Conclusions
The possibility of casting refractories from multichamotte slip with a maximum moisture content of 15% has been investigated; a preliminary treatment of the slip under vacuum is recommended as well as a brief vibration of the gypsum molds within a certain period after pouring.
The high rate of moisture loss and solidification of multichamotte slip castings allow production on an industrial scale.
Multichamotte kaolin mixtures yield castings up to 100 × 80 × 80 mm which acquire the following properties after firing at 1470° C: bulk density −2.17–2.26 g/cm3; porosity −12 to 18%; compressive strength −420 to 800 kg/cm2; loss on ignition −2. 7 to 4. 3; total shrinkage in relation to the size of gypsum molds −4 to 5%.
The casting process is of practical value for the manufacture of multichamotte products (including high-alumina refractories) since molding the latter by means of pressing is either impossible or extremely difficult.
Industrial tests are conducted for the verification and more accurate determination of technological parameters and the technical and economic effectiveness of the method.
Keywords
Shrinkage Compressive Strength Gypsum Bulk Density KaolinPreview
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