Method for producing huge high-purity nickel ingot square billets through four-gun electron beam cold bed furnace

[0021] Embodiment one

[0022] Use electrolytic nickel with a purity of 99.5% as the raw material. After cleaning the surface, cut the electrolytic nickel. The diagonal line of the cut nickel block is ≤ 120mm, and then clean and dry the cut nickel block again. The drying temperature is 140°C, the drying time is 130min, and the small nickel block is put into the feeding system of the electron beam cold bed furnace, and the furnace body is pumped into the air, when the vacuum of the furnace body reaches ≤5.0×10 -5 hPa, vacuumize the cavity of the electron gun, and when the condition of opening the gun is reached, turn on 1 # The electron gun preheats the smelting cooling bed, the preheating power is 300kW, and the voltage is 40kV. After the preheating is over, the feeding system is turned on to feed the raw materials into the smelting cooling bed, and the power of the electron gun is loaded to the power required for smelting , The melting power is 450kW, and the voltage is 45kV. Start smelting, when the nickel liquid level is higher than the smelting cooling bed and starts to flow into the refining cooling bed, open 2 # The electron gun is used for primary refining of molten nickel, with a primary refining power of 550kW and a voltage of 35kV. When the entire refining cooling bed is completely covered by molten nickel, start 3 # The electron gun is used for secondary refining and purification, the secondary refining power is 430kW, and the voltage is 40kV. When refining is complete, turn on 3 # The overflow pattern of the electron gun makes the nickel liquid flow into the crystallizer, and simultaneously opens 4 # Forming electron gun is used to ensure the continuity of casting and the goodness of forming. The power of forming electron gun is 400kW and the voltage is 45kV. When the nickel liquid level of the crystallizer rises to the specified position (the size of the crystallizer is 1050mm×210mm), the ingot pulling starts, and the ingot pulling speed is 800kg/h. When the ingot is 8000mm long, the feeding is stopped and closed in sequence 1 # ,2 # 、3 # Electron gun, when the nickel liquid no longer flows into the crystallizer, use 4 # The electron gun is fed. After the feeding is completed, the dummy device is lowered to a low position, the melting chamber is isolated from the ingot drawing room, and the ingot drawing room is cooled with argon. After the cooling is completed, a giant high-purity nickel ingot billet can be obtained.

[0023] Embodiment two

[0024] Use electrolytic nickel with a purity of 99.5% as the raw material. After cleaning the surface, cut the electrolytic nickel. The diagonal line of the cut nickel block is ≤ 120mm, and then clean and dry the cut nickel block again. The drying temperature is 148°C, the drying time is 120min, and the small nickel block is put into the feeding system of the electron beam cold bed furnace, and the furnace body is evacuated. When the vacuum of the furnace body reaches ≤5.0×10 -5 hPa, vacuumize the cavity of the electron gun, and when the condition of opening the gun is reached, turn on 1 # The electron gun preheats the smelting cooling bed, the preheating power is 300W, and the voltage is 40kV. After the preheating is over, the feeding system is turned on to feed the raw materials into the smelting cooling bed, and the power of the electron gun is loaded to the power required for smelting , The melting power is 500kW, and the voltage is 50kV. Start smelting, when the nickel liquid level is higher than the smelting cooling bed and starts to flow into the refining cooling bed, open 2 # The electron gun is used for primary refining of molten nickel, with a primary refining power of 575kW and a voltage of 40kV. When the entire refining cooling bed is completely covered by molten nickel, start 3 # The electron gun is used for secondary refining and purification, the secondary refining power is 455kW, and the voltage is 45kV. When refining is complete, turn on 3 # The overflow pattern of the electron gun makes the nickel liquid flow into the crystallizer, and simultaneously opens 4 # Forming electron gun is used to ensure the continuity of casting and the goodness of forming. The power of forming electron gun is 375kW and the voltage is 40kV. When the nickel liquid level of the crystallizer rises to the specified position (the size of the crystallizer is 1050mm×210mm), the ingot pulling starts, and the ingot pulling speed is 800kg/h. When the ingot is 8000mm long, the feeding is stopped and closed in sequence 1 # ,2 # 、3 # Electron gun, when the nickel liquid no longer flows into the crystallizer, use 4# The electron gun is fed. After the feeding is completed, the dummy device is lowered to a low position, the melting chamber is isolated from the ingot drawing room, and the ingot drawing room is cooled with argon. After the cooling is completed, a giant high-purity nickel ingot billet can be obtained.

[0025] Embodiment three

[0026] Use electrolytic nickel with a purity of 99.5% as the raw material. After cleaning the surface, cut the electrolytic nickel. The diagonal line of the cut nickel block is ≤ 120mm, and then clean and dry the cut nickel block again. The drying temperature is 155°C, the drying time is 110min, and the small nickel block is put into the feeding system of the electron beam cold bed furnace, and the furnace body is pumped into the air, when the vacuum of the furnace body reaches ≤5.0×10 -5 hPa, vacuumize the cavity of the electron gun, and when the condition of opening the gun is reached, turn on 1 # The electron gun preheats the smelting cooling bed, the preheating power is 300kW, and the voltage is 40kV. After the preheating is over, the feeding system is turned on to feed the raw materials into the smelting cooling bed, and the power of the electron gun is loaded to the power required for smelting , The melting power is 550kW, and the voltage is 55kV. Start smelting, when the nickel liquid level is higher than the smelting cooling bed and starts to flow into the refining cooling bed, open 2 # The electron gun is used for primary refining of molten nickel, with a primary refining power of 600kW and a voltage of 45kV. When the entire refining cooling bed is completely covered by molten nickel, start 3 # The electron gun is used for secondary refining and purification, the secondary refining power is 480kW, and the voltage is 50kV. When refining is complete, turn on 3 # The overflow pattern of the electron gun makes the nickel liquid flow into the crystallizer, and simultaneously opens 4 # Forming electron gun is used to ensure the continuity of casting and the goodness of forming. The power of forming electron gun is 350kW and the voltage is 40kV. When the nickel liquid level of the crystallizer rises to the specified position (the size of the crystallizer is 1050mm×210mm), the ingot pulling starts, and the ingot pulling speed is 800kg/h. When the ingot is 8000mm long, the feeding is stopped and closed in sequence 1 # ,2 # 、3 # Electron gun, when the nickel liquid no longer flows into the crystallizer, use 4 # The electron gun is fed. After the feeding is completed, the dummy device is lowered to a low position, the melting chamber is isolated from the ingot drawing room, and the ingot drawing room is cooled with argon. After the cooling is completed, a giant high-purity nickel ingot billet can be obtained.