Abstract

Results of turbidimetry study of aggregate stability of binary SiO₂–ZrО₂ sol and its components in 10^–3–10^–1 M KCl solutions at рН 3.4 when ZrO₂ particles have a high positive charge and SiO₂ particles are slightly (close to zero) negatively charged are presented. The ratio of numerical concentrations of sol particles ZrO₂ to SiO₂ was 7.8 : 1. It was found that in binary SiO₂–ZrО₂ sol both the process of heterocoagulation (mutual coagulation) of sols and coagulation of the same oxide particles occur throughout the studied range of KCl concentrations. The way of differentiation of processes of dissimilar SiO₂ and ZrO₂ particles heterocoagulation and coagulation of components is proposed. It is shown that at pH 3.4 the increase in the concentration of KCl solutions in binary SiO₂–ZrО₂ sol leads to a decrease in the intensity of the process of ZrO₂ and SiO₂ particles mutual coagulation, which is explained by the decrease in the radius of action of attraction of dissimilar particles.

中文翻译：

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二元混合溶胶中异质混凝和混凝过程的区别

摘要

当ZrO ₂颗粒具有高正电荷且SiO ₂颗粒略微（接近于）时，在рН3.4处的10 ^–3 –10 ^–1 M KCl溶液中，二元SiO ₂ –ZrО ₂溶胶及其组分的聚集体稳定性的浊度研究零）带负电。溶胶颗粒的ZrO数值浓度比₂与SiO ₂为7.8：1。结果发现，在二进制的SiO ₂ -ZrО ₂在整个研究的KCl浓度范围内，溶胶的异质凝结（相互凝结）过程和相同氧化物颗粒的凝结过程均发生。提出了区分异质SiO ₂和ZrO ₂颗粒的过程以及组分的混凝方法。结果表明，在pH 3.4的增加的KCl溶液的浓度以二进制的SiO ₂ -ZrО ₂溶胶导致以ZrO的处理的强度的降低₂和SiO _2个，其是通过减少在解释颗粒相互凝聚，异种粒子的吸引力作用半径。