CHARGE TO PRODUCE MAIN REFRACTORY MATERIALS Russian patent published in 1995 - IPC

FIELD: refractory materials production. SUBSTANCE: charge has, mass % : melted periclase fractions ≅ 0.06 mm 5 - 25, melted chromoalumina spinellide fractions 3 - 1 mm 15 - 35; sintered periclasechromite fraction 1 - 0 mm 15 - 25, sintered periclasechromite fraction 3 - 1 mm 35 - 45. In the case charge has sintered periclasechromite with chrome oxide share of Cr₂O₃ 12 - 22 mass % and silicon dioxide SiO₂ of no more than 2 mass %. Charge has chromoalumina spinellide with aluminum oxide Al₂O₃ share 11 - 17, chrome oxide Cr₂O₃ 8 - 15 %. Specification: open porosity 16 -19 %, 8 - 25 mcm grade pores share 19 - 32 %, strength limit under temperature of 1600 C 7.7 - 9.4 MPa. EFFECT: charge is used to produce main refractory materials. 3 cl, 1 tbl