MIXTURE FOR PRODUCING COLOURED GLASS Russian patent published in 2012 - IPC C03C6/10 

FIELD: chemistry.

SUBSTANCE: invention relates to production of glass. The technical result of the invention is reducing the melting temperature of the glass. The mixture for producing coloured glass contains soda, quartz sand, a colouring additive - dry galvanic sludge and chalk, with the following ratio of components in wt %: soda - 7.0-11.0; quartz sand - 46.0-58.0; chalk - 3.0-5.0; galvanic sludge - 30.0-40.0. The galvanic sludge is characterised by the following average chemical composition in wt %: SiO₂ 10.78; Al₂O₃ 2.73; Fe₂O₃ 12.9; FeO 0.33; TiO₂ 0.21; Cr₂O₃ 1.08; NiO 0.46; CuO 7.09; ZnO 1.42; CaO 27.85; MgO 2.12; SO₃ 1.75; K₂O 0.88; Na₂O 2.18; LOI 28.21.

EFFECT: low melting temperature of the glass.

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