Continuous procedure to precipitate oxy-hydroxide of pure cinc, from lejias de cinc. (Machine-translation by Google Translate, not legally binding)

摘要

Continuous process for precipitating pure zinc oxyhydroxide from zinc bleaches, characterized in that the zinc ions in solution are reacted with ammonia to form the ammoniacal zinc complex, which then decomposes on heating, precipitating oxidation zinc hydroxide and releasing ammonia, at the same time that in the solution is left ammonium salt whose ammonia is also immediately displaced by reaction with pre-heated lime slurry, performing all the operations in a single column, so that even the pre-heating of the slurry of lime is made in the lower part of it, which is achieved simultaneously cooling the suspension of oxyhydroxide, whose precipitate is, finally, separated by filtration and washed with water, at the output of that. (Machine-translation by Google Translate, not legally binding)