[1]周策.添加AlF3 铝熔体除碱热力学分析及其在HX系统中应用[J].福建工程学院学报,2018,16(03):210-214.[doi:10.3969/j.issn.1672-4348.2018.03.002]
　ZHOU Ce.Thermodynamic analysis of alkaline removal of aluminium melt by adding AlF3 and its application in HX system[J].Journal of FuJian University of Technology,2018,16(03):210-214.[doi:10.3969/j.issn.1672-4348.2018.03.002]
点击复制

添加AlF3 铝熔体除碱热力学分析及其在HX系统中应用()
分享到：

《福建工程学院学报》[ISSN:2097-3853/CN:35-1351/Z]

卷:
第16卷
期数:
2018年03期
页码:
210-214
栏目:
出版日期:
2018-06-25

文章信息/Info

Title:
Thermodynamic analysis of alkaline removal of aluminium melt by adding AlF3 and its application in HX system
作者:
周策
福建省南平铝业股份有限公司
Author(s):
ZHOU Ce
Fujian Nanping Aluminum Co., LTD.
关键词:
电解铝液;  碱金属;  氟化铝;  氩气;  HX系统
Keywords:
electrolytic aluminum melt;  alkali metal;  aluminum fluoride;  argon;  HX system
分类号:
TG111.7，TG113.12
DOI:
10.3969/j.issn.1672-4348.2018.03.002
文献标志码:
A
摘要:
针对电解铝液除Na、Ca等碱金属问题，选择用AlF3粉末加氩气作为除碱剂，并开发了HX除碱工艺和设备。热力学分析表明，AlF3与铝熔体中Na、Ca的反应在较大温度范围内可满足反应自由能ΔG＜0的条件，且反应产物不会影响铝熔体成分；HX系统采用旋转喷吹技术可以使AlF3粉末和氩气与铝熔体均匀混合，不仅显著提高了除碱率，而且避免了以往使用氯气造成的环境污染和设备腐蚀等问题；通过工艺研究，获得除碱工艺的最佳处理时间为15 min，最佳处理温度为800 ℃；生产实践表明，处理后Na质量分数可降至1.8×10-6，除Na率为90.9%；平均Ca质量分数可降至0.2×10-6，除Ca率为94%，是一种环保高效的除碱技术。
Abstract:
In order to solve the problem of removing alkali metals such as Na and Ca with electrolytic aluminum solution, AlF3 powder and argon were selected as alkali-removing agents and HX process and equipment were developed for alkali-removing. Thermodynamic analysis results show that Gibbs free energy ΔG＜0 was satisfied for the reaction of AlF3 with Na and Ca over a wide temperature range, and the chemical composition of aluminum melt wouldn’t be changed. The spin rotor technology was used, which dispersed AlF3 powder and Argon in aluminum melt uniformly. It not only increases the rate of alkali removal significantly, but also avoids environmental pollution and equipment corrosion caused by the use of chlorine gas in the past. Process studies obtained the optimal time and temperature of alkaline removal treatment, which were 15min and 800℃ respectively. Application results showed that the sodium level was decreased to 1.8×10-6 and the removal rate was 90.9% on average, and the calcium level was decreased to 0.2×10-6 and the removal rate was 94% on average, which means the new technology is efficient and environment-friendly.

参考文献/References:

[1] 沈海鸥.用电解铝液生产铝合金扁铸锭的熔体净化工艺[J].轻合金加工技术,2009,37(4):13-16.
[2] 迟福全,王立娟,彭先亮. Na元素对铝合金铸造性能的影响[J].轻合金加工技术,2002,30(8):14-15.
[3] TALBOT D, GRANGER D A. Effects of sodium and bismuth in aluminum-magnesium alloys[J]. jom,1995,47(2):44-46.
[4] ZHANG L, L X, TORGERSON A T, et al. Removal of Impurity Elements from Molten Aluminum: A Review[J]. Mineral Processing and Extractive Metallurgy Review, 2011, 32(3): 150-228.
[5] SYLVAIN P. The use of promag N1 at baat Canada inc[C]∥ The 5th International Melt Quality Workshop. Dubai: UEA, 2012.
[6] LANDOLT H. Thermodynamic properties of inorganic materials compiled by SGTE: heat capacities, enthalpies, entropies and Gibbs energies, phase transition data. Pure substances. Subvol. A[M]. Berlin:Springer,1999.
[7] RASCH B, MYRBOSTAD E, HASFAS K. Refining of potroom metal using the Hydro RAM crucible fluxing process[J]. Light Metals, 1998: 851-854.

更新日期/Last Update: 2018-06-25