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Black ceramic pigments were prepared from industrial wastes as raw materials, namely, Cr/Ni-rich sludge generated from Cr/Ni plating and Fe-rich galvanizing sludge generated during steel wiredrawing. The pigment was based on the chrome–iron–nickel black spinel (Ni,Fe)(Fe,Cr) 2 O 4 catalogued as 13-50-9 in the DCMA classification and prepared by the common solid-state reaction method,...
The objective of the present work is to develop a procedure for obtaining and characterization active silica with a high specific surface area from rice husk ash. The relative amount of silica was increased after burning out the carbonaceous material at different times and temperatures. A 95% silica powder could be produced after heat-treating at 700 o C for 6 h. The specific surface area...
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