(遼寧科技大學(xué) 材料與冶金學(xué)院，鞍山 114051)
摘 要: 在CaCl2-CaF2體系中，以CaO為電解原料，采用液態(tài)鋁陰極法生產(chǎn)鋁鈣中間合金。采用熔鹽電解監(jiān)控儀測(cè)量電解過(guò)程中的反電動(dòng)勢(shì)、槽電壓、電流等工藝參數(shù)及電解波形圖，通過(guò)電位控制法調(diào)節(jié)CaO的加料周期，同時(shí)根據(jù)所得合金產(chǎn)品中的鈣含量(質(zhì)量分?jǐn)?shù))探討影響電流效率的因素。結(jié)果表明：反電動(dòng)勢(shì)隨電流密度增加而增大，通過(guò)控制電位法測(cè)得加料周期為30 min；在740 ℃、電流為7 A的條件下，電解1 h可制取鈣含量為11.6%的鋁鈣合金，電流效率可達(dá)67.3%。
關(guān)鍵字: 鋁鈣合金；液態(tài)鋁陰極法；反電動(dòng)勢(shì)；電流效率
liquid aluminium cathode method
（School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China）
Abstract:Al-Ca master alloy was prepared by liquid aluminium cathode method, using a mixed molten salt system of CaCl2-CaF2 and feeding CaO as electrolysis material. The technological parameters such as back electromotive force (BEMF), cell voltage, current and electrolysis waveform were measured by testing device of molten salt electrolysis. The feeding period of CaO was adjusted by the method of electric potential control. At the same time, the factor that affects current efficiency was discussed according to the Ca content of alloys obtained. The results indicate that the BEMF increases with current density increasing, the feeding period is measured to be 30 min by the method of electric potential control. Finally, the Al-Ca alloy with the Ca content (mass fraction) of 11.6% can be obtained by electrolyzing for 1 h at the current of 7 A and 740 ℃, and the current efficiency can reach 67.3%.
Key words: Al-Ca alloy; liquid aluminium cathode method; back electromotive force; current efficiency
