Optimizing the addition of flocculants for recycling mineral-processing wastewater
Optimizing the addition of flocculants for recycling mineral-processing wastewater
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DOI：
10.1080/12269328.2015.1099478
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发表时间：
2016-03
影响因子：
1.7
通讯作者：
J. Park;Chamteut Oh;Young-Soo Han;S. Ji
中科院分区：
文献类型：
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作者：
J. Park;Chamteut Oh;Young-Soo Han;S. Ji
摘要矿物加工需要大量的水，但水在采矿现场是有限的。因此，回收选矿废水而不对回收率和浮选品位产生负面影响的技术至关重要。在若干水再循环技术中，测试了使用阴离子聚合物的絮凝用于再循环矿物加工废水，因为矿物加工废水再循环的主要问题是减少悬浮颗粒。采用间歇圆筒试验来评估絮凝剂的最佳添加量，并测量沉降速率、浊度和絮凝物尺寸作为脱水性能的指标。絮凝剂的添加量增加，由于絮凝体尺寸的增加，沉降速率增加。然而，浊度并没有通过增加絮凝剂的浓度来改善，因为颗粒表面上的聚合物涂层阻止了颗粒的有效桥接。此外，过度使用絮凝剂可能会降低水质并产生不必要的成本。因此，根据选矿废水的性质确定最佳絮凝剂浓度是非常重要的。
Abstract Mineral processing requires large volumes of water, but water is limited at mining sites. Therefore, techniques to recycle mineral-processing wastewater without negative effects on recovery and flotation grade are critical. Among a number of technologies to recycle water, flocculation using an anionic polymer was tested for recycling mineral-processing wastewater, as a major issue in mineral-processing wastewater recycling is to reduce suspended particles. A batch cylinder test was employed to evaluate the optimum amount of flocculant to add and settlement rate, turbidity, and floc size were measured as indications of dewaterability. Adding increasing amounts of flocculant increased the sedimentation rate due to the increased floc size. However, turbidity did not improve by increasing the concentration of flocculant because the polymer coating on the particle surface prevented efficient bridging of particles. In addition, excess use of flocculant may degrade water quality and produce unnecessary costs. Therefore, it is important to identify the optimum flocculant concentration for treating mineral-processing wastewater based on the properties of the water.