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单个粒子的浮选,被认为是由于物理化学的气泡附着引起的,而絮团浮选,看来受其他机理所支配。本研究证明,空气泡的大小,并不影响用下列不同的方法,使其不稳定的无机粒子的浮选效率:(1)加入简单的盐类;(2)加入高分子电解质。在广泛考查的范围内,空气与固体粒子的比率(A/S),并不影响固体粒子的分离效率。然而,对照这两种不稳定的机理时,发现获得最佳的浮选所需的A/S值之间,存在着重大的差别。在等电点处,相应于粒子完全不稳定的高分子电解质的浓度,导致产生最佳的沉积速率;但并未获得最佳的浮选效率。为了通过浮选获得固体物料的最佳分离,必须采用较高的高分子电解质浓度,使固体粒子表面带正电。本文基于不同的絮团结构来阐明这些作用。
Flotation of individual particles is believed to be caused by the physicochemical attachment of bubbles, and floc flotation appears to be dominated by other mechanisms. This study demonstrates that the size of air bubbles does not affect the flotation efficiency of unstable inorganic particles by the following different methods: (1) adding simple salts; (2) adding a polymer electrolyte. In the context of extensive examination, the ratio of air to solid particles (A / S) does not affect the separation efficiency of the solid particles. However, in contrast to these two erratic mechanisms, there is a significant difference between the A / S values found to obtain the best flotation. At the isoelectric point, the concentration of the polymer electrolyte corresponding to the complete instability of the particles results in the best deposition rate; however, the best flotation efficiency is not obtained. In order to obtain the best separation of solid materials by flotation, a higher concentration of the polymer electrolyte must be used to make the surface of the solid particles positively charged. This paper clarifies these effects based on the different floc structure.