C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/201
C01F 7/66 (2006.01)
Patent
CA 1154231
-2- Basic Aluminum Nitrate Crystallization Abstract of the Disclosure There is described a process for preparing large crystals of basic aluminum nitrate (BAN) from a nitric acid feed solution containing Al2O3 values comprising the steps of: (1) evaporating water and nitric acid from the solution in a single step evaporation performed at a temperature of between about 270 and about 450°F and at a pressure of between about atmospheric and about 60 psig to produce an evaporated liquor comprising at least about 16% alumina by weight; (2) holding the evaporated liquor in a quiescent state for a period of between about 20 minutes and about two hours within the temperature range of about 270°F to about 350°F; (3) injecting water into the product of step 2, the water being added in an amount sufficient to adjust the composition of the conditioned liquor to a composition expressible as the sum of two components -- (1) ANN (Al2O3.6HNO3.15H2O or Al(NO3)3.9H2O), and (2) The desired crystal product BAN or Wiseite (a) BAN (Al2O3.2HNO3.5H2O or Al(OH)2NO3.2.OH2O). or (b) Wiseite (Al2O3.2HNO3.4H2O or Al(OH)2NO3.1.5H2O) to precipitate large crystals of BAN; and (4) separating the large crystals.
355781
Dewey. John L.
Scott Charles E.
Reynolds Metals Company
Ridout & Maybee Llp
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