RAW AND FRITTED MIXTURES FOR GLAZES AND ENAMELS BASED ON KAOLINITE AND BORON MINERALS (HAULITE AND COLEMANITE)

摘要

The product of row and fritted mixtures for glazes and enamels is based on kaolinite from Pčinj region and borate mineral stones (haulite and colemanite) from Baljevac, on the river of Ibar, it is made completely from domestic mineral raw materials and can definitely substitute expensive imported frittes in all our factors for glazing ceramic and enameling metallic products and also can be exported abroad. Raw and fritted mixtures for glazes have the following approximate composition. Minerological composition: K and Na feldspar 17,7 %, calcite 8,9 %, boron minerals haulite, colemanite 26,4%, kaolinite 47,0 %; and chemical composition: raw SIO2 51,0 % and fritted 57,2 %, raw Al2O3,6 % and 13,0 %, raw CaO 11,2 % and fritted 12,5 %; raw B2O3 11,0 % and fritted 12,3 %, raw K2O 1,3 and fritted 1,4 %; raw Na2O 3,2 % and fritted 3,6 %, while the heating loss is 10,7 %.Raw and fritted mixture for enameling has the following approximate composition. Minerological composition: kaolinite 44,12 %, boron minerals 38,24 %, calcite 8,82 %, K and Na feldspar 8,82 %; and raw chemical composition SiO2 43,0 % and fritted 49,4 %, raw B2O3 16,0 % and fritted 18,4 %, raw CaO 14,0 % and fritted 16,1%, raw Al203 10,0 % and fritted 11,5 %, K2O 2,4 % and fritted 2,8 %, raw Na2O 1,6 % and fritted 1,8 %, and the heating loss is 13,0 %.