TY JOUR TI Substandard sand in the technology of glass materials for construction purposes KW raw materials KW substandard sand KW enrichment KW building glass JO Technique and technology of silicates AU Min’ko, N.I. AU Yakh’ya, M.. AU Kemenov, S.A. PY 2014 IS 21 PB Individual Entrepreneur Svetlana Vasilievna Samchenko