CHROMOUS CALCIUM HEXAALUMINATE-BASED REFRACTORY AGGREGATE AND PRODUCTION METHOD THEREOF

摘要

FIELD: chemistry. ^ SUBSTANCE: group of inventions relates to refractory industry, specifically to a refractory aggregate based on chromous calcium hexaaluminate and a method of producing said aggregate from high-alumina slag from aluminothermic production of chromium metal. The said refractory aggregate can be used in production of unmoulded refractories and refractory articles meant for lining thermal generating units in various industries. The chromous calcium hexaaluminate-based aggregate contains the following mineral phases in wt %: chromous calcium hexaaluminate CaO6(Al,Cr)2O3 86.0-94.0, chromous corundum (Al, Cr)2O3 1.5-10.0, Mg(Al,Cr)2O4 spinel 2.0-4.0, calcium dialuminate CaO-Al2O3 0.1-0.5. Method of producing the chromous calcium hexaaluminate-based refractory aggregate involves processing high-alumina slag from aluminothermic production of chromium metal through further roasting at 1500-1750C and crushing it to given grain composition. ^ EFFECT: volume constancy of the aggregate at temperatures higher than 1400C, which enables its use at higher temperature. ^ 2 cl, 1 ex, 2 tbl