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. 2022 Oct 24;27(21):7196. doi: 10.3390/molecules27217196

Table 2.

Characteristics of bleaching earth.

P1 P2 P3 P4 P5 P6 P7
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Mineral Attapulgite clay Attapulgite clay Attapulgite clay Magnesian bentonite Magnesian bentonite Magnesian bentonite Kerolite-hydrated magnesium silicate
Modified Physically activated pH-modified Not modified Not modified Not modified Acid-modified Chemically modified
pH 8.0 3.2 8.0 8.5 10.0 6.5 6.0
Density (kg/m3) 0.41 0.51 0.47 0.60 0.60 0.60 0.55
Composition (%)
SiO2 55–60 58.8 56.1 63.1 53.5
Al2O3 2.5 5.3 5.7 8.3 4.0
Fe2O3 12–14 1.4 1.6 1.9 1.5
MgO 18–21 23.0 23.6 23.0 30.5
CaO 0.5–1.0 2.1 2.7 2.6 0.7
Na2O 0.05–0.25 - - - 0.3