Abstract
The solubility of sodium chromate in sodium hydroxide solution at 15, 25, 35, and 45C, and in methano1 so1ution at 25 apd 35C, was determined in connection with the separation process of sodium chromate from thereaction product of chromite with o1tesodium salt.In the Na2CrO4-NaOH-H20 system, it has been found that the solubility of sodium chromate decreased a1ong a curve with several infiections with the increase of sodium hydroxide concentration Solid phases were Na2CrO4-10 H20, Na2CrO4-4 H30, Na2CrO4-11/2H20, Na3CrO4, NaCrO5-13H2O, and etc., but Na2CrOao10 H20 and Na4CrO6-13 H20 disappeared above 25C and above 35C respectively.In the Na2CrO4-NaOH-CH30H-H2O system, the solubility of sodium chromate in the methanol solution markedly decreased with the increase of methanol concentration in the methanol concentration above 50%.In the presence of 10-20% of 80diumhydroxide, the solubility of sodium chromate decreased to the extent of 1/4-1/10 as compared with the value obtained in the absence of sodium hydroxide. Solid phases were Na2CrO4-4H2O, Na2CrO4-11/2 H2O, and Na2CrO4.
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