the material has high thermal conductibilite refractories temperature variations and fluctuations of the atmosphere, the materials and manufacturing process

摘要

for sterile blocks, resistant to sudden temp. changes and useful for regenerative chambers and screens for glass-melting- and Siemens-Martin furnaces, are produced by using forsterite slag obtd. in carbothermal ferrochrome prepn., processed by breaking up and magnetic separation and contg. 3% Fe2O3, as raw material; shaping to blocks together with 1-50 (3-35)% sinter magnesia, with addn. of 2-6 (3-4)% standard b inders, drying and opt. f iring at 1460-1600 (1540) degrees C. Addn. of 2-30 (10-20)% Cr ore further improves sudden temp. change resistance of blocks.