混合矿物絮凝过程中选择性的降低是由以下一个或几个因素引起的:溶解离子的干扰,异质凝聚,絮凝体中的机械夹杂及絮凝体之间微细粒的污染.由磷灰石—白云石体系的研究可以断定:溶解的离子对选择性无明显的影响,异质凝聚可借助于选择适当地工艺条件和添加分散剂办法使其降到最低限度。机械夹杂影响也是不显著的,而且可以通过选择一种适当的使絮凝体和细粒分离的方法来尽量减少其影响。有一种称为“聚合物诱导夹杂”的新因素,该因素是由于聚合物对不絮凝矿物有一定引力而产生的,它也是公认的降低选择性的原因之一。 The selective reduction of mixed minerals during flocculation is caused by one or more of the following factors: interference of dissolved ions, heterogeneous agglomeration, mechanical inclusions in the flocs, and fouling of fines between the flocs by apatite- Dolomite system studies concluded that dissolved ions have no significant effect on selectivity and that heterogeneous agglomeration can be minimized by the choice of appropriate process conditions and the addition of dispersants. The effects of mechanical inclusions are also insignificant and can be minimized by selecting a suitable method of separating the flocs from the fines. There is a new factor called “polymer-induced inclusions”, which is one of the reasons why the selectivity is reduced due to the polymer’s attraction to non-flocculated minerals.