Showing papers on "Chromium(III) oxide published in 1971"

Production of chromium (iii) oxide of low sulfur content

Abstract: Chromium (III) oxide is prepared by contacting a finely divided alkali metal chromate with hydrogen at a temperature of about 900* to 1,600* C. The reaction product is cooled with liquid to produce a dispersion of Cr2O3 in water. If the dispersion is kept alkaline the Cr2O3 when separated contains less than 0.005 percent of sulfur. The initial chromate should be finely divided, e.g., less than 500 Mu or dissolved, and an acid-forming gas such as chlorine or hydrogen chloride can also be included to form a salt with the by-product alkali metal oxide.