The influence of ortho-phosphoric acid and kaolin on the properties of unburnt refractory material
DOI:
https://doi.org/10.15587/2312-8372.2015.47001Keywords:
unburnt refractories, phosphate binder, kaolin, mullite-corundum products shardsAbstract
This thesis investigates the development of a composition of unburnt refractories based on shards of high-alumina refractory products and sintered corundum, kaolin and ortho-phosphoric acid. The experiment was carried out to determine physical and mechanical properties of the developed compositions. The analyzed results show that 7-9 % ortho-phosphoric acid content allows to receive the best properties specimen. It was also identified that the quantity of ortho-phosphoric acid influences the physical and mechanical properties of high-alumina samples both after heat treatment and after hard firing. In addition the experiment shows that the interaction of kaolin and ortho-phosphoric acid leads to the formation of combinations, which provide high mechanical strength to the obtained refractory material. The use of the ortho-phosphoric acid for such products manufacturing significantly simplifies the manufacturing technology of refractory materials, excludes their hard firing, cuts process losses and reduces finished material costs. The paper shows the perspective for production of the unburnt mullite-corundum refractories with improved operational properties based on the shards of mullite-corundum products, sintered corundum, kaolin as a clay bond and ortho-phosphoric acid as a phosphate binder.
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