tank, a granulation water nozzle, a granulated iron chute, a separation drum, and a belt conveyor. The molten iron chute is connected to the molten iron buffer funnel. The novel wear-resistant material block is positioned below the molten iron buffer funnel, and the vertical distance between the molten iron buffer funnel and the novel wear-resistant material block matches the granulated iron production capacity. The molten iron granulation tank is positioned below the novel wear-resistant material block, and the granulation water nozzle is installed on the side wall of the molten iron granulation tank. The bottom of the molten iron granulation tank is connected to the granulated iron chute, and the granulated iron chute is connected to the belt conveyor via the separation drum.

[0005] The molten iron chute is lined with refractory material and has a molten iron channel.

[0006] The molten iron buffer funnel is lined with refractory material, and a circular hole is pre-drilled at the center of the bottom. The diameter of the hole matches the output of granulated iron. The output is adjusted accordingly.

[0007] The diameter of the circular hole is between 50-150 mm.

[0008] The new wear-resistant material block is made of wear-resistant and high-temperature resistant refractory material. The new wear-resistant material block is semi-ellipsoidal in shape, and its curve is conducive to the granulation of molten iron flow.

[0009] The vertical distance between the molten iron buffer funnel and the new wear-resistant material block is between 1.0 and 2.5 m.

[0010] The number of granulating water nozzles is one or more, and the angle of the granulating water nozzles is between 15° and 45°; the granulating water nozzles use high-pressure water, with a water pressure between 0.3 and 0.7 MPa.

[0011] It also includes a water collection tank. The separating drum is equipped with a filter screen. The water collection tank is located below the separating drum. The water collection tank is connected to a hot water tank through a pipe. The hot water tank is connected to a cooling tower and a cold water tank through a hot water pump. The cooling tower and the cold water tank are connected to the molten iron granulation tank through a pump room. The pump is connected to the granulation water nozzle through a pipe.

[0012] It also includes a chimney, which is connected to the top of the separation drum and the molten iron granulation pool.

[0013] A method for granulating liquid metal includes the following steps: (1) The molten iron in the molten iron ladle is slowly poured into the molten iron chute. The molten iron flows slowly into the molten iron buffer funnel through the molten iron chute. The molten iron forms a uniform and stable molten iron column through the molten iron buffer funnel. The molten iron column flows vertically down and hits the new wear-resistant material block to form liquid iron beads. The vertical distance between the molten iron buffer funnel and the new wear-resistant material block is matched with the granular iron production. (2) Liquid iron beads fall into the cooling water of the molten iron granulation pool and are cooled to form granulated iron. Granulation water nozzles are installed on the side wall of the molten iron granulation pool. High pressure water is used for the granulation water nozzles. When the granulation water nozzles are arranged, a certain angle is taken to make the water in the molten iron granulation pool swirl, so that the cooling water and liquid iron beads are fully mixed. (3) After cooling, the granulated iron and water flow into the separation drum through the granulated iron chute for separation. The granulated iron falls onto the belt conveyor through the rotation of the drum. The finished granulated iron is transported to the finished product warehouse or finished product storage yard by the belt conveyor, or it can be screened by the grading screen.

[0014] In step (1), the vertical distance between the molten iron buffer funnel and the new wear-resistant material block is between 1.0 and 2.5 m.

[0015] In step (2), there is one or more granulation water nozzles, and the angle of the granulation water nozzles is between 15° and 45°; the granulation water nozzles use high-pressure water with a water pressure between 0.3 and 0.7 MPa.

[0016] In step (3), the particle size range of the finished iron pellets is 6mm-20mm.

[0017] It also includes a cooling water circulation step, where water flows through the filter screen of the separation drum into the water collection tank, and the water in the water collection tank flows into the hot water tank through the pipe. The hot water in the hot water tank is pumped into the cooling tower and cold water tank for cooling. The cooled water, along with the replenished water, is pumped into the molten iron granulation tank through the water pump in the pump room. The water pump is connected to the granulation water nozzle through the pipe to realize the circulation of cooling water.

[0018] Both the separation drum and the molten iron granulation tank are connected to chimneys for discharging steam.

[0019] The production process, temperature, water flow rate, pressure, drum movement, and belt conveyor control interlocks are all controlled by an automated control system.

