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Study of Al-Ca Alloy Prepared by Molten Salt Electrolysis Method

Author: CaoWenLiang
Tutor: DiXiuJing；ZhangMingJie
School: Northeastern University
Course: Chemical Engineering
Keywords: Al-Ca alloy Molten salt electrolysis Back-EMF Current efficiency
CLC: TG146.21
Type: Master's thesis
Year: 2009
Downloads: 46
Quote: 0
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Abstract


In this paper, CaCl 2 -CaF 2 binary system and of BaF 2 -CaCl 2 2 -CaF electrolyte, CaO ternary materials, molten salt electrolysis Preparation of Al-Ca alloys to study the molten salt physical and chemical properties, and effects of the electrolysis process parameters. Using the sunken floating two structures electrolyzer, the success of the system to take the aluminum-calcium alloy, alloy Ca concentration up to 14%, higher than the iron and steel smelting the FGD Deoxidizer 5 requirements to fully meet the production needs. The measured the CaCl 2 -CaF is system of BaF 2 -CaF is 2 -CaCl 2 system density, the density of the molten salt with increasing temperature decline; CaO added to molten salt density the CaF 2 and BaF 2 to join will be a significant increase in molten salt density. By differential thermal - thermal gravimetric analysis, determination of the CaCl the 2 -CaF 2 system early crystallization temperature of 640 ° C, BaF 2 -CaF < sub> 2 -CaCl 2 the Liquidus Temperature 710 ° C; continuous changes in the conductivity cell constant (CVCC) Determination of the electrolytic conductivity of the system, liters of electrolyte conductivity with temperature high and increases, decreases with the increase of the added amount of CaO. The study of the physical and chemical properties of the molten salt, lay the foundation for the selection of the electrolyte composition and electrolysis temperature. CaCl 2 -CaF 2 of the electrochemical behavior of the system using cyclic voltammetry to study carbon electrode in the anode to produce chlorine, calcium cathode , there is an intermediate product of CaC 2 to CaCl 2 -CaF 2 system CaO addition, when scanning potential negative The chloride ion deposition potential oxidation current peak of this current the peak oxygen ions O 2 - ion discharge the generated CO 2 current peak. The paper examines the back EMF and current efficiency of the electrolysis temperature, current density and electrolysis time. The research results show that the sunken liquid aluminum electrolytic cell, the counter electromotive force increases with increasing current density in the the CaCl 2 -CaF 2 -CaO electrolysis system gradually increased with the electrolysis time; increased with the pole pitch of the counter electromotive force is increased and decreased with increasing temperature. The current efficiency decreased with increasing temperature, with the current density is first increased decreased, electrolysis time of 1h, the maximum current efficiency was 71%. The results show that the use of liquid aluminum floating electrolyzer, the in of BaF 2 -CaF 2 -CaCl 2 -CaO electrolysis system, back-EMF increases with increasing current density, with the electrolysis time is gradually increased and decreased with increasing temperature. The current efficiency decreased with increasing temperature, with the current density is first increased to reduce the electrolysis time of 1.5h, the maximum current efficiency was 80%. Aluminum-calcium alloy X-ray diffraction analysis showed that, the phase mainly Al and Al 4 Ca, aluminum-calcium alloy scanning electron microscopy analysis showed that the product of alloy composition uniformity.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Aluminum
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