METHOD FOR UTILIZING ALUMOCHROMIC CATALYST WASTE Russian patent published in 2017 - IPC C04B33/132 

FIELD: construction.

SUBSTANCE: charge components are mixed by means of joint wet grinding in a ball mill, plastic moulding of the moistened mixture is carried out, followed by drying to the residual humidity of 4% and firing at the temperature rise of 1-2°C/min up to 1160°C and holding at the maximum temperature within 2-3 hours. The alumochrome catalyst waste has the bulk density of 1.3-1.5 g/cm³ and the composition, wt %: chromium in terms of Cr₂O₃ 0-25, Al₂O₃ (Gamma modification) 73-89, K₂O 1-2, SiO₂ 0-6, impurities of iron to 0.5-0.7, impurities of nickel, copper, zinc, titanium up to 0.2. In the charge, low-melting clay of the following chemical composition is used, wt %: SiO₂ 60-70, TiO₂ 0.5-1, Al₂O₃ 10-15, Fe₂O₃ 2-7, MnO 0.1-1, CaO 2-4, MgO 1-5, Na₂O 1-4, K₂O 2-5, P₂O₅ 0.1-0.5, SO₃ 0.09, LOI 6, 10.

EFFECT: increasing the strength and water resistance of construction ceramics due to the introduction of charge based on low-melting clay into the composition.

4 ex, 2 tbl, 1 dwg