Refining of electrolytic aluminum liquid and effects on conductivity and mechanical properties of primary aluminum
With the development of power industry and the increase of electricity demand,the preparation of high-strength and high-conductivity aluminum wires is one of the effective ways to improve transmission efficiency and transmission capacity.Compared with other materials,electrical pure aluminum has the advantages of low cost and simple production process,but its strength is low,followed by the impurity elements in the primary aluminum which result in low conductivity.The refining process of electrolytic aluminum is crucial for enhancing its purity and optimizing its performance.Therefore,electrolytic aluminum liquid ingot was used as raw material,the impact of adding fluoride refining agents and boriding agent into the electrolytic aluminum liquid during refining process on the electrical and mechanical characteristics of primary aluminum was examined,as well as the concentration of metal impurities in the aluminum liquid were studied.The results show that after adding fluoride refining agent,the pri-mary aluminum resistivity can be decreased to 27.46 nΩ·m,the tensile strength can be elevated to 58.29 MPa,and the elongation can be boosted to 45.24％.The use of boriding agent clearly diminishes the presence of V element.At boron level of 0.08％,the removal rate of V element is 94.2％.Using both refining agent and boriding agent may effectively decrease the resistivity of primary aluminum while enhance its tensile strength and elongation simul-taneously.Under the testing condition,the average resistivity of electrolytic aluminum falls by 7.54％after refine-ment,while the average tensile strength improves by 35.60％and the average elongation increases by 64.84％,The properties of as-cast primary aluminum are better than those of traditional aluminum melt refining process.The re-search results can provide a reference for the processing of primary aluminum and aluminum profiles for remelting and the aluminum rod industry for electrical round.
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