CASTABLE REFRACTORY COMPOSITIONS FOR INTERIOR MATERIAL OF TUYERE STOCK OF BLAST FURNACE

摘要

PURPOSE: Castable refractory compositions obtained by using mullite as aggregate of castable refractory and forming a dense texture resistant to corrosion using high purity alumina at a combining site are provided, which have excellent heat insulation property and corrosion resistance. CONSTITUTION: These compositions comprise a)40 to 60% by weight of mullite having a particle size of 3 to 10mm, b)30 to 45% by weight of mullite having a particle size of 0.5 to 3mm, c)3 to 10% by weight of alumina fine powder, d)2 to 5% by weight of silica fine powder, e)3 to 7% by weight of alumina cement, 0.3 to 0.9 parts by weight of vinyl fiber having a length of 1 to 10mm based on 100 parts by weight of the component a) to b) and g)0.05 to 0.5 parts by weight of sodium phosphate based on 100 parts by weight of the component a) to b).