Use of cobalt-containing oxide waste for synthesizing enamels

The high cost of enamel frits containing cobalt and nickel oxides can be reduced by replacing the oxides by cobalt- and nickel-containing waste such as spent oxide catalysts used in organic synthesis. It is shown that introduction of up to 7 wt% cobalt-containing oxide catalyst waste into the mixture used to synthesise acid-resistant one-coat enamel does not worsen its wettability. The content of cobalt in such an enamel amounts to 0.2-0.3 wt%, which is sufficient for its satisfactory cohesion with steel. 4 refs.