CHARGE FOR AVENTURINE GLASS MAKING Russian patent published in 1995 - IPC

FIELD: glass industry. SUBSTANCE: charge has, wt.-%: boric acid (H₃BO₃) 12.12-36.36; potassium bichromate (K₂Cr₂O₇) 4.24-11.09; lithium carbonate (Li₂CO₃) 12.73-18.74; lead oxide (PbO) 14.00-23.86, and silicic acid (SiO₂·nH₂O) -the rest. Charge has additionally, wt.-%: cobalt oxide (Co₃O₄) 0.29-2.39 and titanium oxide (TiO₂) 0.17-0.55, and sum of these components is 1.38-2.37; additionally - cobalt oxide 0.15-0.28 and copper oxide (CuO) 0.78-0.91, and their sum is 0.93-2.19; additionally - cobalt oxide 0.92-1.72 and copper sulfate (CuSO₄) 0.18-0.24, and their sum is 1.16-1.90; additionally - ferrochrome cupola slag 13.51-20.0. Charge components were mixed. Glass is founded at 1000-1050 C for 1-2 h, annealed at 450-470 C for 0.5 h. EFFECT: improved method of glass making. 6 cl, 2 tbl