[0020] The beneficial effects of this invention are as follows: By utilizing the impact of uniformly flowing molten iron on a novel wear-resistant material, the granulated iron particles, after being dispersed by the impact, enter the molten iron granulation tank for cooling. After cooling, the granulated iron particles are separated by a rotating drum and then transported by a belt conveyor for storage. This invention enables fully automated production of the entire process, including granulation, conveying, grading, drying, storage, and packaging. It has advantages such as high automation, high metal recovery rate, high production efficiency, uniform particle size, low oxide content, stable chemical composition, and safety and environmental protection. It can meet the development needs of my country's casting and steelmaking industries, reduce pollutant emissions, meet the requirements of clean production standards, and fill the gap in molten iron granulation process systems. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; In the diagram: 1. Molten iron chute; 2. Molten iron buffer funnel; 3. New wear-resistant material block; 4. Molten iron granulation tank; 5. Granulation water nozzle; 6. Granulated iron chute; 7. Separation drum; 8. Belt conveyor; 9. Hot water tank; 10. Cooling tower and cold water tank; 11. Pump room; 12. Chimney; 13. Molten iron ladle; 14. Water collection tank; 15. Granulated iron finished product stockpile. Detailed Implementation

[0022] To make the purpose, technical solutions, and advantages of the invention's embodiments clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only a small part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0023] A liquid metal granulation forming system includes a molten iron chute 1, a molten iron buffer funnel 2, a novel wear-resistant material block 3, a molten iron granulation tank 4, a granulation water nozzle 5, a granulated iron chute 6, a separation drum 7, and a belt conveyor 8. The molten iron chute 1 is connected to the molten iron buffer funnel 2. The novel wear-resistant material block 3 is located below the molten iron buffer funnel 2, and the vertical distance between the molten iron buffer funnel 2 and the novel wear-resistant material block 3 is matched with the granulated iron output. The molten iron granulation tank 4 is located below the novel wear-resistant material block 3, and the granulation water nozzle 5 is installed on the side wall of the molten iron granulation tank 4. The bottom of the molten iron granulation tank 4 is connected to the granulated iron chute 6, and the granulated iron chute 6 is connected to the belt conveyor 8 through the separation drum 7.

[0024] The molten iron chute 1 is lined with refractory material and has a molten iron channel.

[0025] The molten iron buffer funnel 2 is lined with refractory material, and a circular hole is pre-drilled at the center of the bottom. The diameter of the hole matches the output of granulated iron. The output is adjusted accordingly.

[0026] The diameter of the circular hole is between 50-150 mm.

[0027] The novel wear-resistant material block 3 is made of wear-resistant and high-temperature resistant refractory material. The novel wear-resistant material block 3 is semi-ellipsoidal in shape, and its curve is conducive to the granulation of molten iron flow.

[0028] The vertical distance between the molten iron buffer funnel 2 and the new wear-resistant material block 3 is between 1.0 and 2.5 m.

[0029] The number of granulating water nozzles 5 is one or more, and the angle of the granulating water nozzles 5 is between 15° and 45°; the granulating water nozzles 5 use high-pressure water, and the water pressure is between 0.3 and 0.7 MPa.

[0030] It also includes a water collection tank 14. The separating drum 7 is equipped with a filter screen. The water collection tank 14 is located below the separating drum 7. The water collection tank 14 is connected to the hot water tank 9 through a pipe. The hot water tank 9 is connected to the cooling tower and cold water tank 10 through a hot water pump. The cooling tower and cold water tank 10 are connected to the molten iron granulation tank 4 through a water pump room 11. The water pump is connected to the granulation water nozzle 5 through a pipe.

[0031] It also includes a chimney 12, which is connected to the top of the separation drum 7 and the molten iron granulation pool 4.

[0032] A method for granulating liquid metal includes the following steps: (1) The molten iron in the molten iron ladle is slowly poured into the molten iron chute. The molten iron flows slowly into the molten iron buffer funnel through the molten iron chute. The molten iron forms a uniform and stable molten iron column through the molten iron buffer funnel. The molten iron column flows vertically down and hits the new wear-resistant material block to form liquid iron beads. The vertical distance between the molten iron buffer funnel and the new wear-resistant material block is matched with the granular iron production. (2) Liquid iron beads fall into the cooling water of the molten iron granulation pool and are cooled to form granulated iron. Granulation water nozzles are installed on the side wall of the molten iron granulation pool. High pressure water is used for the granulation water nozzles. When the granulation water nozzles are arranged, a certain angle is taken to make the water in the molten iron granulation pool swirl, so that the cooling water and liquid iron beads are fully mixed. (3) After cooling, the granulated iron and water flow into the separation drum through the granulated iron chute for separation. The granulated iron falls onto the belt conveyor through the rotation of the drum. The finished granulated iron is transported to the finished product warehouse or finished product storage yard by the belt conveyor, or it can be screened by the grading screen.

