Kaolin Product Specification Sheet
CLAY NKPL GP1
Description: A dry milled kaolin, (china clay) of good white colour. Typically used for the manufacture of whiteware ceramics, manufacture of paints, or as a filler where a white colour is required.
Specifications: Typical chemical and physical properties:
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Commercial Kaolin currently marketed in NSW
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NKPL GP1¹
(%)
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HR1/F²
(%)
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Q38³
(%)
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Q145³
(%)
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Silica
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SiO2
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50.7
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48.4
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50.3
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49.3
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Alumina
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Al2O3
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35.1
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33.4
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34.3
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33.8
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Magnesia
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MgO
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0.15
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0.2
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0.3
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0.4
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Potash
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K2O
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0.72
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0.2
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1.1
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2.4
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Soda
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Na2O
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0.10
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0.2
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0.2
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0.1
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Lime
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CaO
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0.04
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0.1
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0.1
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0.1
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Ferric Oxide
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Fe2O3
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0.34
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1.3
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0.9
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0.8
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Titania
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TiO2
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0.26
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2.5
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1.5
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1.5
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Loss of ignition
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(1000°C)
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12.49
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12.8
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12.0
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10.9
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Mineralogy (NKPL GP1):
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Quartz
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-
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9.4%
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Kaolinite
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-
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83.0%
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Mica
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-
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6.1%
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Brightness - R457nm:
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NKPL GP1
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-
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77
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HR1/F
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-
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71
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Q38
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-
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72
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Q145
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-
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72
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Calcined Brightness (NKPL GP1):
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1,000°C
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76
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1,100°C
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-
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85
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1,200°C
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-
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93
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Pyrometric Cone Equivalent (PCE):
Typical partical size distribution (determined by Kmetoni (1985) for NKPL GP1)
Notes:
¹ NKPL GP1 sample from Rocla tailings dam: -20μm, non-magnetic, split after separation (Kmetoni, 1985).
² HR1/F - Home Rule 1, from Gulgong.
³ Q38, Q145 - from Gulgong.
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