论文部分内容阅读
对二氧化钛持续不断地需求,使细粒二氧化钛与二氧化硅的分离成为重要的工业难题。本文研究了如何从水悬浮液中选择性凝聚分离高纯度、人工合成的、微米和亚微米级的二氧化钛微粒。通过胶体稳定性分析选择特定的电解质浓度和悬浮液pH。pH8,电解质浓度20mmol/L条件下,在很大固体浓度范围内从二氧化硅-二氧化钛混合悬浮液(50%∶50%)中有效地分离出二氧化钛(高达99·6%)。数据分析表明,随着固体浓度的增大,分离效率提高,这归因于絮凝物由‘自由”沉降方式向干涉沉降方式转变会影响二氧化硅颗粒向二氧化钛絮聚体内部的捕俘行为。
Continued demand for titanium dioxide, the separation of fine-grained titanium dioxide and silica has become an important industrial problem. This paper studies how to selectively coagulate and separate high purity, synthetic, micron and submicron titanium dioxide particles from aqueous suspensions. The specific electrolyte concentration and suspension pH are selected by colloidal stability analysis. Titanium dioxide (up to 99.6%) was effectively separated from the silica-titania mixed suspension (50%: 50%) at pH 8, electrolyte concentration of 20 mmol / L, over a wide range of solids concentrations. The data analysis shows that the separation efficiency increases with the increase of solid concentration, which is attributed to the change of flocculation from “free” sedimentation mode to interference sedimentation mode, which will affect the capture behavior of silica particles to the inside of titanium dioxide floc.