[0033] In step (1), the vertical distance between the molten iron buffer funnel and the new wear-resistant material block is between 1.0 and 2.5 m.

[0034] In step (2), there is one or more granulation water nozzles, and the angle of the granulation water nozzles is between 15° and 45°; the granulation water nozzles use high-pressure water with a water pressure between 0.3 and 0.7 MPa.

[0035] In step (3), the particle size range of the finished iron pellets is 6mm-20mm.

[0036] It also includes a cooling water circulation step, where water flows through the filter screen of the separation drum into the water collection tank, and the water in the water collection tank flows into the hot water tank through the pipe. The hot water in the hot water tank is pumped into the cooling tower and cold water tank for cooling. The cooled water, along with the replenished water, is pumped into the molten iron granulation tank through the water pump in the pump room. The water pump is connected to the granulation water nozzle through the pipe to realize the circulation of cooling water.

[0037] Both the separation drum and the molten iron granulation tank are connected to chimneys for discharging steam.

[0038] The production process, temperature, water flow rate, pressure, drum movement, and belt conveyor control interlocks are all controlled by an automated control system.

[0039] In practical applications, molten iron from the ladle is slowly poured into the molten iron chute 1. The molten iron then slowly flows into the molten iron buffer funnel 2, forming a uniform and stable flow column. This column flows vertically down, directly impacting the new wear-resistant material block 3 to form liquid iron beads. To ensure that the liquid iron beads form with a suitable particle size, the vertical distance between the molten iron buffer funnel 2 and the new wear-resistant material block 3 must be adjusted to a suitable position based on the iron production output.

[0040] Liquid iron beads fall into the cooling water of the molten iron granulation tank 4 and are cooled to form granulated iron. Granulation water nozzles 5 are installed on the side wall of the molten iron granulation tank 4. The granulation water nozzles 5 use high-pressure water, and the granulation water nozzles 5 are arranged at a certain angle to create a swirling flow in the water of the molten iron granulation tank 4, which can fully mix the cooling water and the liquid iron beads.

[0041] After cooling, the granular iron and water flow into the separating drum 7 through the granular iron chute 6 for separation. The granular iron falls onto the belt conveyor 8 as the drum rotates. The finished granular iron is transported to the finished product warehouse or finished product storage yard by the belt conveyor 8, or it can enter the grading screen for screening and classification.

[0042] Water flows through the filter screen of the separating drum 7 into the water collection tank. The water in the water collection tank flows into the hot water tank 9 through the pipe. The hot water in the hot water tank 9 is pumped into the cooling tower and cold water tank 10 for cooling. The cooled water, along with the replenished water, is pumped into the molten iron granulation tank 4 through the water pump in the pump room 11. The water pump is connected to the granulation water nozzle 5 through the pipe to realize the recycling of cooling water.

[0043] Both the separation drum 7 and the molten iron granulation tank 9 are designed with chimneys 12 for draining steam.

[0044] The production process, temperature, water flow rate, pressure, drum movement, and belt conveyor control are all controlled by an automated control system.

[0045] This invention enables continuous automated production, resulting in high labor productivity and low production costs. The granulated iron is of high quality and uniform shape, with a particle size range of 6mm to 20mm. It can replace traditional cast iron machine production methods, offering lower energy consumption, smaller footprint, and high efficiency and environmental friendliness. The granulated iron product is also more suitable for subsequent processing, storage, and transportation of products.

Claims

1. A liquid metal granulation system, characterized in that: The system includes a molten iron chute (1), a molten iron buffer funnel (2), a new type of wear-resistant material block (3), a molten iron granulation tank (4), a granulation water nozzle (5), a granulated iron chute (6), a separation drum (7), and a belt conveyor (8). The molten iron chute (1) is connected to the molten iron buffer funnel (2). The new type of wear-resistant material block (3) is located below the molten iron buffer funnel (2). The vertical distance between the molten iron buffer funnel (2) and the new type of wear-resistant material block (3) is matched with the granulated iron production. The molten iron granulation tank (4) is located below the new type of wear-resistant material block (3). The granulation water nozzle (5) is installed on the side wall of the molten iron granulation tank (4). The bottom of the molten iron granulation tank (4) is connected to the granulated iron chute (6). The granulated iron chute (6) is connected to the belt conveyor (8) through the separation drum (7).

