循环水中的 Ca2+/Mg2+ 离子对氧化铁反浮选特性的影响

Min Tang, Yan Wu, Jiahao Fu
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引用次数: 0

摘要

水质,尤其是硬度,在影响矿物可浮性方面起着重要作用,因为它会干扰矿物表面的化学/电化学特性及其与浮选试剂的相互作用。当水源中的钙或镁离子分布不同时,它可能会变得难以预测。本研究旨在通过一系列台架/微浮选试验、ZETA电位、粉末接触角和傅立叶变换红外光谱(FTIR)等,确定循环水中的 Ca2+/Mg2+离子对铁氧化物阳离子反浮选选择性的作用。结果表明,使用回收尾矿水会降低浮选选择性并稀释精矿。这主要归因于高浓度 Ca2+ 离子的存在,因为它们会导致铁回收率下降和二氧化硅含量增加,而 Mg2+ 离子含量的增加似乎对精矿质量影响不大。微浮选、粉末接触角、zeta 电位和傅立叶变换红外光谱的数据证明,石英上由 Ca(OH)+ 或 CaCO3(s)等 Ca 基水解化合物形成的亲水胶体层会改变石英的 zeta 电位,干扰其与阳离子捕收剂的相互作用。它们还可能通过预先锁定淀粉残余物上的酸性基团并收缩其构型,从而阻止其在矿物表面的吸附,从而起到削弱赤铁矿上淀粉絮凝的作用。不过,镁离子似乎有利于加强淀粉在赤铁矿上的絮凝作用,因为镁基物质可以充当淀粉和矿物表面之间的吸附桥。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of Ca2+/Mg2+ ions in recycled water on the reverse flotation properties of iron oxides
Water quality, particularly hardness, plays an important role in affecting the floatability of minerals as it interferes with the chemical/electro-chemical characteristics of mineral surfaces and their interactions with flotation reagents. It could become unpredictable when water sources characterized by different calcium or magnesium ion distributions were involved. This study aimed to identify the role of Ca2+/Mg2+ ions in the recycled water on the cationic reverse flotation selectivity of iron oxides through a series of bench/micro flotation tests, zeta potential, powder contact angle, and Fourier Transform Infrared (FTIR), etc. The results pointed out that the use of recycled tailing water deteriorates the flotation selectivity and dilutes the concentrates. This can be largely attributed to the presence of Ca2+ ions at higher concentrations as they induce a drop in the Fe recovery and an increase in SiO2 content while an increase in the content of Mg2+ ions seems to have little effect on the quality of concentrate. As evidenced by the data from micro-flotation, powder contact angle, zeta potentials, and FTIR, a hydrophilic colloidal layer formed by Ca-based hydrolyzed compounds, such as Ca(OH)+ or, CaCO3(s), etc., on quartz could change its zeta potentials and disturb its interactions with a cationic collector. They also play a role in weakening the flocculation of starch on hematite probably by pre-locking the acidic groups on the starch remnants and contracting their configurations, thus preventing their adsorption on mineral surfaces. However, magnesium ions seem to be beneficial to in strengthening the flocculation of starch on hematite as magnesium-based species could act as adsorption bridges of between starch and mineral surfaces.
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