Fireproof Concrete Masses for Lining in Foundry

摘要

Today, in Russia, carbide - silicon and aluminate - silicate packing masses are generally used for lining blast - furnace chutes. They contain refractory clay, coal-tar pitch and resins as binders which emit carcinogenic substance dangerous for a human organism. Thirty compositions of chute concrete masses excluding any carcinogenic substance were studied and tested on a chute by the Siberian State University of Industry in conjunction with the Kuznetsk Metallurgical Combine company. The best results were obtained with the following composition: 75 percent fused electrocorundum, 20 percent refractory clay, 5 percent high-alumina cement and 7.3 percent water (above 100 percent). Thermal resistance in heat changes was above 25 cycles at 800 deg C, apparent density was 2.54 to 2.75 g/cm~3, compressive strength was 76.6 and 79.2 MPa at 110 deg C and 1450 deg C, respectively, slag resistance was 0.1 to 0.2 mm at 1450 deg C, firing shrinkage was 0.2 percent with no corrosion observed. The composition developed increased the service life by 10 times compared with the composition generally applied and does not emit any carcinogenic matters. However, in view of the economic crisis and high cost of the electrocorundum, its application is limited.