Description
Kaolin
Kaolin and kaolin clays are clay rocks in which kaolinite is the predominant mineral phase. In addition, we can associate it with other minerals in variable proportions, directly influencing the properties of this clay, such as illite (flux), smectite (improves plasticity) or alumina hydrates (improves refractoriness) .
Other names: In English, it is also called “China Clay”.
Use
Accordingly, we use kaolin to enable the refined form of ceramic art, we mainly use it in the paper industry as a filler in the paper mass and as a surface coating. Finally, it is found in many areas:
papermaking,
ceramic,
fiberglass,
refractory,
admixtures for concrete
pharmaceutical and cosmetic use,
animal feed
sealant for rubber, paint, plastic
It makes it possible to reduce the amount of paper pulp, which is quite expensive, and improves the optical properties. Additionally, its whiteness increases the gloss and opacity of the paper surface, while the size and shape of the individual kaolin particles provide the gloss and print quality required for certain types of paper.
Rubber industry.
In addition, we use kaolin in the formulation of rubber compounds to improve abrasion resistance and mechanical strength. Besides, its whiteness makes it possible to obtain a clear base which can be colored by adding a pigment.
In medicine: We use kaolin as an activator to test plasma coagulability in certain biological tests (activated partial thromboplastin time).
Ingestion: It is also used as an antidiarrhoeal.
In the Middle East and Africa, kaolin is traditionally consumed, especially by pregnant women, probably due to deficiencies (especially zinc). This geophagy can lead to addiction and health issues such as anemia, constipation, and kidney problems.
In paint: we find it in many formulations of conventional or environmentally friendly paints and it also serves as the main filler for so-called “clay” paints.
Building: Kaolin can be used as a component in the manufacture of geopolymer cements.
Agriculture: Kaolin is a foliar product and we use it against sunburn in citrus orchards, also, the product has a repellent effect against certain harmful insects, as part of the biological control.
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