Mg2+，Al3+和Fe3+对氟磷灰石表面性质的影响

doi:10.3969/j.issn.1001-1803.2023.03.002

摘要/Abstract

摘要：

矿物表面性质是影响其分散聚集和浮选行为的主要因素，通过溶液化学分析计算、浊度、接触角及Zeta-电位测试分析，研究了矿浆中，Mg²⁺，Al³⁺，Fe³⁺等金属离子对氟磷灰石（FAP）表面性质的影响。结果表明：金属离子在溶液中的存在形式随pH值的变化而改变，FAP是亲水性矿物，添加Fe³⁺对FAP的润湿性影响受pH的影响较大，在酸性环境中，Fe³⁺对FAP的亲水起促进作用，在中性及碱性环境下，Fe³⁺能较好地抑制FAP的亲水。Mg²⁺和Al³⁺受pH的影响较小，在中性环境下Mg²⁺，Al³⁺离子均抑制FAP的润湿性。在pH=3~11范围内，Mg²⁺主要以+2价的离子存在，压缩FAP表面双电层；Al³⁺和Fe³⁺主要是通过水解的作用生成氢氧化物沉淀覆盖在FAP表面，并且Mg²⁺，Al³⁺，Fe³⁺均会破坏FAP的分散性，促使FAP发生聚沉现象。

关键词: 磷矿, 氟磷灰石, 润湿性, 分散性, 金属离子, 表面性质

Abstract:

Phosphate rock flotation is a widely used method in phosphate rock processing in which aimed minerals are selectively separated from gangue minerals based on the difference in surface wettability. Due to its associated minerals in phosphate rock, there is always a lot of Mg²⁺, Al³⁺ and Fe³⁺ in phosphate rock slurry. The existence of metal ions, whose forms are changed with slurry pH, can affect the flotation operation by adsorption on the mineral surface. The surface properties of minerals are the main factors affecting their dispersion, aggregation, and flotation behavior. Herein, the influences of unavoidable metal ions, including Mg²⁺, Al³⁺ and Fe³⁺, on the surface properties of fluorapatite （FAP） in pulp were studied by solution chemical calculation, turbidity, contact angle and Zeta-potential test. The results showed that the forms of metal ions in solution vary with pH. FAP is a hydrophilic mineral, and the influence of adding Fe³⁺ ions on the wettability of FAP was greatly affected by pH. In acidic environment, Fe³⁺ ions could promote the hydrophilicity of FAP, while in neutral and alkaline environment, Fe³⁺ ions could inhibit the hydrophilicity of FAP. The effects of Mg²⁺ and Al³⁺ ions were less affected by pH, and both Mg²⁺ and Al³⁺ ions inhibited the wettability of FAP in neutral environment. In the range of pH 3-11, Mg²⁺ mainly existed as divalent ions, which compressed the double layer on the FAP surface. Al³⁺ and Fe³⁺ mainly generated hydroxide precipitation through hydrolysis to cover the surface of FAP. Mg²⁺, Al³⁺ and Fe³⁺ ions would destroy the dispersity of FAP and promote the coagulation of FAP.

Key words: phosphate rock, fluorapatite, wettability, dispersibility, metal ion, surface property

中图分类号:

TQ423.12

姜春燕, 敖先权, 曹阳, 陈鸿, 李松鸿. Mg²⁺，Al³⁺和Fe³⁺对氟磷灰石表面性质的影响[J]. 日用化学工业（中英文）, 2023, 53(3): 253-259.

Jiang Chunyan, Ao Xianquan, Cao Yang, Chen Hong, Li Songhong. Effects of Mg²⁺, Al³⁺ and Fe³⁺ on the surface properties of fluorapatite[J]. China Surfactant Detergent & Cosmetics, 2023, 53(3): 253-259.

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Mg²⁺，Al³⁺和Fe³⁺对氟磷灰石表面性质的影响

Effects of Mg²⁺, Al³⁺ and Fe³⁺ on the surface properties of fluorapatite

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