The use of technogenic raw materials in high-alumina chamotte production

Abstract

The aim of this project is to develop the mass composition and the technology for producing high-alumina chamotte with an Al2O3 content of 65-85% based on technogenic raw materials - fine corundum dust formed during grinding of fused corundum. Finely dispersed corundum powder contains 93-95% Al2O3 is a by-product and can be used to obtain high-alumina chamotte. The parameters of high-alumina chamotte molding were determined. For the composition of the masses with Al2O3 content of 65% the molding moisture is 5-7%, with a pressing pressure of 15-20 MPa; with Al2O3 content 75% - moisture is 5-7%, pressing pressure is 10 MPa; with Al2O3 content 85% - moisture is 9%, pressing pressure is 15-20 MPa. Water absorption of chamotte after firing at 1700°C is 12-15%. The phase composition of chamotte with Al2O3 content: 65% - corundum (35-38%), mullite (46-50%), thialite (up to 4%), cristobalite (6-8%); 75% - corundum (43-50%) mullite (45-47%), thialite (up to 4%); 85% - corundum (68-71%), mullite (24-27%). © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (https://creativecommons.org/licenses/by/4.0/).