Calcium carbonate coating often refers to coating ground calcium carbonate powder with stearic acid to change the property of GCC powder. Stearic acid is water soluble, and will react with calcium carbonate particles to form a surface coating of calcium stearate. As a professional player in mineral processing areas, Daswell provides a high effective coating system for making coated calcium carbonate. The calcium carbonate coating plant can produce very uniform stearic acid coated calcium carbonate with low cost and low energy consumption.
Daswell establishes itself as a professional provider of calcium carbonate coating machine. In fact, we provide whole set of equipment for manufacturing coated calcium carbonate plant. A set of calcium carbonate coating machinery includes feeding device, screw mixer, coating machine, classifier, blowers, conveying devices, storage silos and so on. The classifier is often in a circuit with the coating machine to control particle sizes of coated calcium carbonate. Our coating system with classifier can make best use of the stearic acid and GCC powder to produce high quality coated calcium carbonate efficiently.
The calcium carbonate coating plant is often work side by side with calcium carbonate plant. For the coated calcium carbonate can add vaule of natural calcium carbonate powder produced by your calcium carbonate plant. Here the detailed explanation of the process for coating calcium carbonate powder. Firstly, the calcium carbonate powder from ball mill is transferred to the material silo by bucket elevator. Then controlled amount of GCC powder and stearic acid is mixed in screw mixer. And the blower will blow the mixture into the calcium carbonate coating machine. Since the coating machine is equipped with high speed vortex, the mixture in the coating machine will be blend and pulverized so that the coating can be uniform. Then with the flow of air, the mixture will go into classifier, in which the coated calcium carbonate is further cut in sizes. The desired coated calcium carbonate will go to product silo after going through the dust collector. While the coarse coated calcium carbonate will be rejected and go into the coating machine again for anther round of coating process. As a result, Daswell calcium carbonate coating plant can produce controlled sizes of coated calcium carbonate with high whiteness and consistency.
Natural calcium carbonate powder is often obtained by grinding calcium carbonate rich rocks such as limestone or marble. Coated calcium carbonate is to modify the surface of calcium carbonate powder with various acid, in which stearic acid is often used. Coated calcium carbonate is widely used as white filler in various products, notably plastic pipes. The stearic acid coating enhances the mixing and binding with the plastic and can also served as smoothing and lubricating agent that reduce wear. In this way, it can be said that coated calcium carbonate is value added version of natural calcium carbonate powder.
The coating system in Daswell can produce surface treated calcium carbonate in different micron grades according to different sectors, such as plastic, paint, paper, PVC and plastic pipe and so on. Besides, coated calcium carbonate is also often used for doing steel and iron smelting.
To build a tailored calcium carbonate coating plant, you have several factors to consider. Here are some instances: the particle sizes of ground calcium carbonate powder, required thickness of the coating, production capacity of coated calcium carbonate, intended use for coated calcium carbonate, the medical purity of final product, and allowed residuals of other material in the coating. All these factors can have great impact on the design of your calcium carbonate coating plant and on the quality of final product. And according to these specific needs, Daswell will offer system solutions for coated calcium carbonate production.