Abstract:

Solid-liquid two-phase mixing technology is an important operation technology in industrial and agricultural production applications, which is widely used in solid dispersion, dissolution and leaching, crystallization and precipitation, solid catalytic reaction, powder pesticide mixing, and so on. The uniformity of the solid-liquid two-phase mixing has an important influence on the production or application of products. Therefore, the research status of solid-liquid two-phase mixing technology is reviewed in this paper. Firstly, the dispersion mechanism of solid particles in the liquid phase is introduced. Then, two common solid-liquid two-phase mixing methods are discussed—chemical dispersion and physical dispersion. The chemical dispersion method includes adding surfactants and coupling agents or electrochemical modification. Physical dispersion methods include mechanical mixing which using stirred tanks, impinging stream mixers, jet mixers, static mixers, and dynamic mixers, as well as ultrasonic dispersion, and electrostatic dispersion which can be used to pre-dispersion. At the same time, some representative detection methods of solid-liquid two-phase dispersion and mixing uniformity are introduced, such as using probes, image analysis and processing, ultrasonic attenuation and dynamic light scattering, electrical resistance tomography, etc. Finally, based on the analysis of existing problems, the future development of solid-liquid two-phase mixing technology in the direction of diversification and intelligence has been prospected.

Key words: binary mixture, mixing, chemical dispersion, physical dispersion, mixing uniformity detection

摘要：

固液混合技术是广泛应用于工农业生产中固体分散、溶解和浸出、结晶和沉淀、固体催化反应以及粉剂农药混合等领域的一种重要操作技术。固液两相混合的均匀性对产品的生产或应用有着重要的影响。因此本文综述了固液两相混合技术的研究现状。首先介绍了固体颗粒在液相中的分散机理，讨论了常见的两大类固液两相混合方法，即化学分散法与物理分散法。其中化学分散法包括添加表面活性剂与偶联剂以及进行电化学改性；物理分散法包括使用搅拌釜、撞击流混合器、射流混合器、静态混合器、动态混合器进行的机械混合以及超声分散和通过静电分散进行的预分散。同时介绍了部分具有代表性的固液两相分散混合均匀性的检测方法，如探针、图像分析处理、超声衰减、动态光散射、电阻层析成像等。最后在分析现有问题的基础上对固液两相混合技术未来在多元化、智能化方向上的发展进行了展望。

关键词: 二元混合物, 混合, 化学分散, 物理分散, 混合均匀性检测