Study on Reverse Flotation Process of Magnesite and Dolomite in Dodecylamine System
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摘要:
通过单矿物浮选实验，研究了在十二胺浮选体系中菱镁矿、白云石的浮选行为及调整剂Fe3+对两种矿物可浮性的影响。依据傅里叶红外光谱（FTIR）、接触角测试研究了Fe3+的作用机理。浮选实验结果表明：十二胺体系中，在矿浆自然pH值条件下，白云石的可浮性优于菱镁矿，菱镁矿与白云石具有一定的浮游差，添加少量的Fe3+显著提升了两种矿物的浮游差。红外光谱测试结果表明：十二胺在白云石、菱镁矿表面的吸附主要是静电吸附，白云石-CH3和-CH2的对称和不对称拉伸振动的峰值增大。接触角测试结果表明：少量Fe3+的加入使得白云石接触角明显增大，疏水性增强，对菱镁矿可浮性影响不大，起到了选择性活化白云石的作用。
Abstract:Through the single mineral flotation test, the flotation behavior of magnesite and dolomite in the dodecylamine flotation system and the influence of the regulator Fe3+ on the floatability of the two minerals were studied. Based on Fourier Infrared Spectroscopy (FTIR) and contact angle test, the mechanism of Fe3+ was studied. The flotation test results show that in the dodecylamine system, under the natural pH condition of the pulp, the floatability of dolomite is better than that of magnesite. There is a certain floatation difference between magnesite and dolomite, and the addition of a small amount of Fe3+ significantly improves the floatation difference of the two minerals. Infrared spectroscopy test results show that the adsorption of dodecylamine on the surface of dolomite is mainly electrostatic adsorption, dolomite CO32− out-of-plane bending vibration and CO32− in-plane bending vibration are almost unchanged, and -CH3 and -CH2 are symmetrical and asymmetrical. The peak value of extensional vibration increases. The contact angle test results show that the addition of a small amount of Fe3+ enhances the hydrophobicity of dolomite, which has the effect of activating dolomite.
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Key words:
- Magnesite /
- Dolomite /
- Reverse flotation /
- Selective activation
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表 1 单矿物化学组分分析/%
Table 1. Chemical analysis of pure minerals
名称 MgO CaO SiO2 Al2O3 FeO 菱镁矿 45.68 1.20 0.80 0.055 0.15 白云石 25.10 35.08 0.55 0.099 0.10 
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