Abstract
The solubility and phase diagram of Na+, NH4+ / / CrO42-, HCO3--H2O system are determined in this paper. According to the solubility and phase diagram, the solid phases in carbonation process of sodium chromate in ammonia solution are discussed. The results show that a crystalline zone of NaNH4CrO4 (.) 2H(2)O exists, NaHCO3, NaNH4CrO4 (.) 2H(2)O and (NH4)(2)CrO4 crystallize out in turn during carbonation process as the concentration of sodium chromate in ammonia water exceeds the concentration corresponding to P-2(P-2') in phase diagram. Proper concentration is 0.8633 similar to 1.1377 g/g H2O for sodium chromate, 0.0611 similar to 0.0986 g/g H2O for ammonia, lower than the concentration corresponding to P-2(P-2') plot. The NaHCO3 and NaNH4CrO4 (.) 2H(2)O crystals can be separated by hydrocyclone.
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