Contribution of ammonium ions to sulfidation-flotation of smithsonite
Contribution of ammonium ions to sulfidation-flotation of smithsonite
复制标题
铵离子对菱锌矿硫化浮选的贡献
DOI：
10.1016/j.jtice.2017.05.015
复制
发表时间：
2017
影响因子：
5.7
通讯作者：
Yin Qiong
中科院分区：
文献类型：
--
作者：
Wu D;an;Ma Wenhui;Wen Shuming;Bai Shaojun;Deng Jiushuai;Yin Qiong
硫化浮选通常用于回收贱金属氧化物矿石。硫化法可能成为氧化锌矿回收锌的关键工艺。以常见的氧化锌矿物为研究对象，采用铵盐强化菱锌矿的硫化浮选。采用微浮选、电感耦合等离子体分析、扫描电镜和X射线光电子能谱等方法研究了铵离子对菱锌矿硫化和浮选的影响。铵盐的加入促进了菱锌矿的浮选，提高了菱锌矿的浮选回收率约25%。不同条件下的溶解度测试表明，菱锌矿在铵离子存在下的表面溶解度显著降低。基于能量色散X射线光谱的半定量分析表明，在铵增强硫化菱锌矿表面上的硫浓度为8.55%，而在硫化菱锌矿表面上的硫浓度为2%。XPS分析表明，菱锌矿在铵离子存在下更容易被硫化钠硫化。因此，添加铵离子可以强化菱锌矿的硫化，改善浮选性能。
Sulfidation-flotation is commonly performed to recover base metal oxide ores. Sulfidation could become the key process in recovering zinc from zinc oxide ores. We investigated the common zinc oxide mineral. An ammonium salt was used to enhance sulfidation-flotation of smithsonite. The effect of ammonium ions on sulfidation and flotation of smithsonite was investigated by microflotation, inductively coupled plasma analysis, scanning electron microscopy, and X-ray photoelectron spectroscopy. Addition of the ammonium salt facilitates flotation of smithsonite and improves the flotation recovery by ∼25%. Solubility tests under different conditions indicate that the surface solubility of smithsonite in the presence of ammonium ions significantly decreases. Energy-dispersive X-ray spectroscopy based semi-quantitative analysis shows that the concentration of sulfur on the ammonium enhanced sulfurized smithsonite surface is 8.55%, whereas that on the sulfurized smithsonite surface is 2%. XPS analysis reveals that smithsonite is more easily sulfurized by sodium sulfide in the presence of ammonium ions. Therefore, ammonium ion addition can be used to enhance sulfidation of smithsonite and improve the flotation performance.