Hydrolysis of zinc chloride in aqueous ammoniacal ammonium chloride solutions

• Published in: Hydrometallurgy Vol. 38; no. 3; pp. 235 - 243
• Main Authors: Limpo, J.L., Luis, A., Cristina, M.C.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-08-1995; Elsevier
• Subjects: Chemistry; Exact sciences and technology; General and physical chemistry; Solubility; Solutions; Ammonium chloride; Hydrolysis; Ammonia; Temperature dependence; Zinc chloride; Concentration effect; Solubility; Aqueous solution; Experimental study; Zinc
• ISSN: 0304-386X; 1879-1158
• DOI: 10.1016/0304-386X(94)00075-E

Zinc solubility in the ZnCl
2NH
4ClNH
3H
2O system for chloride concentrations lower than 5
m in the temperature range 30–50°C was studied. The experimental results show that, for chloride concentrations between 3.5 and 5.0
m, the zinc solubility is determined by the solubility of the zinc diammine chloride. For chloride concentrations lower than 3.0
m, there are two zinc compounds, the hydroxide Zn (OH)
2 and the hydroxychloride Zn(OH)
1.6Cl
0.4, on which the solubility of zinc depends, according to the value of the ratio [NH
3]
Total/[Zn]
Total.