This ratio for whole rockkaolinfrom CentralAfricaranged between 1 and 3.8, 1–7 for EastAfrica, 1–3.5 for NorthAfrica, 1–3.1 for SouthernAfricaand 1–5.1 for WestAfrica. In most industrial applications ofkaolin, it is desirable for the mineral to have a chemical composition, which is comparatively closer to its theoretical value.
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