摘要
采用区域熔炼法对高纯锌的制备进行了研究。估算了锌中主要杂质在锌熔点附近的平衡分配系数,分别为k0,Fe=474,k0,Cu=1.12,k0,Cd=0.15,k0,Pb=1.17×10-2。通过参考Sp im数学模型,分析了在区熔提纯中熔区长度对区熔提纯效率的影响,获得每次通过时的最优熔区长度,并考察了区熔次数、熔区长度对提纯效率的影响。通过辉光放电质谱仪对杂质进行分析,结果表明：在高纯氩气流动保护下,控制熔区移动速率为3 cm·h-1,熔区长度为50 mm,区熔20次后,杂质总量从1.006μg·g-1降低到0.303μg·g-1,纯度达到6N7（99.99997%）。采用第1~6次为70~80 mm,第7~10次为50~60 mm,第11~20次为30~40 mm的变化熔区长度,杂质总量可降低到0.216μ·gg-1,即采用变化熔区比不变熔区的提纯效果好,产品锌的纯度为6N8（99.99998%）,满足了半导体和光电材料的应用要求。
A process of purification of high purity zinc by zone refining was studied.Distribution coefficient of main impurities in raw zinc was calculated,the results were that k0,Fe=474,k0,Cu=1.12,k0,Cd=0.15,k0,Pb=1.17×10-2.An optimum zone length for maximum separation in multi-pass zone refining was found by Spim′s numerical model and simulation.Glow discharge mass spectrometry（GDMS） analysis was used to measure impurity elements.The results showed that zinc purifying by zone refining was feasible.After 20 passes,most impurities were reduced from 1.006 μg·g-1 to 0.303 μg·g-1,and the purity reached the level of 6N7（99.99997%）.The optimum zone length for maximum separation in multi-pass zone refining was 70~80 mm for first six zone passes,followed by 50~60 mm up to tenth pass and 30~40 mm for passes greater than ten.The amount of impurities were reduced to 0.216 μg·g-1 under the optimal zone length.The purity reached the level of 6N8（99.99998%）,which could satisfy the demand of semiconductor and electronic and optical device.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2011年第4期537-542,共6页
Chinese Journal of Rare Metals
关键词
区域熔炼
高纯锌
提纯
zone refining
high purity zinc
purification
