From a physical point of view, solid-liquid mixing is a three–phase system consisting of a solid, the surrounding atmospheric gas phase and a liquid. If a liquid is in contact with a moving solid mixture, the quantity of liquid and its dispersibility determine the extent to which the individual particles are wetted. The dispersibility of a liquid is mainly dependent on the following physical properties: Surface tension and viscosity of the liquid, porosity of the solid, affinity of the solid and liquid phase (lipophilic – hydrophilic), as well as the efficiency of the material distribution.
Applications
Suspension of solids in liquids, such as powders, granulates or bulk materials, is a complex process that is used in many industries. In the pharmaceutical industry, for example, tablet coating materials are produced by the incorporation of solids into aqueous solutions. The preparation of Suspensions of colour pigments is one of the typical applications in the production of dyes.
Other common applications are the production of:
Details
When mixing solid and liquid substances, it is important that the entire quantity of the solid substance is incorporated into the liquid. No residual quantities should remain in the supply containers and feed pipes. Likewise, the solid substance should not swirl up and adhere to the inside of the container lid. The suspended solid should then be homogenously distributed, not combine to form Agglomeration and not form sediment on the bottom of the vessel.
Suitable mixing vessels solve this by means of powder induction with a pre-mixing section without re-wetting of the solids and agitators, which apply a sufficient flow velocity to each part of the mixing vessel to achieve the above-mentioned objectives. Depending on the raw material and the process, however, a detailed technical design in advance is also necessary here to achieve subsequent optimal production conditions. We will be pleased to advise you on the subject of solid-liquid mixing.
Liquid raw material components are optimally dosed by means of our Dosing Station.
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Frequently Asked Questions about solid-liquid mixing
What is solid-liquid mixing?
A process in which solids such as powders or granules are wetted and mixed, homogenized and dispersed in one passage. It avoids typical problems of conventional agitation.
Which problems does the process avoid?
Agglomerates, air intake, dust, solvent emissions, sticking to the agitator, quality deviations and raw material losses. This saves time as well as personnel, cleaning, disposal and energy costs.
What does wetting of the solid depend on?
On surface tension and viscosity of the liquid, porosity of the solid, affinity of the phases (lipophilic/hydrophilic) and the efficiency of material distribution.
How can powder be incorporated dust-free?
For example via powder induction with a pre-mixing section without re-wetting, combined with agitators that provide sufficient flow throughout the vessel – matched to raw materials and process.