电磁熔体混合对铝粉生产工艺过程的影响

S. L. Polyvoda, O. V. Siryi, O. M. Hordynia, V. O. Tverdokhvalov, O. V. Perekhoda
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引用次数: 0

摘要

以铝粉生产现代化为例,说明了加入电磁搅拌操作的有效性。现有技术方案的特点是由于需要用钢包将熔体从旋转炉倒入电阻炉而效率低下,由于需要将整个液态金属浴过热至喷射温度而增加了电力成本,并且由于难以调节熔体温度而导致金属在喷嘴中结晶或需要其显着过热900ºС。由于现代化,中间电阻炉被容量为1.5吨的电阻炉所取代,配备了液态金属的电磁搅拌器。这导致了生产效率的提高,能源成本的降低和自动化水平的提高。搅拌系统提供对液态金属的非接触影响,并允许保持电阻炉坩埚中熔体的必要温度和流体动力学状态。为了形成搅拌通道,使用了基于vologran的混合物。它具有高耐热性,低密度和导热性,对液态铝合金具有高的耐化学性和低氧化物过度生长的倾向。采用电磁搅拌消除了熔体在坩埚内的过热现象,使温度稳定在790±10ºС附近。同时,注射区某金属的温度为840 ~ 850ºС。稳定熔体喷射温度使其在喷嘴中不结晶成为可能,并延长了其使用寿命。将注射温度降低50-60℃,可以减少粉末颗粒的氧化,从而提高其质量。现代化生产使铝合金粉的生产能力从300公斤/小时提高到500公斤/小时。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of electromagnetic melt mixing on the technological process of aluminium powder production
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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