Polyacrylamides (PAM) are used as flocculants in the copper-molybdenum mining industry to improve the settling rate of flotation tailings. These types of reagents are recirculated to flotation in the water that is recovered from the thickeners, and as a result of this practice they can cause depression of flotation of some important minerals such as molybdenite. The objective of this work was to study the effect of a PAM of 11.9% of degree of anionicity on the flotation of molybdenite. The effect of the anionic PAM on molybdenite flotation was studied under different levels (three) of flocculant mechanical shearing. The flotation data was discussed along with intrinsic viscosity, adsorption, induction time, and electrophoretic mobility measurements. It was found that the non-sheared PAM (NS–PAM) had the strongest depressing effect on molybdenite flotation, followed by the moderately sheared PAM (MS–PAM). The depressing effect of the strongly sheared PAM (SS–PAM) was negligible. The flotation data correlated with the induction time measurements that showed that molybdenite became more hydrophilic in the presence of the NS–PAM. The SS–PAM has no effect on the induction times. Further work is ongoing to understand the effect of PAM on molybdenite flotation in the presence of clay minerals and different aqueous media.

中文翻译：

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机械剪切条件不同的低阴离子聚丙烯酰胺存在下的辉钼矿浮选

聚丙烯酰胺（PAM）在铜钼采矿业中用作絮凝剂，以提高浮选尾矿的沉降速率。这些类型的试剂在从增稠剂回收的水中再循环至浮选，由于这种做法，它们可能导致某些重要矿物质（如辉钼矿）的浮选下降。这项工作的目的是研究阴离子度为11.9％的PAM对辉钼矿浮选的影响。在不同水平（三种）的絮凝剂机械剪切作用下，研究了阴离子PAM对辉钼矿浮选的影响。讨论了浮选数据以及特性粘度，吸附，诱导时间和电泳迁移率测量。结果发现，未剪切的PAM（NS–PAM）对辉钼矿浮选的抑制作用最强，其次是中等剪切的PAM（MS–PAM）。强剪力PAM（SS–PAM）的压抑作用可忽略不计。浮选数据与诱导时间的测量结果相关，表明在NS-PAM存在下，辉钼矿的亲水性更高。SS-PAM对诱导时间没有影响。正在进行进一步的工作以了解在粘土矿物和不同水性介质存在下PAM对辉钼矿浮选的影响。SS-PAM对诱导时间没有影响。正在进行进一步的工作，以了解在粘土矿物和不同水性介质存在下，PAM对辉钼矿浮选的影响。SS-PAM对诱导时间没有影响。正在进行进一步的工作以了解在粘土矿物和不同水性介质存在下PAM对辉钼矿浮选的影响。