Dissolution Patterns of Fe3+ and Mg2+ from the Surfaces of Specularite and Chlorite and Their Effects on Floatability
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摘要:
镜铁矿与绿泥石分选过程中，矿物表面金属离子的溶解会对矿物的可浮性产生影响。利用ICP、电导率和单矿物浮选试验考察了镜铁矿和绿泥石表面离子Fe3+、Mg2+的溶出规律和对可浮性的影响，并结合Zeta电位测试和lgc−pH分析研究了Fe3+、Mg2+对镜铁矿、绿泥石的抑制机理。结果表明：Fe3+、Mg2+会随溶出时间的增加而呈现先增长后减少的趋势，且绿泥石表面Mg2+的溶出量明显高于Fe3+，且随着溶液pH值的升高，溶液中总离子浓度呈现持续降低趋势；Fe3+、Mg2+对镜铁矿和绿泥石均有一定的抑制作用，但Fe3+的抑制效果更强，在Fe3+质量浓度为3.11 mg/L且pH=6的条件下，镜铁矿和绿泥石回收率分别降低至10.23%和13.35%；Fe3+主要以亲水性Fe（OH）3沉淀吸附的形式对矿物产生抑制作用，而Mg2+主要以Mg2+吸附的形式增加了矿物颗粒与十二胺间的静电斥力，造成矿物可浮性下降。
Abstract:During the separation process of specularite/chlorite, the dissolution of metal ions on the mineral surface can affect the floatability of the minerals. Using ICP, conductivity measurements, and single mineral flotation tests, the dissolution patterns of Fe3+ and Mg2+ ions from the surfaces of specularite and chlorite and their effect on floatability were investigated y. Additionally, by combining Zeta potential measurements and lgc−pH analysis, the inhibition mechanisms of Fe3+ and Mg2+ on specularite and chlorite were studied. The results showed that Fe3+ and Mg2+ exhibited a trend of increasing followed by decreasing with dissolution time, and the dissolution amount of Fe3+ from the chlorite surface was significantly higher than that of Fe3+. In addition, the total ion concentration in the solution decreased continuously as the pH of the solution increased. Both Fe3+ and Mg2+ had certain inhibitory effect on specularite and chlorite, but Fe3+ had a stronger inhibitory effect. Under conditions where the Fe3+ concentration was 3.11 mg/L and pH=6, the recovery rates of specularite and chlorite decreased to 10.23% and 13.35%, respectively. Fe3+ primarily inhibits minerals through the adsorption of hydrophilic Fe(OH)3 precipitates, while Mg2+ mainly increases the electrostatic repulsion between mineral particles and DDA through adsorption in the form of Mg2+, resulting in decreased mineral floatability.
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Key words:
- specularite /
- chlorite /
- surface ion /
- flotation /
- inhibition
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表 1 镜铁矿和绿泥石的XRF分析结果
Table 1. XRF analysis results of specularite and chlorite
/% 矿物名称 Fe2O3 SiO2 Al2O3 MgO CaO TiO2 镜铁矿 95.74 3.36 0.382 0.233 0.0361 / 绿泥石 16.35 59.39 12.48 7.35 0.774 1.91 
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