2. The liquid metal granulation system according to claim 1, characterized in that: The molten iron chute (1) is lined with refractory material and has a molten iron channel; the molten iron buffer funnel (2) is lined with refractory material and has a pre-reserved circular hole at the bottom center. The diameter of the circular hole matches the granulated iron output and is adjusted according to the output; the diameter of the circular hole is between 50-150mm; the material of the new wear-resistant material block (3) is wear-resistant and high-temperature resistant refractory material. The new wear-resistant material block (3) is semi-ellipsoidal in shape, and its curve is conducive to the granulation of the molten iron flow column.

3. The liquid metal granulation system according to claim 1, characterized in that: The vertical distance between the molten iron buffer funnel (2) and the new wear-resistant material block (3) is between 1.0 and 2.5 m.

4. The liquid metal granulation system according to claim 1, characterized in that: The number of granulating water nozzles (5) is one or more, and the angle of the granulating water nozzles (5) is between 15° and 45°; the granulating water nozzles (5) use high-pressure water, and the water pressure is between 0.3 and 0.7 MPa.

5. The liquid metal granulation system according to claim 1, characterized in that: It also includes a water collection tank (14), the separation drum (7) is equipped with a filter screen, the water collection tank (14) is located below the separation drum (7), the water collection tank (14) is connected to the hot water tank (9) through a pipe, the hot water tank (9) is connected to the cooling tower and cold water tank (10) through a hot water pump, the cooling tower and cold water tank (10) are connected to the molten iron granulation tank (4) through a water pump room (11), and the water pump is connected to the granulation water nozzle (5) through a pipe.

6. The liquid metal granulation system according to claim 1, characterized in that: It also includes a chimney (12) which is connected to the top of the separation drum (7) and the molten iron granulation pool (4).

7. A method for granulating liquid metal, characterized in that... Includes the following steps: (1) The molten iron in the molten iron ladle is slowly poured into the molten iron chute. The molten iron flows slowly into the molten iron buffer funnel through the molten iron chute. The molten iron forms a uniform and stable molten iron column through the molten iron buffer funnel. The molten iron column flows vertically down and hits the new wear-resistant material block to form liquid iron beads. The vertical distance between the molten iron buffer funnel and the new wear-resistant material block is matched with the granular iron production. (2) Liquid iron beads fall into the cooling water of the molten iron granulation pool and are cooled to form granulated iron. Granulation water nozzles are installed on the side wall of the molten iron granulation pool. High pressure water is used for the granulation water nozzles. When the granulation water nozzles are arranged, a certain angle is taken to make the water in the molten iron granulation pool swirl, so that the cooling water and liquid iron beads are fully mixed. (3) After cooling, the granulated iron and water flow into the separation drum through the granulated iron chute for separation. The granulated iron falls onto the belt conveyor through the rotation of the drum. The finished granulated iron is transported to the finished product warehouse or finished product storage yard by the belt conveyor, or it can be screened by the grading screen.

8. The liquid metal granulation method according to claim 7, characterized in that: In step (1), the vertical distance between the molten iron buffer funnel and the new wear-resistant material block is between 1.0 and 2.5 m; in step (2), the number of granulation water nozzles is more than one, and the angle of the granulation water nozzles is between 15° and 45°; the water pressure of the granulation water nozzles is between 0.3 and 0.7 MPa; in step (3), the particle size range of the finished granulated iron is 6 mm to 20 mm.

9. The liquid metal granulation method according to claim 7, characterized in that: It also includes a cooling water circulation step, where water flows through the filter screen of the separating drum into a water collection tank. The water in the water collection tank flows into a hot water tank through a pipe. The hot water in the hot water tank is pumped into a cooling tower and a cold water tank for cooling. The cooled water, along with makeup water, is pumped into the molten iron granulation tank through a pump in the pump room. The pump is connected to the granulation water nozzle through a pipe to realize the circulation of cooling water. Chimneys for draining steam are connected above the separating drum and the molten iron granulation tank.

10. The liquid metal granulation method according to claim 7, characterized in that: The production process, temperature, water flow rate, pressure, drum movement, and belt conveyor control interlocks are all controlled by an automated control system.

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