Refractory crucibles made of calcium oxide are tested for resistance to molten copper, nickel, cobalt, and slag. A refractory based on CaO and a ceramic bond does not enter into chemical reaction with molten copper, nickel, and cobalt; however, it does react with impurities contained in it such as oxides of copper, nickel, and cobalt. Calcium oxide is shown to exert a refining effect on the molten metals.
Refractories and Industrial Ceramics – Springer Journals
Published: Oct 17, 2004
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