TY JOUR TI PROBLEMS AND PROSPECTS OF USING OF ALUMINATE CEMENTS TO PRODUCE UNMOLDED REFRACTORIES KW unmolded refractories KW aluminate cements KW high alumina cement KW strength KW refractoriness KW refractory additives KW zirconium compounds JO Technique and technology of silicates AU Krivoborodova, S.Y. AU Korshunov, A.V. PY 2024 IS 31 PB Individual Entrepreneur Svetlana Vasilievna Samchenko