The effects of current frequency, pull-down velocity, holding temperature and crucible materials on the separation efficiency of Al?Si alloy with 45wt% Al were studied which the impurity elements were not considered. The results showed that the mass ratio of silicon to aluminum reduced 0.0939 by using graphite crucible as the container under the conditions of current frequency of 3 kHz, holding-temperature of 1000℃ and pull-down velocity of 10 ?m/s. Holding-temperature had the biggest effect on the removal of silicon in the alloy, under the same conditions, the mass ratio of Si to Al in alloy was 0.11439 at 1500℃. The low frequency alternating current strengthens the electromagnetic stirring to enhance the mass transfer. Reducing the pull-down velocity had an effect on reducing the silicon content in the alloy and can make the separation interface more flat.
Yufeng ZHANG Guoqiang LV Wenhui MA Yun LEI Yunfei HE Guangjie XIE
. Preparation of Low-silicon Aluminum Alloy from High-silicon Aluminum Alloy Melts by Electromagnetic Separation Process[J]. The Chinese Journal of Process Engineering, 2018
, 18(3)
: 582
-589
.
DOI: 10.12034/j.issn.1009-606X.217340
[1]张洪峰，田光辉，熊运昌，等. 铝硅合金铸造新工艺的研究与应用 [J]. 铸造, 2008, 57(9): 892-892.Zhang H F, Tian G H, Xiong Y C, et al. Research and Application of New Casting Technique for Al-Si Alloy [J]. Foundry, 2008, 57(9): 892-892.
[2]张万福. 利用俄罗斯技术建设我国的电热铝硅合金工厂 [J]. 中国有色金属学报, 1998, 8(0): 424-427.Zhang W F. Using of Russian Technology to Build our Country's Electric Aluminum Silicon Alloy Factory [J]. The Chinese Journal of Nonferrous Metals, 1998, 8(0): 424-427.
[3]张卫文，尹志民，赵阳，等. 过共晶高硅铸造铝合金磷—稀土双重变质处理 [J]. 中国有色金属学报，1995, 5(1): 59-62.
Zhang W W, Yin Z M, Zhao Y, et al. Double-Metamorphic Treatment of Phosphorus-rare Earth in Hypereutectic High Silicon Casting Aluminum Alloy [J]. The Chinese Journal of Nonferrous Metals, 1995, 5(1): 59-62.
[4]尤晶. 由电热法生产的一次铝硅合金制取铸造用铝硅合金的研究 [D]. 沈阳: 东北大学, 2008, 5-10.You J. Study of Making Casting Grade Al-Si Alloys with Coarse Al-Si Alloy Produced by Electrothemal Reduction of Aluminous Ore [D]. Shenyang: Northeastern University, 2008, 5-10.
[5]赵劭. 铝硅合金的生产方法 [J]. 铝镁通讯, 2002,0(3): 32-34.Zhao S. Production Methods of Al-Si Alloy [J]. Lv Mei Tong Xun, 2002,0(3): 32-34.
[6]周祥宇. 用一次铝硅合金制取铸造铝硅合金的研究 [D]. 沈阳: 东北大学, 2007, 6-10.Zhou X Y. Study on Casting Al-Si Alloy by Aluminum-Silicon Alloy [D]. Northeastern University, 2007, 6-10.
[7]王耀武，冯乃祥，孙挺，等. 自然沉降法去除铝硅合金中铁相的机制探讨 [J]. 稀有金属, 2010, 34(1): 28-33.Wang Y W, Feng N X, Sun T, et al. Mechanism of Removing Iron Phase in Al-Si Alloy by Natural Deposition [J]. Chinese Journal of Rare Metals, 2010, 34(1): 28-33.
[8]You J, Wang Y W, Feng N X, et al. Preparation of Casting aAlloy ZL101 with Coarse Aluminum-Silicon Alloy [J]. Transactions of Nonferrous Metals Society of China, 2008, 18(1): 116-120.
[9]Xu C L, Jiang Q C. Morphologies of Primary Silicon in Hypereutectic Al–Si Alloys with Melt Overheating Temperature and Cooling Rate [J]. Materials Science & Engineering A, 2006, 437(2): 451-455.
[10]Morita K, Miki T. Thermodynamics of Solar-Grade-Silicon Refining [J]. Intermetallics,2003, 11(11): 1111–1117.
[11]Yoshikawa T, Morita K. Refining of Si by the Solidification of Si-Al Melt with Electromagnetic Force [J]. ISIJ International, 2005, 45(7): 967-971.
[12]Yoshikawa T, Morita K. Removal of B from Si by Solidification Refining with Si-Al Melts [J]. Metallurgical & Materials Transactions B, 2005, 36(36): 731-736.
[13]Yoshikawa T, Morita K. Refining of Silicon During its Solidification from a Si–Al Melt [J]. Journal of Crystal Growth, 2009, 311(3): 776-779.
[14]Nishi Y, Kang Y, Morita K. Control of Si Crystal Growth During Solidification of Si-Al Melt [J]. Materials Transactions, 2010, 51(7): 1227-1230.
[15]Xue H Y, Lv G Q, Ma W H, et al. Separation Mechanism of Primary Silicon from Hypereutectic Al-Si Melts under Alternating Electromagnetic Fields [J]. Metallurgical and Materials Transactions A, 2015,46 (7): 2922-2932.
[16]Lei Y, Sun L E, Ma W H, et al. Enhancing B Removal from Si with Small Amounts of Ti in Electromagnetic Solidification Refining with Al-Si Alloy [J]. Journal of Alloys and Compounds, 2016, 666(0): 406-411.
[17]Li J Y, Ni P, Wang L, et al. Influence of Direct Electric Current on Solidification Process of Al-Si Alloy [J]. Materials Science in Semiconductor Processing, 2017, 61(0): 79-84.
[18]陈杭，王志，池汝安，等. Al-Si合金熔析结晶过程中界面稳定性与硅晶体生长的控制 [J]. 过程工程学报, 2015, 15(3): 435-442.
Chen H, Wang Z, Chi R A, et al. Control of the Stability of Solid-Liquid Interface and Growth of Si Crystal During Solvent Refining Process of A1-Si Alloy [J].The Chinese Journal of Process Engineering, 2015, 15(3): 435-442.
[19]Huang L G, Li G, Fu D J, et al. Effects of Electromagnetic Field on Primary Si Phase of Hypereutectic Al-18%Si Alloy [J]. Journal of Materials Engineering, 2010 , 24 (1): 32-33.
[20]Li P J, Nikitin V I, Kandalov E G, et al. Effect of Melt Overheating Cooling and Solidification Rates on Al-16wt.%Si Alloy Structure [J]. Materials Science and Engineering, 2002, 332(1): 371-374.
