Brown spinel pigments based on zinc chromite, method of ...
Powder mixtures of the initial substances and compositions indicated in table 1--data in % by weight relative to the powder mixture--are homogenized in a ball mill for 20 minutes. The mixtures are brought to reaction in open fireclay crucibles in an electrochamber kiln. The firing temperature is 1300° C and the firing time 3 hours.
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