液体锌镍合金表面覆盖复合盐的研究与应用

Research and Application of Covering Compound on the Surface of Liquid Zn-Ni Alloy

生产锌镍合金的主要工艺是将镍片加入锌液中,在700℃的温度下搅拌锌液使金属镍溶解在锌液中形成锌镍合金。在高温下搅拌锌液,使金属锌氧化严重,产生的烟尘不仅污染环境、降低金属的回收率,而且使生产难以顺利进行。对CaCl2-NaCl-KCl混合盐的结晶温度、密度、热稳定性等物理性质和相关的化学性质进行分析,通过试验验证混合盐是否满足其作为保护剂覆盖在液体锌镍合金表面。结果表明,CaCl2∶NaCl∶KCl=8∶3∶1的比例混合成三元溶液时,在700℃的温度下,以液体形态覆盖在锌镍合金表面,使液体锌镍合金与空气完全隔离,起到了锌镍金属不被氧化的效果。技术已经成功应用于生产实践中,解决了一项重要的生产难题。

The main technology of producing Zn-Ni alloy is that nickel pieces are added to liquid zinc and the zinc molten liquid are stirred at 700℃ to make nickel dissolve into zinc. However, stirring at elevated temperature makes zinc oxidize seriously, and smoke and dust produced in the process not only pollutes environment and reduces the rate of retrieved metals, but also can not make normal production carry on smoothly. The paper mainly study physicochemical properties of the compound of CaCl2-NaCl-KCl＇s, and it was verified whether it can be used as preventing compound on the surface or liquid Zn-Ni alloy by experiments. The results show that the compound exists as liquid at 700℃ to cover the surface of liquid Zn-Ni alloy and can separate liquid Zn-Ni alloy from air, thus prevent oxidization of metals when CaCl2 ： NaCl ： KCl = 8 ： 3 ： 1. This technology has been successfully used in production and has tackled a difficult problem of the production.