| 十二烷基三甲基溴化铵在磷灰石与钾长石浮选分离中的捕收作用与机理 |
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| 引用本文： | 俞豪勇,朱阳戈,李松清,胡晓星. 十二烷基三甲基溴化铵在磷灰石与钾长石浮选分离中的捕收作用与机理[J]. 矿产保护与利用, 2022, 42(2): 74-79. DOI: 10.13779/j.cnki.issn1001-0076.2022.02.009 |
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| 作者姓名： | 俞豪勇 朱阳戈 李松清 胡晓星 |
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| 作者单位： | 北京矿冶研究总院 矿物加工科学与技术国家重点实验室,北京102628 |
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| 摘 要： | 为了有效去除磷灰石中的长石矿物，考察了季铵盐十二烷基三甲基溴化铵(DTAB)为捕收剂时磷灰石与钾长石的浮选行为，并采用Zeta电位、微量热、XPS、红外光谱和分子模拟等方法研究了药剂在矿物表面的选择性吸附机理。试验结果表明，在矿浆pH值为5~11区间，DTAB对钾长石具有优异的捕收性能，而磷灰石可浮性较差。在DTAB用量为3×10-5 mol/L、pH=9.0时单独浮选钾长石与磷灰石，二者的回收率分别为93%和2%。针对磷灰石与钾长石质量比3:1的人工混合矿，利用DTAB可以获得P2O5品位34.85%、回收率91.46%的磷精矿，其中Al2O3含量为1.52%，表明DTAB可以实现钾长石和磷灰石的选择性分离。机理分析表明，DTAB可以通过静电作用的方式选择性吸附在钾长石表面，其在钾长石表面的吸附能力和作用强度明显高于在磷灰石表面，从而实现了二者的浮选分离。
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| 关 键 词： | 磷灰石 钾长石 浮选 作用机理 捕收剂 十二烷基三甲基溴化铵 |
| 收稿时间： | 2022-04-09 |
Effect and Mechanism of Dodecyl Trimethylammonium Tromide in Flotation Separation of Apatite and Potassium Feldspar |
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| Affiliation: | Beijing General Research Institute of Mining & Metallurgy, State Key Laboratory of Mineral Processing Science and Technology, Beijing 102628, China |
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| Abstract: | In this paper, quaternary ammonium salt dodecyl trimethyl ammonium bromide (DTAB) was used as collector, and the flotation behavior and mechanism of potassium feldspar and apatite in DTAB system were comparatively investigated. The flotation test results of pure minerals show that DTAB has excellent collecting performance for potassium feldspar in the range of pulp pH value from 6 to 11, while apatite has poor floatability. When the dosage of DTAB is 3×10-5 mol/L and the pH is 9.45, the flotation recoveries of potassium feldspar and apatite are 93% and 2% respectively. From the artificial mixed ore with potassium feldspar and apatite in the mass ratio of 3 : 1, the apatite concentrate with P2O5 content of 34.85%, Al2O3 content of 1.52%, P2O5 recovery of 91.46% can be obtained, indicating that DTAB can realize the selective separation of potassium feldspar and apatite. The flotation test results of artificial mixed ore show that DTAB can realize the selective separation of potassium feldspar and apatite. The results of Zeta potential, XPS and FTIR results show that DTAB is selectively adsorbed on the surface of potassium feldspar through physical adsorption, but less on the surface of apatite. Microcalorimetric results show that the reaction between DTAB and potassium feldspar is more intense than that of apatite. The molecular simulation results show that the adsorption effect of dodecyl trimethyl ammonium bromide on potassium feldspar surface is obviously stronger than that on apatite. |
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