熔盐电解生产Al-Sr合金的新工艺及其加料周期

研究了以SrCO3为原料熔盐电解法生产Al-Sr合金新工艺,采用连续脉冲-示波器法测定电解过程的反电动势.结果发现:(1)延长电解时间,合金中锶的质量分数逐渐增加,最高可达18.54%;(2)增加电流密度,反电动势亦随之增加,而升高温度反电动势则有所降低;(3)在电解过程中,反电动势逐渐增加,但向熔体中加入SrCO3后,反电动势明显降低.因此确定在正常电解时是SrCO3在分解.以此规律制定了正常生产的加料周期和加料量,保证了生产的稳定进行.以SrCO3为原料生产Al-Sr合金,不但减少了环境污染,也降低了Al-Sr合金的生产成本.

New process for preparation of Al-Sr alloys by molten salt electrolysis and its feeding study on period

A new process for Al-Sr alloy preparation by molten salt electrolysis with SrCO_3 for raw materials is studied. The back EMF in the process of electrolysis is measured by continuous pulse-oscillograph. It is found that the mass fraction of Sr in alloy increases with prolonging the electrolysis process and its maximum can reach as high as 18.54%. As the current density increasing, the back EMF increases gradually. But when the temperature increases, the back EMF decreases. Although the back EMF increases gradually with prolonging the electrolysis process, it decreases signifcantly with the addition of SrCO_3. Therefore, it is sure that SrCO_3 is decomposed in the electrolysis. According to this, the period and quantity of material feeding in normal production can be determined so as to make the production go on steadily. The preparation of Al-Sr alloys with SrCO_3 as raw materials can not only reduce environment pollation, but also lower the cost of production.