Kaolin Al2O32SiO22H2O

Kaolin, also called china clay, soft white clay that is an essential ingredient in the manufacture of china and porcelain and is widely used in the making of paper, rubber, paint, and many other products.

In its natural state kaolin is a white, soft powder consisting principally of the mineral kaolinite, which, under the electron microscope, is seen to consist of roughly hexagonal, platy crystals ranging in size from about 0.1 micro meter to 10 micro meters or even larger.

These crystals may take vermicular and book like forms, and occasionally macroscopic forms approaching millimeter size are found. Kaolin as found in nature usually contains varying amounts of other minerals such as muscovite, quartz, feldspar, and anisate. In addition, crude kaolin is frequently stained yellow by iron hydroxide pigments.

It is often necessary to bleach the clay chemically to remove the iron pigment and to wash it with water to remove the other minerals in order to prepare kaolin for commercial use. When kaolin is mixed with water in the range of 20 to 35 percent, it becomes plastic (i.e., it can be molded under pressure), and the shape is retained after the pressure is removed. With larger percentages of water, the kaolin forms a slurry, or watery suspension.

Element  Result  range %
Na2O 0.0454
MgO 0.0524
Al2O3 30- 34
SiO2 41.40
P2O5 0.105
SO3 0.0273
K2O 0.0291
CaO 0.1618
TiO2 2.843
Cr2O3 0.0232
Fe2O3 1.180
NiO 0.0070
CuO 0.0051
ZnO 0.0103
Ga2O2 0.0070
SrO 0.0073
Y2O3 0.0145
ZrO2 0.1548
Nb2O5 0.0225
PbO 0.0028
ThO2 0.0034
LOI-CHO 16.9069
S-BLEND 0.0500
pH 6.00 – 8.00
Whiteness 81.82
Density 1.502
Liquefaction 0.3
Viscosity by Leman, sec (d=4.0 мм) Not more than 35
Thixotropy, °Г (degrees of Gallenkamp) From 0 to 20
Casting rate (after 30 min), мм no less 5,5
Loss on ignition, % no less 13,0

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