电渣精炼去除铝中夹杂物的研究
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摘要
采用电渣精炼法去除工业纯铝中的夹杂物,研究了电渣精炼去除夹杂物的效果及机理。结果表明,工业纯铝中夹杂物的去除效率随着电渣重熔速率的减小不断提高;当电渣重熔速率为108g·min~(-1)时,夹杂物的去除效果最佳,达到97.6%。在电渣精炼过程中,工业纯铝中的夹杂物被熔融渣剂所捕获。夹杂物-铝熔体-熔融渣剂体系的吉布斯自由能计算结果表明,在铝熔滴中的夹杂物具有从铝熔体中自发迁移到熔融渣剂中的趋势。
Experiments of removing non-metallic inclusions from commercial pure aluminum were conducted with a laboratory-scale apparatus by electroslag refining.The results show that the removal efficiency of inclusions by relectroslag refining is increased with the decrease of remelting rate.Under the remelting rate of 108 g·min~(-1),the removal efficiency can reach 97.6%.The reaction of the molten slag to capture inclusions accounts for the removal of inclusions in the refining process.It is explained thermodynamically by the Gibbs energy calculation that inclusions can transfer spontaneously from the aluminum melt to the molten slag.
Experiments of removing non-metallic inclusions from commercial pure aluminum were conducted with a laboratory-scale apparatus by electroslag refining.The results show that the removal efficiency of inclusions by relectroslag refining is increased with the decrease of remelting rate.Under the remelting rate of 108 g·min~(-1),the removal efficiency can reach 97.6%.The reaction of the molten slag to capture inclusions accounts for the removal of inclusions in the refining process.It is explained thermodynamically by the Gibbs energy calculation that inclusions can transfer spontaneously from the aluminum melt to the molten slag.
引文
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[13]李正邦.电渣冶金的理论与实践[M].北京:冶金工业出版社,2010.
[2]徐征兵,王文超,庞志兴,等.夹杂物对工业纯铝组织性能的影响[J].铸造,2009,58(8):827-830.
[3]孙金根,张颖,张嘉男,等.基于BP神经网络的铝液夹杂物预测[J].控制工程,2016,23(10):1 519-1 522.
[4]LI K,WANG J,SHU D,et al.Theoretical and experimental investigation of aluminum melt cleaning using alternating electromagnetic field[J].Materials Letters,2002,56:215-220.
[5]HE Y J,LI Q L,LIU W.Effect of combined magnetic field on the eliminating inclusions from liquid aluminum alloy[J].Materials Letters,2011,65:1 226-1 228.
[6]HUANG L W,WANG P W,SHI T S,et al.Effect of degassing treatment on the quality of Al-7Si and A356 melts[J].Materials Transactions,2002,43:2 913-2 920.
[7]DAMOAH L N W,ZHANG L.Removal of inclusions from aluminum through filtration[J].Metallurgical and Materials Transactions,2010,B41(4):886-907.
[8]XU Z M,LI T X,ZHOU Y H.Continuous removal of nonmetallic inclusions from aluminum melts by means of stationary electromagnetic field and DC current[J].Metallurgical and Materials Transactions,2007,A38:1 104-1 110.
[9]田世江.电渣技术在我国铸造业中的应用[J].特种铸造及有色合金,2000(3):50-52.
[10]王大威,侯桂丹,王安国,等.GH132高温合金炉底辊电渣熔铸工艺实践[J].铸造,2011,60(8):811-813.
[11]ZHOU M,SHU D,LI K,et al.Performance improvement of industrial pure aluminum treated by stirring molten flues[J].Materials Science and Engineer,2003,A347:280-290.
[12]周鸣.铝熔体中夹杂物和氢的去除研究[D].上海:上海交通大学,2003.
[13]李正邦.电渣冶金的理论与实践[M].北京:冶金工业出版社,2010.