Song Ningbo, Yin Wanzhong, Xie Yu, Yao Jin
School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China.
State Key Laboratory of Mineral Processing Science and Technology, Beijing 100160, China.
Langmuir. 2024 Aug 13. doi: 10.1021/acs.langmuir.4c01457.
The effect of seawater on the flotation of sulfide minerals is a hot research topic at the present. Using seawater instead of fresh water to separate lead-sulfur can save fresh water resources and reduce lime consumption, which has broad prospects in terms of economic and environmental protection. Many studies have shown that divalent calcium and magnesium ions in seawater are hydrolyzed to form hydroxyl complexes under alkaline pH values, which affects the flotation separation of sulfide ore. In this paper, the flotation separation of galena and pyrite in seawater was tested, and the mechanism was analyzed. Compared with that in deionized water, the lead grade of concentrate in seawater flotation increased from 57.40 to 60.20%. Meanwhile, the recovery of galena declined from 68.66 to 61.17%, and the SI value increased from 2.020 to 2.072. With the addition of SHMP, SS, and EDTA, the SI value increased from 2.072 to 2.609, 2.525, and 2.287, respectively. Noteworthily, when EDTA was excessive, the grade of Pb was 69.60%, and the SI value was 3.050. Wettability analysis, zeta potential analysis, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, density functional theory calculation, and E-DLVO calculation verified the microflotation results and revealed the mechanism of action.
海水对硫化物矿物浮选的影响是目前的一个热门研究课题。用海水代替淡水进行铅硫分离可节约淡水资源并减少石灰用量，在经济和环境保护方面具有广阔前景。许多研究表明，海水中的二价钙和镁离子在碱性pH值下会水解形成羟基络合物，这会影响硫化矿的浮选分离。本文对海水中方铅矿和黄铁矿的浮选分离进行了试验，并分析了其机理。与在去离子水中相比，海水浮选中精矿的铅品位从57.40%提高到60.20%。同时，方铅矿的回收率从68.66%下降到61.17%，SI值从2.020提高到2.072。添加SHMP、SS和EDTA后，SI值分别从2.072提高到2.609、2.525和2.287。值得注意的是，当EDTA过量时，Pb品位为69.60%，SI值为3.050。润湿性分析、zeta电位分析、X射线光电子能谱、傅里叶变换红外光谱、密度泛函理论计算和E-DLVO计算验证了微浮选结果并揭示了作用机理。
