I would like to ask everyone how to keep calcium carbonate suspended in water
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I want calcium carbonate particles to remain suspended in water for a long time; I’m not sure what method would work best. Please provide some methods
This post was last edited by hgjoys on 2009-12-31 at 22:41. When conducting filtration experiments, we use an aqueous suspension of calcium carbonate; to keep it suspended, an appropriate stirrer is used for continuous mixing in order to maintain a uniform concentration. Are there any specific requirements for your suspension? Does it mean that some kind of surfactant needs to be added to keep it suspended naturally? Please explain.
It is best to stir, or else use a particle with a smaller diameter together with calcium carbonate, so that the effect of water molecules can counteract gravity and increase the suspension time
The most direct and effective method is stirring; it is also possible to consider using a solute with a higher specific gravity to increase the density of the water, provided that this solute can be removed easily.
Thank you to all fellow sailors! I want to prepare porous polyacrylamide hydrogels using a solution method. During preparation, calcium carbonate is suspended in the reaction mixture; after the hydrogel takes shape (the reaction occurs at room temperature and takes four to five days), acid is used to dissolve the calcium carbonate, thereby creating pores.
Is your main purpose for using calcium carbonate to use it as a crystallization nucleus? If that’s the case, I think you can use some emulsions to replace calcium carbonate
In essence, it is to have calcium carbonate physically occupy certain spaces, so that acrylamide can only crosslink by going around these spaces. After the polyacrylamide hydrogel (similar to jelly) is formed, acid is used to dissolve this calcium carbonate. If an emulsion is to be chosen and it needs to be dissolved in the end, which emulsion would be suitable? Or, other substances can be used in suspension, or other methods can be employed, as long as they enable the hydrogel to form pores.
You can first treat calcium carbonate with sodium stearate, and then mix it with acrylamide
Nanocalcium carbonate can be tried; the particle size has a significant impact.
First, it is necessary to use relatively fine calcium carbonate; the filter cake of nano-calcium carbonate can be used, but it must be unmodified. Water is then added in the required proportions to prepare the mixture (it is better to use a slurry of nano-calcium carbonate for this purpose). For laboratory use, the material can be ground using a colloid mill, which ensures that no significant sedimentation of the nano-calcium carbonate occurs within two days； If it is for industrial use, it is better to use a high-speed disperser for dispersion. In principle, the above methods mainly aim to break apart the agglomerates of nano-calcium carbonate in order to reduce their particle size as much as possible.
Take a look at the articles on the activation and modification of calcium carbonate, focusing mainly on the activation temperature