Kaolin
Kaolin is also known as china clay. It is soft and white in the natural state and is used to manufacture porcelain pieces. This clay is named after Kao-ling hill in China from which it was mined for centuries. Made up of kaolinite mineral, this clay is mixed with 20-35% water to initiate its plastic properties. This mixture can easily be molded to give a variety of shapes which is retained once the pressure of mold is removed. It has very white burning characteristics which makes it suitable for whiteware manufacturing.
Physical Properties
Kaolin exhibits the following physical properties, which is why it is used in a variety of applications in the ceramic industry:
Very Bright Visually
Non-abrasive
Naturally fine particles
Refractory
Resistant to Heat & Electricity
Easily Disperses in Water
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Applications
The plasticity exhibited by kaolin along with its resistance to heat and electricity makes it a useful mineral for the following applications:
Paper Industry
Kaolin is used as a special paper coating which enhances the appearance of paper by making it look bright and smooth and also increases its printability.
Tableware
Kaolin continues to remain white even when heated at high temperatures and exhibits good fusion characteristics making it useful in creating tableware like dishes, cups and more.
Construction Industry
When mixed in the right proportion, Kaolin can boost several mechanical properties like porosity in concrete and cement.
Plastic & Rubber
Kaolin is extensively used as a filler with the objective of boosting the performance of adhesives, sealants, plastics and rubber.