Effect and Mechanism of Ultrasonic Treatment of Polyacrylamide on Molybdenite Flotation
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摘要:
钼矿浮选过程中会产生大量的选矿废水，为使选矿废水满足回用要求，通常添加絮凝剂——聚丙烯酰胺（PAM）加速微细粒矿泥沉降，使上层清水回用。然而，随着选矿废水回用次数增加，废水中累积的PAM严重抑制辉钼矿浮选，降低其回收率。考察了PAM对辉钼矿浮选行为的影响，探究经超声波处理后含PAM选矿回水对辉钼矿浮选行为的影响规律与机制。结果表明，PAM的存在大幅降低了辉钼矿的表面疏水性，抑制了辉钼矿浮选，其抑制作用随PAM质量浓度增大而增强。经超声波处理后，辉钼矿可浮性回升。5 mg/L PAM溶液在600 W功率下超声波处理9 min后，辉钼矿的浮选回收率达到68.63%。进一步研究表明，溶液中的微气核空化泡在超声波作用下振动，在一定声压下生长和崩溃，并伴随着自由基的产生，可以击碎和氧化降解PAM，使PAM分子链断裂，相对分子质量迅速下降。采用超声波处理含PAM废水，可提高钼矿选矿废水回用率和辉钼矿浮选回收率，同时增加水资源循环利用效率。
Abstract:The flotation process of molybdenum ore produces a large amount of mineral processing wastewater. To make the mineral processing wastewater meet the reuse requirements, the flocculant olyacrylamide (PAM) is usually added to accelerate the settlement of micro−grained slime so that the upper water can be reused. However, the accumulation of PAM in wastewater seriously depresses the flotation of molybdenite and reduces its recovery with the increase in the recycling times of mineral processing wastewater. The influence of PAM on molybdenite flotation behavior was investigated, and ultrasonic crushing technology was used to treat the mineral return water containing PAM. The influence rule and mechanism of the mineral return water containing PAM after ultrasonic treatment on the flotation behavior of molybdenite were investigated. The results showed that the presence of PAM greatly reduced the surface hydrophobicity of molybdenite and depressed the flotation of molybdenite, and the depression effect was enhanced with the increase of PAM mass concentration. The floatability of molybdenite recovered after PAM was treated by ultrasound. The flotation recovery of molybdenite reached 68.63% after 5 mg/L PAM solution was ultrasonic treated for 9 min at 600 W power. Further study showed that the micro−gas nucleated cavitation bubbles in solution vibrate under ultrasonic, grow and collapse under a certain sound pressure. It is accompanied by the production of free radicals, which can crush and oxidize and degrade PAM, and the molecular weight of PAM decreased rapidly. Treatment of PAM by ultrasonic crushing technology could improve the reuse rate of molybdenum ore dressing wastewater, the flotation recovery of molybdenite, and the recycling efficiency of water resources.
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Key words:
- molybdenite flotation /
- mineral return water /
- polyacrylamide /
- ultrasonication
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