C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/119
C22B 34/32 (2006.01) C01F 7/14 (2006.01) C01G 37/14 (2006.01)
Patent
CA 1038629
INVENTION: ALUMINA REMOVAL FROM CHROMATE LEACH LIQUORS INVENTORS: DOUGLAS G. FRICK, THOMAS R. MORGAN, TERRY L. STREETER ABSTRACT OF THE DISCLOSURE This invention relates to an improvement in the method for removing dissolved acuminate from alkaline chromate leach liquor by acidification of the leach liquor to precipitate alumina hydrate which comprises, in combination, passing the leach liquor sequentially through a series of at least two agitated vessels, maintaining the liquor at a temperature of at least about 90°C., and adding acidifying agent to said vessels in amount sufficient to establish gradually decreasing pH levels in the liquor from vessel to vessel in the direction of liquor flow such that the pH in the vessel through which the liquor passes first is maintained within the range of from 10 to 13.5, and the pH in the vessel through which the liquor passes last is maintained within the range of from 6 to 9.5, so that the precipi- tated alumina hydrate comprises predominantly alumina trihydrate in easily filterable form.
228132
Frick Douglas G.
Morgan Thomas R.
Streeter Terry L.
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