Preparation of Al-Si Alloy with Low Concentration of Boron and Phosphorus by Molten Salt Electrolysis of Silica

doi:10.12068/j.issn.1005-3026.2019.09.015

Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (9): 1298-1304.DOI: 10.12068/j.issn.1005-3026.2019.09.015

• Materials & Metallurgy • Previous Articles Next Articles

Preparation of Al-Si Alloy with Low Concentration of Boron and Phosphorus by Molten Salt Electrolysis of Silica

GUAN Jin-zhao¹， LIU Ai-min^1,2， XU Jun-li³， SHI Zhong-ning^1,2

1. School of Metallurgy， Northeastern University， Shenyang 110819， China; 2. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral， Ministry of Education， Northeastern University， Shenyang 110819， China; 3. School of Sciences， Northeastern University， Shenyang 110819， China.

Received:2018-10-08 Revised:2018-10-08 Online:2019-09-15 Published:2019-09-17
Contact: SHI Zhong-ning
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Abstract

Abstract: Low-boron(B)/phosphorus(P)Al-Si alloys were prepared by electrolysis of silica in cryolite melts at 960℃ using high-purity graphite and Fe-Ni alloy as anodes. The effects of current density and the addition amount of silica to the melts on current efficiency， cathode composition， and impurity(B and P)contents were investigated. The phase composition and microstructure of the cathode product were characterized by XRD and SEM. The results showed that when using graphite anode， the silicon contents in the cathode product increased from 0.75% to 15.17% as the current density increased from 0.5A/cm² to 0.9A/cm²， and the current efficiency increased from 2.58% to 38.06%. The minimum contents of B and P were 3 ×10^-6 and 7×10^-6， respectively. Using Fe-Ni alloy anode， the silicon contents in the cathode product increased from 3.19% to 19.86%， and the current efficiency increased from 12.43% to 70.48% when the addition amount of silica increased from 2% to 6%. The minimum contents of B and P were 6×10^-6 and 11×10^-6， respectively. The phase compositions of the cathode product were Al， Si， and Al-Si alloy.

Key words: molten salt electrolysis, cryolite, silica, boron and phosphorus, Al-Si alloy

CLC Number:

TG146.2

GUAN Jin-zhao， LIU Ai-min， XU Jun-li， SHI Zhong-ning. Preparation of Al-Si Alloy with Low Concentration of Boron and Phosphorus by Molten Salt Electrolysis of Silica[J]. Journal of Northeastern University Natural Science, 2019, 40(9): 1298-1304.

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Preparation of Al-Si Alloy with Low Concentration of Boron and Phosphorus by Molten Salt Electrolysis of Silica

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