Вплив електромагнітного перемішування розплаву на технологічний процес одержання алюмінієвого порошку
Efficiency of including the operation of electromagnetic stirring is shown on example of aluminium powder production modernization. The existing technological scheme was characterized by inefficiency due to the need to pour the melt with a ladle from the rotary furnace to the resistance furnaces, in...
Збережено в:
| Дата: | 2023 |
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| Автори: | , , , , |
| Формат: | Стаття |
| Мова: | Українська |
| Опубліковано: |
Physico-technological Institute of Metals and Alloys
2023
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| Теми: | |
| Онлайн доступ: | https://www.metalsandcasting.com/index.php/mcu/article/view/222 |
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| Назва журналу: | Metal and Casting of Ukraine |
Репозитарії
Metal and Casting of Ukraine| Резюме: | Efficiency of including the operation of electromagnetic stirring is shown on example of aluminium powder production modernization. The existing technological scheme was characterized by inefficiency due to the need to pour the melt with a ladle from the rotary furnace to the resistance furnaces, increased electricity costs due to the need to overheat the entire bath of liquid metal to the injection temperature, and the difficulty of adjusting the temperature of the melt, which led to the metal crystallization in the nozzle or required its significant overheating above 900 ºС. Due to modernization, the intermediate resistance furnaces were replaced by a resistance furnace with a capacity of 1.5 tons, equipped with an electromagnetic stirrer of liquid metal. This led to an increase in the production productivity, decrease in energy costs and an increase in the level of automatization. Stirring system provides a non-contact influence on the liquid metal and allows to maintain the necessary temperature and hydrodynamic regimes of the melt in the crucible of the resistance furnace. To form a stirrer channel, a mixture based on vologran was used. It has high heat resistance, low density and thermal conductivity, high chemical resistance to liquid aluminium alloys and low tendency to oxides overgrowth. The use of melt electromagnetic stirring eliminated its overheating in crucible and stabilized the temperature near point of 790 ± 10 ºС. At the same time, the temperature of a metal in the injection zone was 840-850 ºС. Stabilizing the temperature regimes of melt injection made it possible to exclude its crystallization in the nozzle and increase its service life. Lowering the injection temperature by 50-60 ºC made it possible to reduce the oxidation of powder particles, which increased its quality. Modernization of production increased the production capacity of aluminium alloy powder from 300 to 500 kg/hour. |
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